Abstract
Quadratic solitons were observed a few years ago during second harmonic generation in both bulk crystals (2D) and planar waveguides (1D)[1,2]. They consist of strongly coupled fundamental and harmonic fields which propagate locked together in space without diffraction due to a combination of the cascaded nonlinearity and the strong inter-beam coupling inherent in SHG.
© 1998 Optical Society of America
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