Sensitivity enhancement and fringe reduction in tunable diode laser spectroscopy using hemispherical diffusers

The use of diffuse, highly reflective optical components, in particular, a hemispherical BaSO4 diffuser, at the point of light injection into non-transparent or turbid media was evaluated as a means to increase the measurement sensitivity of spectroscopic absorption measurements. By performing the l...

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Veröffentlicht in:Review of scientific instruments 2017-05, Vol.88 (5), p.053111-053111
Hauptverfasser: Lundin, Patrik, Karlsson, Marcus, Mei, Liang, Larsson, Jim, Somesfalean, Gabriel, Svanberg, Sune
Format: Artikel
Sprache:eng
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Zusammenfassung:The use of diffuse, highly reflective optical components, in particular, a hemispherical BaSO4 diffuser, at the point of light injection into non-transparent or turbid media was evaluated as a means to increase the measurement sensitivity of spectroscopic absorption measurements. By performing the light injection from, e.g., an optical fiber through a component designed to make the light diffuse and to reflect (and thereby re-inject) light scattered from the sample, the total amount of light delivered into the sample is increased. Further, the occurrence of possible interference fringes is strongly reduced.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4983807