High-efficiency single crystal cascaded third-harmonic generation（THG） was realized in β-BaB_2 O_4（BBO） material with special cut-angle. By analyzing effective nonlinear optical coefficient（deff） of the cascade...High-efficiency single crystal cascaded third-harmonic generation（THG） was realized in β-BaB_2 O_4（BBO） material with special cut-angle. By analyzing effective nonlinear optical coefficient（deff） of the cascaded THG process, which was composed by type-II frequency doubling and type-I sum-frequency, the optimum phase matching（PM） direction in BBO crystal was determined to be（θ = 32.1？, φ = 11？）. With an optimized 9-mm long sample which was processed along this direction, the highest cascaded THG conversion efficiency reached 42.3%, which is much superior to the similar components reported previously, including ADP, KDP, and Gd_x Y_（1-x） COB crystals.展开更多
基金Project supported by the Natural Science Foundation of Shandong Province,China(Grant Nos.ZR2017MF031 and ZR2018BF029)
文摘High-efficiency single crystal cascaded third-harmonic generation（THG） was realized in β-BaB_2 O_4（BBO） material with special cut-angle. By analyzing effective nonlinear optical coefficient（deff） of the cascaded THG process, which was composed by type-II frequency doubling and type-I sum-frequency, the optimum phase matching（PM） direction in BBO crystal was determined to be（θ = 32.1？, φ = 11？）. With an optimized 9-mm long sample which was processed along this direction, the highest cascaded THG conversion efficiency reached 42.3%, which is much superior to the similar components reported previously, including ADP, KDP, and Gd_x Y_（1-x） COB crystals.
