Intensity considerations in liquid core optical fiber Raman spectroscopy

Robert Altkorn*, Michelle Duval Malinsky, Richard P Van Duyne, Ilia Koev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


This paper develops expressions for the Raman power emitted by liquid core optical fiber (LCOF) sample cells in six simple excitation/collection geometries and the fraction of that power that can be utilized in a conventional Raman spectrometer. From these expressions a "figure of merit" is developed that can be used to predict the relative intensity enhancement provided by LCOFs having different inside diameters and loss characteristics. For the apparatus used here, we show theoretically and experimentally that the figure of merit takes the simple form (αd)-1 where α and d are, respectively, the loss coefficient and inside diameter of the LCOF. Given the varying optical quality of Teflon®-AF LCOFs currently in use, the analysis presented here should be useful in optimizing the performance of LCOF accessories in Raman and related spectroscopic applications.

Original languageEnglish (US)
Pages (from-to)373-381
Number of pages9
JournalApplied Spectroscopy
Issue number4
StatePublished - Apr 1 2001


  • LCOFs
  • Liquid core optical fibers
  • Raman spectroscopy

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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