离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

刘作业; 李露; 胡碧涛

doi:10.3969/j.issn.1001-3806.2012.05.021

离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

1.
兰州大学, 核科学与技术学院, 兰州, 730000

作者简介: 刘作业(1986- ),男,博士研究生,研究方向为飞秒激光脉冲的非线性效应..

通讯作者: 胡碧涛, hubt@lzu.edu.cn

基金项目:
国家自然科学基金资助项目(91026021)
中图分类号: 0435

Focusing property for ultra-short pulse laser reflected by off-axis parabolic mirrors

1.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

Corresponding author: HU Bi-tao, hubt@lzu.edu.cn

CLC number: 0435

摘要: 为了研究超短激光脉冲光束质量对焦斑的影响,采用经典的几何模型进行了理论模拟分析,并实验研究了离轴90°抛物面镜的飞秒激光光束的紧聚焦特性。由理论分析和实验结果可知,当入射失准角为3mrad时,将从空间上使焦斑峰值功率密度减半,失准角的存在将引起到达靶面的激光脉冲的时间展宽从而降低焦斑峰值功率密度;利用3TW钛宝石飞秒激光系统,通过ƒ/1离轴90°抛物面镜对激光束进行紧聚焦,得到最佳焦斑尺寸为5.6μm×5.4μm,对应于3mJ和96mJ的飞秒脉冲激光光束的焦斑峰值功率密度分别为3.83×1017W/cm2和1.23×1019W/cm2。结果表明,该研究为开展激光与固体、气体、团簇等物质相互作用的相关实验提供了重要的参考。
- 激光光学 /
- 峰值功率密度 /
- 超短激光脉冲紧聚焦 /
- 离轴抛物面镜
Abstract: In order to study the dependence of the focus on the quality of the femtosecond laser beam,the tighten focusing of the femtosecond laser beam reflected by a 90°off-axis parabolic mirror was studied experimentally and theoretically trough the classical geometrical optical model.The obtained theoretical and experimental results indicate that the peak power density of the laser spot will reduce by half when the declination reaches 3mrad.Simultaneously the optical path difference resulted from incident angle causes time broadening of the spot on the target surface and impairs the focal spot intensity to some degrees.A3TW Ti:sapphire laser system was adopted in the present work.The best focal spot obtained in the present work with an ƒ/1 off-axis parabolic mirror is 5.6μm×5.4μm and the peak power density is 3.83×1017W/cm2and 1.23×1019W/cm2for 3mJ and 96mJ ultra-short pulse laser separately.The study of the tighten focusing for ultra-short laser pulse reflected by 90°off-axis parabolic mirror.This research provides important information for the study on the interactions between the femtosecond laser pulses and solid,gas,clusters and so on.
- laser optics /
- peak power density /
- focal spot of ultra-short laser pulse /
- off-axis parabolic mirror

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离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

作者简介: 刘作业(1986- ),男,博士研究生,研究方向为飞秒激光脉冲的非线性效应..

通讯作者: 胡碧涛, hubt@lzu.edu.cn

Focusing property for ultra-short pulse laser reflected by off-axis parabolic mirrors

Corresponding author: HU Bi-tao, hubt@lzu.edu.cn

计量

离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

通讯作者: 胡碧涛, hubt@lzu.edu.cn

作者简介: 刘作业(1986- ),男,博士研究生,研究方向为飞秒激光脉冲的非线性效应.

English Abstract

Focusing property for ultra-short pulse laser reflected by off-axis parabolic mirrors

Corresponding author: HU Bi-tao, hubt@lzu.edu.cn

全文HTML

目录

留言板

离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

作者简介: 刘作业(1986- ),男,博士研究生,研究方向为飞秒激光脉冲的非线性效应..

通讯作者: 胡碧涛, hubt@lzu.edu.cn

Focusing property for ultra-short pulse laser reflected by off-axis parabolic mirrors

Corresponding author: HU Bi-tao, hubt@lzu.edu.cn

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出版历程

离轴抛物面镜对超短激光脉冲紧聚焦特性的研究

通讯作者: 胡碧涛, hubt@lzu.edu.cn

作者简介: 刘作业(1986- ),男,博士研究生,研究方向为飞秒激光脉冲的非线性效应.

English Abstract

Focusing property for ultra-short pulse laser reflected by off-axis parabolic mirrors

Corresponding author: HU Bi-tao, hubt@lzu.edu.cn

全文HTML

目录