Treatment of materials, namely, preparation of 3D structures by lasers, wherein the 3D structures are provided for optical packages, optical elements, microoptics, lenses, diffractive optical elements, MEMS/MOEMS, actors, biochips, microfluidic cells, scaffolds for tissue engineerings and implants, and for the preparation of masks, and preparation of 3D structures, made in connection with the said elements, and for the nano-imprint lithography, and Treatment of materials, namely, preparation ...