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Title: Lorentz drift compensation in high harmonic generation in the soft and hard X-ray regions of the spectrum

Here, we present a semi-classical study of the effects of the Lorentz force on electrons during high harmonic generation in the soft and hard X-ray regions driven by near- and mid-infrared lasers with wavelengths from 0.8 to 20 μm, and at intensities below 10 15 W/cm 2. The transverse extent of the longitudinal Lorentz drift is compared for both Gaussian focus and waveguide geometries. Both geometries exhibit a longitudinal electric field component that cancels the magnetic Lorentz drift in some regions of the focus, once each full optical cycle. We show that the Lorentz force contributes a super-Gaussian scaling which acts in addition to the dominant high harmonic flux scaling of λ -(5-6) due to quantum diffusion. We predict that the high harmonic yield will be reduced for driving wavelengths > 6 μm, and that the presence of dynamic spatial mode asymmetries results in the generation of both even and odd harmonic orders. Remarkably, we show that under realistic conditions, the recollision process can be controlled and does not shut off completely even for wavelengths >10 μm and recollision energies greater than 15 keV.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Colorado and NIST, Boulder, CO (United States)
  2. Imperial College London, London (United Kingdom); Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin (Germany)
Publication Date:
Grant/Contract Number:
NA0002135
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 19; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Krell Inst., Ames, IA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Harmonic generation and mixing; Ultrafast processes in fibers; UV, EUV, and X-ray lasers; X-rays, soft x-rays, extreme ultraviolet (EUV)
OSTI Identifier:
1435457

Galloway, Benjamin R., Popmintchev, Dimitar, Pisanty, Emilio, Hickstein, Daniel D., Murnane, Margaret M., Kapteyn, Henry C., and Popmintchev, Tenio. Lorentz drift compensation in high harmonic generation in the soft and hard X-ray regions of the spectrum. United States: N. p., Web. doi:10.1364/OE.24.021818.
Galloway, Benjamin R., Popmintchev, Dimitar, Pisanty, Emilio, Hickstein, Daniel D., Murnane, Margaret M., Kapteyn, Henry C., & Popmintchev, Tenio. Lorentz drift compensation in high harmonic generation in the soft and hard X-ray regions of the spectrum. United States. doi:10.1364/OE.24.021818.
Galloway, Benjamin R., Popmintchev, Dimitar, Pisanty, Emilio, Hickstein, Daniel D., Murnane, Margaret M., Kapteyn, Henry C., and Popmintchev, Tenio. 2016. "Lorentz drift compensation in high harmonic generation in the soft and hard X-ray regions of the spectrum". United States. doi:10.1364/OE.24.021818. https://www.osti.gov/servlets/purl/1435457.
@article{osti_1435457,
title = {Lorentz drift compensation in high harmonic generation in the soft and hard X-ray regions of the spectrum},
author = {Galloway, Benjamin R. and Popmintchev, Dimitar and Pisanty, Emilio and Hickstein, Daniel D. and Murnane, Margaret M. and Kapteyn, Henry C. and Popmintchev, Tenio},
abstractNote = {Here, we present a semi-classical study of the effects of the Lorentz force on electrons during high harmonic generation in the soft and hard X-ray regions driven by near- and mid-infrared lasers with wavelengths from 0.8 to 20 μm, and at intensities below 1015 W/cm2. The transverse extent of the longitudinal Lorentz drift is compared for both Gaussian focus and waveguide geometries. Both geometries exhibit a longitudinal electric field component that cancels the magnetic Lorentz drift in some regions of the focus, once each full optical cycle. We show that the Lorentz force contributes a super-Gaussian scaling which acts in addition to the dominant high harmonic flux scaling of λ-(5-6) due to quantum diffusion. We predict that the high harmonic yield will be reduced for driving wavelengths > 6 μm, and that the presence of dynamic spatial mode asymmetries results in the generation of both even and odd harmonic orders. Remarkably, we show that under realistic conditions, the recollision process can be controlled and does not shut off completely even for wavelengths >10 μm and recollision energies greater than 15 keV.},
doi = {10.1364/OE.24.021818},
journal = {Optics Express},
number = 19,
volume = 24,
place = {United States},
year = {2016},
month = {9}
}