Preface 1. An introduction to lasers 2. Symmetry considerations 3. Optical crystals: their structures, colours and growth 4. Energy levels of ions in crystals 5. Spectra of ions in crystals 6. Radiationless transitions 7. Energy transfer and excited state absorption 8. Covalency 9. Engineering the crystal field 10. The crystal field engineered.
{{comment.content}}