Simulation and experimental study of laser-induced thermal deformation of spectral beam combination grating

被引：15

作者：

Wang, Hanbin ^{[1
,2
]}

Song, Yinglin ^{[2
]}

Yang, Yifeng ^{[1
]}

Xian, Yuqiao ^{[1
,3
]}

You, Yang ^{[1
,3
]}

Liu, Meizhong ^{[1
,3
]}

Yuan, Zhijun ^{[1
]}

Wei, Taihui ^{[2
]}

He, Bing ^{[1
]}

Zhou, Jun ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai Key Lab All Solid State Laser & Appl Tec, Shanghai 201800, Peoples R China

[2] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China

[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

来源：

OPTICS EXPRESS | 2020年 / 28卷 / 22期

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

FIBER LASERS; TEMPERATURE;

D O I：

10.1364/OE.408832

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The multilayer dielectric (MLD) grating is a critical device for combining multiple laser beams into a single beam in a spectral beam combining (SBC) system. We established a theoretical thermal deformation model of the laser-irradiated MLD grating. Thermal deformation on the surface of the grating is simulated according to a series of parameters including the laser irradiation time, laser power density, and substrate size. To verify the model, we exposed a 9601/mm, 50x50x1.5 mm(3) grating to a laser power density of 3.61 kW/cm(2) and observed the temperature change. We used a Twyman-Green interferometer to measure the interference fringes on the grating surface. Based on the Fourier-transform method and a Zernike polynomial fitting method, the real-time grating surface profile is reconstructed. The results show that substrate thickness increase or area decrease can reduce thermal deformation, the average decreases are 18.3% and 19.9%, respectively. The discussion and analysis of the grating thermal deformation are potentially valuable for designing grating to decrease the thermal deformation and improve the combined beam quality of a SBC system. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：33334 / 33345

页数：12

共 30 条

[1] Wavelength beam combining of ytterbium fiber lasers [J].