In this paper we describe the aggregate technology of producing variable composition crystals, based on the solid solutions of silver and Tl+-doped halides for creating infrared photonic crystal fibers in the spectral range of 2-40 mu m by extruding, we also produce all the necessary equipment. We specified the minimum melting point position for the AgCl-AgEr phase diagram. We also investigated the fundamental physical properties of new crystals and fibers: transmission losses, transmission range, refraction index, hardness, and density. (C) 2013 Elsevier B.V. All rights reserved.