Growth of K2Al2B2O7 crystal for UV light generation

Abstract A new nonlinear optical alumino-borate crystal, K 2 Al 2 B 2 O 7 (KAB) with dimensions of 21×18×13 mm 3 , has been grown using a modified middle-seeded solution growth method. The significant abilities of KAB crystals for the generation of power ultraviolet (UV) light have been demonstrated. Crystalline KAB has been successfully used to generate the third harmonics of 1064.2 nm light. The dependence of the average power of the 355 nm third harmonic radiation on the Nd:YAG laser power has been studied. 200 mW average power UV pulses at 193 nm were generated in KAB by mixing the Nd:YAG laser and sum-frequency generation of a RbTiOAsO 4 (RTA) optical parametric oscillation at 10 kHz. No degradation in the output power was observed after 50 h operation.