Enhanced electron–positron pair creation by the frequency chirped laser pulse

doi:10.1088/1674-1056/22/10/100307

中国物理B ›› 2013, Vol. 22 ›› Issue (10): 100307-100307.doi: 10.1088/1674-1056/22/10/100307

Enhanced electron–positron pair creation by the frequency chirped laser pulse

姜敏, 谢柏松, 桑海波, 李子良

Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

收稿日期:2013-02-22 修回日期:2013-04-17 出版日期:2013-08-30 发布日期:2013-08-30
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11175023) and partially by the Open Fund of National Laboratory of Science and Technology on Computational Physics at Institute of Applied Physics and Computational Mathematics in Beijing.

Enhanced electron–positron pair creation by the frequency chirped laser pulse

Jiang Min (姜敏), Xie Bai-Song (谢柏松), Sang Hai-Bo (桑海波), Li Zi-Liang (李子良)

Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Received:2013-02-22 Revised:2013-04-17 Online:2013-08-30 Published:2013-08-30
Contact: Xie Bai-Song E-mail:bsxie@bnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11175023) and partially by the Open Fund of National Laboratory of Science and Technology on Computational Physics at Institute of Applied Physics and Computational Mathematics in Beijing.

摘要/Abstract

摘要： Based on the quantum Vlasov equation, the effect of frequency chirp on electron-positron pair production is investigated. The cycle parameter, which characterizes the laser field cycle degree within the pulse, is also considered. In both supercycle and subcycle laser pulses the frequency chirp can greatly enhance the momentum distribution function of created pairs and the pair number density. The pair number density created by a supercycle laser pulse is larger than that by a subcycle pulse under the same laser frequency and chirping. There exists an optimal cycle parameter corresponding to the maximum value of the created pair number density for different chirp rates. It is found that the pair number density is sensitive/insensitive to chirping rate when the cycle parameter lies below/above the optimal one.

关键词: electron-positron, quantum nonlocalization, quantum statistics and Vlasov equation, X-ray laser

Abstract: Based on the quantum Vlasov equation, the effect of frequency chirp on electron-positron pair production is investigated. The cycle parameter, which characterizes the laser field cycle degree within the pulse, is also considered. In both supercycle and subcycle laser pulses the frequency chirp can greatly enhance the momentum distribution function of created pairs and the pair number density. The pair number density created by a supercycle laser pulse is larger than that by a subcycle pulse under the same laser frequency and chirping. There exists an optimal cycle parameter corresponding to the maximum value of the created pair number density for different chirp rates. It is found that the pair number density is sensitive/insensitive to chirping rate when the cycle parameter lies below/above the optimal one.

Key words: electron–positron, quantum nonlocalization, quantum statistics and Vlasov equation, X-ray laser

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

05.30.-d (Quantum statistical mechanics) 42.55.Vc (X- and γ-ray lasers)

姜敏, 谢柏松, 桑海波, 李子良. Enhanced electron–positron pair creation by the frequency chirped laser pulse[J]. 中国物理B, 2013, 22(10): 100307-100307.

Jiang Min (姜敏), Xie Bai-Song (谢柏松), Sang Hai-Bo (桑海波), Li Zi-Liang (李子良). Enhanced electron–positron pair creation by the frequency chirped laser pulse[J]. Chin. Phys. B, 2013, 22(10): 100307-100307.

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Enhanced electron–positron pair creation by the frequency chirped laser pulse

Enhanced electron–positron pair creation by the frequency chirped laser pulse

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