Stress Effects on the Fluorescence Spectra of Tetravalent Chromium in SomeCrystalline Hosts

摘要

We have investigated the effects of uniaxial stress on the fluorescence spectraof Cr-doped forsterite, YAG and Y2SiO5. Large spectral shifts were found in all three crystals. In addition, pseudo-splittings of the emission spectra were observed. The large spectral shifts allow us to conclude that the lasing emission in these crystals originates from the 3T2 state but not the E state. The stress effects also provide information which helps us to identify the nature of the site being occupied by tetravalent chromium ions in these crystalline hosts. (jg).