Giant momentary readout produced by switching electric fields during two-wave mixing in sillenites

Abstract

We show theoretically and experimentally that switching an applied square-wave field produces strong and short pulses of the outgoing signal during two-wave mixing in sillenite crystals. These pulses originate from the strong effect of the field on the optical eigenmodes and can be used in new optical schemes based on time-separated recording and readout processes.

Vectorial two-beam coupling with arbitrary shifted photorefractive gratings: An analytical approach

“…Recently, many experimental works were done with the samples of cubic crystals of high optical quality, long length of beam interaction and strong enhancement of the photorefractive response by high electric field [6][7][8][9][10][11]. These samples have allowed reaching high gain of signal waves when the depletion of the pump beam is inevitable.…”

“…Our analysis is based on the vectorial equations for the steady-state amplitudes of the coupled waves in photorefractive crystal, the same as have been used in the other published works [5,10,16,17]. Many effects associated with the wave's polarization evolution caused by the vectorial TWM have been analyzed and understood using analytical or numerical solutions of these equations.…”