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从速率方程出发,把激光介质的增益带宽以环程频移量为单位划分为若干频带并进行移频处理,仿真分析了基于Nd∶YVO4介质的频移反馈(FSF)激光器在连续输出情况下的特性,给出了在改变抽运功率水平、声光调制器(AOM)衍射效率、环程频移量、介质增益带宽等条件下频移反馈激光器的输出谱宽、频谱位移等的仿真计算结果。实验中,采用端面抽运驻波腔结构并以声光调制器作为腔内移频器,构建了基于Nd∶YVO4介质的全固态频移反馈激光器,实验研究验证了理论计算的结果,并得到了1 W以上的连续激光输出。研究结果表明频移反馈激光器的输出频谱在不同抽运水平下具有谱宽基本稳定的特点。
Based on the rate equation, the gain bandwidth of the laser medium is divided into several frequency bands by frequency shift of the frequency band and frequency-shifted. The frequency-shift feedback (FSF) laser based on Nd: YVO4 medium is simulated under continuous output , The simulation calculation of output spectral width and spectral shift of frequency-shift feedback laser under the conditions of changing pumping power level, AOM diffraction efficiency, cyclic frequency shift and medium gain bandwidth are given result. In the experiments, an all-solid-state frequency-shift feedback laser based on Nd: YVO4 medium was constructed by using end-pumping standing wave cavity structure and acousto-optic modulator as an intracavity frequency shifter. Experimental results verify the theoretical calculation and obtain Up to 1 W continuous laser output. The results show that the output spectrum of the frequency-shift feedback laser has the characteristics of stable spectral width at different pumping levels.