Energy Spectra of the Tunable Laser Crystal Gd3Ga5O12:Cr3+ and Their Pressure-Induced Shifts |
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| Authors: | MA Dong-Ping |
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| Affiliation: | 1. Department of Applied Physics, Sichuan University, Chengdu 610065, China;2. International Centre for Materials Physics, Academia Sinica,Shenyang 110015, China |
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| Abstract: | By means of both the theory for pressure-induced shifts(PS) of energy spectra and the theory for shifts of energy spectradue to electron-phonon interaction (EPI), at 300 K,the `pure electronic' contributions andthe contributions from EPI to R1 line, R2 line, and U band ofGGG:Cr3+ as well as their PS have been calculated, respectively.The total calculated results are in good agreement with all theexperimental data. Their physical origins have been explained.It is found that the mixing-degree of |t22(3T1)e4T2> and |t232E> base-wavefunctions in the wavefunctions of R1 level of GGG:Cr3+ is considerableunder normal pressure, and the mixing-degree rapidly decreaseswith increasing pressure. The change of the mixing-degree withpressure plays a key role for PS of R1 line or R2 line. At300 K, both the temperature-independent contribution to R1 line(or R2 line or U band) from EPI and the temperature-dependent oneare important. The remarkable difference between pressure-dependentbehaviors of PS of R1 lines of GGG:Cr3+ and GSGG:Cr3+ resultsfrom the differences of their microscopic properties. The featuresof emission spectra of GGG:Cr3+ at various pressures have satisfactorilybeen explained. |
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| Keywords: | high-pressure effect line shift spin-orbit interaction electron-phonon interaction d-orbital tunablelaser crystal |
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