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提出了一种紧凑高效的吉赫兹(GHz)1.34μm Nd…GdVO_4/V…YAG调Q锁模激光器。采用激光二极管进行端面抽运,将紧凑线性腔结构与透过率为10%的输出耦合镜相结合。优化了激光晶体的相关实验条件,理论分析了激光晶体的相关特性。实验中使用了Nd…GdVO_4晶体,Nd~(3+)离子掺杂质量分数为0.2%,V…YAG晶体的初始透过率为83%。利用该晶体实现了重复频率高达2GHz的锁模脉冲,所得锁模调制深度接近100%,调Q锁模激光器的最大输出功率可达715mW。基于波动机制理论,模拟了单个调Q包络下的锁模脉冲图形,所得理论结果与实验结果相符。
A compact and efficient 1 .4μm Nd ... GdVO_4 / V ... YAG Q-switched mode-locked laser is proposed. Laser diode end pumping, the compact linear cavity structure and the output of 10% through the combination of output coupling mirror. The experimental conditions of the laser crystal are optimized, and the related characteristics of the laser crystal are theoretically analyzed. In the experiment, Nd ... GdVO_4 crystal was used. The content of Nd ~ (3 +) ions was 0.2% and the initial transmittance of V ... YAG crystal was 83%. With this crystal, a mode-locked pulse with a repetition frequency of up to 2 GHz is achieved. The resulting mode-locked depth is close to 100%, and the maximum output power of a Q-switched mode-locked laser can reach 715 mW. Based on the fluctuating mechanism theory, a mode-locked pulse pattern under a single Q-switched envelope is simulated. The theoretical results obtained are in good agreement with the experimental results.