We report a fully stabilized self-referenced all-solid-state-laser frequency comb based on a home-built Kerr-lens mode-locked Yb:CaYAlO4 oscillator, which delivers ultrafast pulses with a pulse duration of 54 fs and an average power of 1.5 W. Free running carrier-envelope phase offset frequency (fceo) is observed with a signal to noise ratio of 40 dB at 100 kHz resolution bandwidth, which is phase-locked to a microwave frequency synthesizer with a residual phase jitter of 370 mrad [1 Hz–1 MHz] and with a standard frequency deviation of 0.8 mHz at 1-s gate time within 3-h, corresponding to the relative frequency instability of 2.9 × 10−18 at 1-s average time. It is the lowest phase noise and the highest frequency stability of fceo obtained in a watt-level all-solid-state bulk laser frequency comb to the best of our knowledge. A 13th repetition rate is simultaneously phase-locked to the same microwave standard with a frequency instability level of 10−12 at 1 s average time. Such fully stabilized power scaling Yb: CaYAlO4 laser frequency combs have great potential for applications in broadband dual comb spectroscopy as well as high loss cases such as long-distance time and frequency transfer.

中文翻译：

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平均功率为 1.5 W 的完全稳定的低相位噪声克尔透镜锁模 Yb:CYA 激光频率梳

我们报告了一种完全稳定的自参考全固态激光频率梳，它基于自制的克尔透镜锁模 Yb:CaYAlO4 振荡器，可提供脉冲持续时间为 54 fs 的超快脉冲和平均功率为1.5 W。在 100 kHz 分辨率带宽下观察到具有 40 dB 信噪比的自由运行载波包络相位偏移频率 (fceo)，该频率被锁相到具有 370 mrad 残余相位抖动的微波频率合成器 [ 1 Hz–1 MHz] 并且标准频率偏差为 0.8 mHz，在 3 小时内的 1 秒门控时间，对应于 1 秒平均时间的 2.9 × 10-18 的相对频率不稳定性。据我们所知，这是在瓦特级全固态体激光频率梳中获得的 fceo 的最低相位噪声和最高频率稳定性。第 13 个重复率同时锁相到相同的微波标准，频率不稳定性水平为 1 秒平均时间为 10-12。这种完全稳定的功率缩放 Yb: CaYAlO4 激光频率梳在宽带双梳光谱以及长距离时间和频率传输等高损耗情况下具有巨大的应用潜力。