ECE 484 Semiconductor Lasers
|
|
- Elaine Tyler
- 5 years ago
- Views:
Transcription
1 ECE 484 Semiconductor Lasers Dr. Lukas Chrostowski Department of Electrical and Computer Engineering University of British Columbia January, 2013 Module Learning Objectives: Understand the importance of the in lasers Calculate the Fabry-Perot transmission and reflection spectrum Determine the Fabry-Perot modes Calculate the Fabry-Perot laser threshold Readings: Yariv Sections , 4.1, (6.1) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 1
2 Introduction to Semiconductor Lasers A diagram of a semiconductor laser: Injection current (PUMP) Partially reflective surface (CAVITY) Partially reflective surface (CAVITY) ~0.1µm Laser output (infrared) Active layer (e.g. GaAs) (GAIN MEDIUM) Ohmic contacts Confining layers (e.g. AlGaAs) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 2
3 Wave Equation Starting from Maxwell s equations, the wave equation for the electric field vector, E, in a homogeneous and isotropic media is: 2 E µɛ 2 t 2 E = 0 The solution is a monochromatic electromagnetic plane wave E = E oue i(ωt k r) A is the amplitude of the wave. ω is the frequency. k is the wavevector with a propagation constant k = k ; u is perpendicular to the direction of propagation. The magnitude of the wavevector is β = k = ω µɛ The phase velocity is: ν = ω k = 1 µɛ = 1 n µ 0ɛ 0 where n is the index of refraction. The wavelength in the material is: λ = 2π k Readings: Yariv Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 3
4 Energy of an Electromagnetic Wave The time-averaged energy flux (Poynting s theorem) is S = 1 2η E0 2 u 3 = k 2ωµ E 2 The time-averaged energy density is U = 1 2 ɛ E0 2 = 1 2 ɛ E 2 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 4
5 Reflections at Dielectric Interfaces Consider the plane wave E, normally incident on a dielectric interface: E re n 1 n 2 te The reflection coefficient, r, is r 12 = n1 n2 n 1 + n 2 Note that if light was originating in the n 2 medium, the reflection coefficient would be of opposite sign, i.e. r 21 = r 12. The power reflection coefficient is R = r 2. The power transmission coefficient is T = t 12t 21. Conservation of energy tells us that T + R = 1 The transmission coefficient, t, is t 12 = 2n1 n 1 + n 2 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 5
6 Reflections at Dielectric Interfaces Example What is the power reflection coefficient for a field inside a semiconductor laser (n = 3.6), incident on an air interface (n = 1)? Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 6
7 Fabry-Perot model The Fabry-perot etalon is the most basic optical resonator. It consists of a plane-parallel plate of thickness l and index n that is immersed in a medium of index n. r = reflection coefficient for waves from n toward n. r = reflection coefficient for waves from n toward n. t, t = transmission coefficients Assume normal incidence, θ = 0 Round-trip phase shift: δ = k = 2π n 2l λ M.H. Ayliffe/D.V. Plant E i tt e i δ 2 E i tr 2 t e i δ 2 e iδ Example For a thickness l = 300nm, with n = 1, at what wavelength do we see constructive interference at the output? Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 7
8 Fabry-Perot Model - Multiple Beam Interference UBC ECE Lasers Light is incident from the top, E i, transmitted through bottom, E t. E i tt e i δ 2 E i tr 2 t e i δ 2 e iδ E i tr 4 t e i δ 2 e i2δ E i tr 6 t e i δ 2 e i3δ We can express the transmitted field as: E t = E i tt e i δ 2 +Ei tt (r ) 2 e iδ e i δ 2 +Ei tt (r ) 4 e i2δ e i δ 2 +Ei tt (r ) 6 e i3δ e i δ M.H. Ayliffe/D.V. Plant Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 8
9 Fabry-Perot Model - Multiple Beam Interference The transmitted field, E t, simplifies to: E t =E i tt e iδ/2 [ 1 + (r ) 2 e iδ + (r ) 4 e i2δ +... ] [ tt e iδ/2 ] =E i 1 (r ) 2 e iδ (infinite geometric series) [ ] T e iδ/2 =E i 1 Re iδ The normalized transmission is: E t = T eiδ/2 E i 1 Re iδ And the power transmitted (light intensity): I t I i = E te t E i E i = T 2 (1 Re iδ )(1 Re iδ ) = (1 R) 2 (1 R) 2 + 4R sin 2 (δ/2) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 9
10 Fabry-Perot Model - Multiple Beam Interference When sin 2 (δ/2) = 0 I t /I i = 1 (i.e. all of the light is transmitted no reflection). Since sin 2 (δ/2) is periodic, there are many solutions which yield 100% transmission. These wavelengths are the Fabry-Perot modes, or Fabry-Perot resonant frequencies. This occurs for sin 2 (δ/2) = 0 δ/2 = mπ = 2πnl, (m = 1, 2, 3...) λ m The solutions are λ m, or in frequency, ν m = c = m c λ m 2nl As we will see later laser will oscillate at one of these wavelengths Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 10
11 Fabry-Perot Model - Transmission, Free Spectral Range Transmission δ / 2π The free spectral range (FSR) is the spacing between adjacent modes of the filter, and is: (R=0.3) ν = ν m ν m 1 = c 2nl Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 11
12 Fabry-Perot Model - Transmission, Linewidth 1 Transmission λ 1/ Wavelength [um] The linewidth ( λ 1 ) of the resonator is defined as the full-width 2 half-max (FWHM) of the transmission spectrum: (R=0.6) λ 1 2 = λ 2 λ 1 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 13
13 Fabry-Perot Model - Transmission Transmission R=0 R=0.3 R=0.7 R= δ / 2π The linewidth of the resonator changes with the reflection coefficient A larger reflection leads to a narrower linewidth Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 14
14 Fabry-Perot Model - Reflection UBC ECE Lasers Light is incident from the top, E i, reflected from the top, E r. E i tt e i δ 2 E i tr 2 t e i δ 2 e iδ E i tr 4 t e i δ 2 e i2δ E i tr 6 t e i δ 2 e i3δ We can express the reflected field as: E r = E i r + E i tt r e iδ + E i tt (r ) 3 e i2δ + E i tt (r ) 5 e i3δ +... M.H. Ayliffe/D.V. Plant Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 15
15 Fabry-Perot Model - Reflection The reflected field, E r, simplifies to: E r =E i r + E i tt r e iδ [ 1 + (r ) 2 e iδ + (r ) 4 e i2δ +... ] [ =E i r + tt r e iδ ] 1 (r ) 2 e iδ (infinite geometric series) [ =E i r T ] reiδ 1 Re iδ, r = r The normalized reflection is: E r = r T reiδ E i 1 Re iδ = r(1 eiδ ) 1 Re iδ And the power reflected (light intensity): I r I i = E re r E i E i = 4R sin 2 (δ/2) (1 R) 2 + 4R sin 2 (δ/2) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 16
