532 nm激光泵浦硝酸钡晶体产生外腔拉曼激光

由于硝酸钡晶体具有很强的对称振动（频率1047 cm^-1）和较高的拉曼增益,可以用来产生受激拉曼激光.采用单端泵浦的外置拉曼振荡腔与双棱镜分光装置进行了硝酸钡晶体拉曼激光实验,泵浦源为倍频Nd： YAG的532 nm激光,硝酸钡晶体通过水溶液降温法生长,尺寸为10 mm×10 mm×48 mm,采用特殊镀膜的腔镜对各阶斯托克斯光进行优化选择.在泵浦源达到65 mJ时,获得21 mJ一阶斯托克斯光,输出波长为563 nm,以及16 mJ的二阶斯托克斯光,输出波长为599 nm,受激拉曼散射SRS最大的整体

Barium nitrate crystal was proposed as one of the perspective Raman materials due to its intense symmetrical vibrations with the frequency of 1 047 cm^-1 and comparative high Raman gain.A harmonic of Nd:YAG laser(532 nm) pumped barium nitrate crystal in external resonator and excited stimulated Raman laser.Experimental setup adopted the Raman shifter consisted of external cavity and two prisms spectrometer.The external cavity was composed of diachronic mirrors with optimal reflectivity for Stokes components.Barium nitrate crystal was grown by the aqua-solution cooling method with the size of 48 mm×10 mm×10 mm.When the pump laser energy is 65 mJ,the output energy of first Stokes laser(563 nm) and that of second Stokes laser(599 nm) were measured as 21 mJ and 16 mJ respectively.The total maximal conversion efficiency of stimulated Raman scattering to the first and second Stokes components was 56.3%.