Encoded complex reconstruction into diffractive optical elements for high power Nd:YAG laser marking system

The applications of diffractive optical elements (DOE) in the domain of laser marking with a pulsed Nd:YAG laser are numerous, but few publications present usable results. In our opinion, the first usage with a Nd:YAG laser of a low cost DOE to mark complex forms such as industrial logos with a sufficient quality is presented in this paper. Besides, the manufacturing costs are very low and the necessary materials are very simple and few in our proposition. The elements have been manufactured by contact photolithography with a commercial resin, that one can find in a supermarket and a silver halide mask. Finally, the effects of the pulse duration on the reconstruction shape are evaluated and displayed with the help of marking test on sensitized paper.