Abstract

Raman spectroscopy becomes more and more important for various application fields e.g. food safety, detection of hazardous compounds, or medical diagnostics. Especially portable Raman sensor systems e.g. hand-held devices have shown a rapid growth of interest in the last years. Here, diode lasers are attractive excitation light sources. However, weak Raman signals can be obscured by fluorescence of e.g. organic and biological samples. Amongst others, shifted excitation Raman difference spectroscopy (SERDS) is a promising technique to separate Raman signals from a disturbing background. For SERDS a laser light source is necessary that provides two excitation wavelengths with a sufficient spectral distance of 10 cm^-1 for most solid and liquid samples [1]. Compact hybrid microsystem diode laser based light source emitting at 671 nm suitable for Raman spectroscopy [2] and SERDS [3] were realized on an AlN-microbench with a footprint of 20 mm × 5 mm.

© 2013 IEEE