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Influence of cubic nonlinearity on compensation of thermally induced polarisation distortions in Faraday isolators

The problem on laser radiation propagation in a birefringent medium is solved with the allowance made for thermally induced linear birefringence under the conditions of cubic nonlinearity. It is shown that at high average and peak radiation powers the degree of isolation in a Faraday isolator noticeably reduces due to the cubic nonlinearity: by more than an order of magnitude when the -integral is equal to unity. This effect is substantial for pulses with the energy of , duration of to and pulse repetition rate of .