16 Fabry-Perot Model - Reflection Transmission δ / 2π Transmission and reflection spectra are related (in this case, the resonator is lossless). Question: Sketch the reflection spectrum, for R = 0.6. Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 17
17 Fabry-Perot Model - with Loss If we consider loss in the cavity, where the per-pass intensity gain (or loss) is A = a 2 = e αl and the per-pass field amplitude gain (or loss) is a = e α 2 l The transmitted field, E t, becomes: E t =E i tt ae iδ/2 [ 1 + (ar ) 2 e iδ + (ar ) 4 e i2δ +... ] [ tt ae iδ/2 ] =E i 1 (ar ) 2 e iδ (infinite geometric series) [ ] T ae iδ/2 =E i 1 RAe iδ The normalized power transmitted (light intensity) is: I t I i = E te t E i E i = (1 R) 2 A (1 AR) 2 + 4AR sin 2 (δ/2) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 19
18 Fabry-Perot Model - with Loss Transmission δ 1/2 δ 1/2 A=1 A=0.9 A=0.5 A=0.1 δ δ 0 1/2 1/ δ / 2π Transmission spectrum amplitude decreases with increasing losses. Linewidth broadens. R=0.8 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 20
19 Fabry-Perot Model - with Loss Transmission, Reflection δ / 2π Reflection spectrum dip decreases with increasing losses. R=0.8 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 21
20 Fabry-Perot - Linewidth The full-width half-max linewidth is found by finding the half-power point, δ 1 2 : T (δ 1 2 ) = 1 2 T (0) (1 R) 2 A (1 AR) 2 + 4AR sin 2 ( δ ) The FWHM is: δ 1 = 2δ AR 1 = AR since: δ = 2π ωn2l n2l = λ c ω 1 2 = 21 AR AR = 1 (1 R) 2 A 2 (1 AR) 2 1 AR δ 1 = 2 sin AR 1 AR AR c 2nl, ν 1 = 1 AR 2 π c AR 2nl Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 22
21 Fabry-Perot Model - Finesse The finesse (F) of a resonator is defined as the ratio of the FSR to resonance linewidth: F = F SR λ 1 2 = c 2nl 1 AR π c AR 2nl = π AR 1 AR = ν ν 1 2 This is a measure of the sharpness of a resonance relative to the mode spacing. Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 23
22 Fabry-Perot Model - Q The resonator Quality factor, Q, is a measure of the sharpness of the filter relative to the central frequency, and defined as (E is stored energy): Q = ω E de/dt Note: This expression works very well to estimate Q from FDTD simulations. (Plot the intensity versus time.) For this, we need to calculate the total losses, both from the mirrors and propagation losses (absorption, scattering). Per-pass intensity loss = AR Distributed total loss, per unit length, α tot : A tot = AR = e αl R = e αtotl α tot = α 1 l ln R Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 24
23 Fabry-Perot Model - Photon Lifetime Total loss in cavity = Mirror loss + absorption, α tot = α m + α. The loss α tot [cm 1 ] describes the loss over distance, P (z) = P (0)e αtotz However, we would like to model the time behaviour of a resonator, dp dt = dp dz dz dt dp dz = α totp, dz dt = multiplying, get dp dt = α totp c n = P τ p = R loss where τ p = [ (α + α m ) c n] 1 is the photon lifetime (1 / Rate of photon decay = average time spent in the cavity) Q: Calculate the photon lifetime for α tot = 10cm 1, n = 3. Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 25 c n
24 Fabry-Perot Model - Q The decay of the energy in the cavity is: So Q is: Q is also defined as: de dt = E τ p Q = ω E de/dt = ωτ p Q = ω ω 1 2 The two definitions give equal results for small-enough losses, i.e. large Q values. This occurs when ln R 1 R R. The field decays to 1/e in time τ p. Thus, Q is the number of optical field oscillations before the field decays to 1/e. Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 26
25 Fabry-Perot Model - Physical Interpretations Finesse: F = π AR 1 AR This can be related to the total loss α via ln R. F π αl We can find the field decaying to 1/e when: 1 e = e 1 = e αl2n where N is the number of round trips in the resonator. αl2n = 1, π 2N = 1, F N = F 2π Hence, finesse/2π describes the average number of oscillations the field lives in the cavity. Ref: Optical Microresonators, F. Heebner, et. al., Springer Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 27
26 Ring Resonator Experiment Double-bus ring resonator with radius = 30µm, coupler length = 15µm, coupler spacing = 250nm. Optical microscope images from: Raha Vafaei, EECE 571U, 2009 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 28
27 Ring Resonator Experiment SEM images from: Nicolas Rouger, Raha Vafaei, EECE 571U, 2009 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 29
28 Ring Resonator Experiment 16 Double-bus ring resonator with radius = 30µm, coupler length = 15µm, coupler spacing = 250nm. Measured through port spectrum: Power v Wavelength for RR15 T=25C [d] 16 Power v Wavelength for RR15 T=25C [a] Power [dbm] Power [dbm] Wavelength [nm] Wavelength [nm] from: Raha Vafaei, Nadia Makan, EECE 571U, 2009 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 30
29 Q estimation techniques (double-bus RR) Q estimation techniques, for varied loss (α = 1 is loss-less): 0 Drop, Through Phase Linewidth, δ 1/2 10 δ 1/2 δ 1/ δ / 2π Theory (approx) Drop port, 3 db Through port, 3 db Resonator loss, α Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 31
30 Bragg Grating Fabry-Perot Experiment I Bragg gratings: design (top), electron microscope images (bottom). Fabricated via CMOS 193 nm lithography. Uniform Gratings!#$%&$ Phase-Shift!"#$%&$!"#$%&$ from: X.Wang, et. al, IEEE Photon. Conf., 2011, pp Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 32
31 Bragg Grating Fabry-Perot Experiment Bragg gratings: design (top), electron microscope images (bottom). Fabricated via CMOS 193 nm lithography. 0 5 Transmission (db) ~50 pm Wavelength (nm) from: X.Wang, et. al, IEEE Photon. Conf., 2011, pp Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 33
32 Fabry-Perot Applications Dichroic filters can design any spectral response; light is reflected rather than absorbed; long lifetime. 3D movies slightly different RGB filters for left/right eyes dolby-stakes-its-claim-in-3d-movie-tech htm Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 34
33 Fabry-Perot Laser A laser is constructed using a. For each pass in the cavity, the field is modified (phase and amplitude) by the factor r e ikl. Fabry-Perot Fabry-Perot Pump (Energy Source) r e ikl E t r e ik l E E i E i t E i E i t In the case of the laser, energy is provided, and modifies the propagation constant, k k. Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 35
