β-BaB₂O₄ with special cut-angle applied to single crystal cascaded third-harmonic generation

【摘要】 High-efficiency single crystal cascaded third-harmonic generation（THG） was realized in β-BaB₂ O₄（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.更多还原

【Abstract】 High-efficiency single crystal cascaded third-harmonic generation（THG） was realized in β-BaB₂ O₄（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.更多还原