Laser-induced piezoelectricity in AgGaGe3–xSixSe8 chalcogenide single crystals Wojciech Kuznik, Piotr Rakus, Katarzyna Ozga, Oleh V. Parasyuk, Anatolii O. Fedorchuk, Lyudmyla V. Piskach, Andriy Krymus and Iwan V. Kityk Eur. Phys. J. Appl. Phys., 70 3 (2015) 30501 Published online: 09 June 2015 DOI: 10.1051/epjap/2015150103