【摘要】 将正交波罗棱镜谐振腔应用于激光二极管(LD)抽运的光学参量振荡(OPO)激光器.实现了Ⅱ类非临界相位匹配KTP晶体的内腔式光参量振荡,获得了高机械稳定性、高热稳定性和较高光束质量的1.57μm人眼安全激光输出。正交波罗棱镜腔存在腔内振荡光束线偏振运行条件,匀化了内腔OPO的抽运光光场。正交波罗棱镜腔OPO激光器解决了内腔式光参量振荡信号光输出不稳定,以及腔内光功率密度较高容易引起光学损伤等工程应用难题。器件采用热传导冷却半圆柱面LD阵列侧向抽运Nd:YAG抽运几何,在20 Hz运行条件下获得平均脉冲能量86 mJ,脉冲宽度5.4 ns,光束发散角5 mrad,能量稳定性优于±2.5%,光-光转换效率(808 nm→1570 nm)9%的优异性能。更多还原

【Abstract】 Laser diode pumped optical parametric oscillator (OPO) laser is operated in the orthogonal porro-prism resonator.The 1.57μm eye-safe laser with high mechanical stability, high thermal stability and high beam quality is obtained base on the KTP type Ⅱ non-critical phase-matching.A linear polarized-oscillating condition exists in the resonator, and the field of the pump laser for the OPO can be homogenized.The laser solves the problems such as unstable signal output in the intracavity OPO and optical damage due to the exorbitant intracavity power density.The OPO laser is operated in the heat-conducted half-circular LD arrays pumped Nd:YAG laser, and produces the average pulse energy of 86 mJ at 20 Hz in a 5.4 ns pulse with an optical-to-optical conversion efficiency of 9%, the energy stability of ±2.5%, and the beam divergence of 5 mrad.更多还原