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Journal of Spectroscopy
Volume 2013, Article ID 254964, 6 pages
http://dx.doi.org/10.1155/2013/254964
Research Article

Raman Spectroscopy of Iranian Region Calcite Using Pulsed Laser: An Approach of Fluorescence Suppression by Time-Gating Method

Laser and Plasma Research Institute, Shahid Beheshti University, G. C., Evin, Tehran 1983963113, Iran

Received 9 June 2012; Accepted 25 September 2012

Academic Editor: Petre Makreski

Copyright © 2013 H. Soleimaninejad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of time-gating method in Raman spectroscopy for fluorescence suppression of Iranian region calcite is investigated. Experiments are done using an Nd:YAG laser with a pulse durations of 10 ns at wavelength 532 nm. Seven samples from different places are examined. In order to obtain the optimum gate width for fluorescence suppression, a series of experiments is carried out at different gate widths. Raman-to-fluorescence (R/F) and fluorescence-to-laser peak (F/L) ratios are compared at gated and nongated experiments. Applying the optimum gate width leads to an effective reduction of fluorescence background and improvement in both ratios of R/F and F/L. Raman signals of some samples in nongated experiments are completely hidden by fluorescence while emerged in gated experiments.