Light Amplification by Stimulated Emission of Radiation

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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 second 106W 10,000 100W
lightbulbs Enough 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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E
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Population inversion
Mirror
Mirror
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Spontaneous emission
Mirror
Mirror
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Stimulated emission
Mirror
Mirror
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Feed-back by the cavity
Mirror
Mirror
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Stimulated emission
Mirror
Mirror
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Feed-back by the cavity
Mirror
Mirror
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After several round trips
Mirror
Mirror
Laser beam
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
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Off to the Lab!