Abstract
A detailed theoretical analysis of the second harmonic generation in the strong absorption regime (great absorption index K 2w) is presented. Inside the nonlinear medium, it is found that only the harmonic wave travelling in the same direction as the fundamental one survives. Outside the nonlinear medium, the transmitted and reflected intensities of the harmonic waves show a peculiar dependence on k 2w- The ratio between transmitted and reflected intensities ranges from 5 to 75. Reflected and transmitted harmonic waves appear to be generated in the outer layers within a thickness of a fraction of wavelength. Experimental support is reported with application to a proton-exchanged LiNbO3 waveguide.
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