EXPORT CITATION

Chapter-49 History and Physics of Lasers: Dermatologic Lasers and their Evolution

BOOK TITLE: ACS(I) Textbook on Cutaneous and Aesthetic Surgery

Author
1. Omprakash HM
ISBN
9789350258903
DOI
10.5005/jp/books/11651_71
Edition
1/e
Publishing Year
2012
Pages
14
Author Affiliations
1. Vikram Hospital, Mysore, Karnataka, India, Vikram Hospital, Mysore, India, drhmomprakash@yahoo.com, Vikram Hospital, Mysuru, Karnataka, India
Chapter keywords

Abstract

“Lasers are, to other sources of light, as music is to noise” aptly describes the uniqueness of Lasers. The very word, LASER (an acronym; Light Amplification by Stimulated Emission of Radiation) gives an insight to its creation. Laser is emission of a radiation which is stimulated, and light amplifies it further. The term LASER was coined by Gordon Gould on November 13, 1957, then in his late 40s. Gould, a graduate student at Columbia University working for his PhD dissertation, during his spare time thought of creating LASER. He had the idea, but not the financial backing to realize his dreams. He jotted his concepts in a laboratory notebook and as to its uses he wrote—“it could be used as a spectrometer. The beam could travel long distances essentially unweakened. Applications like communications and radar are obvious.” Nearly three years later, on May 16, 1960 Theodore Maiman, a young 32-year old physicist working for Hughes Research Laboratories in California created the first working laser. Maiman, as to its uses noted five uses: Fiber optic communication, laser spectroscopy, space communication, industry: laser cutting, welding and medicine. But in the present day scenario, lasers are ubiquitous. People speed through the supermarket checkout lines, use computers with virtually unlimited storage, communicate via a cable that carries their voices by the thousands along the beams of light, listen to music and watch movies in different ways because of lasers. Measurements are easier to make and more precise. Manufacturers weld and drill holes with lasers. Presidents and generals dream of them as both swords and shields. Doctors dream of using lasers as a cure for all diseases. So what is this magic wand? The key principles here are: atoms spontaneously emit radiation, and this radiation could be augmented by light. Sounds simple high school science. But to enjoy the laser creation and its application, one has to travel back, along the time machine.

Related Books

© 2019 Jaypee Brothers Medical Publishers (P) LTD.   |   All Rights Reserved