Diode-pumped thulium-doped zirconium fluoride fibre as a fluorescent source for water sensing

Author

McAleavey, F.J. ; MacCraith, B.D.

Author_Institution

Sch. of Phys. Sci., Dublin City Univ., Ireland

Volume

31

Issue

16

fYear

1995

fDate

8/3/1995 12:00:00 AM

Firstpage

1379

Lastpage

1380

Abstract

Tm(3+)-doped zirconium fluoride fibre pumped with a low-cost diode laser at 785 nm is shown to function as a useful source for water or humidity sensing. The near-IR fluorescent emission band centred at 1.47 μm exhibits considerable overlap with an absorption band of H₂O. Using a variable path-length cell and the residual pump signal as a reference, the fluorescent fibre source is shown to enable measurement of path lengths as low as 1 μm in liquid water. In addition, using a declad fibre as an evanescent-wave absorption probe, the feasibility of measuring water concentrations in other liquids is demonstrated

Keywords

chemical variables measurement; fibre lasers; fluorescence; fluoride glasses; humidity sensors; measurement by laser beam; optical pumping; thulium; zirconium compounds; 1.47 micrometre; declad fibre; diode laser pump; evanescent-wave absorption probe; fluorescent source; humidity sensing; near-IR fluorescent emission band; residual pump signal; variable path-length cell; water concentrations; water sensing;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19950895

Filename

408338