飞秒激光成丝过程中的太赫兹波超光速传输现象研究
Research on superluminal propagation of terahertz wave during femtosecond laser filamentation
查看参考文献9篇
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文摘
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通过使用太赫兹(Terahertz,THz)时域光谱系统,探测从不同长度飞秒激光光丝辐射出的THz脉冲,观察到THz波在飞秒激光成丝过程中超光速传输的实验现象。进一步的分析表明:THz波在等离子体光丝区域的折射率小于其在空气中的折射率,这是使得THz波能够在成丝过程中超光速传输的主要原因。由此可以推测:THz脉冲极有可能是在等离子体光丝中进行导引传输的。最后,通过数值模拟获得了光丝区域内的THz本征模式,从而验证了上述推测。 |
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其他语种文摘
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In this paper, by investigating the terahertz (THz) waveforms emitted from different lengths of filaments via THz time-domain spectroscopy system (THz-TDS), superluminal propagation of THz wave during filamentation was observed. It implies that the refractive index of the THz wave is smaller than the unity within the filament region, and thus the THz pulse may propagate inside the filament. This hypothesis is supported by further numerical simulation, which demonstrates THz eigenmode inside the plasma filament. |
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来源
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红外与激光工程
,2016,45(4):0402001-1-0402001-7 【核心库】
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DOI
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10.3788/IRLA201645.0402001
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关键词
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飞秒激光
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成丝
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太赫兹波
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超光速传输
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本征模式
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地址
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1.
南开大学现代光学研究所, 光学信息技术科学教育部重点实验室, 天津, 300071
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中国科学院上海高等研究院, 上海, 201210
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中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海, 201800
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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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1007-2276 |
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学科
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物理学 |
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基金
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国家自然科学基金面上项目
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国家973计划
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天津市应用基础与前沿技术研究计划(重点项目)
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文献收藏号
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CSCD:5696978
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参考文献 共
9
共1页
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