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Multiplex coherent raman spectroscopy detector and method

United States Patent

June 8, 2004
View the Complete Patent at the US Patent & Trademark Office
A multiplex coherent Raman spectrometer (10) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer (10) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell (20) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator (28) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell (38) that receives gases separated by a gas chromatograph (40). The Raman radiation scattered from these gases is filtered and sent to a monochromator (50) with multichannel detection.
Chen; Peter (Atlanta, GA), Joyner; Candace C. (Austell, GA), Patrick; Sheena T. (Durham, NC), Guyer; Dean R. (Bellevue, WA)
Spelman College (Atlanta, GA)
10/ 450,403
June 13, 2003
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with Government support under National Science Foundation grant CHE-9702087, NASA Faculty Awards for Research grant NAG3-1974 and NASA grant NCC3-758, and Department of Energy grant DE-FG01-96EW13219. The Government has certain rights in this invention.