SOLUTION SET. Chapter 6 RADIATION AND THERMAL EQUILIBRIUM - ABSORPTION AND STIMULATED EMISSION "LASER FUNDAMENTALS" Second Edition
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1 SOLUTION SET Chapter 6 RADIATION AND THERMAL EQUILIBRIUM - ABSORPTION AND STIMULATED EMISSION "LASER FUNDAMENTALS" Second Edition By William T. Silfvast
2 Cll ~ 1. Calculate the number of radiation modes in a cube 1 mm on a side for a spread of \ nm centered at nm and a spread of 0.01 µm centered at 10.6 µm. : dp(v)_ ~1T7/' d '").J - c. 3 ~ "'l u ~ b.e.v " f ~ks w, n t11 t{_ v f) I u ~ v a..._ef f ye-0 ~~L~ Wt ctn. Av ; ~: ''-- -! ] " JD VV\ ( b)
3 le!... IL/ ~-'l. _,_r ""-' NR.-.:. ~' ~?x ID e - i. ~<t/xio = /, ~s-x /(.) = 0
4 . c~~ 2. Consider a I-mm-diameter surface area of carbon (graphite). Calculate how many. I atoms would exist in energy levels from which they could emit radiation at wave- I lengths shorter than 700 nm (visible light and shorter wavelengths) for surface : temperatures of 300 K, 1,000 K, and 5,000 K when the solid is in thermal equilib-! rium at those temperatures. Assume that only those atoms within a depth of 10 nm of the material surface can emit observable radiation... ' N == ,_ $ (p >< 10 ardha.4/hulir, 2.25"'f~ /()fpc_.1-c._ =:- /./]X/029(1,fD~ I 1- q "'"'- / ~u_ C..&M. 3 ~ ~ "11 ~ l1 '- ( ~ f\l y-=-- To!iJ.-:B: "f et.tc~!.. :=. N V == /,I 3X Jo TT { O, D6oS) ""'- ID- ~ IA-\. J [ t.77e\/ -f.7~tj - f'-1,.. o - e -::. -e_ ~T J~T
5 3 (_~,) ( e (), 01 'f '0_ r.._;_ I ) L 2.x1D 7 AA AA = I tjoo I<- / -.._ - '1 w...1 o we v-- -i., l> 47 x I D I o o D le_ - 2 7, ~ w r f ~ 0 I v I "-7 f Q,,.. p () Vilt'. "!A..,-..., A... I D I Ys f'jo w-e~ =- N A h v ( o, s) (o, tjod fjl) For )OOk. (Cb we.~ ::: 7. If x 10.. "L~ <-(,}ftj)(t6-s' Fer- f 00() I::.._ Po we... v-- ::: w t.f.f-o v-- $'S'1 W ~ cj~'fer Thew-.. ()' T r;-0 & 0 I::-_ Po we v- :: ft..- ~ wo.-u-e I~~ ~s ~ : Co II/ s/'~ ~ ~,,l1.t u po p 'A, I~ Tio I;\_
6 CN ~ 3. In Problem 2, if the excited atoms that emit visible radiation decay in s and if only 0.002o/o of them decay radiatively (quantum yield of 2% ), how much power would be radiated from that surface at the aforementioned temperatures? Assume that half of the atoms that radiate emit into the 2n solid angle that would result in their leaving the surface of the material, and assume an average visible photon 1 energy of 2.5 ev. Also compute the total amount of power that could be radiated (over all wavelengths) from the surface at the given temperatures using the Stefan Boltzmann law (eqn. 6.15). Speculate as to why the two approaches for computing the radiated power are inconsistent at a temperature of 5,000 K.,. r, >-- T = s--oo ><I 0 -'1 IM. 3 ()() t:.. = /,D</ {)-'1 Yr;.. k A T -=- s-oo x 1 o-'1 k-\ I tjl!jo k... = ~ x 10 'i 1A-i. I<. ~ -~ >-- T::: 5'{)0 ><ID- kt s-0001<.= 2,!:,X/{) 1-tt k
