Bulk and porous membranes of gallium phosphide have been characterized by optical second harmonic generation (SHG) technique using a 1064 nm pump beam. The porous membranes prove to exhibit an enhanced SHG in comparison with the bulk material. Taking into account the porosity-induced anisotropy we show analytically that the phase matching conditions can be fulfilled for membranes possessing a degree of porosity higher than 30%.
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Tiginyanu et al. (2000) studied this question.
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