Chalcogenide Ge-Sb-S glasses have drawn renewed attention in recent years as they do not contain any dangerous elements such as commonly used As, have a wide range of optical transmission, good solubility of rare-earth elements, large glass-forming region and stability of prepared glasses. We were focused on the role of the chemical composition on the microlenses and microcraters in stoichiometric (GeS₂)_x(Sb₂S₃)_1-x and over/under-stoichiometric Ge-Sb-S glasses. The optically polished surface was structured by a) the UV ns (213 nm, 5 ns) laser forming microcraters by the ablation process; b) the CW 532 nm laser forming expanded microlenses by the thermal expansion and c) the CW 785 nm laser forming microcraters by the explosive boiling. The set of glasses was carefully characterized for information about optical penetration depth (UV-Vis spectroscopy), structure and chemical composition of the non-illuminated glass and microlenses (micro-Raman and EDX spectroscopies), thermal behavior (glass-forming temperature and thermal conductivity) and photo-induced changes of the hardness (nanoindentation). The materials were illuminated by the different laser power densities and the basic information about topography was measured by the atomic force and digital holographic microscopes (AFM and DHM). This set of data enables us to receive information about threshold power density for the formation of mentioned microobjects and effective penetration depth of photons (213 – 785 nm) and correlate them with the chemical composition of glasses.