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