Signal-beam amplification is achieved in degenerate two-wave mixing experiments in liquid crystals at the wavelength A = 1O.6!lm of the cw CO 2 laser, The origin of the dynamic grating is the large thermal index change that arises when the cell operates near the phase transition temperature. Maxwell's equations are analytically solved for the calculation of the amplitude variations of the incident waves Up :pump,/s :signai) and of the self-diffracted wave (1--1)' It is shown that energy transfer arises from the contribution of the 1T12 component of the index modulation generated by the interference of (Ip ,J -1)' The resulting three-wave model yields good agreement with the experimental results.

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The coupling between single mode optical fibers and integrated optical devices and particularly Ti diffused LiNbO3 waveguides has been deeply investigated. Recently very good results have been obtained leading to the possibility of building pigtailed integrated optic devices (1, 2, 3).

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