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