34 Fabry-Perot Laser The propagation constant is modified by providing optical gain. k = k + k + i γ 2 iα 2 where k is the original propagation constant k is the change in propagation constant (due to active atoms) γ is the optical gain why factor of 1 α is the optical loss Note: All these parameters are wavelength dependant. Optical gain, γ(λ), is typically approximately a Gaussian function, with a bandwidth of 100nm in semiconductors. 2? Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 36
35 Fabry-Perot Laser Similar to an RF oscillator, a laser will begin to oscillate when the round-trip provides unity gain. From the diagram, the round trip gain is: (two reflections, and a path length of 2l) (r ) 2 e ik 2l =1 r 2 e i(k+ k+i γ 2 i α 2 )2l =1 r 2 e i(k+ k)2l e ( γ 2 α 2 )2l =1 The real part is: r 2 e ( γ 2 α 2 )2l = 1. This is the amplitude condition, where the field returns with the same amplitude after a round trip. The imaginary part is: e i(k+ k)2l = 0. This is the phase condition, where the field must return with the same phase (or a multiple of 2π). 2mπ = (k + k) 2l, (m = 1, 2, 3...) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 37
36 Laser Threshold The amplitude condition can be solved to provide the minimum gain required for the laser to operate. This is called the threshold gain, γ t. r 2 e ( γ 2 α 2 )2l =1, R = r 2 ( γ ln(r) + 2 α ) 2l =1 2 γ t =α 1 l ln(r) Thus, the laser will turn on only when the gain, γ o γ th E-Field Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 38
37 Laser Threshold Example What is the threshold gain for the following laser? index of refraction of gain region, n = 3.5 length, l = 200µm loss, α = 0. Active region (with! and ") Output beam Cleaved facet (R1=33%) SIDE VIEW Cleaved facet (R2=33%) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 39
38 Summary The optical cavity (e.g. Fabry-Perot) is important for lasers because: The cavity modes determine the possible lasing wavelengths The cavity losses (mirror loss, internal losses) determine the laser threshold Other laser optical cavities are possible Ring resonators (waveguides, optical fiber ring laser) Photonic crystals a a ARTICLES b 1 µm Nature Physics 2, (2006) Intensity (a.u.) Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers λ (nm) 40 Intensity (a.u.) λ (nm)
39 in SOI waveguides n eff Material dispersion is usually the dominant component of the total dispersion in a waveguide, and usually small (e.g. in SiO 2, n varies by less than 1% in the range of λ = 1µm 2µm) However, because of the high index contrast and the small geometries in the SOI waveguides, waveguide dispersion is very significant, and the effective index variation is important for modelling SOI devices (n eff is the effective index seen by the optical mode). Effective Index width=375 nm width=450 nm width=510 nm width=540 nm width=570 nm width=600 nm Wavelength (nm) Ref: Robi Boeck, Simulation and Fabrication of Microring Add-Drop Filters, EECE 571U 2009 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 41
40 Fabry-Perot with FSR ν The free spectral range (FSR), ω = ω 2 ω 1, is the spacing between adjacent modes of the filter, δ 2, δ 1 : 2π = δ 2 δ 1 = β 2 L β 1 L, β = n ω c Assume n varies linearly with ω, hence n = n 0 + ω dn 2 dω, where ω = ω 2 ω 1, n 0 = n(ω 0 ), ω 0 = ω2+ω1 2πc L = n 2ω 2 n 1 ω 1 = ω 2 ( ) dn = ω n 0 + ω 0 dω 2 ( n 0 + ω 2 ) ( dn ω 1 n 0 ω dω 2 2πc ω = L ( ) n + ω dn = 2πc Ln dω g c ν = L ( ) n + ν dn = c Ln dν g Use group index, n g, instead of n eff, for calculating FSR. ) dn dω Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 42
41 Fabry-Perot with FSR λ The free spectral range (FSR), λ, is the spacing between adjacent modes of the filter, δ m+1, δ m, and is found by: 2π = δ m+1 δ m = β m+1 L β m L β m+1 β m = β dβ dλ ( ) 1 dβ λ β = 2π ( dβ dλ L dλ β = 2πn λ, dβ dλ = 2π λ λ = λ, (Approx. that β varies linearly with λ) ) 1 dn dλ + 2πn( λ 2 ) = λ 2 L ( n λ dn dλ ν c λ λ 2 = c Ln g ) = λ2 Ln g Use group index, n g, instead of n eff, for calculating FSR. 2π ( λ 2 n dn ) dλ λ Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 43
42 in SOI waveguides n g n g can be found from experimental measurements or mode simulations of the effective index: n g = n eff λ dn eff dλ Using this expression on the n eff vs. λ data on slide 41, we obtain the group index, for different waveguide dimensions: Group Index Measured Modesolver: width=375 nm Modesolver: width=450 nm Modesolver: width=510 nm 2D FDTD: width=375 nm, gap=290 nm 2D FDTD: width=500 nm gap=165 nm Wavelength (nm) Ref: Robi Boeck, Simulation and Fabrication of Microring Add-Drop Filters, EECE 571U 2009 Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 44
43 Fabry-Perot with - Linewidth From slide 22, AR δ 1 = 21 2 AR We need to consider both frequency (wavelength) change and index change over the linewidth. since: δ = ω c 2nl dδ dω = 2l c ( n + ω dn dω So, δ 1 2 = 2l c n g ω 1 2 ω 1 2 = 21 AR AR ) = 2l c n g c 2n g l, ν 1 = 1 AR 2 π AR Use group index, n g, for calculating linewidth, Q, etc. c 2n g l Dr. Lukas Chrostowski ECE 484 Semiconductor Lasers 45
34. Even more Interference Effects
34. Even more Interference Effects The Fabry-Perot interferometer Thin-film interference Anti-reflection coatings Single- and multi-layer Advanced topic: Photonic crystals Natural and artificial periodic
More informationRefractive Index Measurement by Gain- or Loss-Induced Resonance
Refractive Index Measurement by Gain- or Loss-Induced Resonance 59 Refractive Index Measurement by Gain- or Loss-Induced Resonance Markus Miller Using a semiconductor optical resonator consisting of a
More information3.1 The Plane Mirror Resonator 3.2 The Spherical Mirror Resonator 3.3 Gaussian modes and resonance frequencies 3.4 The Unstable Resonator
Quantum Electronics Laser Physics Chapter 3 The Optical Resonator 3.1 The Plane Mirror Resonator 3. The Spherical Mirror Resonator 3.3 Gaussian modes and resonance frequencies 3.4 The Unstable Resonator
More informationLaser Basics. What happens when light (or photon) interact with a matter? Assume photon energy is compatible with energy transition levels.
