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