Monday, February 15, 2016

Photons inducing Directionality in Stimulated emissions of lasers


While studying stimulated emissions, I was wondering how could a photon introduce directionality into another photon emitted by an excited electron just by mere stimulation.


How exactly does this 'stimulation' occur and how can this introduce directionality, because the stimulating photon and the emitted photon travel in the same direction.


[What I know is that if the excited electron(initially at rest) emits a photon, the photon can be emitted in any direction and the electron would recoil in the opposite direction to account for conservation of momentum in the system. But when stimulated emission happens why does the emitted photon travel in the same direction as the stimulating photon?]




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