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