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Isolated sub-100-as pulse generation by optimizing two-color laser fields using simulated annealing algorithm.

Li Zheng1, Songsong Tang, Xianfeng Chen

  • 1Department of Physics, the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240, China.

Optics Express
|January 23, 2009
PubMed
Summary
This summary is machine-generated.

We optimized two-color laser fields to broaden high harmonic generation (HHG) cut-off regions. This method achieved a wider XUV supercontinuum and generated isolated attosecond pulses without phase compensation.

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Area of Science:

  • Quantum optics
  • Attosecond science
  • Nonlinear optics

Background:

  • High harmonic generation (HHG) is a key process for producing extreme ultraviolet (XUV) radiation.
  • Broadening the HHG cut-off region is crucial for generating shorter attosecond pulses.
  • Current methods often require complex phase compensation techniques.

Purpose of the Study:

  • To develop a method for broadening the cut-off region in high harmonic generation.
  • To optimize laser parameters for enhanced XUV supercontinuum generation.
  • To achieve isolated attosecond pulse generation without post-compression.

Main Methods:

  • Utilizing two-color laser fields: an intense 5 fs pulse at 800 nm and a weaker subharmonic pulse at 2400 nm.
  • Employing the Simulated Annealing (SA) algorithm for parameter optimization.
  • Optimizing electric field amplitude, control pulse duration, and inter-pulse time delay.

Main Results:

  • Achieved a broadened XUV supercontinuum with a 115 eV spectral width.
  • The generated spectral width is double that of unoptimized conditions.
  • Successfully generated an isolated 76 attosecond pulse without phase compensation.

Conclusions:

  • The proposed method effectively broadens the HHG cut-off region.
  • Optimized two-color laser fields enable efficient XUV supercontinuum generation.
  • This approach provides a direct route to isolated attosecond pulse generation.