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