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