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YCa 4 O(BO 3 ) 3 has been found to be 90° phase-matchable for type-1 second-harmonic generation at 0.4168 µm along the z -axis at 20°C. The improved Sellmeier equations of YCa 4 O(BO 3 ) 3 that correctly reproduce our new experimental data for second-harmonic and sum-frequency generation in the 0.3547–1.9079 µm range are reported. In addition, the 90° phase-matching properties of Gd x Y 1- x Ca 4 O(BO 3 ) 3 as a function of the Gd molar concentration X are presented together with the empirical index formula.
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Umemura et al. (2001) studied this question.
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