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The concept of a gamma-ray telescope based on a Laue lens offers thepossibility to increase the sensitivity by more than an order of magnitude withrespect to existing instruments. Laue lenses have been developed by ourcollaboration for several years : the main achievement of this R&D program wasthe CLAIRE lens prototype. Since then, the endeavour has been oriented towardsthe development of efficient diffracting elements (crystal slabs), the aimbeing to step from a technological Laue lens to a scientifically exploitablelens. The latest mission concept featuring a gamma-ray lens is the EuropeanGamma-Ray Imager (GRI) which intends to make use of the Laue lens to coverenergies from 200 keV to 1300 keV.  Investigations of two promising materials, low mosaicity copper and gradientconcentration silicon-germanium are presented in this paper. The measurementshave been performed during three runs on beamline ID15A of the EuropeanSynchrotron Radiation Facility, and on the GAMS 4 instrument of the InstituteLaue-Langevin (both in Grenoble, France) using highly monochromatic beam ofenergy close to 500 keV. Despite it was not perfectly homogeneous, thepresented copper crystal exhibits peak reflectivity of 25% in accordance withtheoretical predictions, and a mosaicity around 26 arcsec, the ideal range forthe realization of a Laue lens such as GRI. Silicon-germanium featuring aconstant gradient have been measured for the very first time at 500 keV. Twosamples showed a quite homogeneous reflectivity reaching 26%, which is far fromthe 48% already observed in experimental crystals but a very encouragingbeginning. This results have been used to estimate the performance of the GRILaue lens design.

R&D progress on second-generation crystals for Laue lens applications