FIELD: optics.
SUBSTANCE: invention relates to optical instrument-making and relates to a spectrograph. Spectrograph includes a body, which wall has the first, the second and the third holes, the input slot located in the first hole, the dispersion element located in the second hole and the detector located in the third hole. Dispersion element has a contour having dimensions for contact with protrusions that extend into the second opening. Projections and contour of dispersion element have complementary parameters of sizes and tolerances such that contour of dispersion element contacts all projections so that orientation of dispersion element relative to input slot is fixed.
EFFECT: technical result consists in increase of light energy in required spectral range and simplification of device adjustment procedure.
18 cl, 5 dwg
