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通过拉曼散射光谱,吸收光谱,荧光发射寿命和808nmLD激发下的红外荧光光谱的实验测量,系统研究了Nd3+:SrMoO4晶体的自受激拉曼光谱性质.分析指认了拉曼散射光谱中各拉曼峰所对应的晶格振动模式,得出了其SRS活性最强的声子频率约为898cm-1,对应于(MoO42-)离子团的完全对称光学伸缩振动Ag模;通过J-O理论对晶体的吸收谱进行了全面的光谱参数计算,得出4F3/2→4I11/2跃迁的积分发射截面达0.57×10-18cm2,自发辐射概率为141.06s-1;同时,实验测得该跃迁的荧光发射寿命约为0.2ms.最后,结合808nmLD激发下的红外波段荧光光谱,论证了SrMoO4晶体中Nd3+离子1068nm发射通过拉曼频移获得1180nm一级斯托克斯激光发射的可能性,为Nd3+:SrMoO4晶体的自受激拉曼激光器研究提供了理论依据.
The self-excited Raman spectra of Nd3 +: SrMoO4 crystals were systematically investigated by Raman scattering, absorption spectra, fluorescence emission lifetime and infrared fluorescence spectra at 808nm excitation. The results of Raman scattering spectra The peak of the SRS activity is about 898cm-1, which corresponds to the fully symmetric optical telescoping vibration Ag mode of the (MoO42-) cluster. The crystal structure of the crystal The results show that the integral emission cross section of 4F3 / 2 → 4I11 / 2 transition reaches 0.57 × 10-18cm2 and the spontaneous emission probability is 141.06s-1. At the same time, the fluorescence of this transition The emission lifetime is about 0.2ms.Finally, combining the infrared band fluorescence spectra under 808nm LD excitation, we prove that the 1068nm emission of Nd3 + ions in SrMoO4 crystal can obtain 1180nm primary Stokes laser emission by Raman shift, SrMoO4 crystal self-excited Raman laser provides a theoretical basis.