M. Rusu, A. Velea, M. Popescu, The modification induced by UV radiation in spherical microlenses made of glassy arsenic sulphide, J. Optoelectron. Adv. Mater. , 10/12 (2008) 3169 - 3171

Title: The modification induced by UV radiation in spherical microlenses made of glassy arsenic sulphide

Abstract: Spherical arsenic chalcogenide glass microlenses have been attached to optical fibers. The assembly was subjected to UV-radiation for different time intervals in different conditions of temperature. As a consequence, the focusing of the beam changes due to the modification of the refractive index, and of the structure, induced by photo-melting followed by crystallization. In the same time for high irradiation times the habitus of the lens changes into a prismatic one due probably to photomelting of the glass accompanied by a crystallization process.

Key words: Arsenic sulphide; Glass; Chalcogenide; UV light; Microlenses; Photo-crystallization