Remote Raman Microimaging Using an AOTF and a Spatially Coherent Microfiber Optical Probe

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Abstract:

A fiber-optic Raman microimaging probe is described that is suitable for acquiring high-spatial-resolution Raman images in sampling situations with no clear line of sight. A high-power near-infrared diode laser combined with an acousto-optic tunable filter and a spatially coherent optical fiber bundle allow fluorescence-free Raman images of remotely located samples to be acquired at distances up to several meters. The feasibility of this technique is demonstrated with Raman images of (1) a pellet containing a mixture of a highly scattering sample, bis-methylstyrylbenzene (BMSB), KCl, and graphite, and (2) a partially graphitized diamond. These images clearly show phase boundaries over an area of approximately 0.1 mm2 with ~4-μm resolution.

Keywords: AOTF; Fiber-optic Raman; Raman endoscopy; Raman imaging; Raman microprobe; Raman spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963905330

Affiliations: 1: Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208 2: Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208; Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822 3: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822

Publication date: August 1, 1996

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