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