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[en] The possibility is shown for increasing the contrast ratio of intense (TW cm–2) femtosecond laser pulses by using a nonlinear Mach – Zehnder interferometer, and also under the conditions of cascade quadratic nonlinearity in two tandem uniaxial crystals detuned from the matching direction to opposite sides. In both the cases, the peak intensity slightly falls (by ∼10 %) and with additional chirp mirrors may even exceed the initial intensity. (paper)
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