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Light Amplification by Stimulated Emission of Radiation
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Ruby Laser, by T. H. Maiman, 1960
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National Ignition Facility, Lawrence Livermore Lab 1.8MJ, 192 Lasers
106J fired every second106W = 10,000 100W lightbulbsEnough to supply 3000 households
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Nova Target Chamber (LBNL) - Laser Fusion
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Compact Disc (CD) Reader
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absorption emission Stimulated emission
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fEMirror Mirror
Population inversion
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fEMirror MirrorSpontaneous emission
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fEMirrorMirror
Stimulated emission
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iE
fEMirrorMirror
Feed-back by the cavity
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iE
fEMirrorMirror
Stimulated emission
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iE
fEMirrorMirror
Feed-back by the cavity
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fEMirrorMirror
Laser beam
After several round trips…
Photons with: - same energy : Monochromatic- same direction of propagation : Spatial coherence- all in synchrony: Temporal coherence
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To make a dye lase
Pump:UV laser
Cylinder Lens
Partial (4%) reflector
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Off to the Lab!