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首页> 外文期刊>Journal of Applied Physics >Terahertz radiation generation by three-color laser pulses in air filament
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Terahertz radiation generation by three-color laser pulses in air filament

机译：空气丝中的三色激光脉冲产生太赫兹辐射

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摘要

We demonstrated terahertz (THz) radiation generated from a three-color laser-excited filament in air for a wide tuning range and various wavelength ratios of the pump laser pulses. As a pump source, the radiation of the femtosecond Ti: sapphire laser and infrared output of the optical parametric generator were used. It was found that the spectrum of generated THz pulses spans up to 50 THz, while the overall THz generation efficiency is of an order of magnitude larger than the one produced by two-color pulses in an analogous configuration. Our results support the idea that three-color pulses are more suitable for broadband THz generation, since the corresponding waveforms can produce faster free electrons in larger quantities. We have found that the conversion efficiency is significantly limited due to intensity clamping. The spectral broadening of THz radiation is explained by aperiodicity of ionization events in time. Published under license by AIP Publishing.
机译：我们展示了三色激光激发灯丝在空气中产生的太赫兹（THz）辐射，具有很宽的调谐范围和泵浦激光脉冲的各种波长比。飞秒Ti：蓝宝石激光的辐射和光学参量发生器的红外输出用作泵浦源。已经发现，所产生的太赫兹脉冲的频谱跨度高达50 THz，而总的太赫兹产生效率比类似配置中的两种颜色的脉冲所产生的效率大一个数量级。我们的结果支持这样的想法，即三色脉冲更适合于宽带太赫兹的产生，因为相应的波形可以大量产生更快的自由电子。我们发现，由于强度钳制，转换效率受到极大限制。太赫兹辐射的光谱展宽可以通过电离事件在时间上的非周期性来解释。由AIP Publishing授权发布。

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  • 来源
    《Journal of Applied Physics》 |2019年第17期|173103.1-173103.9|共9页
  • 作者

    Vaicaitis V.; Balachninaite O.; Morgner U.; Babushkin I.;

  • 作者单位

    Vilnius Univ, Laser Res Ctr, Sauletekio 10, LT-10223 Vilnius, Lithuania;

    Vilnius Univ, Laser Res Ctr, Sauletekio 10, LT-10223 Vilnius, Lithuania;

    Leibniz Univ Hannover, Inst Quantum Opt, D-30167 Hannover, Germany|Cluster Excellence PhoenixD Photon Opt & Engn Inn, D-30167 Hannover, Germany;

    Leibniz Univ Hannover, Inst Quantum Opt, D-30167 Hannover, Germany|Cluster Excellence PhoenixD Photon Opt & Engn Inn, D-30167 Hannover, Germany|Max Born Inst, D-10117 Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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