Extended phase matching of high harmonic generation by plasma-induced defocusing

Sun, Hung-Wei; Huang, Pei-Chi; Tzeng, Yi-Hsuan; Huang, Jen-Ting; Lin, C. D.; Jin, Cheng; Chen, Ming-Chang

doi:10.1364/OPTICA.4.000976

Title: Extended phase matching of high harmonic generation by plasma-induced defocusing

Journal Article · Sun Jan 01 00:00:00 EST 2017 · Optica

DOI:https://doi.org/10.1364/OPTICA.4.000976· OSTI ID:1465168

Sun, Hung-Wei ^[1]; Huang, Pei-Chi ^[2]; Tzeng, Yi-Hsuan ^[1]; Huang, Jen-Ting ^[1]; Lin, C. D. ^[3]; Jin, Cheng ^[4]; Chen, Ming-Chang ^[5]

National Tsing Hua Univ., Hsinchu (Taiwan). Inst. of Photonics Technologies
National Tsing Hua Univ., Hsinchu (Taiwan). Inst. of Photonics Technologies; Adademia Sinica, Taipei (Taiwan). Inst. of Atomic and Molecular Sciences
Kansas State Univ., Manhattan, KS (United States). J. R. Macdonald Lab.; National Tsing Hua Univ., Hsinchu (Taiwan)
Nanjing Univ. (China). Dept. of Applied Physics
National Tsing Hua Univ., Hsinchu (Taiwan). Inst. of Photonics Technologies and Dept. of Physics

High-harmonic generation (HHG) of femtosecond lasers produces unique short-wavelength light pulses with femtosecond to attosecond duration. However, free electrons in the partially ionized gas medium are known to prevent phase matching and limit upconversion to low-energy harmonics only. We have demonstrated experimentally and theoretically an unconventional phase-matching scheme: extending the HHG phase matching cutoff by controlling the rapid self-defocusing effect of the driving laser. This method takes advantage of the additional intrinsic atomic dipole phase mismatch introduced by the rapid laser defocusing. This phase can be precisely controlled by adjusting the aperture of a simple iris, which truncates the input beam, to correctly compensate free-electron dispersion, resulting in tunable harmonic energy and phase matching cutoff extension. Based on this approach, we report experimental observation of extending the harmonic cutoff energy in Ar to ~65 eV with a 400-fold increase in conversion efficiency using a tightly focused truncated Gaussian beam in a short high-pressure gas cell. This new defocusing-assisted phase matching in a highly ionized gas medium can be applied to different targets, laser wavelengths, and pulse durations to extend harmonic upconversion to higher cutoff energy with higher efficiency.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: FG02-86ER13491

OSTI ID:: 1465168

Journal Information:: Optica, Vol. 4, Issue 8; ISSN 2334-2536

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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Influence of the polarization of a multielectron atom in a strong laser field on high-order harmonic generation Romanov, A. A.; Silaev, A. A.; Frolov, M. V. Physical Review A, Vol. 101, Issue 1 https://doi.org/10.1103/physreva.101.013435	journal	January 2020
Extension of water-window harmonic cutoff by laser defocusing-assisted phase matching Jin, Cheng; Chen, Ming-Chang; Sun, Hung-Wei Optics Letters, Vol. 43, Issue 18 https://doi.org/10.1364/ol.43.004433	journal	January 2018
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