Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.
Sensors (Basel). 2011;11(1):32-53. doi: 10.3390/s110100032. Epub 2010 Dec 23.
Powerful femtosecond laser pulses propagating in transparent materials result in the formation of self-guided structures called filaments. Such filamentation in air can be controlled to occur at a distance as far as a few kilometers, making it ideally suited for remote sensing of pollutants in the atmosphere. On the one hand, the high intensity inside the filaments can induce the fragmentation of all matters in the path of filaments, resulting in the emission of characteristic fluorescence spectra (fingerprints) from the excited fragments, which can be used for the identification of various substances including chemical and biological species. On the other hand, along with the femtosecond laser filamentation, white-light supercontinuum emission in the infrared to UV range is generated, which can be used as an ideal light source for absorption Lidar. In this paper, we present an overview of recent progress concerning remote sensing of the atmosphere using femtosecond laser filamentation.
强飞秒激光脉冲在透明材料中传播会导致自导结构的形成，这种自导结构被称为光丝。在空气中，这种光丝可以在几公里远的地方被控制形成，这使得它非常适合用于遥感大气中的污染物。一方面，光丝内部的高强度可以诱导光丝路径上所有物质的碎裂，从而从激发的碎片中发射出特征荧光光谱（指纹），可用于识别包括化学和生物物种在内的各种物质。另一方面，随着飞秒激光光丝的产生，会在红外到紫外范围内产生白光超连续谱发射，可作为吸收激光雷达的理想光源。在本文中，我们概述了使用飞秒激光光丝进行遥感探测大气的最新进展。
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