主被动锁模脉冲氙灯抽运Nd:YAG激光器的研究

为了克服主动锁模脉冲能量低、被动调Q锁模稳定性差、锁模不完全的缺点,采用Cr<'4+>:YAG和声光锁模器进行主被动联合锁模脉冲氙灯抽运的Nd:YAG激光器,实验验证和分析了Cr<4+>:YAG被动锁模,声光锁模器主动锁模及两者联合主被动锁模3种情况下输出脉冲的特性.结果表明,主被动联合锁模可得到200mJ输出能量、输...

Research of actively-passively mode-locked Nd:YAG laser pumped by pulse xenon lamp

In order to resolve the low output energy of active mode-locked laser and instability of passive mode-locked laser, Cr4+:YAG passive mode-locker and acousto-optic active mode-locker were used jointly for Nd:YAG laser mode-locking. The output characteristics of passively mode-locked by Cr4+:YAG only, actively mode-locked by acousto-optic mode-locker only and mode-locked by Cr4+:YAG and acousto-optic jointly were analyzed and compared through experiments. Results showed that the joint mode-locking method gave good resolution to the low output energy and stability, and the mode-lock amplitude and energy fluctuation were less than 5％, with the depth of mode locking of 100%, pulse width less than 450ps and output energy near 200mJ at 1064nm wavelength. Adding KTP crystal out of the cavity, the output conversion efficiency was about 41% at 532nm wavelength．The results show the possibility of actively-passively mode-locked technology and it is helpful for the development of mode-locking technology.