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Brief Communications

Light-induced gratings in a medium exhibiting two-photon absorption

V. S. Idiatulin


Abstract: An analysis is made of the excitation of transient gratings as a result of the interaction of ultrashort pulses with a medium characterized by a two-photon nonlinearity. The amplitudes of the spatial modulation of the gratings are described by fourth-order correlation functions of a pulse and in the absence of phase modulation one of these functions is identical with a two-photon absorption trace (profile) measured by a traditional method. The spectral or angular distribution of the radiation diffracted by such gratings is linked uniquely to the amplitudes of their spatial modulation. A practical method is suggested for the study of ultrashort pulses: this method is free of the influence of the background and contrast, is independent of the luminescence mechanism, and can be used in conjunction with traditional methods.

UDC: 621.373.826

PACS: 42.65.Jx, 42.65.Re, 42.50.Gy, 42.50.Hz, 42.79.Dj

Received: 20.12.1983

 English version: Soviet Journal of Quantum Electronics, 1984, 14:8, 1112–113

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