- [optically] negative crystal
- optically negative crystal
- [optically] positive crystal
- optically positive crystal
- optically rarer medium
- Optically Stimulated Luminescence Dating
- optically stimulated Luminescence dating
- optically stimulated luminescence dosimeter
- optically Stimulated Luminescence for identification of irradiated food
- optically stimulated luminescence radiation detector
- optically thick
- optically thick medium
- optically thin
- optically thin absorption
- optically thin emission
- optically thin medium
- optically thinner medium
- optically transparent electrode
- optically violently variable quasar
- optically violent variable quasar
- optically visible object
- optical machining
- optical magnetization switching
- optical manipulation
- optical mark reader