1. A laser beam detection apparatus comprising: an interference image production apparatus configured to produce an interference image from detected light radiation; an image recording device configured to record the interference image; and an image processing unit configured to process the interference image recorded by the image recording device to detect laser beams in the light radiation, the image processing unit including: a point detection component configured to detect a spatially defined point distribution from the interference image; a transformation component configured to transform the point distribution such that a grid interval remains between a point grid in the point distribution, and a fixed position, which is independent of a position of the point grid in the interference image, is associated with the point grid; a grid interval detection component configured to detect a grid interval in the point grid transformed by the transformation device; and a grid position detection component configured to detect the position of the point grid from the point distribution by filtering in consideration of the grid interval detected by the grid interval detection component.