$CaF_2$ crystal growth for using optical components of laser

Large vacuum Bridgman-Stockbarger (BS) equipments was composed for growing large diameter CaF2 crystals. The CaF2 crystal of 4.5-inch was grown under the conditions of freezing temperature gradient of 12$^{\circ}C$/cm and growing rate of 3mm/hr. Also the 6-inch crystal was grown by using thermal stabilization method under freezing temperature gradient of 14$^{\circ}C$/cm and growing rate of 2mm/hr. The dislocation density was characterized for evaluating the quality of crystals. And the optical properties such as transmittance, refractive index and fluorescence were analyzed in order to investigate on the applications of optical components.