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