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.

中文翻译：

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优化激光动力学，以主动稳定专用于铯CPT时钟的DF-VECSEL

我们报告了双伺服环路的强度和相差有源稳定的双频垂直外腔表面发射激光器（DF-VECSEL）的铯原子中相干人口陷阱（CPT）的实现和性能。紧凑型原子钟的框架。两种激光模式的同相全相关泵浦被确定为降低强度噪声的最佳方案，而分析模型可以优化主动稳定策略。将拍子音锁定到本地振荡器的光学相位会导致在距载波100 Hz处的相位噪声水平低于$-{103} \; {\ rm dBc / Hz} $。激光对时钟的短期频率稳定性的贡献预计与下面的目标艾伦偏差兼容$ {\ sigma _y} = 5 \ times {10 ^ {-13}} $，超过1 s。