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Isolated intense 38 attosecond pulse generation from the combined laser pulse irradiating the coherent superposition state

Chen Ji-Gen Yu Xu-Ping He Long-Jun Xu Yuan-Yuan Yang Yu-Jun

Isolated intense 38 attosecond pulse generation from the combined laser pulse irradiating the coherent superposition state

Chen Ji-Gen, Yu Xu-Ping, He Long-Jun, Xu Yuan-Yuan, Yang Yu-Jun
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  • Received Date:  17 June 2010
  • Accepted Date:  17 July 2010
  • Published Online:  15 May 2011

Isolated intense 38 attosecond pulse generation from the combined laser pulse irradiating the coherent superposition state

  • 1. (1)College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, China; (2)Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China

Abstract: A scheme to efficiently generate an intense short isolated attosecond pulse is presented by the combined laser pulse irradiating the coherent superposition state. The combined pulse is composed of a multi-cycle 800 nm laser and a 1600 nm one. Compared with the case of the fundamental laser irradiating the ground state, the cutoff position is significantly extended from 70th to 280th harmonic, a broadband supercontinuum spectrum with 108 eV spectral width can be produced which directly generates an isolated 38 attosecond pulse, the intensity of which is increased eleven orders of magnitude. Our simulation also shows that the value of the time delay has a large range to keep the isolated sub-50-as pulse generation. Moreover, the value of the time delay in the range between ±0.05π is optinal. This result shows that the scheme appears feasible for an experimental demonstration.

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