Quantitative measurements of C02 and CH4 using a multipass Raman capillary cell

William F. Pearman, J. Chance Carter, S. Michael Angel, James W Chan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Raman measurements of two common gases are made using a simple multipass capillary Raman cell (MCC) coupled to an unfiltered 18 around 1 fiber-optic Raman probe. The MCC, which is fabricated by chemical deposition of silver on the inner walls of a 2 mm inner diameter glass capillary tube, gives up to 20-fold signal enhancements for nonabsorbing gases. The device is relatively small and suitable for remote and in situ Raman measurements with optical fibers. The optical behavior of the MCC is similar to previously described liquid-core waveguides and hollow metal-coated waveguides used for laser transmission, but unlike the former devices, the MCC is generally applicable to a very wide range of nonabsorbing gases.

Original languageEnglish (US)
Pages (from-to)4627-4632
Number of pages6
JournalApplied Optics
Issue number25
StatePublished - Sep 1 2008
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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