Microsystem 671 nm light source for shifted excitation Raman difference spectroscopy

M. Maiwald^a, H. Schmidt^b, B. Sumpf^a, G. Erbert^a, H.-D. Kronfeldt^b, and G. Tränkle^a

^a Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
^b TU Berlin, Institut für Optik und Atomare Physik, Hardenbergstraße 36A, 10623 Berlin

Published in:
Appl. Opt., vol. 48, no. 15, pp. 2789-2792 (2009).
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Abstract:
We present a compact wavelength stabilized diode laser system at 671 nm 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 100 pm and a constant wavelength shift of 0.57±0.06 nm is obtained up to output powers of 250 mW. 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.

OCIS Codes:
(140.2020) Lasers and laser optics : Diode lasers; (140.4780) Lasers and laser optics : Optical resonators; (230.3990) Optical devices : Micro-optical devices; (300.6260) Spectroscopy : Spectroscopy, diode lasers; (300.6450) Spectroscopy : Spectroscopy, Raman.

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