High Power Laser Science and Engineering, 2014, 2 (1): 010000e7, Published Online: Dec. 26, 2014
Electromagnetic radiation from laser wakefields in underdense plasma Download: 620次
Abstract
It is demonstrated by simulations and analysis that a wakefield driven by an ultrashort intense laser pulse in underdense plasma can emit tunable electromagnetic radiation along the laser propagation direction. The profile of such a kind of radiation is closely associated with the structure of the laser wakefield. In general, electromagnetic radiation in the terahertz range with its frequency a few times the electron plasma frequency can be generated in the moderate intensity regime. In the highly nonlinear case, a chain of radiation pulses is formed corresponding to the nonlinear structure of the wake. Study shows that the radiation is associated with the self-modulation process of the laser pulse in the wakefield and resulting transverse electron momenta from modulated asymmetric laser fields.
Yue Liu, Wei-Min Wang, Zheng-Ming Sheng. Electromagnetic radiation from laser wakefields in underdense plasma[J]. High Power Laser Science and Engineering, 2014, 2(1): 010000e7.