Abstract
We report the implementation and performance of a double servo-loop for intensity and phase-difference active stabilization of a dual-frequency vertical external-cavity surface-emitting laser (DF-VECSEL) for coherent population trapping (CPT) of cesium atoms in the framework of compact atomic clocks. In-phase fully correlated pumping of the two laser modes is identified as the best scheme for intensity noise reduction, and an analytical model allows optimization of the active stabilization strategy. Optical phase locking the beat-note to a local oscillator leads to a phase noise level below $ - {103}\;{\rm dBc/Hz}$ at 100 Hz from the carrier. The laser contribution to the short-term frequency stability of the clock is predicted to be compatible with a targeted Allan deviation below $ {\sigma _y} = 5 \times {10^{ - 13}} $ over 1 s.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Grégory Gredat, Debanuj Chatterjee, Ghaya Baili, François Gutty, Isabelle Sagnes, Fabienne Goldfarb, Fabien Bretenaker, and Hui Liu
Opt. Express 26(20) 26217-26226 (2018)
Paulo Hisao Moriya, Martin Lee, and Jennifer E. Hastie
Opt. Express 31(17) 28018-28025 (2023)
Sergey Kobtsev, Daba Radnatarov, Sergey Khripunov, Ivan Popkov, Valerii Andryushkov, and Tatiana Steshchenko
J. Opt. Soc. Am. B 36(10) 2700-2704 (2019)