Optical Terahertz Sources Based on Difference Frequency Generation in Nonlinear Crystals
Optical Terahertz Sources Based on Difference Frequency Generation in Nonlinear Crystals
复制标题
基于非线性晶体差频生成的太赫兹光学光源
DOI：
10.3390/cryst12070936
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发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
Ze Zhang
中科院分区：
文献类型：
--
作者：
Yang Liu;K. Zhong;A. Wang;Mengchen Zhou;Shanchuan Li;Lu Gao;Ze Zhang
太赫兹（THz）光源介于微波和红外波段之间，频率范围为0.1 ~ 10 THz，在光谱探测、医学成像、通信等领域有着重要的应用。差频产生（DFG）是一种有效的产生太赫兹的方法，具有成本低、结构简单、调谐范围宽、无阈值、可室温工作等特点。本文综述了基于非线性晶体的各种光学太赫兹差频源，包括无机晶体差频源、有机晶体差频源、准相位匹配（QPM）晶体差频源、波导差频源、腔增强差频源和级联差频源。他们最近的进展，以及他们的优点和缺点，是充分目前和讨论。本文旨在为该领域的研究人员提供全面的参考，并快速了解利用非线性晶体产生差频的光学太赫兹源。
Terahertz (THz) sources, ranging from 0.1 THz to 10 THz, between microwaves and infrared waves, have important applications in spectral detection, medical imaging, communication, etc. Difference frequency generation (DFG) is an effective method for generating terahertz with the characteristics of low cost, simple structure, widely tunable range, no threshold, and room-temperature operation. This paper reviews various optical terahertz sources of difference frequency generation based on nonlinear crystals, including DFG with inorganic crystals, DFG with organic crystals, DFG with quasi-phase-matching (QPM) crystals, DFG in waveguides, cavity-enhanced DFG, and cascaded DFG. Their recent advances, as well as their advantages and disadvantages, are fully present and discussed. This review is expected to provide a comprehensive reference for researchers in this field and a quick understanding of optical THz sources of difference frequency generation with nonlinear crystals.