What happens when light (or photon) interact with a matter? Assume photon energy is compatible with energy transition levels. Electron energy levels in an hydrogen atom n=5 n=4 - + n=3 n=2 13.6 = [ev]
More informationStimulated Emission Devices: LASERS
Stimulated Emission Devices: LASERS 1. Stimulated Emission and Photon Amplification E 2 E 2 E 2 hυ hυ hυ In hυ Out hυ E 1 E 1 E 1 (a) Absorption (b) Spontaneous emission (c) Stimulated emission The Principle
More information(b) Spontaneous emission. Absorption, spontaneous (random photon) emission and stimulated emission.
Lecture 10 Stimulated Emission Devices Lasers Stimulated emission and light amplification Einstein coefficients Optical fiber amplifiers Gas laser and He-Ne Laser The output spectrum of a gas laser Laser
More informationSummary of Beam Optics
Summary of Beam Optics Gaussian beams, waves with limited spatial extension perpendicular to propagation direction, Gaussian beam is solution of paraxial Helmholtz equation, Gaussian beam has parabolic
More informationEM waves and interference. Review of EM wave equation and plane waves Energy and intensity in EM waves Interference
EM waves and interference Review of EM wave equation and plane waves Energy and intensity in EM waves Interference Maxwell's Equations to wave eqn The induced polarization, P, contains the effect of the
More informationChapter 5. Semiconductor Laser
Chapter 5 Semiconductor Laser 5.0 Introduction Laser is an acronym for light amplification by stimulated emission of radiation. Albert Einstein in 1917 showed that the process of stimulated emission must
More informationSignal regeneration - optical amplifiers
Signal regeneration - optical amplifiers In any atom or solid, the state of the electrons can change by: 1) Stimulated absorption - in the presence of a light wave, a photon is absorbed, the electron is
More informationCHAPTER FIVE. Optical Resonators Containing Amplifying Media
CHAPTER FIVE Optical Resonators Containing Amplifying Media 5 Optical Resonators Containing Amplifying Media 5.1 Introduction In this chapter we shall combine what we have learned about optical frequency
More informationECE 240a - Notes on Spontaneous Emission within a Cavity
ECE 0a - Notes on Spontaneous Emission within a Cavity Introduction Many treatments of lasers treat the rate of spontaneous emission as specified by the time constant τ sp as a constant that is independent
More information4. Integrated Photonics. (or optoelectronics on a flatland)
4. Integrated Photonics (or optoelectronics on a flatland) 1 x Benefits of integration in Electronics: Are we experiencing a similar transformation in Photonics? Mach-Zehnder modulator made from Indium
More informationTunable metasurfaces via subwavelength phase shifters. with uniform amplitude
Tunable metasurfaces via subwavelength phase shifters with uniform amplitude Shane Colburn 1, Alan Zhan 2, and Arka Majumdar 1,2 1 Department of Electrical Engineering, University of Washington, Seattle.
More informationOptoelectronics ELEC-E3210
Optoelectronics ELEC-E3210 Lecture 3 Spring 2017 Semiconductor lasers I Outline 1 Introduction 2 The Fabry-Pérot laser 3 Transparency and threshold current 4 Heterostructure laser 5 Power output and linewidth
More informationLaser Types Two main types depending on time operation Continuous Wave (CW) Pulsed operation Pulsed is easier, CW more useful
What Makes a Laser Light Amplification by Stimulated Emission of Radiation Main Requirements of the Laser Laser Gain Medium (provides the light amplification) Optical Resonator Cavity (greatly increase
More informationCalculating Thin Film Stack Properties. Polarization Properties of Thin Films
Lecture 6: Thin Films Outline 1 Thin Films 2 Calculating Thin Film Stack Properties 3 Polarization Properties of Thin Films 4 Anti-Reflection Coatings 5 Interference Filters Christoph U. Keller, Utrecht
More informationElectromagnetic fields and waves
Electromagnetic fields and waves Maxwell s rainbow Outline Maxwell s equations Plane waves Pulses and group velocity Polarization of light Transmission and reflection at an interface Macroscopic Maxwell
More informationDesign of a Multi-Mode Interference Crossing Structure for Three Periodic Dielectric Waveguides
Progress In Electromagnetics Research Letters, Vol. 75, 47 52, 2018 Design of a Multi-Mode Interference Crossing Structure for Three Periodic Dielectric Waveguides Haibin Chen 1, Zhongjiao He 2,andWeiWang
More informationEE 472 Solutions to some chapter 4 problems
EE 472 Solutions to some chapter 4 problems 4.4. Erbium doped fiber amplifier An EDFA is pumped at 1480 nm. N1 and N2 are the concentrations of Er 3+ at the levels E 1 and E 2 respectively as shown in
More informationCalculating Thin Film Stack Properties
Lecture 5: Thin Films Outline 1 Thin Films 2 Calculating Thin Film Stack Properties 3 Fabry-Perot Tunable Filter 4 Anti-Reflection Coatings 5 Interference Filters Christoph U. Keller, Leiden University,
More informationStudy on Semiconductor Lasers of Circular Structures Fabricated by EB Lithography
Study on Semiconductor Lasers of Circular Structures Fabricated by EB Lithography Ashim Kumar Saha (D3) Supervisor: Prof. Toshiaki Suhara Doctoral Thesis Defense Quantum Engineering Design Course Graduate
More informationUltra-Slow Light Propagation in Room Temperature Solids. Robert W. Boyd
Ultra-Slow Light Propagation in Room Temperature Solids Robert W. Boyd The Institute of Optics and Department of Physics and Astronomy University of Rochester, Rochester, NY USA http://www.optics.rochester.edu
More information- Outline. Chapter 4 Optical Source. 4.1 Semiconductor physics
Chapter 4 Optical Source - Outline 4.1 Semiconductor physics - Energy band - Intrinsic and Extrinsic Material - pn Junctions - Direct and Indirect Band Gaps 4. Light Emitting Diodes (LED) - LED structure
More informationEdward S. Rogers Sr. Department of Electrical and Computer Engineering. ECE318S Fundamentals of Optics. Final Exam. April 16, 2007.
