太赫兹波的非共轭电光探测:优势和局限性

M. Kurnikov, M. Bakunov
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引用次数: 0

摘要

通过在电光晶体中以非共线方式传播飞秒激光脉冲,对太赫兹波进行电光采样,与传统的共线方案不同,这种方法可以在各种类型的晶体和激光波长下实现高效率和高光谱分辨率的太赫兹探测。我们提出了非共轭电光采样探测技术的分析理论,该理论描述了光场和太赫兹场之间的非线性相互作用对探测激光束偏振的调制。该理论考虑了太赫兹光束和探测光束的有限宽度。研究发现,非共轭方案可用作低通太赫兹滤波器,其频率截止由探测光束的宽度以及太赫兹光束和探测光束的交叉角决定。我们将该理论应用于两种实际情况:在砷化镓晶体中利用光纤激光脉冲(波长 1.55 μm)对太赫兹波进行采样,以及在氧化铌锂晶体中利用钛:蓝宝石激光脉冲(波长 800 nm)进行采样。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Noncollinear electro-optic detection of terahertz waves: Advantages and limitations
Electro-optic sampling of terahertz waves by noncollinearly propagating femtosecond laser pulses in electro-optic crystals can provide high efficiency and high spectral resolution of terahertz detection with various types of crystals and laser wavelengths, unlike the conventional collinear scheme. We develop an analytical theory of noncollinear electro-optic sampling detection technique that describes the modulation of the probe laser beam polarization as a result of nonlinear interaction between the optical and terahertz fields. The theory accounts for finite widths of the terahertz and probe beams. It is found that noncollinear scheme operates as a low-pass terahertz filter with the frequency cut-off determined by the width of the probe beam and the crossing angle of the terahertz and probe beams. We apply the theory to two practical situations: sampling of terahertz waves by fiber laser pulses (1.55 μm wavelength) in a GaAs crystal and sampling by Ti:sapphire laser pulses (800 nm wavelength) in a LiNbO3 crystal.
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