Wavelength Scaling of High Harmonic Generation Close to the Multiphoton Ionization Regime
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Lai_Wavelength-scaling.pdf
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Author(s)
Lai, Chien-Jen
Cirmi, Giovanni
Hong, Kyung-Han
Moses, Jeffrey
Huang, Shu-Wei
Bhardwaj, Siddharth
Granados, Eduardo
Keathley, Phillip Donald
Kaertner, Franz X.
Date Issued
August 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lai, Chien-Jen, Giovanni Cirmi, Kyung-Han Hong, Jeffrey Moses, Shu-Wei Huang, Eduardo Granados, Phillip Keathley, Siddharth Bhardwaj, and Franz X. Kärtner. “Wavelength Scaling of High Harmonic Generation Close to the Multiphoton Ionization Regime.” Physical Review Letters 111, no. 7 (August 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We study the wavelength scaling of high harmonic generation efficiency with visible driver wavelengths in the transition between the tunneling and the multiphoton ionization regimes where the Keldysh parameter is around unity. Our experiment shows a less dramatic wavelength scaling of efficiency than the conventional case for near- and mid-IR driver wavelengths, and it is well explained by a generalized three-step model for increased Keldysh parameters that employs complex ionization times in addition to the nonadiabatic ionization. The complex ionization time is critical to avoid the divergence when replacing the quasistatic ionization model by the more general nonadiabatic ionization model. Together, the two modifications present a consistent description of the influence of the atomic potential on the rescattering process in the intermediate Keldysh regime.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.073901
