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 10 6 J fired every second 10 6 W = 10, W lightbulbs Enough to supply 3000 households

Nova Target Chamber (LBNL) - Laser Fusion

1 0 Compact Disc (CD) Reader

E h absorptionemissionStimulated emission

Mirror Population inversion

Mirror Spontaneous emission

Mirror Stimulated emission

Mirror Feed-back by the cavity

Mirror Stimulated emission

Mirror Feed-back by the cavity

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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