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We measured the polarisation of the outgoing light beam of constant intensity induced by a nonlinear interaction with a second light beam of constant linear polarisation and variable intensity, in a thin plate of LiIO 3 crystal. The change in the polarisation of the first beam depends on the direction of polarisation of the second beam and cannot be explained as a thermal phenomenon. We present...
We present experimental results concerning the polarisation optical bistability in the B 5 NH 4 crystal together with an attempt of its theoretical explanation based on third-order optical nonlinearity and Fresnel's boundary conditions. In our experiments a strong laser beam is transmitted through a crystal plate of B 5 NH 4 . The polarisation state of the transmitted...
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