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