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Title: Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic

Abstract

We systematically study the efficiency enhancement of high-harmonic generation (HHG) in an Ar gas cell up to the soft X-ray (SXR) range using a two-color laser field composed of 2.1 μm (ω) and 700 nm (3ω) with parallel linear polarization. Our experiment follows the recent theoretical investigations that determined two-color mid-infrared (IR) pulses, mixed with their third harmonic (ω + 3ω), to be close to optimal driving waveforms for enhancing HHG efficiency in the SXR region [Jin et al., Nature Comm. 5, 4003 (2014)]. We observed sub-optical-cycle-dependent efficiency enhancements of up to 8.2 of photon flux integrated between 20 – 70 eV, and up to 2.2 between 85 – 205 eV. Enhancement of HHG efficiency was most pronounced for the lowest tested backing pressure (≈ 140 mbar), and decreased monotonically as the pressure was increased. The single-color (ω)-driven HHG was optimal at the highest backing pressure tested in the experiment (≈ 375 mbar). Our numerical simulations based on single-atom response and 3D pulse propagation show good qualitative agreement with experimental observations. The lower enhancement at high pressure and higher photon energy indicates that phase matching of two-color-driven HHG is more sensitive to ionization rate and pulse propagation effects than themore » single-color case. We show that with further improvements to the relative phase jitter and the spatio-temporal overlap of the two beams, the efficiency enhancement could be further improved by at least a factor of ≈ 2.« less

Authors:
ORCiD logo; ORCiD logo; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Alabama, Birmingham, AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1454671
Alternate Identifier(s):
OSTI ID: 1503245
Grant/Contract Number:  
SC0018378
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 26 Journal Issue: 13; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Kroh, Tobias, Jin, Cheng, Krogen, Peter, Keathley, Philip D., Calendron, Anne-Laure, Siqueira, Jonathas P., Liang, Houkun, Falcão-Filho, Edilson L., Lin, C. D., Kärtner, Franz X., and Hong, Kyung-Han. Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic. United States: N. p., 2018. Web. doi:10.1364/OE.26.016955.
Kroh, Tobias, Jin, Cheng, Krogen, Peter, Keathley, Philip D., Calendron, Anne-Laure, Siqueira, Jonathas P., Liang, Houkun, Falcão-Filho, Edilson L., Lin, C. D., Kärtner, Franz X., & Hong, Kyung-Han. Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic. United States. doi:10.1364/OE.26.016955.
Kroh, Tobias, Jin, Cheng, Krogen, Peter, Keathley, Philip D., Calendron, Anne-Laure, Siqueira, Jonathas P., Liang, Houkun, Falcão-Filho, Edilson L., Lin, C. D., Kärtner, Franz X., and Hong, Kyung-Han. Mon . "Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic". United States. doi:10.1364/OE.26.016955.
@article{osti_1454671,
title = {Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic},
author = {Kroh, Tobias and Jin, Cheng and Krogen, Peter and Keathley, Philip D. and Calendron, Anne-Laure and Siqueira, Jonathas P. and Liang, Houkun and Falcão-Filho, Edilson L. and Lin, C. D. and Kärtner, Franz X. and Hong, Kyung-Han},
abstractNote = {We systematically study the efficiency enhancement of high-harmonic generation (HHG) in an Ar gas cell up to the soft X-ray (SXR) range using a two-color laser field composed of 2.1 μm (ω) and 700 nm (3ω) with parallel linear polarization. Our experiment follows the recent theoretical investigations that determined two-color mid-infrared (IR) pulses, mixed with their third harmonic (ω + 3ω), to be close to optimal driving waveforms for enhancing HHG efficiency in the SXR region [Jin et al., Nature Comm. 5, 4003 (2014)]. We observed sub-optical-cycle-dependent efficiency enhancements of up to 8.2 of photon flux integrated between 20 – 70 eV, and up to 2.2 between 85 – 205 eV. Enhancement of HHG efficiency was most pronounced for the lowest tested backing pressure (≈ 140 mbar), and decreased monotonically as the pressure was increased. The single-color (ω)-driven HHG was optimal at the highest backing pressure tested in the experiment (≈ 375 mbar). Our numerical simulations based on single-atom response and 3D pulse propagation show good qualitative agreement with experimental observations. The lower enhancement at high pressure and higher photon energy indicates that phase matching of two-color-driven HHG is more sensitive to ionization rate and pulse propagation effects than the single-color case. We show that with further improvements to the relative phase jitter and the spatio-temporal overlap of the two beams, the efficiency enhancement could be further improved by at least a factor of ≈ 2.},
doi = {10.1364/OE.26.016955},
journal = {Optics Express},
number = 13,
volume = 26,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.26.016955

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Cited by: 6 works
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    Works referencing / citing this record:

    Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic
    text, January 2018


    Waveform control in generations of intense water window attosecond pulses via multi-color combined field
    journal, May 2019

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