Abstract:
The possibility of the appearance of a light–dark spatiotemporal soliton in the second-harmonic generation mode with the normal group velocity dispersion at the fundamental frequency in the absence of such a dispersion at the second harmonic frequency has been demonstrated theoretically. This object has the form of a dark two-color soliton with respect to time and coordinate in the direction of propagation and is light with respect to the transverse (spatial) coordinates.
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