自受激拉曼晶体Nd^(3+):SrMoO_4的光谱性质研究  

Spectroscopic properties of self-exited Raman scattering of the Nd^(3+):SrMoO_4 crystal

作　　者：韩琳[1] 宋峰[1] 万从尚[1] 邹昌光[1] 闫立华[1] 张康[1] 田建国[1] 

机构地区：[1]天津市南开大学物理科学学院光子学中心,天津300071

出　　处：《物理学报》2007年第3期1751-1757,共7页Acta Physica Sinica

基　　金：教育部'新世纪优秀人才支持计划'(批准号:560-903102;560-903103);教育部留学回国人员科研启动基金(批准号:b2a2023160);教育部优秀青年教师资助计划(批准号:C01177);天津市自然科学基金(批准号:05YFGPGX05100);长江学者和创新团队发展计划资助的课题.~~

摘　　要：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 spectral performance of a self-Raman-active material （Nd： SrMoO4 crystal） was investigated. Its stimulated Raman scattering （SRS）, absorption spectra, luminescence lifetime, and infrared emission under 808 nm LD excitation were measured at room temperature. All vibration modes in the SRS spectra were identified. The most intense vibration is As （898 cm^-1 ） mode, which is assigned to fully symmetric extension vibrations of the （MoO4^2-） group. Optical parameters were calculated from absorption spectra with Judd-Ofeh （J-O） theory. The integrated emission cross-section and spontaneous emission probability corresponding to 1068 nm emission are 0.57 × 10^-18 cm^2 and 141.06 s^-1 , respectively. The lifetime of the 1068 nm emission was measured to be 0.2 ms. Considering the infrared luminescence excited by 808 nm LD, the possibility of obtaining 1180 nm first-Stokes component relevant to the 1068 nm emission is demonstrated. These conclusions can be our guidance to develop highefficiency new-wavelength self-excited Raman lasers.

关 键 词：Nd^3+离子 SrMoO4晶体 自受激拉曼散射 光谱性质 

分 类 号：O734.3[理学—晶体学]