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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 26 — Sep. 10, 2010
  • pp: 4951–4962

Time-resolved Raman spectroscopy for in situ planetary mineralogy

Jordana Blacksberg, George R. Rossman, and Anthony Gleckler  »View Author Affiliations


Applied Optics, Vol. 49, Issue 26, pp. 4951-4962 (2010)
http://dx.doi.org/10.1364/AO.49.004951


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Abstract

Planetary mineralogy can be revealed through a variety of remote sensing and in situ investigations that precede any plans for eventual sample return. We briefly review those techniques and focus on the capabilities for on-surface in situ examination of Mars, Venus, the Moon, asteroids, and other bodies. Over the past decade, Raman spectroscopy has continued to develop as a prime candidate for the next generation of in situ planetary instruments, as it provides definitive structural and compositional information of minerals in their natural geological context. Traditional continuous-wave Raman spectroscopy using a green laser suffers from fluorescence interference, which can be large (sometimes saturating the detector), particularly in altered minerals, which are of the greatest geophysical interest. Taking advantage of the fact that fluorescence occurs at a later time than the instantaneous Raman signal, we have developed a time-resolved Raman spectrometer that uses a streak camera and pulsed miniature microchip laser to provide picosecond time resolution. Our ability to observe the complete time evolution of Raman and fluorescence spectra in minerals makes this technique ideal for exploration of diverse planetary environments, some of which are expected to contain strong, if not overwhelming, fluorescence signatures. We discuss performance capability and present time-resolved pulsed Raman spectra collected from several highly fluorescent and Mars-relevant minerals. In particular, we have found that conventional Raman spectra from fine grained clays, sulfates, and phosphates exhibited large fluorescent signatures, but high quality spectra could be obtained using our time-resolved approach.

© 2010 Optical Society of America

OCIS Codes
(300.6190) Spectroscopy : Spectrometers
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6450) Spectroscopy : Spectroscopy, Raman
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Spectroscopy

History
Original Manuscript: April 12, 2010
Revised Manuscript: July 20, 2010
Manuscript Accepted: August 12, 2010
Published: September 8, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Citation
Jordana Blacksberg, George R. Rossman, and Anthony Gleckler, "Time-resolved Raman spectroscopy for in situ planetary mineralogy," Appl. Opt. 49, 4951-4962 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-26-4951

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