| 脉冲激光引起铜膜镜面的环形损伤波纹研究 |
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| 引用本文： | 王伟平,吕百达,刘仓理,张大勇,骆永全,谷卓伟.脉冲激光引起铜膜镜面的环形损伤波纹研究[J].强激光与粒子束,2003,15(3):225-228. |
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| 作者姓名： | 王伟平 吕百达 刘仓理 张大勇 骆永全 谷卓伟 |
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| 作者单位： | . 四川大学 激光物理与化学研究所， 四川 成都 610064； 2. 中国工程物理研究院 流体物理研究所， 四川 绵阳 621900 |
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| 基金项目： | 中国工程物理研究院基金资助课题(20020424)，国家863计划项目资助课题 |
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| 摘 要： | 用波长1.06μm、半高宽10ns的脉冲Nd:YAG激光辐照铜膜镜面，在激光辐照区，用光学显微镜观察到有规律的环形波纹状损伤图案，波纹平均周期约几十μm。通过对光路系统分析，认为样品前的小孔光阑对激光产生了菲涅尔衍射，使得在样品表面光强分布变成周期性环状分布。在极短的相互作用时间内，热扩散很小，损伤图案依赖于光强分布。并依据实验参数，用柯林斯公式对样品表面的光强分布进行了计算，所得光强分布的周期与损伤波纹的周期基本一致。
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| 关 键 词： | 激光效应 激光损伤 光学表面 波纹 |
| 文章编号： | 1001-4322(2003)03-0225-04 |
| 收稿时间： | 2002/8/27 |
| 修稿时间： | 2002年8月27日 |
Research of pulsed laser induced ripple damage on the surface of copper film mirror |
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| wang wei ping,l bai da,liu cang li,zhang da yong,luo yong quan,gu zhuo wei.Research of pulsed laser induced ripple damage on the surface of copper film mirror[J].High Power Laser and Particle Beams,2003,15(3):225-228. |
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| Authors: | wang wei ping l bai da liu cang li zhang da yong luo yong quan gu zhuo wei |
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| Institution: | 1. Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China；2. Institute of Fluid Physics, CAEP, P.O.Box 919 113, Mianyang 621900, China |
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| Abstract: | The damaged spot of copper film mirror irradiated by pulsed Nd:YAG laser is analyzed using an optical microscope. The periodic damage ring is found at the laser irradiation spot, the average spacing of these rings is about 45μm. The damage ring can be observed obviously only in the periphery of the laser spot under lower laser energy density; as laser fluence increases, the periodic damage rings cover the whole laser spot; under higher laser energy density, the whole film is damaged and the rings disappear. A Fresnel diffraction model is used to explain the appearance of these rings. The laser beam is diffracted by the aperture in the optic path, laser intensity distribution at the copper film mirror becomes periodic rings and damage ripple pattern forms instantly with the laser ablation and evaporation. The laser intensity distribution at the mirror surface is calculated using Collins formula, with which the period of damage rings and other phenomena can be explained. |
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| Keywords: | Laser effects Laser damage Optical surface Ripple |
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