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在电磁波谱中所处的特殊位置使得THz波在物理、化学、生物医学、电子科学、材料科学、环境监测等领域有着广泛的应用前景。讨论了THz时域频谱技术的若干关键问题:THz发射晶体的双光子吸收、衍射效应和非线性效应(Kerr效应和类Kerr效应)等对THz产生效率的影响,THz辐射脉冲的载波包络相位差,THz小波变换频谱技术,以及利用光子晶体光纤飞秒激光作为激发源对THz时域频谱系统进行小型化和提高能量的方案。
The special position in the electromagnetic spectrum makes the THz wave have a wide range of applications in the fields of physics, chemistry, biomedicine, electronic science, materials science and environmental monitoring. The key issues of THz time-domain spectroscopy are discussed: the influence of two-photon absorption, diffraction and nonlinear effects (Kerr effect and Kerr-like effect) of THz emission crystal on the THz generation efficiency, the carrier envelope phase of THz radiation pulse THz wavelet transform spectrum technique, and the scheme of miniaturizing and increasing the THz time-frequency spectrum system by using the photonic crystal fiber femtosecond laser as an excitation source.