Generation of an XUV supercontinuum by optimization of the angle between polarization planes of two linearly polarized pulses in a multicycle two-color laser field

Jinping Yao, Yao Li, Bin Zeng, Hui Xiong, Han Xu, Yuxi Fu, Wei Chu, Jielei Ni, Xiaojun Liu, J. Chen, Ya Cheng, and Zhizhan Xu

Phys. Rev. A 82, 023826 – Published 30 August 2010

Abstract

We theoretically investigate the high-order harmonic generation (HHG) in helium using a two-color laser field synthesized by an intense 25-fs laser pulse at 800 nm and a relatively weak $~ 43 − fs$ laser pulse at 1400 nm. When the polarization between the two pulses is arranged at an angle of $~ 73^{°}$ , supercontinuum spectra are dramatically broadened to 180 eV, which is sufficient to support an isolated ∼73-as pulse without any phase compensation. The physical mechanisms behind the phenomenon are well explained in terms of quantum and classical analyses. Furthermore, in the long-pulse regime, this method of extending the supercontinuum spectrum shows the significant advantage over previous two-color HHG schemes.

Received 30 June 2010

DOI:https://doi.org/10.1103/PhysRevA.82.023826

Authors & Affiliations

Jinping Yao^1,2, Yao Li³, Bin Zeng^1,2, Hui Xiong¹, Han Xu¹, Yuxi Fu^1,2, Wei Chu^1,2, Jielei Ni^1,2, Xiaojun Liu⁴, J. Chen^5,6,*, Ya Cheng^1,†, and Zhizhan Xu^1,‡

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, China
²Graduate University of Chinese Academy of Sciences, Beijing 100049, China
³Department of Physics, East China Normal University, Shanghai 200062, China
⁴State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
⁵Center for Applied Physics and Technology, Peking University, Beijing 100084, China
⁶Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

^*chen_jing@iapcm.ac.cn
^†ycheng-45277@hotmail. com
^‡zzxu@mail.shcnc.ac.cn

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Issue

Vol. 82, Iss. 2 — August 2010

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