title: Fresnel formulas for the forced electromagnetic pulses and their application for optical-to-terahertz conversion in nonlinear crystals.
abstract: We show that the usual Fresnel formulas for a free-propagating pulse are not applicable for a forced terahertz electromagnetic pulse supported by an optical pulse at the end of a nonlinear crystal. The correct linear reflection and transmission coefficients that we derive show that such pulses can experience a gain or loss at the boundary. This energy change depends on linear dielectric constants only. We also predict a regime where a complete disappearance of the forced pulse under oblique incidence occurs, an effect that has no counterpart for free-propagating pulses.
authors.affiliation: Department of Radiophysics, University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia.
authors.forename: M I
authors.initials: MI
authors.lastname: Bakunov
authors.forename: A V
authors.initials: AV
authors.lastname: Maslov
authors.forename: S B
authors.initials: SB
authors.lastname: Bodrov