Called M1 and designed by Roland Gouley, this machine could engrave 600 grooves per millimeter on a surface. It marked the starting point of the whole adventure of diffraction gratings at Jobin Yvon, and then HORIBA FRANCE. The gratings are light scattering components designed to replace prisms inside spectroscopy equipment. Their field of application is therefore highly diversified, including telecommunications, semiconductors, analytical chemistry, biotechnologies, biomedical sector, food industry, and more.