中国激光, 2020, 47(5): 0500003, 网络出版: 2020-05-01

超快激光成丝现象研究综述

Research Progress on Ultrafast Laser Filamentation
作者单位

1南开大学现代光学研究所天津市微尺度光学信息技术科学重点实验室, 天津 300350

摘要
超快激光成丝是高功率超快激光在透明光学介质中传输时出现的一种独特非线性光学现象,所产生长度远超共焦范围的离子体通道被称为光丝;同时伴随超连续谱产生、荧光辐射和受激放大、脉冲自压缩等丰富的光学效应,在大气遥感、超快激光技术、人工干预天气、激光超精细加工等方面具有广泛应用前景。本文对成丝现象研究的历史发展进行了简单介绍,包括实验技术、基本物理机制和调控方法的主要研究进展,并对成丝在大气远程应用、物理化学机制、强THz波产生等方面的研究所面临的挑战进行了展望。
Abstract
Ultrafast laser filamentation is a unique nonlinear optical phenomenon that occurs during high-power ultrafast laser propagation in transparent optical media. In filamentation, a plasma channel, whose length can exceed the confocal length limit, is generated and referred to as filament. Following filamentation, very rich optical effects, such as supercontinuum generation, super clean fluorescence emission and amplification, and self-pulse compression, occur. The applications of this filamentation in various domains, ranging from remote sensing to ultrafast laser technology, weather control, laser fabrication, etc., have also been highly anticipated. This review gives a brief introduction of the history of the study of filamentation, including the research progress in experimental techniques, fundamental physics, and control methods. Furthermore, future challenges for the application of filamentation in several representative directions, for example, atmospheric long-distance propagation dynamics, physical chemistry inside filaments, and optimization of THz generation, are highlighted.
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