摘要
为了改善激光晶体热效应,建立了矩形截面激光晶体热模型,通过求解热传导泊松方程,比较了矩形截面Nd:YVO_4和Nd:GdVO_4及Nd:GdYVO_4晶体的温度场分布和抽运端面的热形变,计算了由抽运端面热形变引起的光程差和总的光程差。由比较结果可知,在相同情况下,Nd:YVO_4,Nd:GdYVO_4及Nd:GdVO_4晶体的端面中心最高温升分别约为320℃,342℃和190℃,总光程差最大为1.7μm,2.11μm和1.3μm。结果表明,Nd:GdYVO_4晶体端面中心最高温升及总光程差均为最小,更适用于大功率LD端面抽运;对于大功率全固态激光器,由端面热形变引起的光程差对晶体热焦距有较大影响。
To improve the thermal effect of laser crystal, the rectangle thermal conduct model of laser crystal was established. The temperature distribution and end-thermal deformation of rectangle Nd： YVO4/Nd： GdVO4/Nd： GdYVO4 laser crystals were obtained after solving Possion equation, and the optical path difference （OPD） induced by end-thermal deformation and the total OPD were calculated. After comparison, it was shown that in the same eondation, the highest central temperatures of the pumped face of Nd： YVO4, Nd： GdYVO4 and Nd： GdVO4 crystals were 320℃, 342℃ and 190℃, the biggest total OPD were 1.7μm, 2. 11μm and 1.3μm respectively. The results show that the central temperature rise and the total OPD of Nd： GdYVO4 crystal are the smallest and it is fitter for the pumped face of LD with high power. The study shows that the OPD induced by end-thermal deformation have a large influence on thermal focal length of laser crystals for solid-state lasers with high power
出处
《激光技术》
CAS
CSCD
北大核心
2010年第3期323-325,共3页
Laser Technology
关键词
激光器
端面热形变
泊松方程
ND:GDVO4
光程差
热焦距
lasers
end-thermal deformation
Possion equation
Nd： GdVO4
optical path difference （ OPD ）
thermal focal length
