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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 k Hz时,输出单脉冲能量为82μJ、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 m J,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M2x=2.48和M2y=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%。
A laser based on passive Q-switched Nd:YAG microchip structure with main oscillator power amplification and Nd:YVO4 multilayered amplification is reported. The main oscillation stage uses a Nd:YAG / Cr4 +: YAG passive Q-switched Q-switched micro-pico-laser with a single-pulse energy of 82μJ and a pulse width of 1 ns near the diffraction limit at a repetition rate of 1 kHz. In order to achieve signal amplification in Nd: YVO4 5 times, the design uses a multi-way round trip light path. The maximum single pulse energy is 2.3 mJ and the pulse width is 1 ns laser output. The peak power is more than 2 MW. The beam quality M2 factors are M2x = 2.48 and M2y = 1.24. The laser structure is simple and compact, the use of conduction cooling for heat dissipation, suitable for space laser, in the range of 15 ℃ ~ 32 ℃, the output energy fluctuation is less than 4%.