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