TRANSMISSION OF TIME MODULATED OPTICAL SIGNALS THROUGH AN ABSORBING PHOTOREFRACTIVE CRYSTAL

We solve the problem of the transmission of time modulated signals in a two-beam coupling photorefractive set-up using an absorbing material . We obtain an analytical expression that describes this phenomenon in absence of pump beam depletion due to beam coupling. We use this expr ession to analyse the influence of absorption on the photorefractive b uild-up. We also describe, using this model, the photorefractive beams plitter response. It is also showed that the mu/2 phase shift between illumination and index gratings is detrimental to a linear detection o f the phase variation of the signal beam.