acceptor level
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- upper state relaxation
- time-averaged shadow-moire method
- push out
- visible emissivity
- mode pattern
- Varotal lens
- metacrystalline
- optical head controllers,control ics/modules
- optical deformation
- filters
- frequency summing
- geometrical focus
- infra-red beam folower
- multilongitudianl-mode laser
- astrospectrograph camera
- diatomic roto
- holographic gratings
- optical harmonic generation
- chronophotography
- intensifying screen