title: Ultraviolet Stand-off Raman Measurements Using a Gated Spatial Heterodyne Raman Spectrometer.
abstract: A spatial heterodyne Raman spectrometer (SHRS) is evaluated for stand-off Raman measurements in ambient light conditions using both ultraviolet (UV) and visible pulsed lasers with a gated ICCD detector. The wide acceptance angle of the SHRS simplifies optical coupling of the spectrometer to the telescope and does not require precise laser focusing or positioning of the laser on the sample. If the laser beam wanders or loses focus on the sample, as long as it is in the field of view of the SHRS, the Raman signal will still be collected. The SHRS is not overly susceptible to vibrations, and a vibration isolated optical table was not necessary for these measurements. The system performance was assessed by measuring stand-off UV and visible Raman spectra of a wide variety of materials at distances up to 18 m, using 266 nm and 532 nm pulsed lasers, with 12.4 in. and 3.8 in. aperture telescopes, respectively.
authors.affiliation: Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina, USA.
authors.forename: Nirmal
authors.initials: N
authors.lastname: Lamsal
authors.affiliation: Hawaii Institute of Geophysics & Planetology, University of Hawaii, Honolulu, Hawaii, USA.
authors.forename: Shiv K
authors.initials: SK
authors.lastname: Sharma
authors.affiliation: Hawaii Institute of Geophysics & Planetology, University of Hawaii, Honolulu, Hawaii, USA.
authors.forename: Tayro E
authors.initials: TE
authors.lastname: Acosta
authors.affiliation: Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina, USA smangel0@mailbox.sc.edu.
authors.forename: S Michael
authors.initials: SM
authors.lastname: Angel
keywords: FT Raman; Interferometry; Raman spectroscopy; Remote Raman; Spatial heterodyne Raman spectrometer (SHRS); Stand-off Raman; Ultraviolet (UV) Raman