Light Amplification by Stimulated Emission of Radiation

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Presentation transcript:

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

Compact Disc (CD) Reader 1

hn absorption emission Stimulated emission E

Population inversion Mirror Mirror

Spontaneous emission Mirror Mirror

Stimulated emission Mirror Mirror

Feed-back by the cavity Mirror Mirror

Stimulated emission Mirror Mirror

Feed-back by the cavity Mirror Mirror

After several round trips… Mirror Mirror Laser beam Photons with: - same energy : Monochromatic - same direction of propagation : Spatial coherence - all in synchrony: Temporal coherence

strong absorption & emission Dye molecules: strong absorption & emission

To make a dye lase Partial (4%) reflector Pump: UV laser Cylinder Lens

Off to the Lab!

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