Chromium Ions in Tetrahedral Sites
Abstract
Chromium doped akermanite crystals were investigated by optical spectroscopy and electron paramagnetic resonance spectroscopy. The results were compared to chromium doped forsterite to study the roles of tetrahedrally coordinated chromium ions in the near-infrared laser transition. Akermanite crystals were successfully grown by Czochralski methods. The growth processes and characteristics of various furnaces were explored to yield good optical quality crystals. The energy levels of chromium ions in tetrahedral sites can be explained by crystal field theory. The ground state energy level splitting under an external magnetic field is well described by spin-hamiltonian matrices. From electron paramagnetic resonance measurements of the chromium doped akermanite and forsterite crystals and the similarity of their optical absorption spectra, tetravalent chromium ions were believed to occupy tetrahedral sites in all the samples. However, there exist considerable differences in zero-phonon line transitions and emission spectra.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1991
- Accession Number
- ADA251636
Entities
People
- Vei-han Chan
Organizations
- Massachusetts Institute of Technology