1. An apparatus, comprising: a light beam scanning device configured to scan a light beam, within a scan range, over a scene that is within a field of view of the scan range and generate an image map of at least a portion of the scene, based at least in part upon a time of flight of the light beam to and from one or more points within the scene, wherein the light beam scanning device comprises: a lens element assembly comprising a plurality of lens elements and configured to dynamically adjust a divergence and diameter of the light beam, such that a spot size of the light beam is adjusted, wherein at least one lens element of the plurality of lens elements is configured to be adjustable, in a direction parallel to a direction of the light beam, relative to at least one other lens element of the plurality of lens elements to dynamically adjust a diameter of the light beam along at least one axis of the light beam, relative to a diameter of the light beam along at least one other axis of the beam.