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Definition of "nondegenerate two-wave mixing" |
a general case of two wave mixing in which the two beams are of different frequencies. In two-wave mixing, if the frequencies of the two laser beams are different, the interference fringe pattern is no longer stationary. A moving volume refractive index grating can still be induced provided that the intensity fringe pattern does not move too fast. The amplitude of the refractive index modulation decreases as the speed of the fringe pattern increases. This is related to the finite time needed for the formation of the refractive index grating in the photorefractive medium. Such a kind of two-wave mixing is referred to as nondegenerate two-wave mixing. |
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