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