光栅反射镜作为激光器后腔镜输出径向偏振光

Generating Radially Polarized Laser Beam with Polarization-Selective Grating Mirror as Cavity Mirror

利用光栅反射镜的偏振选择原理,设计并制备了35层镀膜、1000nm周期、70nm槽深的圆环型微结构光栅反射镜。使用该光栅反射镜作为激光二极管抽运的Nd∶YAG激光器的后腔镜,通过对激光谐振腔的优化,获得了功率为13.4 W的径向偏振激光。分析并设计偏振度的计算方法,测量得到径向偏振激光的偏振度可达97%。

By utilizing the principle of polarization-selective grating mirrors, a 35-iayer circular grating mirror, with1000 nm period and 70 nm groove depth, has been designed and fabricated. The grating mirror is placed in a laserdiode pumped NdYAG rod laser system as the cavity mirror. After optimizing the laser system, we get a radiallypolarized beam, of which the degree of radial polarization and the power are 97%and 13.4 W, respectively.