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Light Amplification by Stimulated Emission of Radiation
Ruby Laser, by T. H. Maiman, 1960
National Ignition Facility, Lawrence Livermore Lab
1.8MJ, 192 Lasers
106J fired every second
106W = 10,000 100W lightbulbs
Enough to supply 3000 households
Nova Target Chamber (LBNL) - Laser Fusion
1 0
Compact Disc (CD) Reader
E
hn
absorption emission Stimulated emission
i
E
f
E
Mirror Mirror
Population inversion
i
E
f
E
Mirror Mirror
Spontaneous emission
i
E
f
E
Mirror
Mirror
Stimulated emission
i
E
f
E
Mirror
Mirror
Feed-back by the cavity
i
E
f
E
Mirror
Mirror
Stimulated emission
i
E
f
E
Mirror
Mirror
Feed-back by the cavity
i
E
f
E
Mirror
Mirror
Laser beam
After several round trips…
Photons with:
- same energy : Monochromatic
- same direction of propagation : Spatial coherence
- all in synchrony: Temporal coherence
Dye molecules:
strong absorption & emission
To make a dye lase
Pump:
UV laser
Cylinder Lens
Partial (4%) reflector
Off to the Lab!

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lectuZassacasre10.ppt