Abstract
Shifted excitation Raman difference spectroscopy (SERDS) using a dual-wavelength laser diode laser as excitation light source at 671 nm is presented. This device has a size of 3 mm x 0.5 mm and contains two laser cavities with wavelengths adjusted by distributed Bragg reflector (DBR) gratings as rear side mirrors. An integrated Y-branch coupler guides the emission into a common output aperture. The two wavelengths are centered at 671 nm with a well-defined spectral spacing of about 10 cm<sup>-1</sup>. An output power up to 100 mW is achieved. Raman experiments using polystyrene as test sample and ambient light to disturb the Raman signals demonstrate the suitability of such light source for SERDS.
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