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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-62A2-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-62A4-D
Genre: Journal Article

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ApplPhysB91_49.pdf (Publisher version), 803KB
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Döringshoff, K.1, Author
Ernsting, I.1, Author
Rinkleff, Rolf-Hermann2, Author              
Schiller, S.1, Author
Wicht, A.2, Author
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1External Organizations, , , ou_persistent22              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24010              

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 Abstract: 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.

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 Dates: 2008
 Publication Status: Published in print
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 Identifiers: eDoc: 359653
DOI: 10.1007/s00340-008-2955-0
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Title: Applied Physics B
Source Genre: Journal
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Pages: - Volume / Issue: 91 (1) Sequence Number: - Start / End Page: 49 - 56 Identifier: ISSN: 1432-0649