在BBO晶体中获得271—281.5nm和频输出

本文用自制的Q-YAG的倍频光泵浦Rh·6G染料,用调谐的染料激光束(562—598nm)与YAG的倍频光束在B-BaB2O4(BBO)晶体中和频,获得的连续可调谐范围是271-281.5nm,和频输出能量大子200μJ,最高转换效率为5%.我们用陈创天等人和K.Kato所给BB0晶体的Sellmetier方程计算了和频调谐曲线,它们之间的相位匹配角大约有一度之差.实验曲线与两条理论曲线都有不同程度的偏差.但是,与K.Kato的理论曲线更为接近.我们还讨论了BBO晶体的长度对输出能量的影响,并解释了产生这种影响的原因。

SUM FREQUENCY OUTPUT OF 271-281.5nm IN BBO CRYSTAL

The Rh·6G dye laser was pumped by a home-made Q-YAG laser. The tunable dye laser beam (562-598nm) was used to generate the sum frequency with the double-frequency beam of YAG laser in β-BaB2O4 (BBO) crystal. The continuously tunable range of 271-281.5nm was obtained. The output energies of sum frequency are larger than 200μJ. The largest conversion efficiency is about 5%. The tuning curves of sum frequency were calculated by BBO Sallmeier equations of C. Chen and K.Kato. The angular differential of phase matching angle of both theoretical tuning curves is about one degree. There are deflections in varying degree between the experimental curve and the theoretical calculated curves. But, the theoretical curve calculated by BBO Sellmeier equention of Kato is very close to the experimental curve. We have discussed the influence of BBO crystal length on the output energy, and explained the cause generating the influence.