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In this paper, the first measurement of the ordering induced birefringence in GaInP and (Al0.33Ga0.67)InP is presented. It is found that these ordered crystals are positively birefringent far below the bandgap and become negatively birefringent at the bandgap. The method to measure the birefringence is based on the modifications introduced by ordering to the mode structure of planar waveguides. The...
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