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Collinear Phase Matching For Second Harmonic Generation Using Conoscopic Interferometry, A Puri, A De
Collinear Phase Matching For Second Harmonic Generation Using Conoscopic Interferometry, A Puri, A De
Physics Faculty Publications
The problem of finding phase-matching directions in noncentrosymmetric biaxial crystals is simplified here by the use of Conoscopic interferometry. Based on vector relations for wave propagation in birefringent media and solutions to phase-matching equations, we show that phase matching directions can be located on the conoscopic interferograms and that fringe numbers for dark-isochromes can be used as a guide to find phase-matching directions for a biaxial crystal. This technique can be generalized and extended to any anisotropic crystal. We have demonstrated this method for the particular case of a biaxial KTiOPO4 crystal, where it is found to be particularly …