Bragg holography in active semiconductor microcavities

摘要

High-speed dynamic holography is studied numerically and experimentally in broad-area InGaAs/InP multiplequantum- well asymmetric Fabry-Perot microcavities with optically pumped gain gratings operating near the lasing threshold. Two numerical approximation methods are developed to predict Bragg diffraction effects in these active microcavities. The Cavity Raman-Nath method assumes multipass Raman-Nath diffraction, while the Cavity Bragg method assumes an effective medium. Both methods predict that Raman-Nath diffraction in a micrometer-thick cavity resonator can exhibit Bragg-like selectivity for angles near the Bragg angle. The angular and spectral selectivities are studied experimentally in optically pumped free-carrier gratings using a tunable 1.55 mu m laser in a nondegenerate four-wave mixing configuration. The device operates at gigahertz speeds with a transient diffraction efficiency near 40%. (C) 2015 Optical Society of America