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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Interference and optical manipulation of degenerate biexcitonic waves

Makoto Kuwata‐Gonokami, Ryo Shimano, A. Mysyrowicz

Published Nov 13, 2002• 0 citations
Publisher

Abstract

We propose and demonstrate a scheme for the creation and manipulation of long lived coherent biexcitonic ensemble with high quantum degeneracy by using a phase space compression scheme of two-photon excitation with femtosecond pulses in CuCl.
DOI
10.1109/cleopr.2001.971123

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A reversible coupling between photon pair states and a long-lived, highly coherent biexciton wave in CuCl allows efficient phase-sensitive two-photon amplification or attenuation of ultrashort light pulses. We demonstrate a gain of 350 cm(-1) for a pump intensity of 1 MW/cm(2), nearly 2 orders of magnitude higher than that achievable with conventional parametric crystal amplifiers. We develop a theoretical model that describes this new type of parametric converter where the light pump is replaced by a coherent biexciton wave and show that it is well suited for the generation of entangled photons and the squeezing of an optical beam with ultrafast time gating.
We propose an experimental scheme to evaluate the intrinsic anharmonicity of the biexciton ensemble by extending the conventional four-wave mixing technique to coherent biexciton waves, which can be prepared by two-photon absorption of ultrashort optical pulses. The anharmonicity originates from the two-body interaction of the bosonic quasi-particles at low densities and leads to Kerr-type nonlinearity for the coherent biexcitonic waves generated in the crystal. We discuss the feasibility of determining the two-body biexciton interaction energy in CuCl by measuring the anharmonicity of the biexcitonic ensemble.