Generation of an isolated few-attosecond pulse in optimized inhomogeneous two-color fields
Journal
Physical Review A - Atomic, Molecular, and Optical Physics
Journal Volume
92
Journal Issue
2
Date Issued
2015
Author(s)
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.
SDGs
Type
journal article