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首页> 外文会议>Nonlinear Optics and Its Applications VIII; and Quantum Optics III >Electrical nonlinear response of a photomixer for applications in ultrafast measurements
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Electrical nonlinear response of a photomixer for applications in ultrafast measurements

机译：用于超快测量的光混合器的电气非线性响应

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摘要

Electrical nonlinear response of a low-temperature-grown GaAs photomixer is exploited for THz-wave modulation, detection and waveform sampling. Current-voltage response at low bias field is modelled by electron drift velocity saturation. THz-wave rectification is discussed in a small-signal approximation and experimentally addressed in connection with the curvature of IV plot. The optical heterodyne signal from two lasers down-converted with the photomixer is modulated by applying an alternative bias field. Conversely, heterodyne detection of a continuous-wave THz source is demonstrated with the photomixer using the optical beat between the lasers as local oscillator. Alternatively, THz-waves with tunable carrier and pulse repetition rate are generated with a THz frequency multiplier driven by a pulsed microwave synthesizer. Asynchronous optical sampling with a pulsed optical beat is demonstrated with the heterodyne detection scheme.
机译：低温生长的GaAs光混合器的电非线性响应被用于太赫兹波调制，检测和波形采样。低偏置磁场下的电流-电压响应通过电子漂移速度饱和来建模。太赫兹波整流在小信号近似中进行了讨论，并结合IV曲线的曲率进行了实验研究。来自两个用光混合器下变频的激光器的光学外差信号通过施加替代偏置场进行调制。相反，使用激光之间的光拍作为本地振荡器的光混频器证明了连续波太赫兹源的外差检测。或者，利用由脉冲微波合成器驱动的太赫兹倍频器产生具有可调载波和脉冲重复频率的太赫兹波。外差检测方案证明了具有脉冲光学拍的异步光学采样。

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