调谐激光晶体Cr^（3＋）：ZnWO＿4光致发光特性的研究  

PHOTOLUMNESCENCE PROPERTIES OF TUNABLE LASER CRYSTAL Cr￣(3+): ZnWO_4

作　　者：陈伟[1] 夏上达[1] 汤洪高[1] 刘竟青 臧竟存[1] 万寿科[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,中国科学技术大学物理系,中国科学技术大学结构分析开放研究实验室,中国科学院物理研究所,北京工业大学,中国科学院半导

出　　处：《物理学报》1994年第5期851-857,共7页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：研究了调谐激光晶体Ｃｒ￣（３＋）：ＺｎＷＯ＿４的光致发光特性。报道了它的吸收光谱、激发光谱、发射光谱及其随温度的变化、零声子跃迁和发射寿命等实验结果，并讨论了激发特性、电子－声子耦合作用、ＺｎＷＯ＿４中Ｃｒ￣（３＋）的发射寿命曲线等相关问题。We investigate the photoluminescence properties of Cr￣(3+):ZnWO_4 single crystal,which channels all the fluorescence into the broadband to transitionat about 990nm wavelength.Experiment results of the absorption spectra and theexcitation spectrum,ternperature dependence of the emission spectra,decay curves ofCr￣(3+)ions are presented and discussed.The most efficient excitation wavelength is inthe red region.Radiative decay from the luminescence level to the ground level ischaracterized by broad emission bands as a consequence of a strong electron-phonon interaction──Hua-Rhys factor S(300K)=4.22,S(12.7K)=7.09,the average pho-non energy hv(300K)=405cm￣(-1),hv(12.7K)=213cm￣(-1).The zero-phonon transitionline probably is at wavelength of 856.7nm.If there are two kinds of Cr￣(3+)center,oneis compensated by the adjacent vacancy(1.80μs),and the other is compersated nonl-ocally(5.45μs).

关 键 词：激光晶体 钨酸锌 光致发光 

分 类 号：TN244[电子电信—物理电子学]