7 C. /-1 (p 4. How much power is radiated from a 1-mm 2 surface of a body at temperature T when \ the peak measured wavelength is that of green light at 500 nm? ;. I -~ ;;:-oox10 ~ ' ( " I fo ) I / I ~ S-CJo ><to - ~ Vi-\.. A.ssu~ c~ =I favavt 1~J b I a_c.k. hod~ ltt-\ L_ 1''.._ G,.'-/OXI0 7 vj Vt-\ 1._ f o.,,.. I ~ ~ i =- I D - ~ ~ "2.. Po V)er ::: I x a ~Cl -::. i I Lf? x I() 7 }!! I 0-4'~ L = t,, t./w V"t '1.. -
8 C II (p 5. Determine the number of modes in a 1-cm 3 box for frequencies in the visible s~ec- / trum between 400 and 700 nm. Compare that value to the number of modes 1n a i i sodium streetlamp. that emits over a wavelength interval of 3 nm at a center wave- \ length of 589 nm. Assume that the streetlamp is a cylinder of radius 0.5 cm and length 10 cm. ' Lfoo &.1.~ a..-..,~t 76ti ~!A--\ 1 s (b) 5' ool c 4, ""-.s T ~t I"- ""-f VO I u... e =- ( o. 9 (",M "2.!> rr" mx1/'hl [_ - ~ rr ~ rr J x /,CJ, x io-(pw,. 3 ~ (!~7.~XIO-"t)} 3 ( S-'70,S-x10-')~ t:{ fj ~ v. v ~~ tg rr JJ "- &.. /) v_ ~ rr c L. 4 JJ, v CfiJ c_ 'J t.. 3 Ai VI AA ' v A LJ <(, -rr c 3 x1a-, >(t. = 11,x 10-(p) x, o I l. ~.tt-s cr-rei )( 10-1 )Lf t11t s lr.ecl- ftii.u.y;
9 C.Ht:> 6. Estimate the number of photons in both the box and the streetlamp of Problem 5 for temperatures of 300 K, 1,000 K, and 5,000 K. f-k V\ u IM., i1 ev () f p h 0 f ts ~ (_# VIAA> cla. s.) X (a ueyo--c;, ~rf f / J4tf)~) ~ vev"',&>.#- -e...~""; ~ / r Mriivt. Fov bo)(.. hr I.\~ p 1"4) ~ '4-~~ ii L., -r h T -l 2, 't:f x!() e V g, '1 S x I o- 2 e ij {), 4 31 e V J=' t> V' a._ ue.v'a..~ p lw fo ""- e,vl.lyv tj U U >--= s-so~~ =? hv-=.-i."l~ev. # p~!o~ -=:..,-/._)_I _'X_I D_'_'f ( ett~r-1) /,'"(I Xlo-2-'f L/7D t;"', ~c; X /t) I/ Aue.va'JR- p ~~ e~.e.- 11'-I ~ h v I~ L.I / e v ff) Y' s. rr~ Ct-t!4Y ~p t=i- p h o!bh.,s ~ /, 2 3 x ID I 2 le "'""/i:r - I) T 360 k!,{)co K ~ ooo I< # r tu. ID~.s --~ S-: /2 'XIO-J..'-f L.,, ~ i2~x.109
10 CHj 7. A 100-W incandescent lamp has a tungsten filament composed of a wire, 0.05 cm in diameter and 10 cm in length, that is coiled up to fit within the light bulb. Assume '. the filament is heated to a temperature of 3,000 K when the light bulb is turned I I on. How much power (watts) is emitted within the visible spectrum from the filament, assuming that it is emitting as a blackbody? As an approximation, you could divide the visible spectral region into several segments and compute the average contribution from each segment. Then simply add the averages together (instead of trying to integrate the blackbody function over the entire visible spectral range). A (VIV'-\\ Ll~ (vt V~\) IQ< ) T::. 110 O'D t<. c..'a ';.. S:lJ ~ ~ Av-eec = (_ (), I k) rr ({),{)I) DS) /Ii-\ ;: /, :;-/ x I (J- 'i VI-\'- A.,,.. a, vt. ep.- Av~. A ~T Pl>wer ( 7... "b."') 4\ U.t1.7r~ L/OO-'-{S?) l(2~ /,2?~XID -s 2. ~ 1..1 w Lf c;-o - ;;-o D t.;7 r- /,l/l) Xfo-:, L/, tq ~ IJ.} )00 - s-s-o S-2.S- /, )?S-X l'o - 3 '7, 10 w ~7) I. 7 2 ~- X. I o - > //,ID w 5~0 - ~DD ~DD -,S.. D ~'2-~ /, ~r.js-x JO - J /'-(, 2 7 w fqs-d - 7 t> D f.o 7~ 2# l>2s-x , /~ IA) -r ~ r;: '~ o~ W,.
