Lecture+9 - LASER; light amplification by stimulated...

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LASER; light amplification by stimulated emission of radiation In phase Same direction Coherent Population inversion
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Ruby laser In phase Same direction Coherent Al 2 O 3 Doped with chromium Ruby
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Gas and solid state lasers
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Nd:YAG laser Nd ion in a host crystal of Ytrium aluminum garnet In phase Same direction Coherent
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Energy gap Transducer: High sensitivity High signal-to-noise ratio Constant response over a wide range of wavelengths Zero output signal in the absence of illumination Electric signal proportional to radiant power Dark current –small constant response d Sk P k = +
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Infrared 100 nm
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This note was uploaded on 02/14/2011 for the course SCIENCE 321 taught by Professor Aaa during the Spring '11 term at Windsor.

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Lecture+9 - LASER; light amplification by stimulated...

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