Role of the Porras factor in phase matching of high-order harmonic generation driven by focused few-cycle laser pulses

Tang, Xiangyu; Li, Baochang; Wang, Kan; Yin, Zhiming; Zhang, Chi; Guan, Zhong; Wang, Bincheng; Lin, C. D.; Jin, Cheng

doi:10.1364/ol.494201

Role of the Porras factor in phase matching of high-order harmonic generation driven by focused few-cycle laser pulses

Journal Article · 01 January 2023 · Optics Letters

DOI:https://doi.org/10.1364/ol.494201· OSTI ID:2419292

Tang, Xiangyu ^[1]; Li, Baochang; Wang, Kan; Yin, Zhiming; Zhang, Chi; Guan, Zhong; Wang, Bincheng; ;

OSTI

We investigate the role of the Porras factor (or laser focusing effect) on the macroscopic high-order harmonic generation (HHG) driven by a focused broadband few-cycle laser beam. By employing a non-adiabatic phase-matching analysis method, we reveal that phase mismatch due to the induced-dipole phase varies with the Porras factor, which is dominant in phase matching at low gas pressure. We also find that in a strongly ionized medium when gas pressure is high, the nonlinear propagation is dominated by a plasma effect such that the focusing effect is mitigated, resulting in similar poor phase matching of HHG regardless of the Porras factor. Our results are expected to assist experimentalists identifying optimal conditions for HHG using ultrashort laser pulses.

Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-86ER13491

OSTI ID:: 2419292

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 14 Vol. 48; ISSN OPLEDP; ISSN 0146-9592

Publisher:: Optical Society of America (OSA)

Country of Publication:: United States

Language:: English

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