Abstract
High-speed dynamic holography is studied numerically and experimentally in broad-area InGaAs/InP multiple-quantum-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 μm laser in a nondegenerate four-wave mixing configuration. The device operates at gigahertz speeds with a transient diffraction efficiency near 40%.
© 2015 Optical Society of America
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