Refractive Index of CsB3O5 Grown by Top-Seeded Solution Growth

CsB3O5 (CBO) crystals were grown by the top-seeded solution growth (TSSG) technique from a slightly Cs2O-enriched melt. The measured refractive indices of the CBO crystals disagreed with the previously reported values by a factor of 10-2. The reason for the disagreement was speculated to be the difference in Cs concentration in the CBO crystal and/or impurity concentration. Single-term Sellmeier's equations for TSSG-CBO were used for measuring refractive indices. The phase-matching angles of harmonic and sum-frequency generations of Nd:YLiF4 lasers were calculated based on single-term Sellmeier's equations, and the phase-matching angle of second-harmonic generation was verified experimentally.