Raman Spectroscopy
Spectroscopy can be summarized as the study of the interaction between light and matter. The result tells us something about the molecular and atomic nature of the material. In particular, Raman spectroscopy yields unique information by investigating the vibrational and rotational modes of the molecule.
CW DPSS lasers are typically used to avoid any damage to the sample. Much interest has been centred around NIR excitation wavelengths, however, the intensity of the NIR Raman signal is fairly weak. By using shorter wavelength lasers at 532nm, 473 nm or even 355 nm, there is complementary Raman information which can be collected.
Fig 1: Unprocessed resonance Raman spectra of [Ru(bpy)3]2+ in acetonitrile at 355 nm with (lower) continuous (10 mW) and pulsed (9 ns, 6 mJ per pulse). (Co Dr W. Brown, University of Groningen, The Netherlands)
All Cobolt lasers have narrow spectral bandwidth, spectral purity and a high level of wavelength stability, which are important features for Raman.
Fig 2: Spectral purity of a Cobolt Mambo™ 594nm
See all Cobolt CW Visible 04-01 Series DPSS lasers and CW UV-Visible-NIR 05-01 Series DPSS lasers.
References
G.Strömqvist et. al. Suppression of Raman scattering in PPKTP. ECLEO 2009
