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Extremely Nondegenerate Two-Photon Absorption and Detection in Direct Gap Semiconductors

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Abstract

Two-to-Three orders of magnitude enhancement of nondegenerate two-photon absorption (2PA) compared to degenerate 2PA are observed. Femtosecond gated detection of low power mid-IR radiation using ultraviolet gating pulses using a GaN detector at room temperature is demonstrated.

© 2011 Optical Society of America

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