A tunable multicolour `rainbow' filter for improved stress and dislocation density field mapping in polycrystals using X-ray Laue microdiffraction

A technique to measure the energy profiles of Laue spots in X-ray Laue microdiffraction is presented. It uses a single-crystal diamond filter that attenuates several well defined energies in the incident white-beam spectrum. A first application to lattice-parameter measurements is demonstrated.