Optical filter and optical apparatus
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United States of America Patent
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Mar 7, 2017
Grant Date -
Mar 13, 2014
app pub date -
May 17, 2012
filing date -
May 17, 2011
priority date (Note) -
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Abstract
There is provided an optical filter of the type having absorption and with low reflection, which includes a light-transmitting substrate; and a light-absorbing gradient refractive index thin film provided on the substrate and whose refractive index changes so as to be close to the refractive index of the substrate toward the substrate side in a film thickness direction. There is also provided an optical apparatus using the optical filter.
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