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