Laser surgery uses a light beam to remove diseased tissue or treat blood vessels. Some types of cosmetic surgery use a laser source.

Helpful Link

National Library of Medicine
http://www.nlm.nih.gov/medlineplus/ency/article/007016.htm

American Society of Dermatologic Society
http://asds-net.org/Patients/FactSheets/patients-Fact_Sheet-lasers.html