不同强度分布激光水平传输稳态热晕效应的数值模拟
Numerical simulation of horizontal propagationsteady‐state thermal blooming effect on laserbeam with different intensity distribution
查看参考文献8篇
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文摘
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采用数值模拟的方法,以高斯光束、平顶光束、有中心遮拦的平顶光束为例,研究了激光在均匀大气传输过程中产生的稳态热晕效应。详细分析了发射功率、传输距离、光束直径、横向风速四种参数对热晕效应的影响,得到了以上三种光束的斯特列尔比和峰值偏移量随广义热畸变参数N的变化关系。数值仿真结果表明,在其他参数一致的情况下,发射功率越大、传输距离越长,热晕效应越强;而光束直径和横向风速的增加会减小热晕效应;不同激光强度分布对热晕效应的影响不同。在同样广义热畸变参数N的条件下,高斯光束的热晕效应最严重,平顶光束次之,空心光束的热晕效应最小。 |
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其他语种文摘
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The horizontal propagation steady-state thermal blooming effects of laser beams with different intensity distributions, such as Gaussian beam, flat-top beam, and flat-top beam with center obscuration, have been investigated by numerical simulation. The impacts of the output power, the propagation distance, the beam diameter, and the wind velocity vertical to the propagation direction on the steady-state thermal blooming have been discussed for the above mentioned three kinds of beams. Furthermore, the steady-state thermal blooming induced Strehl ratio degradation and peak intensity offset versus the generalized thermal distortion parameter N after long-path horizontal propagation of laser beams with above mentioned three types of intensity distributions have been derived. The simulation results show that, for certain other parameters, the greater output power or longer propagation distance will induce the stronger thermal blooming, and the increment of the launch diameter or the convection wind velocity vertical to the propagation direction will weaken the thermal blooming oppositely. Furthermore, for laser beams with different intensity distributions, the impacts of the thermal blooming on the propagation are so different. Under the same generalized thermal distortion parameter N, the thermal blooming effect on the Gaussian beam is the most serious, followed by the flat-top beam, and flat-top beam with center obscuration is the smallest. |
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来源
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光电工程
,2018,45(2):170620-1-170620-13 【核心库】
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DOI
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10.12086/oee.2018.170620
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关键词
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激光传输
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稳态热晕
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强度分布
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数值模拟
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地址
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1.
中国科学院自适应光学重点实验室, 中国科学院自适应光学重点实验室, 四川, 成都, 610209
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中国科学院光电技术研究所, 四川, 成都, 610209
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1003-501X |
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学科
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电子技术、通信技术 |
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基金
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中国科学院创新基金
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文献收藏号
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CSCD:6204457
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参考文献 共
8
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