Author Affiliations
Abstract
1 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 Osaka University, Osaka 565-0871, Japan
In this Letter, we experimentally explore the pulse-contrast degradation caused by surface reflection in optical parameter chirped-pulse amplification. Different pump-to-signal conversion efficiencies and post-pulses with different intensities are obtained by changing the seed-pulse or pump-pulse energy and inserting etalons with different reflection coefficients, respectively. The contrast measurements show that the generated first pre-pulse intensity is proportional to the product of the surface reflection intensity ratio and the square of the pump-to-signal conversion efficiency.
190.4410 Nonlinear optics, parametric processes Chinese Optics Letters
2018, 16(5): 053201
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 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
We experimentally investigate the evolution of the terahertz (THz) waveform and polarization state inside the plasma filament produced by orthogonally polarized two-color pulses. We find that the variation of the THz polarization state along the plasma column is dominantly caused by the relative phase difference and spectra blue shift of the two-color field. Elliptically polarized THz radiation is generated by controlling the initial relative phase and the filament length. The result indicates the coherent control of the polarization state of the THz emission.
040.2235 Far infrared or terahertz 260.5210 Photoionization 320.7110 Ultrafast nonlinear optics 350.5400 Plasmas Chinese Optics Letters
2016, 14(9): 093201
1 中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
2 同济大学物理系, 上海 200092
超短激光脉冲驱动等离子体光丝产生太赫兹辐射的研究对于揭示太赫兹产生的微观机理以及太赫兹源的发展和应用有重要的基础意义。系统介绍了包括载波包络稳定的红外周期量级激光脉冲的产生、基于周期量级激光强场驱动等离子体光丝产生太赫兹辐射的机理、等离子体光丝中周期量级光场的传输、波形可控太赫兹辐射的产生及其在载波包络相位测量技术上的应用等方面的最新进展。
非线性光学 等离子体 太赫兹辐射 周期量级脉冲 载波包络相位 激光与光电子学进展
2013, 50(8): 080004
