Abstract

Excited-state absorption (ESA) spectrum of Cr⁴⁺:Mg₂SiO₄ (forsterite) was analyzed by electronic-state calculation method independent of ligand field theory. Both the ESA’s from the first-excited states in ³T₂(et₂) triplet and ¹E(e²) singlet terms were considered. Two ESA-dominant peaks apparently shown in experimentally obtained spectrum in literature were confirmed to have originated from ³A”[³T₂(et₂)] → triplets transitions. It was revealed that the region 13 000-14 000 cm⁻¹ should have ESA’s also for E//b and E//c polarizations. By comparing theoretically obtained oscillator strength with one obtained by an experiment, authors pointed out that effective Cr⁴⁺ concentration was one order of magnitude largely estimated in the literature.

© 2001 Optical Society of America