Spectroscopic analysis using a hybrid LIBS-Raman system

A novel setup, combining two spectroscopic techniques, laser induced breakdown spectroscopy (LIBS) and Raman spectroscopy in a hybrid unit, is described. Aim of this work is to demonstrate the applicability of the hybrid LIBS-Raman unit as an analytical tool for the investigation of samples and objects of cultural heritage. The system utilizes a nanosecond pulsed Nd:YAG laser (532 nm) for both LIBS and Raman analysis. In the Raman mode, a low intensity beam from the laser probes the sample surface and the signal is collected into a grating spectrograph coupled to an ICCD detector, which records the Raman spectrum. In the LIBS mode, a single high intensity pulse from the laser irradiates the sample surface and the time- and spectrally-resolved emission from the resulting plume yields the LIBS spectrum. Several model pigment and mineral samples were examined and the data obtained show the ability of the hybrid unit to record both Raman and LIBS spectra from the same point on the sample, a clear advantage over the use of different analytical setups.