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