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