【摘要】 利用受激布里渊散射(SBS)相位共轭镜(PCM)能克服单棒Nd∶YAG的热效应,从而使光束质量提高到衍射极限。对于具有一定的热效应影响的YAG激光棒,采用工作在接近临界稳定区的凹 凸腔作为起始腔,通过对受激布里渊散射相位共轭腔进行优化设计,在抽运能量为 10 J,重复频率为 5 Hz时,得到稳定输出的能量为 20 mJ,脉宽为11 8 ns的近衍射极限的高质量激光脉冲。更多还原

【Abstract】 The beam quality of a single-rod Nd∶YAG laser can be improved almost up to the diffraction limit by using a phase-conjugating mirror (PCM) based on stimulated Brillouin scattering (SBS). As a single Nd∶YAG rod, whose thermal lens, stress birefringence and depolarization are surveyed experimentally, the stable output energy of 20 mJ with pulse duration of 11.8 ns, which has perfect beam quality, is obtained at repetition rate 5 Hz with pump energy of 10 J when the start cavity is the concave-convex cavity operating near a limit of stability in the g diagram and the SBS phase conjugation cavity is optimized.更多还原