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Dual-etalon cavity ring-down frequency-comb spectroscopy with broad band light source

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United States Patent

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8,693,004
April 8, 2014
View the Complete Patent at the US Patent & Trademark Office
Dual-Etalon Frequency-Comb Spectrometer
In an embodiment, a dual-etalon cavity-ring-down frequency-comb spectrometer system is described. A broad band light source is split into two beams. One beam travels through a first etalon and a sample under test, while the other beam travels through a second etalon, and the two beams are recombined onto a single detector. If the free spectral ranges ("FSR") of the two etalons are not identical, the interference pattern at the detector will consist of a series of beat frequencies. By monitoring these beat frequencies, optical frequencies where light is absorbed may be determined.
13/ 050,430
March 17, 2011
356/454 356/484356/497
G01B 9/02 (20060101)
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STATEMENT REGARDING GOVERNMENT RESEARCH AND DEVELOPMENT This invention was made with Government support under government contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention, including a paid-up license and the right, in limited circumstances, to require the owner of any patent issuing in this invention to license others on reasonable terms.