Edward S. Rogers Sr. Department of Electrical and Computer Engineering ECE318S Fundamentals of Optics Final Exam April 16, 2007 Exam Type: D (Close-book + two double-sided aid sheets + a non-programmable
More informationLaser Types Two main types depending on time operation Continuous Wave (CW) Pulsed operation Pulsed is easier, CW more useful
Main Requirements of the Laser Optical Resonator Cavity Laser Gain Medium of 2, 3 or 4 level types in the Cavity Sufficient means of Excitation (called pumping) eg. light, current, chemical reaction Population
More informationIntroduction to optical waveguide modes
Chap. Introduction to optical waveguide modes PHILIPPE LALANNE (IOGS nd année) Chapter Introduction to optical waveguide modes The optical waveguide is the fundamental element that interconnects the various
More informationB 2 P 2, which implies that g B should be
Enhanced Summary of G.P. Agrawal Nonlinear Fiber Optics (3rd ed) Chapter 9 on SBS Stimulated Brillouin scattering is a nonlinear three-wave interaction between a forward-going laser pump beam P, a forward-going
More informationWhat Makes a Laser Light Amplification by Stimulated Emission of Radiation Main Requirements of the Laser Laser Gain Medium (provides the light
What Makes a Laser Light Amplification by Stimulated Emission of Radiation Main Requirements of the Laser Laser Gain Medium (provides the light amplification) Optical Resonator Cavity (greatly increase
More informationSeptember 14, Monday 4. Tools for Solar Observations-II
September 14, Monday 4. Tools for Solar Observations-II Spectrographs. Measurements of the line shift. Spectrograph Most solar spectrographs use reflection gratings. a(sinα+sinβ) grating constant Blazed
More informationThe Report of the Characteristics of Semiconductor Laser Experiment
The Report of the Characteristics of Semiconductor Laser Experiment Masruri Masruri (186520) 22/05/2008 1 Laboratory Setup The experiment consists of two kind of tasks: To measure the caracteristics of
More informationLecture 10. Lidar Effective Cross-Section vs. Convolution
Lecture 10. Lidar Effective Cross-Section vs. Convolution q Introduction q Convolution in Lineshape Determination -- Voigt Lineshape (Lorentzian Gaussian) q Effective Cross Section for Single Isotope --
More informationSome Topics in Optics
Some Topics in Optics The HeNe LASER The index of refraction and dispersion Interference The Michelson Interferometer Diffraction Wavemeter Fabry-Pérot Etalon and Interferometer The Helium Neon LASER A
More informationLecture 5 Notes, Electromagnetic Theory II Dr. Christopher S. Baird, faculty.uml.edu/cbaird University of Massachusetts Lowell
Lecture 5 Notes, Electromagnetic Theory II Dr. Christopher S. Baird, faculty.uml.edu/cbaird University of Massachusetts Lowell 1. Waveguides Continued - In the previous lecture we made the assumption that
More informationMicro/Nanofabrication and Instrumentation Laboratory EECE 403. Dr. Lukas Chrostowski
Micro/Nanofabrication and Instrumentation Laboratory EECE 403 Dr. Lukas Chrostowski 1 Design cycle Design & Modelling Mask Layout Fabrication (outside) Final Test Fabrication (UBC) Midprocess test Today
More informationMEFT / Quantum Optics and Lasers. Suggested problems Set 4 Gonçalo Figueira, spring 2015
MEFT / Quantum Optics and Lasers Suggested problems Set 4 Gonçalo Figueira, spring 05 Note: some problems are taken or adapted from Fundamentals of Photonics, in which case the corresponding number is
More informationChapter 2 Basic Optics
Chapter Basic Optics.1 Introduction In this chapter we will discuss the basic concepts associated with polarization, diffraction, and interference of a light wave. The concepts developed in this chapter
More informationUC Berkeley UC Berkeley Previously Published Works
UC Berkeley UC Berkeley Previously Published Works Title Scaling of resonance frequency for strong injection-locked lasers Permalink https://escholarship.org/uc/item/03d3z9bn Journal Optics Letters, 3(3)
More informationOPTICAL COMMUNICATIONS S
OPTICAL COMMUNICATIONS S-108.3110 1 Course program 1. Introduction and Optical Fibers 2. Nonlinear Effects in Optical Fibers 3. Fiber-Optic Components I 4. Transmitters and Receivers 5. Fiber-Optic Measurements
More informationDistributed feedback semiconductor lasers
Distributed feedback semiconductor lasers John Carroll, James Whiteaway & Dick Plumb The Institution of Electrical Engineers SPIE Optical Engineering Press 1 Preface Acknowledgments Principal abbreviations
More informationElectromagnetic Waves Across Interfaces
Lecture 1: Foundations of Optics Outline 1 Electromagnetic Waves 2 Material Properties 3 Electromagnetic Waves Across Interfaces 4 Fresnel Equations 5 Brewster Angle 6 Total Internal Reflection Christoph
More informationLecture 7: Optical Spectroscopy. Astrophysical Spectroscopy. Broadband Filters. Fabry-Perot Filters. Interference Filters. Prism Spectrograph
Lecture 7: Optical Spectroscopy Outline 1 Astrophysical Spectroscopy 2 Broadband Filters 3 Fabry-Perot Filters 4 Interference Filters 5 Prism Spectrograph 6 Grating Spectrograph 7 Fourier Transform Spectrometer
More informationHomework 1. Nano Optics, Fall Semester 2017 Photonics Laboratory, ETH Zürich
Homework 1 Contact: mfrimmer@ethz.ch Due date: Friday 13.10.2017; 10:00 a.m. Nano Optics, Fall Semester 2017 Photonics Laboratory, ETH Zürich www.photonics.ethz.ch The goal of this homework is to establish
More information1. Reminder: E-Dynamics in homogenous media and at interfaces
0. Introduction 1. Reminder: E-Dynamics in homogenous media and at interfaces 2. Photonic Crystals 2.1 Introduction 2.2 1D Photonic Crystals 2.3 2D and 3D Photonic Crystals 2.4 Numerical Methods 2.5 Fabrication
More informationEdward S. Rogers Sr. Department of Electrical and Computer Engineering. ECE426F Optical Engineering. Final Exam. Dec. 17, 2003.
