Optimization of laser dynamics for active stabilization of DF-VECSELs dedicated to cesium CPT clocks

Grégory Gredat; Hui Liu; Jérémie Cotxet; François Tricot; Ghaya Baili; François Gutty; Fabienne Goldfarb; Isabelle Sagnes; Fabien Bretenaker

doi:10.1364/JOSAB.389310

Optimization of laser dynamics for active stabilization of DF-VECSELs dedicated to cesium CPT clocks

Grégory Gredat, Hui Liu, Jérémie Cotxet, François Tricot, Ghaya Baili, François Gutty, Fabienne Goldfarb, Isabelle Sagnes, Fabien Bretenaker

Research output: Contribution to journal › Article › peer-review

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 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 σ_y = 5 × 10⁻¹³ over 1 s.

Original language	English
Pages (from-to)	1196-1207
Number of pages	12
Journal	Journal of the Optical Society of America B: Optical Physics
Volume	37
Issue number	4
DOIs	https://doi.org/10.1364/JOSAB.389310
Publication status	Published - 1 Apr 2020
Externally published	Yes

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title = "Optimization of laser dynamics for active stabilization of DF-VECSELs dedicated to cesium CPT clocks",

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 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 σy = 5 × 10−13 over 1 s.",

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T1 - Optimization of laser dynamics for active stabilization of DF-VECSELs dedicated to cesium CPT clocks

AU - Gredat, Grégory

AU - Liu, Hui

AU - Cotxet, Jérémie

AU - Tricot, François

AU - Baili, Ghaya

AU - Gutty, François

AU - Goldfarb, Fabienne

AU - Sagnes, Isabelle

AU - Bretenaker, Fabien

PY - 2020/4/1

Y1 - 2020/4/1

N2 - 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 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 σy = 5 × 10−13 over 1 s.

AB - 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 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 σy = 5 × 10−13 over 1 s.

U2 - 10.1364/JOSAB.389310

DO - 10.1364/JOSAB.389310

M3 - Article

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SN - 0740-3224

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JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

IS - 4

ER -

Optimization of laser dynamics for active stabilization of DF-VECSELs dedicated to cesium CPT clocks

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