The ILL's Neutron Optics Service develops and manufactures highly sophisticated optical components for the neutron instruments that guarantee the ILL's leading role in neutron scattering. It supplies the know-how and analysis and production capabilities for monochromator and analyser crystals, converging guides, bandpass and polarising 3He spin-filters, and supermirror devices.

The service is also involved in collaborative partnerships including training and technical development.