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

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

doi:10.1364/OE.26.016955

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 »« less

Authors:

;

; Krogen, Peter; Keathley, Philip D.; Calendron, Anne-Laure; Siqueira, Jonathas P.; Liang, Houkun; Falcão-Filho, Edilson L.;

; Kärtner, Franz X.;

Publication Date:: Mon Jun 18 00:00:00 EDT 2018

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.

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                    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.  https://doi.org/10.1364/OE.26.016955

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                    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.  https://doi.org/10.1364/OE.26.016955.

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@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         = {Mon Jun 18 00:00:00 EDT 2018},

  month        = {Mon Jun 18 00:00:00 EDT 2018}

}

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