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Phase phenomena in parametric amplifiers and generators of ultrashort light pulsesThis article reviews recent theoretical and experimental investigations in the development of femtosecond lasers based on optical parametric oscillators. Phenomena responsible for producing tunable high-power femtosecond pulses in media with quadratic susceptibility (parametric chirp, chirp reversal in real time, parametric self-compression of pulses with strong energy exchange) are discussed.
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