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