基于双F-P标准具的宽调谐窄线宽Tm:YAP脉冲激光器

Widely Tunable Narrow Linewidth Tm:YAP Pulse Laser with Two F-P Etalons

设计了一种宽调谐、窄线宽、高重频的Tm:YAP脉冲激光器。采用三个切轴方向的Tm:YAP晶体作为增益介质,通过0.5 mmYAG材质F-P标准具和0.025 mm熔石英材质F-P标准具,激光器分别实现了49 nm、44 nm、51 nm波长连续调谐,具体分别为1 951~2 000 nm、1 932~1 976 nm、1 943~1 994 nm。同时测得激光线宽均在0.4 nm左右。声光调Q 10 kHz脉冲重复频率下,分别实现了最大平均功率5.08 W、6.29 W、4.83 W的脉冲激光输出。对比发现,b轴Tm:YAP激光器的平均功率最大,测得最大平均功率下的脉宽为65.7 ns,光束质量因子M2在x方向上为1.84,y方向上为1.93。结果表明b轴Tm:YAP晶体具有宽调谐、窄线宽、高功率、大能量激光的潜力。

A Tm:YAP pulsed laser with wide tuning,narrow linewidth,and high re-frequency was designed.Three tangential-axis oriented Tm:YAP crystals were used as the gain medium,and the lasers were continuously tuned at wavelengths of 49 nm,44 nm,and 51 nm by means of 0.5 mm YAG F-P standards and 0.025 mm fused-silica F-P standards,which were specified as 1 951~2 000 nm,1 932~1 976 nm,and 1 943~1 944 nm,respectively.Meanwhile,the measured laser linewidths were all around 0.4 nm.The pulsed laser outputs with maximum average power of 5.08 W,6.29 W,and4.83 W were achieved under the acousto-optic tuning Q 10 kHz pulse repetition frequency,respectively.Comparison reveals that the b-axis Tm:YAP laser has the largest average power,with a measured pulse width of 65.7 ns at the maximum average power,and a beam quality factor M2 of 1.84 in the x-direction and 1.93 in the y-direction.The results indicate that the b-axis Tm:YAP crystals have the potential for broadly-tuned,narrow linewidths,high power,and high-energy lasers.