Most of the Levi's that you wear are cut from thick stacks of denim material by laser. Holograms are produced with lasers. To make a hologram, the laser is split into two beams. Both beams are expanded with a lens. After a couple reflections from mirrors, one beam shines directly on the photographic plate, the other shines on the object being photographed.
Light reflects from the object and also exposes the plate.
The two sources combine and interfere with each other to create the hologram. If you took a hologram and broke it into many pieces, you'd notice that each piece has a complete picture of the object - but each fragment contains a picture from a different viewpoint. Holography can be used by scientists and engineers to make very accurate measurements of motion and shape changes. Many jobs are done by scanning a laser . Surveyors use these laser- generated planes to establish a level.