Session:
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Upper Division Undergraduate
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Paper Type:
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Contributed
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Title:
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Faraday Isolators and the Second Law of Thermodynamics
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Meeting:
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2016 Summer Meeting: Sacremento, California |
Location:
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N/A |
Date:
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Time:
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1:40PM
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Author:
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Carl E. Mungan, U.S. Naval Academy
410-293-6680, mungan@usna.edu
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Co-Author(s):
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None
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Abstract:
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Consider a Faraday isolator: two optical linear polarizers whose transmission axes are oriented 45 degrees relative to each other, between which is located a magnetic rotator that turns the plane of polarization of a beam of light by 45 degrees in the same direction regardless of the direction of propagation of the light. That constitutes a one-way light valve, used to protect lasers from harmful back-reflections. Now place a sample inside a cavity whose walls are made of this stuff. Light gets out but not back in, right? If so, the sample would radiate away all its energy and cool down to absolute zero! How do we save the second law from this catastrophe?
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Footnotes:
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None
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Presentation:
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AAPT_Mungan.pdf
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