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In this work we present results of calculations concerning bistability of optical polarisation in birefringent media. Second - order optical nonlinearity is assumed to be dominant and represented by one parameter. In our model the SHG regime is assumed. Light transmission is analysed in terms of standard Fabry - Perot model of feedback. We derived formulas for Stokes parameters describing the polarisation state. Numerical results have shown that three parameters may exhibit bistabile behaviour. This creates new possibilities for optical switching.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.