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High-order nonlinear phase shift caused by cascaded third-order processes

机译:级联三阶过程引起的高阶非线性相移

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We show, for the first time to our knowledge, that the fundamental beam that participates in the process of third-harmonic generation experiences an additional high-order nonlinear phase shift. The magnitude of the shift is proportional to the square of the pump intensity and the length of the sample and depends on the deviation fi om the exact phase-matched condition. This phase shift arises from cascaded third-order processes. Its value can exceed the value of the phase shift. that originates from inherent fifth-order susceptibility of the nonlinear medium. its sign is controllable by the sign of the phase mismatch of the third-harmonic generation process. (C) 1997 Optical Society of America
机译:我们首次了解到,参与三次谐波生成过程的基波会经历额外的高阶非线性相移。位移的大小与泵浦强度的平方和样品的长度成正比,并且取决于精确的相位匹配条件的偏差。这种相移是由级联的三阶过程引起的。其值可以超过相移的值。这源于非线性介质固有的五阶磁化率。其符号可通过三次谐波产生过程的相位不匹配的符号来控制。 (C)1997年美国眼镜学会

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