Control of the nonlinear response of bulk GaAs induced by long-wavelength infrared pulses.
Opt Express
; 27(21): 30462-30472, 2019 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-31684294
ABSTRACT
The nonlinear optical response of GaAs is studied using extremely nonresonant 10 µm 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 CO 2 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.
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MEDLINE
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2019
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Article