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Title: Observation of backward high-harmonic emission from solids

Abstract

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:
; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1435882
Alternate Identifier(s):
OSTI ID: 1458536
Grant/Contract Number:  
Early Career Research Program; AC02-76SF00515; FA9550-14-1-0108
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 26 Journal Issue: 9; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
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

Citation Formats

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., 2018. 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. Thu . "Observation of backward high-harmonic emission from solids". United States. doi:10.1364/OE.26.012210.
@article{osti_1435882,
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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.26.012210

Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: High-harmonic spectra measured in the specular reflection direction, from (a) a (100)- oriented MgO crystal with 1.32 µm laser excitation and (b) a (100)-oriented Si crystal with 2.1 µm laser excitation. In (a), the driver is s-polarized (red and blue lines), or p-polarized (black line). The spectrum formore » p-polarization has been multiplied by 2 to account for the lower reflectivity of the grating. The estimated intensities of the driver are 23 and 33 TW/cm2 (corresponding to 90 and 130 µJ driving-pulse energy). Harmonic power is normalized to the 17th order at the highest intensity. The angle of incidence is 45°. In (b), the angle of incidence is 46°, the driving laser is p-polarized, and the vacuum intensity is 4.2 TW/cm2. The highest detected harmonic in the case of Si is limited by the detection range of the VIS-UV spectrometer used.« less

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