理论研究了棱镜组对非稳腔内激光光束的压缩.并在实际的非稳腔-稳腔混合腔板条电光调QNd:YVO₄激光器内部加入棱镜组,在非稳腔方向上压缩腔内光束,从而有效减小电光晶体BBO所需的体积,同时仍然能保证在激光晶体上有较大的基模体积,满足大功率输出的要求.当连续泵浦为66 W的时候,得到重复频率2 kHz脉冲激光的平均功率为3.6 W,平均每个脉冲能量为1.8 mJ.脉冲宽度为6 ns.实验结果表明,在加入棱镜组后,激光光束仍能保证很好的光束质量,并能获得高重复频率、高强度的短脉冲.

Compress of the beam in unstable resonators by prism pair is discussed theoretically. A pair of prisms are placed into an electro-optical Q-switch Nd:YVO₄ slab laser with an unstable-stable hybrid resonator. The beam is compressed in the unstable direction, which reduces the dimension of electro-optical crystal BBO and remains the large mode volume in the laser crystal. It fits high power performance. With CW pump power of 66 W, average power of pulse laser is 3.6 W at 2 kHz repetition rate, 1.8 mJ per pulse. Pulse width is 6ns. The experiment indicates that the laser can output high repetition rate and high intensity pulse with good beam quality, when the pair of prisms is in the resonator.