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光整流法产生THz辐射转化率的理论分析 被引量:2

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摘要 从理论上分析了超短激光脉冲在二阶非线性晶体中光整流效应产生THz辐射的过程,讨论了影响激光能量转换为THz辐射能量的效率的各种因素;入射激光脉冲宽度对转换效率影响非常大.对于一般二阶非线性晶体,当晶体厚度等于相干长度Lc时,光对THz的转换效率最高.对于周期性极化的非线性晶体,在忽略介质吸收的情况下,转换效率与介质厚度成正比.考虑介质对THz的吸收,晶体的有效长度Leff=0.63/α,再增大晶体长度,转化效率将没有明显增加,并最终趋于常数.
出处 《中国科学(E辑)》 CSCD 北大核心 2009年第4期745-750,共6页 Science in China(Series E)
基金 国家重点基础研究发展计划("973"计划)(批准号:2007CB310401)资助项目
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