Abstract: The invention relates to a chamber for analyzing a sample by means of Raman spectroscopy, characterized in that the chamber is provided in the form of an opaque parallelepiped having: (a) on one of the vertical walls thereof, a hatch for introducing a sample; (b) on the bottom wall thereof, a first opening, and means (4) for attaching a light source, for providing excitation radiation, and a lens (22) enabling the convergence of the excitation radiation so as to define a focal point for the excitation radiation; and (c) a second opening and means for attaching a sensor enabling the Raman scattered light to be detected on a vertical wall or the bottom wall, said attachment means (4) including adjustment means (8) for varying said focal point of the excitation radiation along a vertical axis, so as to enable an adjustment of the height of said focal point within the analysis chamber.