This spectrometer, designed by Michel Leclercq, Alain Th茅venon and Jo毛l Oswalt, is based on the use of a new type of holographic grating (PACHTM), patented for their correction of optical aberrations. It obtains the spectra of the vibrational structure (molecular analysis) of a sample analyzed with a very high spatial resolution and vibrational energy. Modular and flexible in configuration, this device remains the gold standard for Raman spectroscopy throughout the world today.