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