Edward S. Rogers Sr. Department of Electrical and Computer Engineering ECE426F Optical Engineering Final Exam Dec. 17, 2003 Exam Type: D (Close-book + one 2-sided aid sheet + a non-programmable calculator)
More informationElectrodynamics analysis on coherent perfect absorber and phase-controlled optical switch
Chen et al. Vol. 9, No. 5 / May 01 / J. Opt. Soc. Am. A 689 Electrodynamics analysis on coherent perfect absorber and phase-controlled optical switch Tianjie Chen, 1 Shaoguang Duan, and Y. C. Chen 3, *
More informationChapter-4 Stimulated emission devices LASERS
Semiconductor Laser Diodes Chapter-4 Stimulated emission devices LASERS The Road Ahead Lasers Basic Principles Applications Gas Lasers Semiconductor Lasers Semiconductor Lasers in Optical Networks Improvement
More informationElectron-Acoustic Wave in a Plasma
Electron-Acoustic Wave in a Plasma 0 (uniform ion distribution) For small fluctuations, n ~ e /n 0
More informationGroup Velocity and Phase Velocity
Group Velocity and Phase Velocity Tuesday, 10/31/2006 Physics 158 Peter Beyersdorf Document info 14. 1 Class Outline Meanings of wave velocity Group Velocity Phase Velocity Fourier Analysis Spectral density
More information6. Light emitting devices
6. Light emitting devices 6. The light emitting diode 6.. Introduction A light emitting diode consist of a p-n diode which is designed so that radiative recombination dominates. Homojunction p-n diodes,
More informationEE485 Introduction to Photonics
Pattern formed by fluorescence of quantum dots EE485 Introduction to Photonics Photon and Laser Basics 1. Photon properties 2. Laser basics 3. Characteristics of laser beams Reading: Pedrotti 3, Sec. 1.2,
More informationQuantum Dot Lasers. Jose Mayen ECE 355
Quantum Dot Lasers Jose Mayen ECE 355 Overview of Presentation Quantum Dots Operation Principles Fabrication of Q-dot lasers Advantages over other lasers Characteristics of Q-dot laser Types of Q-dot lasers
More informationLast Lecture. Overview and Introduction. 1. Basic optics and spectroscopy. 2. Lasers. 3. Ultrafast lasers and nonlinear optics
Last Lecture Overview and Introduction 1. Basic optics and spectroscopy. Lasers 3. Ultrafast lasers and nonlinear optics 4. Time-resolved spectroscopy techniques Jigang Wang, Feb, 009 Today 1. Spectroscopy
More informationA novel scheme for measuring the relative phase difference between S and P polarization in optically denser medium
A novel scheme for measuring the relative phase difference between S and P polarization in optically denser medium Abstract Yu Peng School of Physics, Beijing Institute of Technology, Beijing, 100081,
More informationSchool of Electrical and Computer Engineering, Cornell University. ECE 5330: Semiconductor Optoelectronics. Fall Due on Nov 20, 2014 by 5:00 PM
School of Electrical and Computer Engineering, Cornell University ECE 533: Semiconductor Optoelectronics Fall 14 Homewor 8 Due on Nov, 14 by 5: PM This is a long -wee homewor (start early). It will count
More information(a) Show that the amplitudes of the reflected and transmitted waves, corrrect to first order
Problem 1. A conducting slab A plane polarized electromagnetic wave E = E I e ikz ωt is incident normally on a flat uniform sheet of an excellent conductor (σ ω) having thickness D. Assume that in space
More informationA few Experimental methods for optical spectroscopy Classical methods Modern methods. Remember class #1 Generating fast LASER pulses
A few Experimental methods for optical spectroscopy Classical methods Modern methods Shorter class Remember class #1 Generating fast LASER pulses, 2017 Uwe Burghaus, Fargo, ND, USA W. Demtröder, Laser
More informationEmission Spectra of the typical DH laser
Emission Spectra of the typical DH laser Emission spectra of a perfect laser above the threshold, the laser may approach near-perfect monochromatic emission with a spectra width in the order of 1 to 10
More informationMODERN OPTICS. P47 Optics: Unit 9
MODERN OPTICS P47 Optics: Unit 9 Course Outline Unit 1: Electromagnetic Waves Unit 2: Interaction with Matter Unit 3: Geometric Optics Unit 4: Superposition of Waves Unit 5: Polarization Unit 6: Interference
More informationOptics.
