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Issue 18, 2019
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Enhancing high harmonic generation by the global optimization of a two-color chirped laser field

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Abstract

Enhanced high harmonics are generated by local and global optimization approaches to achieve a supercontinuum spectrum. Based on time-dependent density functional theory calculations, the optimum convolution of a two-color chirped pulse from an N2O molecule implements a significant enhancement of cutoff frequency and high harmonic yield. The optimization is done by controlling the effective chirp parameters and the carrier-envelope phase of the designed laser field. Indeed, all of the effective parameters are adjusted simultaneously for the global optimization; whereas, just two variables are tuned to obtain the desired cutoff frequency based on the local optimization. The results show that the global optimization approach extends the cutoff frequency by 96% compared to the single-color field, which could produce an isolated 25 as output pulse. This method opens up a valuable route by a pulse shaping mechanism for the control of high harmonic generation and ultrafast measurements for reducing the computational time and repeatability of an experiment with high accuracy.

Graphical abstract: Enhancing high harmonic generation by the global optimization of a two-color chirped laser field

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Publication details

The article was received on 13 Dec 2018, accepted on 19 Mar 2019 and first published on 06 Apr 2019


Article type: Paper
DOI: 10.1039/C8CP07619G
Phys. Chem. Chem. Phys., 2019,21, 9302-9309

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    Enhancing high harmonic generation by the global optimization of a two-color chirped laser field

    M. Mofared, E. Irani and R. Sadighi-Bonabi, Phys. Chem. Chem. Phys., 2019, 21, 9302
    DOI: 10.1039/C8CP07619G

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