Temperature nonuniformity occurring during the cooling process of a KDP crystal and its effects on second-harmonic generation

被引：12
作者：
Liang, Yingchun [1 ]
Su, Ruifeng [1 ]
Lu, Lihua [1 ]
Liu, Haitao [2 ]
机构：
[1] Harbin Inst Technol, Ctr Precis Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Dept Mfg, Harbin 150001, Peoples R China
来源：
APPLIED OPTICS | 2014年 / 53卷 / 23期
基金：
中国国家自然科学基金;
关键词：
SOLID-STATE LASERS; HIGH AVERAGE POWER; NONLINEAR CRYSTALS; MANAGEMENT; AMPLIFIERS; FACILITY; DIAMOND;
D O I：
10.1364/AO.53.005109
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The temperature nonuniformity occurring during the cooling process of a KDP crystal is studied, along with its effects on the second-harmonic generation (SHG) of a high-average-power laser. A comprehensive model is proposed incorporating principles of thermodynamics, mechanics, and optics, and it is applied to investigate the temperature nonuniformity and its effects. The temperature rise caused by linear absorption is calculated, while the temperature nonuniformity occurring during the cooling process is analyzed using the finite-element method (FEM). The stress induced by the nonuniformity is then studied using the FEM, and the trend of its change is determined. Moreover, the changes in refractive index caused by the stress are calculated, the results of which are used to determine the variations in the induced phase mismatch. The SHG efficiency considering the phase mismatch is eventually obtained by solving the coupling wave equations. The results demonstrate that the temperature nonuniformity has negative effects on the SHG efficiency. (C) 2014 Optical Society of America
引用
收藏
页码：5109 / 5116
页数：8
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