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