Abstract: A method and apparatus for determining a focus point of a laser system is described. A reference datum surface is aligned with a laser emitter arranged to emit a laser beam. A portion of the laser beam reflects from the reference datum surface and is captured by a photon detector. Based upon the captured photons, intensity level data is generated each time the laser emitter is moved relative to the reference datum surface. A maximum intensity level is then determined in accordance with the distance moved by the laser emitter associated with the focus point of the laser system. In some cases, an interpolation is performed to provide a more accurate determination of the location of the focus point, the interpolation being in one case a second order polynomial.