Control of the nonlinear response of bulk GaAs induced by long-wavelength infrared pulses
Publisher
OPTICAL SOC AMERCitation
D. Matteo, J. Pigeon, S. Ya. Tochitsky, U. Huttner, M. Kira, S. W. Koch, J. V. Moloney, and C. Joshi, "Control of the nonlinear response of bulk GaAs induced by long-wavelength infrared pulses," Opt. Express 27, 30462-30472 (2019)Journal
OPTICS EXPRESSRights
Copyright © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The nonlinear optical response of GaAs is studied using extremely nonresonant 10 mu m laser pulses with peak intensities greater than 2 GW/cm(2). We observe over an order of magnitude enhancement in the four-wave mixing efficiency by decreasing the CO2 laser beat-wave frequency. This enhancement is attributed to currents of photoexcited unbound carriers modulated at the beat frequency, confirmed by measurements of nonlinear absorption at this long wavelength as well as a fully microscopic analysis of the excitation dynamics. Modeling of such nonperturbative semiconductor-laser interactions predicts that further decreasing the beat frequency can increase the nonlinear response and allow for its control over two orders of magnitude. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.Note
Open access journalISSN
1094-4087Version
Final published versionSponsors
United States Department of Defense, Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0139 DEF, FA9550-19-1-0032]; MURI Office of Naval Research [NOOO 14-17-1-2705]; Deutsche Forschungsgemeinschaft German Research Foundation (DFG) [SFB 1083]ae974a485f413a2113503eed53cd6c53
10.1364/oe.27.030462