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Proceedings Paper

Dual-frequency VECSELs for Cs clocks (Conference Presentation)
Author(s): Fabien Bretenaker; Hui Liu; Gregory Gredat; Fabienne Goldfarb; Ghaya Baili; François Gutty; Isabelle Sagnes

Paper Abstract

The generation of optically carried radio frequency (RF) is an important issue in the area of microwave photonics (MWP), which has gained tremendous developments and has a bright future [1]. Dual-frequency vertical-external-cavity surface-emitting laser (DF-VECSEL) [2], sustaining two cross-polarized laser in a same optical cavity, is an attractive solution to generate such an optically carried RF signal. With class-A dynamics, DF-VECSEL can exhibit a low intensity noise and be free of relaxation oscillation (RO), due to the fact that the lifetime of the photons inside the external cavity can be longer than the lifetime of the semiconductor gain media carriers. Additionally, DF-VECSEL is also interesting for atomic clocks. Indeed, coherent population trapping (CPT) atomic clock [3] is promising to realize miniaturized atomic clocks, but requires a trade-off between performance and size. Recently, a report gives out a solution using two pulses and a double lambda atomic system to obtain high contrast Ramsey fringes [4]. It is expected that the trade-off can be improved by the combination of DF-VESCEL and the double lambda atomic system configuration of CPT atomic clocks [5]. One key parameter of the DF-VECSEL for such applications is its noise. We report in this paper our efforts to understand the origin of the amplitude and phase noises of the laser and to reduce these noises by optimizing the laser cavity design and the pumping architecture. 1. J. Capmany, José and D. Novak. Nature Photonics 1, 319 (2007). 2. G. Baili, L. Morvan, M. Alouini, D. Dolfi, F. Bretenaker, I. Sagnes, and A. Garnache. Opt Lett. 34, 3421 (2009). 3. J. Vanier, Appl. Phys. B 81, 421 (2005). 4. T. Zanon et al., Phys. Rev. Lett. 94, 193002 (2005). 5. P. Dumont et al. J. Lightwave Technol. 32, 3817 (2014.

Paper Details

Date Published: 13 March 2019
Proc. SPIE 10901, Vertical External Cavity Surface Emitting Lasers (VECSELs) IX, 109010K (13 March 2019); doi: 10.1117/12.2513897
Show Author Affiliations
Fabien Bretenaker, Lab. Aimé Cotton (France)
Raman Research Institute (India)
Hui Liu, Lab. Aimé Cotton (France)
Gregory Gredat, Lab. Aimé Cotton (France)
Fabienne Goldfarb, Lab. Aimé Cotton (France)
Ghaya Baili, Thales Research & Technology (France)
François Gutty, Thales Research & Technology (France)
Isabelle Sagnes, Ctr. de Nanosciences et de Nanotechnologies (France)

Published in SPIE Proceedings Vol. 10901:
Vertical External Cavity Surface Emitting Lasers (VECSELs) IX
Ursula Keller, Editor(s)

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