Abstract
Abstract Fourier transform Raman instruments invariably incorporate Nd:YAG solid state lasers operating at 1064 nm. Recently, new lasers have appeared which are likely to be of appropriate power and linewidth for Raman spectroscopy and to be very economical. They emit at various wavelengths between the deep red and one micron wavelength. We have investigated whether sources in this domain are as satisfactory as Nd:YAG ones and conclude that where samples display even the slightest fluorescence with 1064 nm excitation this will be worse if shorter wavelength sources are used and unacceptably so if the source is of shorter wavelength than 900 nm. Thus as a routine analytical tool new improved sources are essential and many of the newer sources are unlikely to be satisfactory.
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