Optics www.optics.rochester.edu/classes/opt100/opt100page.html Course outline Light is a Ray (Geometrical Optics) 1. Nature of light 2. Production and measurement of light 3. Geometrical optics 4. Matrix
More informationPhasor Calculations in LIGO
Phasor Calculations in LIGO Physics 208, Electro-optics Peter Beyersdorf Document info Case study 1, 1 LIGO interferometer Power Recycled Fabry-Perot Michelson interferometer 10m modecleaner filters noise
More informationCOMSOL Design Tool: Simulations of Optical Components Week 6: Waveguides and propagation S matrix
COMSOL Design Tool: Simulations of Optical Components Week 6: Waveguides and propagation S matrix Nikola Dordevic and Yannick Salamin 30.10.2017 1 Content Revision Wave Propagation Losses Wave Propagation
More informationOptical Properties of Left-Handed Materials by Nathaniel Ferraro 01
Optical Properties of Left-Handed Materials by Nathaniel Ferraro 1 Abstract Recently materials with the unusual property of having a simultaneously negative permeability and permittivity have been tested
More informationLecture 14 Dispersion engineering part 1 - Introduction. EECS Winter 2006 Nanophotonics and Nano-scale Fabrication P.C.Ku
Lecture 14 Dispersion engineering part 1 - Introduction EEC 598-2 Winter 26 Nanophotonics and Nano-scale Fabrication P.C.Ku chedule for the rest of the semester Introduction to light-matter interaction
More informationFiber Gratings p. 1 Basic Concepts p. 1 Bragg Diffraction p. 2 Photosensitivity p. 3 Fabrication Techniques p. 4 Single-Beam Internal Technique p.
Preface p. xiii Fiber Gratings p. 1 Basic Concepts p. 1 Bragg Diffraction p. 2 Photosensitivity p. 3 Fabrication Techniques p. 4 Single-Beam Internal Technique p. 4 Dual-Beam Holographic Technique p. 5
More informationModeling of a 2D Integrating Cell using CST Microwave Studio
Modeling of a 2D Integrating Cell using CST Microwave Studio Lena Simone Fohrmann, Gerrit Sommer, Alexander Yu. Petrov, Manfred Eich, CST European User Conference 2015 1 Many gases exhibit absorption lines
More informationc 2010 Young Mo Kang
c 2010 Young Mo Kang SEMI-ANALYTIC SIMULATIONS OF MICRORING RESONATORS WITH SCATTERING ELEMENTS BY YOUNG MO KANG THESIS Submitted in partial fulfillment of the requirements for the degree of Master of
More informationLASERS. Amplifiers: Broad-band communications (avoid down-conversion)
L- LASERS Representative applications: Amplifiers: Broad-band communications (avoid down-conversion) Oscillators: Blasting: Energy States: Hydrogen atom Frequency/distance reference, local oscillators,
More information= nm. = nm. = nm
Chemistry 60 Analytical Spectroscopy PROBLEM SET 5: Due 03/0/08 1. At a recent birthday party, a young friend (elementary school) noticed that multicolored rings form across the surface of soap bubbles.
More informationFIBER OPTICS. Prof. R.K. Shevgaonkar. Department of Electrical Engineering. Indian Institute of Technology, Bombay. Lecture: 17.
FIBER OPTICS Prof. R.K. Shevgaonkar Department of Electrical Engineering Indian Institute of Technology, Bombay Lecture: 17 Optical Sources- Introduction to LASER Fiber Optics, Prof. R.K. Shevgaonkar,
More informationγ c = rl = lt R ~ e (g l)t/t R Intensität 0 e γ c t Zeit, ns
There is however one main difference in this chapter compared to many other chapters. All loss and gain coefficients are given for the intensity and not the amplitude and are therefore a factor of 2 larger!
More information1 The formation and analysis of optical waveguides
1 The formation and analysis of optical waveguides 1.1 Introduction to optical waveguides Optical waveguides are made from material structures that have a core region which has a higher index of refraction
More informationOPTICAL Optical properties of multilayer systems by computer modeling
Workshop on "Physics for Renewable Energy" October 17-29, 2005 301/1679-15 "Optical Properties of Multilayer Systems by Computer Modeling" E. Centurioni CNR/IMM AREA Science Park - Bologna Italy OPTICAL
More informationFINITE-DIFFERENCE FREQUENCY-DOMAIN ANALYSIS OF NOVEL PHOTONIC
FINITE-DIFFERENCE FREQUENCY-DOMAIN ANALYSIS OF NOVEL PHOTONIC WAVEGUIDES Chin-ping Yu (1) and Hung-chun Chang (2) (1) Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei,
More informationMassachusetts Institute of Technology Physics 8.03 Practice Final Exam 3
Massachusetts Institute of Technology Physics 8.03 Practice Final Exam 3 Instructions Please write your solutions in the white booklets. We will not grade anything written on the exam copy. This exam is
More informationOptical Fiber Signal Degradation
Optical Fiber Signal Degradation Effects Pulse Spreading Dispersion (Distortion) Causes the optical pulses to broaden as they travel along a fiber Overlap between neighboring pulses creates errors Resulting
More informationMASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science
Time: March 10, 006, -3:30pm MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science 6.097 (UG) Fundamentals of Photonics 6.974 (G) Quantum Electronics Spring 006
More informationFabry-Perot Interferometers
Fabry-Perot Interferometers Astronomy 6525 Literature: C.R. Kitchin, Astrophysical Techniques Born & Wolf, Principles of Optics Theory: 1 Fabry-Perots are best thought of as resonant cavities formed between
More informationOptical amplifiers and their applications. Ref: Optical Fiber Communications by: G. Keiser; 3 rd edition
Optical amplifiers and their applications Ref: Optical Fiber Communications by: G. Keiser; 3 rd edition Optical Amplifiers Two main classes of optical amplifiers include: Semiconductor Optical Amplifiers
More informationChapter 8 Optical Interferometry
Chapter 8 Optical Interferometry Lecture Notes for Modern Optics based on Pedrotti & Pedrotti & Pedrotti Instructor: Nayer Eradat Spring 009 4/0/009 Optical Interferometry 1 Optical interferometry Interferometer
