Digital long-term laser frequency stabilization with an optical frequency comb.
Digital long-term laser frequency stabilization with an optical frequency comb.
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DOI：
10.1364/ao.428587
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发表时间：
2021-07
期刊：
影响因子：
1.9
通讯作者：
Peng-peng Zhou;Wei Sun;Shiyong Liang;Shao-long Chen;Zhiqiang Zhou;Yao Huang;H. Guan;K. Gao
中科院分区：
文献类型：
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作者：
Peng-peng Zhou;Wei Sun;Shiyong Liang;Shao-long Chen;Zhiqiang Zhou;Yao Huang;H. Guan;K. Gao
激光稳频在高精度光谱测量中起着重要作用。自高精度商用波长计问世以来，基于波长计的稳频技术因其方便、灵活、适用范围广而得到了广泛的应用。然而，由于波长计的波长测量的准确度受环境温度波动的影响，因此这种稳定方案经常遭受长期漂移。在这项工作中，我们证明，这种长期漂移可以抑制定期校准的波长计锁定激光器的频率，利用光学频率梳，它具有更好的长期稳定性。在这种双参考锁定方案下，对于在548 nm下操作的光纤激光器，在4000 s时Allan偏差减小到3.5 E-12，当用于7 Li+的光学Ramsey光谱测量时，与仅应用波长计锁定的情况相比，标准偏差减小多达40%。
Laser frequency stabilization plays an important role in high-precision spectroscopic measurements. Since high-accuracy commercial wavemeters became available, wavemeter-based frequency stabilization has found a broad application due to its convenience, flexibility, and wide applicability. However, such stabilization schemes frequently suffer from long-term drift, since the accuracy of the wavelength measurement of a wavemeter is affected by ambient temperature fluctuation. In this work, we demonstrate that such long-term drift can be suppressed by regularly calibrating the frequency of a wavemeter-locked laser utilizing an optical frequency comb, which has much better long-term stability. Under this dual-referenced locking scheme, the Allan deviation is reduced to 3.5 E-12 at 4000 s for a fiber laser operated at 548 nm, which when used in the optical Ramsey spectroscopic measurement of 7Li+, reduces the standard deviation by as much as 40%, compared to the case when only wavemeter locking is applied.