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为保证高输出功率前提下获得高光束质量的1064和532 nm激光共向输出,实验中,首先采用主振荡功率放大器系统有效地控制基频光束质量,获得平均功率为70 W、重复频率为10 kHz、脉宽为60 ns和光束质量因子M2约为3.9的1064 nm基频激光;接着利用二级放大器,获得平均功率为182.9 W,脉宽为80 ns的1064nm激光。然后,采用KTP晶体腔外倍频技术保证了基频和倍频激光同时、共向输出,最终获得了平均功率为65.7 W、脉宽约为60 ns的532 nm绿光,相应的倍频效率为35.9%。通过有效措施,绿光的光束质量因子M2约控制在6,为开展355 nm紫外激光研究奠定了良好的基础。
In order to ensure the high output power under the premise of 1064 and 532 nm laser beams with high beam quality, the main oscillator power amplifier system is used to control the fundamental beam quality effectively. The average power is 70 W and the repetition frequency is 10 kHz pulse width of 60 ns and a beam quality factor M2 of about 3.9 1064 nm fundamental laser; followed by a two-stage amplifier to obtain a mean power of 182.9 W, a pulse width of 80 ns 1064nm laser. Then, the KTP crystal extracavity frequency doubling technique is used to ensure that the fundamental frequency and the frequency doubling laser are output simultaneously and co-output. Finally, a 532 nm green light with an average power of 65.7 W and a pulse width of about 60 ns is obtained. The corresponding frequency doubling efficiency 35.9%. Through effective measures, the green beam quality factor M2 is about 6, which lays a good foundation for the research of 355 nm ultraviolet laser.