“…Therefore, in order to improve the process quality as well as reduce energy consumption, it is natural to hope the thermal energy to be largely confined to a small specific region to only make the materials therein evaporate without affecting the adjacent region [4]. In physics, this actually requires high spatial and temporal concentration of the laser energy, which could be realized through focusing the laser beam and shortening the laser duration [5]. From such point of view, one can immediately understand that the laser energy would be greatly wasted as too much material is heated up beyond the objective region if the laser power density is too low or the exposure duration is too long [6,7].…”