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Terahertz radiation generation by three-color laser pulses in air filament

机译：通过空心丝三色激光脉冲的Terahertz辐射产生

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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：我们证明了从空气中的三色激光激发灯丝产生的太赫兹（Thz）辐射，以获得宽调谐范围和泵激光脉冲的各种波长比。作为泵浦源，使用了Femtosecond Ti的辐射：光学参数发生器的蓝宝石激光和红外输出。发现产生的THz脉冲的频谱跨越50至THz，而总体THz的生成效率比在类似配置中由双色脉冲产生的级大的数量级。我们的结果支持三色脉冲更适合于宽带THZ产生的想法，因为相应的波形可以以更大的数量产生更快的游离电子。我们发现转换效率由于强度夹紧而受到显着限制。 THz辐射的光谱扩展由电离事件的非周期性及时解释。通过AIP发布在许可证下发布。

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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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