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首页> 外文期刊>Laser & Photonics Reviews >Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications
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Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications

机译：飞秒光脉冲引起的气体等离子体的宽带太赫兹发射：从基础到应用

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摘要

We review the generation of broadband THz radiation from femtosecond photo-induced gas plasmas, with an emphasis on the highly efficient “AC-bias” case where the plasma is generated and driven by a superposition of fundamental and second-harmonic optical fields. The dependence on experimental parameters such as pulse energy, air pressure, polarization and focusing are presented, and compared to the predictions from semi-quantitative models for the THz generation process, namely (i) a microscopic photocurrent model and (ii) a four-wave mixing model. We also employ these models to the case of few-cycle pulses, where the observed THz emission is related directly to the carrier-envelope phase of the pulses, and hence provides a mechanism with which to measure this phase.}
机译：我们回顾了飞秒光诱导气体等离子体产生宽带太赫兹辐射的过程，重点介绍了高效的“ AC偏置”情况，其中等离子体是由基本和二次谐波光学场的叠加产生并驱动的。提出了对实验参数（如脉冲能量，气压，极化和聚焦）的依赖性，并将其与太赫兹生成过程的半定量模型（即（i）微观光电流模型和（ii）四个波混合模型。对于少数周期脉冲的情况，我们也采用了这些模型，其中观察到的THz发射与脉冲的载波包络相位直接相关，因此提供了一种测量该相位的机制。}

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