Pressure Effects on Spectra of Tunable Laser Crystal GSGG:Cr3+ III: Pressure-Induced Shift of R1 Line at 70 K  

Pressure Effects on Spectra of Tunable Laser Crystal GSGG：Cr^3＋Ⅲ：Pressure—Induced Shift of R1 Line at 70k

作　　者：MADong－Ping ZHANGJi－Ping 

机构地区：[1]DepartmentofAppliedPhysics,SichuanUniversity,Chengdu610065,China [2]InternationalCentreforMaterialsPhysics,theChineseAcademyofSciences,Shenyang110015,China

出　　处：《Communications in Theoretical Physics》2003年第4期493-500,共8页理论物理通讯（英文版）

摘　　要：By means of both a theory for pressure-induced shifts (PS) of energy spectra and a theory for shifts of energy spectra due to electron-phonon interaction (EPI), the 'pure electronic' PS and the PS due to EPI of R<SUB>1</SUB> line of GSGG:Cr<SUP>3+</SUP> at 70 K have been calculated, respectively. Their physical origins have been revealed. It is found that the admixture of and base-wavefunctions in the wavefunctions of R<SUB>1</SUB> level of GSGG:Cr<SUP>3+</SUP> at 70 K is remarkable under the normal pressure, and the degree of the admixture rapidly decreases with increasing pressure. The change of the degree of the admixture with the pressure plays a key role for not only the pure electronic PS of R<SUB>1</SUB> line but also the PS of R<SUB>1</SUB> line due to EPI. The detailed calculations and analyses show that the pressure-dependent behaviors of the pure electronic PS of R<SUB>1</SUB> line and the PS of R<SUB>1</SUB> line due to EPI are quite different. It is the combined effect of them that gives rise to the total PS of R<SUB>1</SUB> line, which has satisfactorily explained the experimental data (including a reversal of PS of R<SUB>1</SUB> line). In contributions to PS of R<SUB>1</SUB> line due to EPI at 70 K, the temperature-independent contribution is much larger than the temperature-dependent contribution. The former results from the interaction between the zero-point vibration of the lattice and localized electronic state.

关 键 词：high-pressure effect spin-orbit interaction electron-phonon interaction d orbital coupling between t(2)(2)(T-3(1))e(4)T(2) and t(2)(3)(2)E tunable laser crystal 

分 类 号：TN244[电子电信—物理电子学] O52[理学—高压高温物理]