Microsystem Light Source at 488 nm for Shifted Excitation Resonance Raman Difference Spectroscopy

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Abstract:

A microsystem light source emitting at 488 nm was tested and applied as a light source for shifted excitation resonance Raman difference spectroscopy (SERRDS). A nonlinear frequency conversion using a distributed feedback (DFB) diode laser emission at 976 nm and a periodically poled lithium niobate (PPLN) waveguide crystal was realized on a micro-optical bench with a footprint of 25 mm × 5 mm. Joint temperature management via the microbench is used for wavelength tuning. Two emission lines at 487.61 nm and 487.91 nm are used for the SERRDS experiments. The Raman spectra of the test sample polystyrene demonstrate that a laser bandpass filter did not need to be implemented. Resonance Raman spectra of Tartrazine (FD&C Yellow 5, E 102) in distilled water are presented to demonstrate the suitability of this light source for SERRDS in, e.g., food safety control.

Keywords: 488 NM; DIODE LASER; FOOD SAFETY CONTROL; MICROSYSTEM LIGHT SOURCE; RAMAN SPECTROSCOPY; SECOND-HARMONIC GENERATION; SERRDS; SHG; SHIFTED EXCITATION RESONANCE RAMAN DIFFERENCE SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209789806803

Affiliations: 1: Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany 2: Technische Universität Berlin, Institut für Optik und Atomare Physik, Hardenbergstr. 36, D-10623 Berlin, Germany

Publication date: November 1, 2009

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