中国激光, 2004, 31 (8): 935, 网络出版: 2006-06-12
采用射频频率调制光谱实现半导体激光器稳频
Frequency Locking of a Semiconductor Laser via Radio-Frequency Modulation Spectrum
激光技术 射频调制 频率稳定 铯原子 半导体激光器 laser technique radio-frequency modulation frequency stabilization cesium atom semiconductor laser
摘要
利用半导体激光器可直接对注入电流进行高速调制的特点,将20 MHz射频(RF)信号直接加在半导体激光器的高频调制端口,射频信号的一部分经过相移器后,与雪崩光电探测器(APD)所探测的饱和吸收光谱信号进行混频,经低通滤波器后产生了类色散曲线;将半导体激光器的输出频率稳定在铯原子D2线的6S1/2(F=4)→6P3/2(F′=5)的超精细跃迁线上,实验所测的10 s内典型的频率起伏小于1 MHz;这种稳频技术不需锁相放大器,具有可避免低频段较高的强度噪声和较大的频率捕获范围的优点。
Abstract
The injection current of the diode laser can be modulated by radio-frequency (RF) signal. The RF signal of 20 MHz is input to the high frequency modulation port of diode laser, and part of it is phase shifted and mixed with the saturated absorption spectral signal then input to the low-pass filter. The resulted similar dispersion signal is used to stabilize the frequency of laser to 6S1/2 (F=4)→6P3/2 (F′=5) transition of cesium atom and the frequency stability is better than 1 MHz in 10 s. The stabilization technology has the characteristics of lower intensity noise and higher frequency capture range.
赵建明, 尹王保, 赵延霆, 肖连团, 贾锁堂. 采用射频频率调制光谱实现半导体激光器稳频[J]. 中国激光, 2004, 31(8): 935. 赵建明, 尹王保, 赵延霆, 肖连团, 贾锁堂. Frequency Locking of a Semiconductor Laser via Radio-Frequency Modulation Spectrum[J]. Chinese Journal of Lasers, 2004, 31(8): 935.
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