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提出了一种实现锁模光纤激光器波长稳定的方法,即向锁模激光器腔内注入连续光,使某一组纵模在注入连续光的基础上起振。这组纵模在对增益介质的竞争中可以稳定地占据优势,从而实现激光器输出光谱的稳定。理论分析发现注入连续光会使锁模激光器纵模线宽变大,而线宽的增大将会增加进入纵模的连续光功率。在实验中对基于掺铒光纤放大器(EDFA)的主动锁模光纤激光器进行波长稳定,激光器的调制频率为10.06 GHz,观察到了良好的稳定效果。为进一步检验波长稳定的效果,对锁模光纤激光器进行波长稳定后,将其输出的光信号经过一个法布里-珀罗(F-P)滤波器,稳定地滤出了功率较高的纵模。法布里-珀罗滤波器的自由光谱区(FSR)为40.24 GHz,透射峰3 dB带宽为40 MHz。实验结果证明纵模被稳定在法布里-珀罗滤波器的透射峰范围内,纵模波长的波动小于40 MHz。
A method to realize the wavelength stabilization of mode-locked fiber laser is proposed. That is, the continuous mode light is injected into the mode-locked laser cavity to make certain longitudinal mode vibrate on the basis of continuous light. This set of longitudinal modes can stably dominate the competition of the gain medium in order to stabilize the output spectrum of the laser. The theoretical analysis shows that the injection of continuous light makes the longitudinal mode linewidth of the mode-locked laser larger, and the increase of the linewidth will increase the continuous optical power entering the longitudinal mode. In the experiment, the active mode-locked fiber laser based on the erbium-doped fiber amplifier (EDFA) was wavelength-stabilized with a laser modulation frequency of 10.06 GHz and good stability was observed. In order to further verify the effect of wavelength stabilization, the mode-locked fiber laser is wavelength-stabilized, and its output optical signal is filtered through a Fabry-Perot (F-P) filter to stably filter the higher-power longitudinal modes. The Fabry-Perot filter has a free spectral range (FSR) of 40.24 GHz and a 3 dB bandwidth of 40 MHz. The experimental results show that the longitudinal mode is stabilized within the transmission peak of the Fabry-Perot filter and the fluctuation of the longitudinal mode wavelength is less than 40 MHz.