Phototropic centers in lasers systems based on rare earth garnet crystals

摘要

The emission from Cr3+ ions at 730 nm is enhanced under the action of the second harmonic radiation of a neodymium laser, while the intensity of emission at 1.54 mu m from Cr4+ ions in tetrahedral positions remains unchanged. This result casts doubt on the interpretation of absorption bands at 0.775-1.26 mu m and the luminescence bands at 1.103-1.67 mu m in the spectra of rare earth garnets, which have been previously assigned to electron transitions in Cr4+ ions occupying tetrahedral positions in the garnet structure. (C) 2005 Pleiades Publishing, Inc.