中国激光, 2015, 42 (9): 0902005, 网络出版: 2015-09-06
传导冷却结构紧凑型高峰值功率纳秒级激光器
Conduction Cooling and Compact,High Peak-Power,Nanoseconds Pluse Lasers
激光器 主振荡功率放大器 多程放大 被动调Q lasers master oscillator power amplifier multipass amplification passive Q- switched Nd∶YAG Nd∶YAG Nd∶YVO4 Nd∶YVO4
摘要
报道了一种基于被动调Q Nd∶YAG 微片结构的主振荡功率放大和Nd∶YVO4板条多程放大的激光器。主振荡级采用Nd∶YAG/Cr4+∶YAG 被动调Q 微片激光器,在重复频率为1 kHz时,输出单脉冲能量为82 μJ 、脉冲宽度为1 ns的近衍射极限的激光输出。为了实现信号光在Nd∶YVO4中获得5 次放大,设计采用了多程往返光路。得到最大单脉冲能量为2.3 mJ ,脉宽为1 ns 的激光输出,峰值功率大于2 MW ,光束质量M2 因子为M 2x = 2.48 和M 2y = 1.24 。该激光器结构简单、紧凑,采用传导冷却进行散热,适用于空间激光,在15 ℃~32 ℃的范围内,输出能量波动小于4%。
Abstract
A master oscillator power amplifier (MOPA) structure based on Nd∶YAG microchip and Nd∶YVO4 slab is reported. The master oscillator is a passive Q-switched Nd∶YAG/Cr4+∶YAG microchip laser, and the seed laser with pulse energy of 82 mJ and pulse width of 1ns is obtained when the repetition frequency is 1 kHz. In the amplifier, an output pulse energy of 2.3 mJ with peak powers reaching 2 MW and pulse width of 1ns is obtained while the oscillator provides the amplifier with a 82 mJ input. Meanwhile, the M2 factor of beam quality is measured to be 2.48 at x direction and 1.24 at y direction. This laser systerm is compact and air-cooled, the fluctuation of output energy is below 4% when the temperature ranges from 15 ℃ to 32 ℃.
谢银, 孟俊清, 祖继峰, 陈卫标. 传导冷却结构紧凑型高峰值功率纳秒级激光器[J]. 中国激光, 2015, 42(9): 0902005. Xie Yin, Meng Junqing, Zu Jifeng, Chen Weibiao. Conduction Cooling and Compact,High Peak-Power,Nanoseconds Pluse Lasers[J]. Chinese Journal of Lasers, 2015, 42(9): 0902005.