Triple monochromator for Raman scattering with electronic coupling

An electronic coupled triple monochromator is presented. The system is composed of double and single monochromators coupled together electronically and controlled by a microcomputer. The tracking is obtained via a feedback loop between the motor's velocities and two shaft encoders which are connected to the lead screws. The resolution of the system was measured as a function of the slits width and the wavelength and is as good as the resolution of a double monochromator. The additional loss in light intensity results only from the reflection loss in the grating and in the mirrors of the third stage.