1. A confocal microscope for imaging a sample comprising at least a light source, said microscope comprising at least one objective and a tube lens with an image focus, said microscope comprising interference means constructed to generate interference figures from said light source, wherein said interference means comprise first image generation means constructed to generate the first image of said light source, second image generation means constructed to generate a second image of said light source symmetrical to the first image relative to the image focus, image interference means constructed to make said first image and said second image interfere.