Line Focus Method for Recording Laser Raman Spectra of Colored Solids

The problems caused by the local overheating of colored Raman samples when illuminated by a focused laser beam have been circumvented in the and methods by introducing a fast relative motion between the sample and the incident radiation which results in a very short stay of the sample molecules in the laser beam at any given instance. In the rotating cell method the sample cell is rotated while in the surface scanning method the point of incidence of the focused laser beam on the sample surface is moved by rotating an optical component (a refractor plate or the focusing lens) between the laser and the sample. Thus, both methods require a rotating device. Here we report a simple modification of the ordinary Raman scattering setup which has enabled us to obtain Raman spectra of colored solids and does not require any moving parts.