Fiber-optic Raman probe based on single-crystal sapphire fiber

Tongqing Liu, Ming Han, Cody Raml, Dennis R. Alexander, Xiangnan He, Yongfeng Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We demonstrate a fiber-optic Raman probe based on single-crystal sapphire fibers to overcome the large background signal of Raman probes based on standard glass fibers. Using 514.5 nm and 785 nm excitation lasers, Raman spectroscopy was performed on samples of calcite, aqueous sodium carbonate solution, and silicon wafer using a single crystal sapphire fiber and a silica fiber of similar lengths and numerical apertures. The single-crystal sapphire fiber exhibits narrow Raman peaks and low background signal, allowing for the detection of weaker Raman signals or Raman signals located in the lower wavenumber region, while the traditional silica fiber has a strong broadband Raman spectrum of its own.

Original languageEnglish (US)
Title of host publicationNext-Generation Spectroscopic Technologies V
StatePublished - 2012
EventNext-Generation Spectroscopic Technologies V - Baltimore, MD, United States
Duration: Apr 23 2012Apr 24 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceNext-Generation Spectroscopic Technologies V
Country/TerritoryUnited States
CityBaltimore, MD


  • Raman
  • fiber optic sensors
  • sapphire fiber
  • spectroscopic instrumentation
  • spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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