  Hard X / soft gamma-ray polarimetric analysis can be performed efficiently by
the study of Compton scattering anisotropy in a detector composed of fine
pixels. But in the energy range above 100 keV where sources flux are extremely
weak and instrumental background very strong, such delicate measurement is
actually very difficult to perform. Laue lens is an emerging technology based
on diffraction in crystals allowing the concentration of soft gamma rays. This
kind of optics can be applied to realize an efficient high-sensitivity and
high-angular resolution telescope, at the cost of a field of view reduced to a
few arcmin though. A 20 m focal length telescope concept focusing in the 100
keV - 600 keV energy range is taken as example here to show that recent
progresses in the domain of high-reflectivity crystals can lead to very
appealing performance. The Laue lens being fully transparent to polarization,
this kind of telescope would be well suited to perform polarimetric studies
since the ideal focal plan is a stack of finely pixelated planar detectors - in
order to reconstruct the point spread function - which is also ideal to perform
Compton tracking of events.
