High Field Single- to Few-Cycle THz Generation with Lithium Niobate
High Field Single- to Few-Cycle THz Generation with Lithium Niobate
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DOI：
10.3390/photonics8060183
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发表时间：
2021-05
期刊：
影响因子：
2.4
通讯作者：
Xing Zhu;D. R. Bacon;J. Madéo;K. Dani
中科院分区：
文献类型：
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作者：
Xing Zhu;D. R. Bacon;J. Madéo;K. Dani
具有高峰值场的瞬态太赫兹（THz）脉冲已成为物质操纵的重要工具，可实现非线性光谱、粒子加速和高次谐波生成等许多应用。在广泛使用的太赫兹产生技术中，铌酸锂（LN）中的光学整流已成为在低太赫兹频率下实现高场的有力方法，适合探索凝聚态物质系统中的新型非线性现象。在这篇综述中，我们重点介绍闪电网络中单周期到少周期太赫兹的产生，包括基本原理、技术、最新进展和当前的局限性。我们将首先讨论导致切伦科夫辐射的 LN 的相位匹配要求，以及倾斜脉冲前沿 (TPF) 技术。重点将放在TPF技术上，该技术已被证明可以提高太赫兹的产生效率，但仍然存在许多局限性。将系统地讨论用于生产连续和离散 TPF 的不同几何形状。我们总结了当前技术的优点和局限性以及未来的趋势。
The transient terahertz (THz) pulse with high peak field has become an important tool for matter manipulation, enabling many applications such as nonlinear spectroscopy, particle acceleration, and high harmonic generation. Among the widely used THz generation techniques, optical rectification in lithium niobate (LN) has emerged as a powerful method to achieve high fields at low THz frequencies, suitable to exploring novel nonlinear phenomena in condensed matter systems. In this review, we focus on introducing single- to few-cycle THz generation in LN, including the basic principles, techniques, latest developments, and current limitations. We will first discuss the phase matching requirements of LN, which leads to Cherenkov-like radiation, and the tilted pulse front (TPF) technique. Emphasis will be put on the TPF technique, which has been shown to improve THz generation efficiency, but still has many limitations. Different geometries used to produce continuous and discrete TPF will be systematically discussed. We summarize the advantages and limitations of current techniques and future trends.