Optical rectification in 4H-SiC: paving the way to generate strong terahertz fields with ultra-wide bandwidth

IF 5.2 1区物理与天体物理 Q1 OPTICS

High Power Laser Science and Engineering Pub Date : 2023-06-20 DOI:10.1017/hpl.2023.52

Fangjie Li, K. Zhong, Yiwen Zhang, Tong Wu, Yuxin Liu, Hongzhan Qiao, Jining Li, Degang Xu, Jianquan Yao

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引用次数: 0

Abstract

Abstract The 4H-SiC crystal is found to have great potential in terahertz generation via nonlinear optical frequency conversion due to its extremely high optical damage threshold, wide transparent range, etc. In this paper, optical rectification (OR) with tilted-pulse-front (TPF) setting based on the 4H-SiC crystal is proposed. The theory accounts for the optimization of incident pulse pre-chirping in the TPF OR process under high-intensity femtosecond laser pumping. Compared with the currently recognized LiNbO3-based TPF OR, which generates a single-cycle terahertz pulse within 3 THz, 4H-SiC demonstrates a significant advantage in producing ultra-widely tunable (up to over 14 THz, TPF angle 31°–38°) terahertz waves with high efficiency (~10–2) and strong field (~MV/cm). Besides, the spectrum characteristics, as well as the evolution from single- to multi-cycle terahertz pulses can be modulated flexibly by pre-chirping. The simulation results show that 4H-SiC enables terahertz frequency extending to an unprecedent range by OR, which has extremely important potential in strong-field terahertz applications.

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4H-SiC中的光学整流:为产生超宽带强太赫兹场铺平了道路

摘要:4H-SiC晶体具有极高的光损伤阈值、宽的透明范围等特点，在太赫兹非线性光变频产生中具有很大的应用潜力。本文提出了一种基于4H-SiC晶体的倾斜脉冲前(TPF)设置的光学整流(OR)方法。该理论解释了高强度飞秒激光抽运TPF OR过程中入射脉冲预啁啾的优化问题。与目前公认的基于linbo3的TPF OR产生3太赫兹内的单周期太赫兹脉冲相比，4H-SiC在产生超宽可调谐(高达14太赫兹以上，TPF角31°-38°)的太赫兹波方面具有显著优势，具有高效率(~ 10-2)和强场(~MV/cm)。此外，通过预啁啾可以灵活地调制太赫兹脉冲的频谱特性以及从单周期到多周期的演变过程。仿真结果表明，4H-SiC使太赫兹频率通过OR扩展到前所未有的范围，在强场太赫兹应用中具有极其重要的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Power Laser Science and Engineering Physics and Astronomy-Nuclear and High Energy Physics

CiteScore

7.10

自引率

4.20%

发文量

401

审稿时长

21 weeks

期刊介绍： High Power Laser Science and Engineering (HPLaser) is an international, peer-reviewed open access journal which focuses on all aspects of high power laser science and engineering. HPLaser publishes research that seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications and laser components. Topics covered include laser-plasma interaction, ultra-intense ultra-short pulse laser interaction with matter, attosecond physics, laser design, modelling and optimization, laser amplifiers, nonlinear optics, laser engineering, optical materials, optical devices, fiber lasers, diode-pumped solid state lasers and excimer lasers.