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

Mofared, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1039/c8cp07619g
  3. Publisher: Royal Society of Chemistry , 2019
  4. Abstract:
  5. 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. © 2019 the Owner Societies
  6. Keywords:
  7. Harmonic Generations ; Time-Dependent Schrodinger Equation ; Phase Matching
  8. Source: Physical Chemistry Chemical Physics ; Volume 21, Issue 18 , 2019 , Pages 9302-9309 ; 14639076 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2019/cp/c8cp07619g