Tunable optical filters using cascaded etalons
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United States of America Patent
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Issued Date -
Mar 29, 2012
app pub date -
Sep 23, 2010
filing date -
Sep 23, 2010
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Abandoned
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Abstract
A temperature-tuned dielectric-slab-etalon scanning spectrometer that is low cost and simple to fabricate uses cascaded etalon modules, each module comprising a Fabry-Perot (FP) etalon having a relatively small Free Spectral Range (FSR), with at least two modules provided with a temperature control. According to the invention, the multiple FP modules produce Vernier tuning control. In these devices, the tuning temperature range is typically less than 10° C., and the required slab thickness may be less than 1 mm. This reduces fabrication and material requirements, and results in lower device cost and improved reliability.
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