Multiple-notch rugate filters and a controlled method of manufacture thereof
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United States of America Patent
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Apr 23, 1991
Grant Date -
N/A
app pub date -
Aug 17, 1989
filing date -
Aug 17, 1989
priority date (Note) -
Expired
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Abstract
An error-compensated process for forming a multiple-notch optical filter which is characterized by a continually and accurately varying periodic profile. The optical medium if formed on a substrate so that the profile of the refractive index is multiply sinusoidally modulated to maintain Bragg's law for each component in the multiple-notch profile. In a preferred embodiment, as the optical medium is coated on the substrate, the depositing film is monitored by optical techniques, and feedback information is provided to a computer driven by a pre-programmed process control algorithm so that real time control of the manufacturing process may be accomplished.
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