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Title: Observation of backward high-harmonic emission from solids

Here, we experimentally demonstrate backward emission of high-harmonics of a near-infrared laser from MgO and Si crystals in the direction of specular reflection. We show that the variation of the high-harmonic power with the angle of incidence can be predicted with nonlinear reflection coefficients derived originally for perturbative nonlinearities. A comparison of transmission and reflection geometries suggests that backward-propagating high-harmonics are an excellent reference to study nonlinear propagation of intense light in solids. Backward emission will enable phase matching of the high-harmonic beam and the integration of the functionalities of extended gas-phase high-harmonic beamlines into a single optical element. The potential to achieve phase matching paves the way to solid-state based high-harmonic sources with higher flux than the best transmission-based sources, where high-harmonics are strongly absorbed by the crystal itself.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; FA9550-14-1-0108; Early Career Research Program
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 26; Journal Issue: 9; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Nonlinear optics at surfaces; Multiharmonic generation; Optical nonlinearities of condensed matter
OSTI Identifier:
1458536

Vampa, G., You, Y. S., Liu, H., Ghimire, S., and Reis, D. A.. Observation of backward high-harmonic emission from solids. United States: N. p., Web. doi:10.1364/oe.26.012210.
Vampa, G., You, Y. S., Liu, H., Ghimire, S., & Reis, D. A.. Observation of backward high-harmonic emission from solids. United States. doi:10.1364/oe.26.012210.
Vampa, G., You, Y. S., Liu, H., Ghimire, S., and Reis, D. A.. 2018. "Observation of backward high-harmonic emission from solids". United States. doi:10.1364/oe.26.012210. https://www.osti.gov/servlets/purl/1458536.
@article{osti_1458536,
title = {Observation of backward high-harmonic emission from solids},
author = {Vampa, G. and You, Y. S. and Liu, H. and Ghimire, S. and Reis, D. A.},
abstractNote = {Here, we experimentally demonstrate backward emission of high-harmonics of a near-infrared laser from MgO and Si crystals in the direction of specular reflection. We show that the variation of the high-harmonic power with the angle of incidence can be predicted with nonlinear reflection coefficients derived originally for perturbative nonlinearities. A comparison of transmission and reflection geometries suggests that backward-propagating high-harmonics are an excellent reference to study nonlinear propagation of intense light in solids. Backward emission will enable phase matching of the high-harmonic beam and the integration of the functionalities of extended gas-phase high-harmonic beamlines into a single optical element. The potential to achieve phase matching paves the way to solid-state based high-harmonic sources with higher flux than the best transmission-based sources, where high-harmonics are strongly absorbed by the crystal itself.},
doi = {10.1364/oe.26.012210},
journal = {Optics Express},
number = 9,
volume = 26,
place = {United States},
year = {2018},
month = {4}
}