Abstract

We present a compact wavelength stabilized diode laser system at 671nm on a micro-optical bench as a light source for shifted excitation Raman difference spectroscopy (SERDS). The laser system consists of two broad-area gain media in separate laser cavities using two reflection Bragg gratings with slightly different center wavelengths. A spectral width below 100pm and a constant wavelength shift of 0.57±0.06nm is obtained up to output powers of 250mW. The suitability of this light source for SERDS is demonstrated using Raman spectra of ethanol with increasing concentrations of Cresyl Violet as the fluorescent contaminant.

© 2009 Optical Society of America

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