Technology demonstration and prototype LPI test
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1 Frequency Comb on a Souding Rocket Technology demonstration and prototype LPI test Ronald Holzwarth Menlo Systems GmbH Martinsried And Max-Planck-Institut für Quantenoptik Garching 2013 STE-QUEST Workshop ESTEC, May 23rd, 2013
2 Frequency Combs Ted Hänsch Paradigm shift! ω opt =N ω rep + ω 0 Hz
3 Nobel Prize (2005) The Nobel Prize in Physics 2005 John L. Hall and Theodor W. Hänsch for their contributions to the development of laserbased precision spectroscopy, including the optical frequency comb technique Frequency Comb Technology gets scientific crown
4 Menlo Systems Spin-off from the Max-Planck-Institute for Quantum Optics (MPQ), founded No outside financing (some BMBF money and customer prepayment) Privately owned As of today: 70 employees (1/3 with PhD) >150 combs installed Located at a Innovation Centre (IZB) in the Munich area Bootstrapping
5 What are Combs good for? Time domain: Attosecond Physics Stable microwaves Direct comb Spectroscopy UV to THz Distance measurement Spectrograph calibration Precision spectroscopy Optical Frequency Synthesizer Clockwork for optical clocks Optical Reference Dissemination of time and frequency
6 Combs in Space: Areas of Interest Earth Observation: LIDAR, Gravimetry Navigation clocks, time and frequency dissemination Science Missions Tests of Relativity, Fundamental Constants, Astronomy
7 For The Rocky Road from Lab to Space - space optical clocks - distance measurements - etc. Drop tower Bremen Sounding rocket Satellite (2011) (2013) (20XX) Zero g for 5 sec 5 min years Funded by and in cooperation with
8 FOKUS Project Faseroptischer Kamm unter Schwerelosigkeit Goal: Development of a frequency comb for the use in microgravity (µ-g) on a sounding rocket. Work packages: mechanics optics Specially designed electronics software interface Partners: MPQ, Menlo Sytems, DLR RY Funded by
9 FOKUS Laser NOLM (nonlinear optical loop mirror) mode locking All PM fiber Only standard telecom components Extremely robust and easy to handle NOLM: Phase shift depended on optical power Design choice: 100 MHz repetition rate
10 Key data: Repetition rate: 100MHz Output power: 3mW Spectral bandwidth: 39nm Startup time: <10s FOKUS Comb
11 Radiation Sensitivity
12 Local Position Invariance LPI implies that the frequencies of two atomic clocks of different internal structure should suffer identical redshifts as they move together through a changing gravitational potential.
13 LPI Test Experiment RF atomic clock Frequency comb (Rb hyperfine transistion) DFB-Laser Optical atomic clock (Rb 5²S-5²P transition) Clock comparison (LPI test)
14 LASUS Project At FBH/HUB/UHH a DFB laser + rubidium spectroscopy cell has been developed. Robust mechanical design based on ceramics (DFB) / zerodur (Rb) Integrated photodiodes for Doppler-free and Dopplerbroadened signal. Fibercoupled output power: ~7mW, linewidth: ~1MHz Funded by
15 LASUS A. Kohfeldt, A. Wicht, A. Peters FBH V. Schkolnik, M. Krutzik HU H. Duncker, O. Hellmig, P. Windpassinger, K. Sengstock UHH
16 The FOKUS System Pressurized dome DC/DC converter Electronics On-board PC Rb Spectroscopy Weight: 23kg Size: 30 cm (height) x 30 cm (diameter) Volume: 28 l Comb Optics Pump module TEXUS Electronics / Battery
17 Measurement limit
18 FOKUS in real life
19 Flight Opportunity: TEXUS TEXUS: DLR program since 1970 s, 50 successful flights 400kg payload, zero g for 6 min. TEXUS 50 was launched on April 12, 2013,
20 Scheduled on TEXUS 51 TEXUS 51 launch in April 2013 was cancelled the day before launch (April 19 th, 2013). Miss aligned guiding rails Relaunch scheduled for November 2013
21 The extended FOKUS team T. Wilken, T.W. Hänsch MPQ M. Lezius, R. Holzwarth Menlo Systems A. Kohfeldt, A. Wicht, A. Peters FBH V. Schkolnik, M. Krutzik HU H. Duncker, O. Hellmig, P. Windpassinger, K. Sengstock UHH Thanks to: The workshops at the Institutes The Menlo Systems team DLR for funding
22 FOKUS before Integration into TEXUS 51
23 Rocket Engine VSB 30
24 TEXUS 50 inside the launcher
25 Launch of TEXUS 50
26 Future Space Combs ca. 190 x 140 x 75 mm 160 x 63 x 60 mm Pump 1 Comb Comb Pump Comb Pump 2 Follow-up project: FOKAL
27 Fiber Link Munich - Braunschweig 2 dark fibers ( ITU-T G.652 ) n ~ at 1550 nm A~ 0.23 db/km CD~18 ps/(nm km) 920 km total length Harald Schnatz Gesine Grosche Osama Terra Fritz Riehle Katharina Predehl Stefan Droste Thomas Udem Theodor Hänsch Ronald Holzwarth Science, Vol. 336, p. 441, 27 APRIL 2012
28 Now : 1840km
29 Menlo Systems WE TURN THE LIGHTS ON
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