Generation of an isolated few-attosecond pulse in optimized inhomogeneous two-color fields

Yi Chou, Peng-Cheng Li, Tak-San Ho, and Shih-I Chu

Phys. Rev. A 92, 023423 – Published 28 August 2015

Abstract

We present a numerical study for optimization of ultrabroad supercontinuum spectrum by controlling the waveforms of laser fields, with the ultimate goal to generate isolated ultrashort attosecond pulses. Specifically, we extend a derivative-free nonconvex optimization algorithm for maximization of the supercontinnum power spectrum near the high-order harmonic generation (HHG) cutoff. It is found that optimally shaped inhomogeneous two-color mid-infrared laser fields can greatly enhance and extend the high-order harmonic generation plateau. Wavelet time-frequency analysis and classical simulations show that the superposition of resulting hydrogen HHG supercontinuum effectively gives rise to a robust isolated 5-as pulse.

Received 28 May 2015

DOI:https://doi.org/10.1103/PhysRevA.92.023423

Authors & Affiliations

Yi Chou^1,*, Peng-Cheng Li^1,2,†, Tak-San Ho^3,‡, and Shih-I Chu^1,4,§

¹Center for Quantum Science and Engineering, Department of Physics, and Center for Advanced Study in Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan
²College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
³Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
⁴Department of Chemistry, University of Kansas, Kansas 66045, USA

^*r00222008@ntu.edu.tw
^†lipc@nwnu.edu.cn
^‡tsho@princeton.edu
^§sichu@ku.edu

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Vol. 92, Iss. 2 — August 2015

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