Applied Physics I: Chapter 10: Applied Optics - Lasers
Principle of Laser action
Due to stimulated emission, the photons multiply in each step giving rise to an intense beam of photons that are coherent and moving in the same direction.
PRINCIPLE
OF LASER ACTION
Let
us consider many number of atoms in the excited state. We know the photons
emitted during stimulated emission has the same frequency, energy and are in
phase as the incident photon. Thus results in 2 photons of similar properties.
These two photons induce stimulated emission of 2 atoms in excited state
thereby resulting in 4 photons. This 4 photons induce 4 more atoms and give
rise to 8 photons etc., as shown in Fig.10.7.
Principle:
Due
to stimulated emission, the photons multiply in each step giving rise to an
intense beam of photons that are coherent and moving in the same direction.
Hence the Light is Amplified by Stimulated Emission of Radiation, termed as LASER.
Applied Physics I: Chapter 10: Applied Optics - Lasers : Tag: Applied Physics : - Principle of Laser action
Applied Physics I: Chapter 10: Applied Optics - Lasers
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