Instabilities in laser direct writing due to non-uniform cross section of stripes

A self-consistent analytical description of laser direct writing based on a one-dimensional approach is presented. The cross section of the stripe has been assumed to be non-uniform; its width and height are calculated as a function of processing parameters. With high activation energies, when the height of the stripe becomes comparable with its width, the front edge of the stripe may become narrower than the region where the reaction of pyrolytic deposition is localized. This leads to nontrivial phenomena such as an interval of scanning velocities where continuous deposition becomes impossible.