中国激光, 2014, 41 (3): 0302001, 网络出版: 2014-04-08
光栅反射镜作激光器后腔镜输出基横模线偏振光
Generating Linearly Polarized TEM00 Mode Laser Beam with Grating Mirror as the Back-Cavity Mirror
摘要
利用共振泄露型光栅反射镜的偏振选择原理,设计并制备了35层镀膜、1000 nm周期、70 nm槽深的直线型光栅反射镜,并通过微纳加工工艺制备了相应的样品。用对比法对样品进行测量,测得光栅反射镜对TE光的反射率为87%,对TM光的反射率为98%,验证了其在中心波长1064 nm处的偏振选择作用,与理论计算结果相符。使用光栅反射镜作为后腔镜,搭建了中心波长为1064 nm的NdYAG激光器,在抽运电流为20.1 A时获得了14.4 W的基横模线偏振光输出,经过实验测量,输出光偏振度可达到95.7%。
Abstract
With the polarization-selective property of the resonance leaky-mode grating mirror, a 35-layer grating mirror with 1000 nm period and 70 nm groove depth is designed and manufactured. The corresponding sample is prepared through the micro-nanofrabrication process. The bi-reflectivity of the sample is measured by contrast method, and its reflectivity is about 87% for TE wave and 98% for TM wave, which proves its polarization selection at the central wavelength of 1064 nm, and that is agree with theoretical result. Then the grating mirror is placed in a NdYAG laser cavity as the end mirror, with which a linearly polarized TEM00 laser beam at 1064 nm is got, its degree of polarization is about 95.7% and power is 14.4 W with pump current of 20.1 A.
方茗, 高健存, 唐新春, 唐淳, 裴正平, 于益. 光栅反射镜作激光器后腔镜输出基横模线偏振光[J]. 中国激光, 2014, 41(3): 0302001. Fang Ming, Gao Jiancun, Tang Xinchun, Tang Chun, Pei Zhengping, Yu Yi. Generating Linearly Polarized TEM00 Mode Laser Beam with Grating Mirror as the Back-Cavity Mirror[J]. Chinese Journal of Lasers, 2014, 41(3): 0302001.