应急管理部 天津消防研究所 建筑消防工程技术重点实验室, 天津 300381
飞秒激光脉冲在传输过程中, 克尔自聚焦和等离子体散焦相互作用形成了长距离的自导光通道, 该过程称为飞秒激光成丝。飞秒激光成丝在火焰中诱导的荧光辐射为燃烧诊断提供了新的可能性, 为理解燃烧过程、提高燃烧效率和减少污染物的产生提供了有用的信息。针对飞秒激光成丝诱导的荧光辐射在燃烧诊断中的应用, 介绍了飞秒激光在火焰中的传输特性以及成丝动力学过程, 陈述了飞秒激光成丝诱导非线性光谱的机理及其在高温燃烧场诊断应用中的研究现状和进展, 探讨了当前飞秒激光成丝在该领域所面临的挑战和应用前景。
非线性光学 荧光辐射 火焰燃烧诊断 研究进展 nonlinear optics fluorescence radiation diagnosis of flame combustion research progress
Author Affiliations
Abstract
1 School of Science, East China Jiatong University, Nanchang 330013, China
2 School of Science, East China University of Technology, Nanchang 330013, China
3 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.
above-threshold harmonics excited state mid-infrared femtosecond laser High Power Laser Science and Engineering
2017, 5(4): 04000e26
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
We experimentally demonstrate N2+ lasing actions at the wavelengths of 353.3, 353.8, and 354.9 nm using a circularly polarized femtosecond laser. The three laser lines correspond to the B2Σu+(v′=5,4,3)→X2Σg+(v=4,3,2) transitions, respectively. Particularly, we reveal the pressure-dependent gain dynamics of these lasing actions from highly excited vibrational states with a pump–probe scheme. Our experimental results confirm that electron collisional excitation plays an important role in the establishment of a population inversion of N2+ lasing at these wavelengths.
020.2649 Strong field laser physics 320.7150 Ultrafast spectroscopy 320.2250 Femtosecond phenomena Chinese Optics Letters
2015, 13(5): 050201
