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Time-frequency signal processing of terahertz pulses

机译:太赫兹脉冲的时频信号处理

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摘要

We demonstrate that some signal-processing techniques, such as the fractional Fourier transform and the spectrogram, which are known to be effective for optical signals, can be implemented at terahertz frequencies and with available terahertz devices. These techniques, contrary to the frequency-resolved optical-gating method for pulse characterization, do not require nonlinear media, which do not exist at terahertz frequencies. Thus the fractional Fourier transform or the spectrogram offers the only possibility of characterizing terahertz pulses simultaneously in time and frequency.
机译:我们证明了某些信号处理技术(例如分数傅里叶变换和频谱图)对光信号有效,可以在太赫兹频率和可用的太赫兹设备上实现。这些技术与用于脉冲表征的频率分辨光学选通方法相反,它们不需要非线性介质,而在太赫兹频率下不存在这种介质。因此,分数阶傅里叶变换或频谱图提供了在时间和频率上同时表征太赫兹脉冲的唯一可能性。

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