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利用声光调制器(AOM)的偏频特性,以CH4分子吸收线R9支一条强吸收线(λ=1.6378μm)作为参考频率,实现了对外腔式半导体激光器的无调制频率锁定。实验中在100 s内典型的频率起伏小于5.6 MHz,较激光器自由运转时的频率起伏34 MHz有了显著的改善,而误差信号的阿仑(Allan)方差平方根(即稳定度)在平均积分时间为16 s时达到最小值5.75×10-10。该方法实现了基于气体分子吸收线的半导体激光器无调制锁频,并且CH4分子在1.6~1.7μm处有丰富的振转光谱,满足光纤通信中对激光器输出波长的要求,可应用于光纤通信中激光光源的频率锁定。
By using the offset characteristic of AOM, a strong absorption line (λ = 1.6378μm) of R9 absorption line of CH4 is taken as the reference frequency to realize the unmodulated frequency locking of the external cavity semiconductor laser. The typical frequency fluctuation in the experiment is less than 5.6 MHz in 100 s, which is significantly better than the frequency fluctuation of 34 MHz when the laser is in free running. The square root of the Allan variance of the error signal (ie, stability) Reaching a minimum of 5.75 × 10-10 at 16 s. The proposed method achieves unmodulated frequency locking of semiconductor lasers based on gas molecule absorption lines. CH4 molecules have abundant vibration spectra at 1.6 ~ 1.7μm, which can meet the requirements of laser output wavelength in optical fiber communication and can be used in optical fiber communication Laser light source frequency lock.