6
Lasers
THIS CHAPTER COVERS…
- The basic properties of lasers and principles of their production including light amplification techniques, population inversion.
- The mechanisms of energizing or pumping of different media like He-Ne, Ruby.
- The working of different types of lasers.
- Some important military, civil and industrial applications of lasers.
6.1 LASER (LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION)
An electron in an atom in an excited state emits a photon while returning to a lower state. This is a random and spontaneous emission. However, if a photon possesses considerable energy it will be stimulated to emit the photon sooner. This photon emitted by stimulated emission looks exactly like the incoming photon that caused ...
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