Uses of LASER: (a) Communication for holograms production, CD, VCD, DVD playing, data transfer, fiber-optic cable and space communication. (b) Medicine - for welding retina of the eye, cervical cancer surgery, boring holes in the skull, cauterizing blood vessels, testing biological samples, monitoring glucose level in diabetic patient, dentistry, etc. (c) Security - for guidance system of missiles, aircrafts and satellites, generation of isotopes for nuclear weapons or reactors or enriched uranium production.