A weaponry target mechanism has a base having two pivot points, two support arms each pivotally connected to one of the pivot points, a third arm pivotally connected to the two support arms, and a platform pivotally connected to the third arm and pivotally connected by a fourth arm to one of the support arms. The process conditions include a preset film thickness of a thin film to be formed on a target substrate. The configuration and relative positioning of the lenses, along with the relative movement of the zoom lens, allows a laser transmitted through the lens system to be focused with a minimal spot size over a significant scanning field size and over a range of depths. rN, each having one of M transmitted phases. Thereby, the stability and effectiveness of the optical compact disk drive assembled with the sliding mechanism of the invention is increased.