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Compound parabolic concentrator probe for efficient light collection in spectroscopy of biological tissue

Compound parabolic concentrator probe for efficient light collection in spectroscopy of biological tissue

Applied Optics 35(4): 758-763

We describe a compound parabolic concentrator (CPC)-based probe for enhanced signal collection in the spectroscopy of biological tissues. Theoretical considerations governing signal enhancement compared with conventional collection methods are given. A ray-tracing program was used to analyze the throughput of CPC's with shape deviations and surface imperfections. A modified CPC shape with 99% throughput was discovered. A 4.4-mm-long CPC was manufactured and incorporated into an optical fiber-based near-infrared Raman spectrometer system. For human tissue samples, light collection was enhanced by a factor of 7 compared with collection with 0.29-NA optical fibers.

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Accession: 052269209

Download citation: RISBibTeXText

PMID: 21069066

DOI: 10.1364/AO.35.000758

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