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Frequency comb-referenced narrow linewidth diode laser system for coherent molecular spectroscopy

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons4313

Rinkleff,  Rolf-Hermann
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Wicht,  A.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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ApplPhysB91_49.pdf
(Verlagsversion), 803KB

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Zitation

Döringshoff, K., Ernsting, I., Rinkleff, R.-H., Schiller, S., & Wicht, A. (2008). Frequency comb-referenced narrow linewidth diode laser system for coherent molecular spectroscopy. Applied Physics B, 91(1), 49-56. doi:10.1007/s00340-008-2955-0.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-62A2-2
Zusammenfassung
We analyze in detail the frequency noise properties of a grating enhanced external cavity diode laser (GEECDL). This system merges two diode laser concepts, the grating stabilized diode laser and the diode laser with resonant optical feedback, thus combining a large tuning range with an excellent short-term frequency stability. We compare the frequency noise spectrum of a GEECDL to that of a grating stabilized diode laser and demonstrate a 10-fold reduction of the frequency noise linear spectral density. The GEECDL is phase locked to a similar laser and to a fs-frequency comb with a servo loop providing an open-loop unity-gain frequency of only 237 kHz, which is a tenth of the bandwidth typically required for grating stabilized diode lasers. We achieve a residual rms phase error as small as 72 mrad (≈ 200 mrad) for stabilization to a similar laser (to the fs-frequency comb). We demonstrate that the novel diode laser can phase-coherently track a stable optical reference with an instability of 1.8×10-16 at 1 s. This laser system is well suited for applications that require phase locking to a low-power optical reference under noisy conditions. It may also be considered for the implementation of optical clock lasers.