热容模式下片状激光介质瞬态温度及热应力分析  

Analysis of transient temperature and thermal stress distribution for heat capacity disk laser

作　　者：杨建坤[1] 曹丁象[1] 郑万国[2] 贺少勃[2] 袁晓东[2] 於海武[2] 韩伟[2] 

机构地区：[1]国防科学技术大学,长沙410073 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《激光技术》2007年第2期196-199,共4页Laser Technology

基　　金：中国工程物理研究院重大基金资助项目(z0405)

摘　　要：为了研究激光介质热畸变对固体热容激光器的影响,数值计算了高功率激光二极管阵列抽运片状激光介质的瞬态温度场和热应力分布。结果表明,在相同的抽运功率密度下,激光介质中的温度分布和热应力分布不仅与激光介质几何构型及抽运光空间分布有关,还与抽运光斑在介质表面的填充因子密切相关。当抽运光斑未充满激光介质时,介质的表面靠近边缘处会出现大的拉应力集中,并且介质表面的最大轴向位移和最大拉应力随光斑填充因子增大而增大;而当抽运光充满介质时,表面是压应力,较小的拉应力存在于介质内部。Based on a 3-D transient thermal model with inhomogeneous heat generation, the temperature and thermal stress distribution in the disk of heat capacity laser pumped by high power laser diode array（LDA） are simulated and analyzed by means of finite element methods. The results indicate that for the same pump intensity, the temperature and thermal stress distribution in the disk are not only related with the medium＇s geometry and the special distribution of pump intensity but also related with the fill factor of pump area. When the fill factor is less than 1, the concentrated tensile stress appeares near edge of disk surface, while the fill factor reaches up to 1, the surface exhibites compressive stress, and the center is less tensile stress.

关 键 词：激光技术 二极管抽运 瞬态温度分布 热应力 有限元分析 

分 类 号：TN248.1[电子电信—物理电子学]