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将激光器输出频率相对于合适的参考频率标准进行锁定,可以有效地抑制激光器的频率起伏,提高激光器的频率稳定度。对铯原子偏振光谱进行平衡探测,当偏振光谱透射方向与偏振分束棱镜(PBS)偏振面之间的夹角选择合适时,平衡探测后的输出信号即为铯原子D2跃迁线的色散形鉴频信号。实验上实现了波长为852 nm的外腔式半导体激光器对应于铯原子6S1/2(F=4)→6P3/2(F′=5)超精细跃迁线的频率锁定。研究获得在50 s内激光器频率起伏小于±250 kHz,较相同时间内激光器自由运转时的频率起伏3 MHz有显著改善。这种频率锁定的方法不需要对激光器进行调制。
The laser output frequency relative to the appropriate reference frequency to lock the standard, you can effectively suppress the laser frequency fluctuations, improve the frequency stability of the laser. When the angle between the transmission direction of polarized spectrum and the polarization plane of polarization beam splitter prism (PBS) is properly chosen, the output signal after balance detection is the chromatic dispersion of cesium atom D2 transition line Frequency signal. Experimentally, the frequency locking of an external cavity semiconductor laser with a wavelength of 852 nm corresponds to a hyperfine transition line of 6S1 / 2 (F = 4) → 6P3 / 2 (F ’= 5) of cesium atoms. The study shows that the laser frequency fluctuation is less than ± 250 kHz in 50 s, which is significantly improved compared with the frequency fluctuation of 3 MHz in the free running of the laser in the same time. This method of frequency locking does not require modulation of the laser.