Rare-earth-doped glass fiber for background rejection in remote fiber-optic Raman probes: Theory and analysis of holmium-bearing glass

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Applied Spectroscopy; (United States)

DOI:https://doi.org/10.1366/0003702934334624· OSTI ID:5042788

Cooney, T F; Schoen, C L; Sharma, S K ^[1]; Carey, D M ^[2]

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1. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
2. Rensselaer Polytechnic Institue, Troy, NY (United States)

The authors have investigated the feasibility of using rare-earth-doped glasses in [open quotes]self-filtering[close quotes] optical fibers used for remote Raman spectral collection. They have derived a theoretical treatment and have used the measured relevant sample and glass parameters (e.g., optical absorption of the doped glass and ratio of the intensities of inelastic scattering to elastic scattering plus reflection) to evaluate the usefulness of such fibers. With the use of these parameters, the optical absorption bands of Ho-doped glass, in particular, are found to be sufficiently intense and sharp to enable this glass to be used in the the collection fiber of a remote Raman probe. Ho-doped glass fiber of as little as 2 cm in length is sufficient to filter undesirable laser radiation while permitting a high proportion of the sample Raman signal to pass. Use of the 488.0-nm Ar[sup +] laser line or green or red laser wavelengths from a [open quotes]tunable[close quotes] laser can ensure that the excitation is within an absorption band and close to the long-wavelength transmission cut-on for the doped glass. 4 refs., 12 figs., 2 tabs.

• OSTI ID: 5042788
• Journal Information: Applied Spectroscopy; (United States), Journal Name: Applied Spectroscopy; (United States) Vol. 47:10; ISSN 0003-7028; ISSN APSPA4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ABSORPTION SPECTRA
CRYSTAL DOPING
DESIGN
ELEMENTS
FIBERS
FILTERS
HOLMIUM
LASER SPECTROSCOPY
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
METALS
OPTICAL FIBERS
OPTICAL FILTERS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PROBES
RAMAN SPECTROSCOPY
RARE EARTHS
SPECTRA
SPECTROMETERS
SPECTROSCOPY