Improvement of the linearly polarized output power in Nd：YAG laser with [100]-cut rod

作     者：孙哲 李强 姜梦华 雷訇 惠勇凌 

作者机构：Institute of Laser Engineering 13eijing University of Technology Beijing 100124 China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2012年第10卷第B6期

页      面：120-124页

核心收录：

学科分类：080901[工学-物理电子学] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：Nd:YAG激光 输出功率 线偏振光 激光切割 比较实验 偏振方向 二极管泵浦 去极化 

摘      要：Thermal depolarization caused by birefringence is a major factor that limits the output power of linearly polarized Nd：YAG laser. This paper theoretically analyzes the thermal depolarization of [111]- and [100]- cut Nd：YAG rods and output power of two diode-pumped Nd：YAG rods are compared experimentally. φ3×80 mm sized [111]- and [100]- cut rods with doping concentration of 1.1±0.1at.% are used. With a pump power of 180 W, the ratio of linearly polarized output power versus unpolarized output power obtained with the [111]- and [100]- cut rods are 19% and 43% respectively, with a difference of 24%. The experiment demonstrates that in comparison with conventional [111]- cut Nd：YAG rod, [100]- cut Nd：YAG rod can improve the linearly polarized output power obviously. The thermal depolarization depends on the polarization direction for the [100]- cut Nd：YAG rod, and the linearly polarized output power can be improved by suitably modification of the polarization direction of linearly polarized laser to minimize thermal depolarization.