355nm laser generation based on Na3La9O3(BO3)8 crystal

Na3La9O3(BO3)8 (NLBO) single crystals with size up to 35 × 20 × 15 mm3 have been grown by the top-seeded solution growth (TSSG) method. The phase-matching (PM) conditions and the effective nonlinear coefficients were fully calculated for third-harmonic generation (THG) at different wavelengths. The THG experiments for NLBO crystals were performed for the first time. A 355 nm UV light output of 1.9 mW was successfully obtained under a picosecond Nd:YAG laser. Through the calculations of effective nonlinear coefficients, we believe that the output power and conversion efficiency will further increase if the high optical quality NLBO samples can be utilized.