Abstract: An inclined-slit spectrograph includes a light source, an inlet slit, a grating and a detector including window through which the light beam diffracted by the grating is transmitted with part of the diffracted light beam generating reflections on the window or between the window and the sensitive surface of the detector. A rectangular inclined inlet slit compensates for spectral resolution losses.

Abstract: The invention concerns a spectrograph with a tilted detector window comprising a light source (1), an entrance slit (3), a grating (4), a detector (5) comprising a window through which the light beam diffracted by the grating (4) is transmitted, a part of the diffracted light beam generating reflections on the window or between the window and sensitive surface of the detector (5) and at least a means for inclining able to avoid interference spectra. According to the invention, the at least a means for inclining able to avoid interference spectra comprises the detector window (6, 11) which is an inclined detector window (11).