由放大器驱动的大面积光电导天线产生的具有高电场的脉冲太赫兹辐射。

Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna.

作者信息

Beck M, Schäfer H, Klatt G, Demsar J, Winnerl S, Helm M, Dekorsy T

机构信息

Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457 Konstanz, Germany.

出版信息

Opt Express. 2010 Apr 26;18(9):9251-7. doi: 10.1364/OE.18.009251.

DOI:10.1364/OE.18.009251

PMID:20588772

Abstract

We report on the generation of impulsive terahertz (THz) radiation with 36 kV/cm vacuum electric field (1.5 mW average thermal power) at 250 kHz repetition rate and a high NIR-to-THz conversion efficiency of 2 x 10(-3). This is achieved by photoexciting biased large-area photoconductive emitter with NIR fs pulses of microJ pulse energy. We demonstrate focussing of the THz beam by tailoring the pulse front of the exciting laser beam without any focussing element for the THz beam. A high dynamic range of 10(4) signal-to-noise is obtained with an amplifier based system.

摘要

我们报道了在250千赫兹重复频率下产生具有36千伏/厘米真空电场（平均热功率为1.5毫瓦）且近红外到太赫兹转换效率高达2×10⁻³的脉冲太赫兹（THz）辐射。这是通过用微焦脉冲能量的近红外飞秒脉冲光激发偏置的大面积光电导发射器来实现的。我们展示了在没有任何太赫兹光束聚焦元件的情况下，通过调整激发激光束的脉冲前沿来聚焦太赫兹光束。基于放大器的系统获得了高达10⁴的高动态范围信噪比。