报道了一种用共焦法布里-珀罗(F—P)腔和稳定的HeNe激光对受控半导体激光器进行长时间频率锁定的方法:稳定的He—Ne激光作为参考标准,通过信号发生器和高压放大器扫描共焦F—P腔,同时将He—Ne激光与受控激光注入F—P腔,得到He—Ne激光与受拧激光的透射峰信号,将探测到的透射峰信号输入到数据采集卡中,用LabVIEW软件编写的程序可以确定扫描腔体时所有峰的位置,计算出He—Ne激光透射峰和受控激光透射峰的相对位置。与设定值比较,产生反馈电压信号使受控激光器频率稳定在设定值,将He—Ne激光的稳定性转移到受控激光上。利用此方法,实现了将半导体激光器(DL100)的激光频率稳定在所选择的波数为11716.1706cm^-1的位置,一小时频率漂移小于±2MHz。
A method which stabilizes the frequency of the slave laser in long time by confocal F-P cavity and stabilized He-Ne laser is reported. A frequency-stabilized He-Ne laser is employed as a reference, He-Ne laser and slave laser are injected to confocal F-P cavity which is scanned by a signal generator and a high-voltage amplifier at the same time. The transmission peak signals which are detected by photodetectors are delivered to data acquisition card. A program using LabVIEW software can determine all peak positions and calculate the relative position of transmission peak signals of He-Ne laser and the slave laser. Feedback voltage is generated to make the relative position of He-Ne laser and the slave laser equal to setting values, then the stability of He-Ne laser is translated to the slave laser. Using this method, a laser diode (DL 100) is stabilized at wavenumber of 11716. 1706 cm^-1 and the frequency drift is less than ±2 MHz in one hour.