|
|||||
|
|
Influence of the intensity gradient upon HHG from free electrons scattered by an intense laser beam |
|
| Authors: | Ankang Li Jiaxiang Wang Na Ren Pingxiao Wang Wenjun Zhu Xiaoya Li Ross Hoehn Sabre Kais |
| Institution: | 1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China 2. Applied Ion Beam Physics Laboratory, Key Laboratory of the Ministry of Education, Shanghai, China 3. Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai, 200433, China 4. National Key Laboratory of Shock Wave and Detonation Physics, Mianyang, 621900, Sichuan, China 5. Departments of Chemistry and Physics, Purdue University, West Lafayette, IN?, 47907, USA 6. Qatar Environment and Energy Research Institute, Qatar Foundation, Doha, Qatar |
| Abstract: | When an electron is scattered by a tightly focused laser beam in vacuum, the intensity gradient is a critical factor to influence the electron dynamics. In this paper, we have further investigated its influence upon the electron high-harmonic generation (HHG) by treating the spacial gradient of the laser intensity as a ponderomotive potential. Based upon perturbative quantum electrodynamics calculations, it has been found that the main effect of the intensity gradient is the broadening of the originally line HHG spectra. A one-to-one relationship can be built between the beam width and the corresponding line width. Hence, this finding may provide us a promising way to measure the beam width of intense lasers in experiments. In addition, for a laser pulse, we have also studied the different influences from transverse and longitudinal intensity gradients upon HHG. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |