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