| 热容模式下片状激光介质瞬态温度及热应力分析 |
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| 引用本文： | 杨建坤,曹丁象,郑万国,贺少勃,袁晓东,於海武,韩伟. 热容模式下片状激光介质瞬态温度及热应力分析[J]. 激光技术, 2007, 31(2): 196-199 |
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| 作者姓名： | 杨建坤 曹丁象 郑万国 贺少勃 袁晓东 於海武 韩伟 |
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| 作者单位： | 国防科学技术大学,长沙,410073;国防科学技术大学,长沙,410073;中国工程物理研究院,激光聚变研究中心,绵阳,621900;中国工程物理研究院,激光聚变研究中心,绵阳,621900 |
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| 基金项目： | 中国工程物理研究院基金 |
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| 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。
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| 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 |
| 文章编号： | 1001-3806(2007)02-0196-04 |
| 收稿时间： | 2006-02-17 |
| 修稿时间： | 2006-02-17 |
Analysis of transient temperature and thermal stress distribution for heat capacity disk laser |
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| YANG Jian-kun,CAO Ding-xiang,ZHENG Wan-guo,HE Shao-bo,YUAN Xiao-dong,YU Hai-wu,HAN Wei. Analysis of transient temperature and thermal stress distribution for heat capacity disk laser[J]. Laser Technology, 2007, 31(2): 196-199 |
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| Authors: | YANG Jian-kun CAO Ding-xiang ZHENG Wan-guo HE Shao-bo YUAN Xiao-dong YU Hai-wu HAN Wei |
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| Affiliation: | 1. National University of Defence Technology, Changsha 410073, China;2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | 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. |
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| Keywords: | laser technique diode-pumped transient temperature distribution thermal stress finite element methods |
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