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