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