Operation of laser diode

Course Details

Field of Study: Electronics Engineering
Course Name: Optoelectronics
Subtitle: Operation of laser diode

When a p-n junction is forward biased by an external voltage source, the electrons move through the junction and recombines as in an ordinary diode.
When electrons recombine with holes, photons are released. These photons strikes atoms, causing more photon to be released. These photons strikes atoms, causing more photon to be released. As the forward bias current is increased, more electrons enter the depletion region and cause more photon to be emitted.

laser-diode

Eventually some of the photons that are randomly drifting within the depletion region strike the reflected surface perpendicularly, so that they are reflected back along their original path. The reflected photons are then again reflected back from the other end of the junction. This movement of photons from one end to the another end continues for many times.
During this movement of photons strike more atoms and release additional photons due to avalanche effect. This process of reflection and generation of increasing number of photons results a very intense beam of laser light.

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October 29, 2014 - In Academics, Electronics

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