“…Figure 1 shows the variations of diffraction efficiency with exposition for holographic diffraction gratings with a spatial frequency of 500 mm −1 fabricated using both conventional (curves 2, 5) and corona discharge-assisted (curves 1, 3, 4) recording methods (note that a similar figure can be found in [11]). As can be seen, with negative corona discharge, the sensitivity of Cu-As 2 Se 3 structure was enhanced and the diffraction efficiency of inscribed gratings was raised (compare curves in pairs 1, 2 and 4, 5).…”