More informationLaser Physics OXFORD UNIVERSITY PRESS SIMON HOOKER COLIN WEBB. and. Department of Physics, University of Oxford
Laser Physics SIMON HOOKER and COLIN WEBB Department of Physics, University of Oxford OXFORD UNIVERSITY PRESS Contents 1 Introduction 1.1 The laser 1.2 Electromagnetic radiation in a closed cavity 1.2.1
More informationChapter9. Amplification of light. Lasers Part 2
Chapter9. Amplification of light. Lasers Part 06... Changhee Lee School of Electrical and Computer Engineering Seoul National Univ. chlee7@snu.ac.kr /9 9. Stimulated emission and thermal radiation The
More informationImpact of the Opto-Geometric Parameters on the Band Diagram and Transmission and Reflection Spectrum of the Bragg Structure
Optics and Photonics Journal, 2013, 3, 184-189 http://dx.doi.org/10.4236/opj.2013.32030 Published Online June 2013 (http://www.scirp.org/journal/opj) Impact of the Opto-Geometric Parameters on the Band
More informationHighly Efficient and Anomalous Charge Transfer in van der Waals Trilayer Semiconductors
Highly Efficient and Anomalous Charge Transfer in van der Waals Trilayer Semiconductors Frank Ceballos 1, Ming-Gang Ju 2 Samuel D. Lane 1, Xiao Cheng Zeng 2 & Hui Zhao 1 1 Department of Physics and Astronomy,
More informationRoom-temperature continuous-wave lasing from monolayer molybdenum ditelluride integrated with a silicon nanobeam cavity
In the format provided by the authors and unedited. DOI: 10.1038/NNANO.2017.128 Room-temperature continuous-wave lasing from monolayer molybdenum ditelluride integrated with a silicon nanobeam cavity Yongzhuo
More informationEXTENSIONS OF THE COMPLEX JACOBI ITERATION TO SIMULATE PHOTONIC WAVELENGTH SCALE COMPONENTS
European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006 P. Wesseling, E. Oñate and J. Périaux Eds c TU Delft, The Netherlands, 2006 EXTENSIONS OF THE COMPLEX JACOBI ITERATION TO SIMULATE PHOTONIC
More informationNon-linear Optics II (Modulators & Harmonic Generation)
Non-linear Optics II (Modulators & Harmonic Generation) P.E.G. Baird MT2011 Electro-optic modulation of light An electro-optic crystal is essentially a variable phase plate and as such can be used either
More informationPolarization control and sensing with two-dimensional coupled photonic crystal microcavity arrays. Hatice Altug * and Jelena Vučković
Polarization control and sensing with two-dimensional coupled photonic crystal microcavity arrays Hatice Altug * and Jelena Vučković Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305-4088
More informationWhere are the Fringes? (in a real system) Div. of Amplitude - Wedged Plates. Fringe Localisation Double Slit. Fringe Localisation Grating
Where are the Fringes? (in a real system) Fringe Localisation Double Slit spatial modulation transverse fringes? everywhere or well localised? affected by source properties: coherence, extension Plane
More informationRate Equation Model for Semiconductor Lasers
Rate Equation Model for Semiconductor Lasers Prof. Sebastian Wieczorek, Applied Mathematics, University College Cork October 21, 2015 1 Introduction Let s consider a laser which consist of an optical resonator
More informationHomework 1. Nano Optics, Fall Semester 2018 Photonics Laboratory, ETH Zürich
Homework 1 Contact: mfrimmer@ethz.ch Due date: Friday 12 October 2018; 10:00 a.m. Nano Optics, Fall Semester 2018 Photonics Laboratory, ETH Zürich www.photonics.ethz.ch The goal of this homework is to
More informationS. Blair September 27,
S. Blair September 7, 010 54 4.3. Optical Resonators With Spherical Mirrors Laser resonators have the same characteristics as Fabry-Perot etalons. A laser resonator supports longitudinal modes of a discrete
More informationProgress In Electromagnetics Research M, Vol. 20, 81 94, 2011
Progress In Electromagnetics Research M, Vol. 2, 8 94, 2 PHOTONIC BAND STRUCTURES AND ENHANCE- MENT OF OMNIDIRECTIONAL REFLECTION BANDS BY USING A TERNARY D PHOTONIC CRYSTAL IN- CLUDING LEFT-HANDED MATERIALS
More informationPaper Review. Special Topics in Optical Engineering II (15/1) Minkyu Kim. IEEE Journal of Quantum Electronics, Feb 1985
Paper Review IEEE Journal of Quantum Electronics, Feb 1985 Contents Semiconductor laser review High speed semiconductor laser Parasitic elements limitations Intermodulation products Intensity noise Large
More informationLecture 21 Reminder/Introduction to Wave Optics
Lecture 1 Reminder/Introduction to Wave Optics Program: 1. Maxwell s Equations.. Magnetic induction and electric displacement. 3. Origins of the electric permittivity and magnetic permeability. 4. Wave
More informationStep index planar waveguide
N. Dubreuil S. Lebrun Exam without document Pocket calculator permitted Duration of the exam: 2 hours The exam takes the form of a multiple choice test. Annexes are given at the end of the text. **********************************************************************************
More informationComputational Physics Approaches to Model Solid-State Laser Resonators
LASer Cavity Analysis & Design Computational Physics Approaches to Model Solid-State Laser Resonators Konrad Altmann LAS-CAD GmbH, Germany www.las-cad.com I will talk about four Approaches: Gaussian Mode
More informationWaves & Oscillations
Physics 42200 Waves & Oscillations Lecture 32 Electromagnetic Waves Spring 2016 Semester Matthew Jones Electromagnetism Geometric optics overlooks the wave nature of light. Light inconsistent with longitudinal
More informationGaussian Beam Optics, Ray Tracing, and Cavities
Gaussian Beam Optics, Ray Tracing, and Cavities Revised: /4/14 1:01 PM /4/14 014, Henry Zmuda Set 1 Gaussian Beams and Optical Cavities 1 I. Gaussian Beams (Text Chapter 3) /4/14 014, Henry Zmuda Set 1
More informationQuadratic nonlinear interaction
Nonlinear second order χ () interactions in III-V semiconductors 1. Generalities : III-V semiconductors & nd ordre nonlinear optics. The strategies for phase-matching 3. Photonic crystals for nd ordre
More information