Nagoya University, Nagoya, Japan.
Opt Lett. 2013 May 15;38(10):1654-6. doi: 10.1364/OL.38.001654.
Cherenkov phase-matched terahertz (THz) wave generation from a MgO:LiNbO3 ridge waveguide was studied using optical rectification. Pumping was achieved using 20 and 60 fs laser pulses from a fiber laser centered at 1.56 μm. Time-domain spectroscopy (TDS) results showed a single-cycle pulse with 20 fs pulse pumping and a near-single-cycle pulse with 60 fs pulse pumping. The spectrum covered the range of 0.1-7 THz, with a signal-to-noise ratio of over 50 dB. The output power measured by a Si bolometer and a deuterated triglycine sulfate pyroelectric detector is shown and compared to that of a commercial photoconductive antenna. This system is believed to be a promising THz source for low-cost, compact, robust, and highly integrated TDS, THz imaging, and tomography systems.
利用光整流研究了 MgO:LiNbO3 脊形波导中的切伦科夫相位匹配太赫兹（THz）波产生。泵浦采用中心波长为 1.56 μm 的光纤激光器的 20 和 60 fs 激光脉冲实现。时域光谱（TDS）结果显示，20 fs 脉冲泵浦产生单周期脉冲，60 fs 脉冲泵浦产生近单周期脉冲。光谱覆盖 0.1-7 THz 范围，信噪比超过 50 dB。通过硅热释电探测器和掺氘三甘氨酸硫酸盐测辐射热计测量输出功率，并与商业光导天线进行比较。该系统有望成为低成本、紧凑、稳健和高度集成的 TDS、THz 成像和层析成像系统的有前途的太赫兹源。
