Interference cavity for controlling optical path
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United States of America Patent
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Feb 19, 2013
Grant Date -
Sep 22, 2011
app pub date -
Mar 2, 2010
filing date -
Dec 22, 2009
priority date (Note) -
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Abstract
The present patent application provides an interference cavity for precisely controlling an optical path including a cavity formed by two equal distance arms, wherein a positive adjusting plate and a negative adjusting plate are disposed in the interference cavity for compensating the change of a cavity length with temperature and thereby ensuring that the interference cavity length is a constant. The present patent application utilizes the matching relationship between the change of the refractive index of the positive adjustment plate with the temperature and the change of the refractive index of the negative adjusting plates with the temperature to make the optical path difference OPL invariant with changes in the environment temperature and thereby to ensure the precision of the optical path.
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