Review about Semiconductor Laser

Abstract

The pulse of a laser beam can be likened to a military battalion as all soldiers advance. In consistent, regular steps, while an ordinary lamp radiates light in irregular, scattered light waves, it does not have the energy of a laser, so it is like people in the street, each of them facing a different direction than the other. However, by using crystals of suitable materials (such as ruby red) of high purity, it is possible to stimulate their production of light rays of one color. (i.e., of one wavelength) and also of one wavelength, then the waves match each other - by being reflected several times between two mirrors inside the laser crystal, so they become like soldiers in a battalion - The waves are organized, have constructive interference, and emerge from the device with the desired high energy, for the button, A laser or light amplification by stimulated emission of radiation is a device that emits light through a photonic amplification process based on the stimulated emission of electromagnetic radiation. Its photons are equal in frequency and identical in wave phase, where they constructively interfere between, Its waves are transformed into a high-energy optical pulse that is highly coherent in time and space, with a very small angle of departure, which is something that cannot be achieved using techniques other than radiation stimulation.