The stabilization of the laser oscillation frequency of a dual-mode microchip laser was demonstrated by stabilizing the beat frequency generated by the two simultaneously oscillating longitudinal modes. In the experiment, a beat frequency of 101 GHz was stabilized to ± 50 kHz using negative feedback control. As a result, the fluctuation of the laser oscillation frequency was finally stabilized to ± 50 MHz or less within the resolution of the measurement instrument with an estimated short-term fluctuation of ± 3.3 MHz. Furthermore, using this technique, the initial drift of the laser oscillation frequency was significantly reduced, and the linear sweep operation of the laser oscillation frequency was successfully demonstrated by linearly sweeping the beat frequency over 30 MHz while maintaining locking. Our technique is essentially robust and suitable for the miniaturization of the system in the future.

中文翻译：

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通过拍频稳定化实现双模微芯片激光器的频率稳定化

通过稳定由两个同时振荡的纵向模式产生的拍频，证明了双模微芯片激光器的激光振荡频率稳定。在实验中，使用负反馈控制将101 GHz的拍频稳定在±50 kHz。结果，在估计的短期波动为±3.3MHz的范围内，激光振荡频率的波动最终稳定在测量仪器的分辨率内为±50MHz或更小。此外，使用该技术，可以显着减少激光振荡频率的初始漂移，并且通过在保持锁定的同时在30 MHz范围内线性扫描拍频，可以成功地证明激光振荡频率的线性扫描操作。