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