11 Cllfe,! 8. Show that Planck's radiation law of (6.39) will lead to the Stefan-Boltzmann relationship of (6.15) if the power radiated over all wavelengths is considered. De-. termine the coefficients of the Stefan-Boltzmann constan( Hint: {oo x3 dx = ;r4. Jo ex-1 15 /,.,. f -- I~ l}'i.id'bj'1.-(f.r;,~2xio-~lf.]-s ) 1 r;',~'/ X (0-~ ~u vi,,&.. ~ '
12 C/10 9. An argon ion laser emits 2 W of power at nm in a 2-mm-diameter beam. What would be the effective blackbody temperature of the output beam of that I laser radiating over the frequency width of the laser transition, given that the laser 1 linewidth is approximately one fifth of the Doppler linewidth? Assume that the laser is operating at an argon gas temperature of 1,500 K and that the laser output is uniform over the width of the beam. ~(11):: ~{'j)) - t:.. I-== f.p, 37x10 s- w;~ 1... f;;yx._ ID~/':;. -1- t6t/ h -p>"i t:: 1.. J:(~) ~ 11'"...,, 07x10-1 '.r ( to.1rxlflv) "2.. -:::- I -t _ -... _,_ (1 XID ~ )l...(/t /fl )(ltj-3) :::: I+ D,o3~'-f-:.. I, DJ~'-1 -~\ -- T :::. --
13 Cllb 10. For the laser in Problem 9, how much power would be required for the stimulated \ I emission rate to equal the radiative decay rate? rt) r [3 (A_.e '2A t-v ) /J._ l),q_ 1.A {VJ f Y'tJ W't ( ~.s- 2. J V\::. I 'ti\!'-&{ ~ - L c:. - A... 3 "I <?str ~,~2r~ x1a :rs -:: f,'i}xur'>,rs l L/ ~~XI 0"'"'1 ~ J l \Ar\] rl~j =--.-=, r t-v) = t 1.<_ v 1 (_ {.. ;,..?) -;;_ A ~ :::: r:;. /, l.f i 'X IO - I) J' ~ 5!ft.\.) 2... ft;wer- = rx a..~"-::; '2.31~/l}&.;~'- rr(j()-~/.f.c.) :: 7, 2 ' )( I w :::: 7 2. '1 IM w t.t; it'~i. y1a,~c.( TD ""2.. W t "- p r ""e b ~ '-J
14 l 11 ft, 11. A pulsed and Q-switched Nd:YAG laser is focused to a 200-µ,m-diameter spot. size on a solid fiat metal target in an attempt to produce a bright plasma source j for microlithography applications. The plasma is observed to radiate uniformly I into 2n steradians with a wavelength distribution that is approximately that of a! I blackbody. The intensity of the Nd:YAG laser is adjusted so that the peak of the ' blackbody emission occurs at a wavelength of 13.5 nm, the optimum wavelength ~ as a source for EUV microlithography. What is the temperature of the blackbody? What fraction of the total energy radiated by the blackbody would be radiated within the useful bandwidth for microlithography of 0.4 nm centered around the emission maximum? Assume that the plasma doesn't expand significantly during the 10-ns emission time (the duration of the Nd:YAG laser pulses).,., lbj f J. S" X /() -., M T "I-:: <;;;" 7x10 'l vj (_ <.1 '1 '7 vo 5 )'1 1< 'I 6;r., 1. k. 'i ~r ::: io- rt ~ L;. A = rr Qo- L'J~ : 3# I 'f Xh(~ Y'A. 2.. D. '1 l'1 ~ b"- rt..~ ~14;-~I J I ~S-"1 ~ 1 ~ ~ J, /r)( / b- i. r { 0 1 y., ~ \ ( / 3.S-J( I 0 -Cf).. ) ( e (), () 1 Y''4'. r _ I) = ~. 'I~ x l'o ''- (, 't ) = x / o ' ' W/~ 4 - '6 '- 1.1'1)( lb ~ Ex. a Er
15 {, 1-1"" 12. The blackbody spectral distribution curve has a maximum wavelength Am that is \ dependent upon the temperature T of the radiating body. Show that the product i A.mT is a constant for any temperature (Wien's law, eqn. 6.16). Hint: Use the frequency version of the blackbody radiation formula instead of the wavelength version to show this. n.--p - I ( e ~ -1) bj dj -= J xi. (e x_ I)- '_ X 3 12: x - 1),.. -c:. ><. = c d~ t. X.. -I X "3- x ( e - 1) e -=- o x 3 - (_I _ e -x) ::. 0 ~, ~ x = ~.,) - ~ ::;:::_ h c. ~4, 1<. r r\..k.t, t.-~.sr~µj r I >-~ T=:... - ~:Jiflll'N( ----
16 CH~ 13. A blue argon laser beam at 488 nm is propagating around a coliseum as part of a \ laser light show. The power is measured to be 10 W cw at a specific location with '.. a beam diameter of 5 mm. What is the energy density per unit frequency u ( v) of : the beam at that location? /6 w T = 1f (_ 2, S-X I 0-3 )-a._""- '-- ~ (v ) - T ttj) c.. r AV l. J) ~ pp&i"' w tj. ~~ L..7xto 1 1f.;: _ r- t. 1 '6/-f c::- - - ~, XlfJ ~ ::>. {'"; () 1x10 5 W/~ '2.. -~ - r. Y X l lj ~ - ;-;/I!) B' i,/~ '3, / '-f >(ID S- S Wt 3
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