Multiplex coherent raman spectroscopy detector and method
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.
- Research Organization:
- Spelman College, Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG01-96EW13219
- Assignee:
- Spelman College
- Patent Number(s):
- 6,747,735
- Application Number:
- 10/450,403
- OSTI ID:
- 1174888
- Country of Publication:
- United States
- Language:
- English
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