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Principle Of Diode Laser
- Sep 25, 2018 -

The p-n junction in the laser diode is formed by two doped gallium arsenide layers. It has two flat ends, parallel to one end mirror (highly reflective surface) and a partial reflection. The wavelength of light to be emitted is directly related to the length of the junction. When the p-n junction is positively offset by an external voltage source, the electrons move through the junction and are reassembled like ordinary diodes. When electrons and holes are combined, photons are released. These photons strike atoms, causing more photons to be released. As the forward bias current increases, more electrons enter the depleted region and more photons are emitted.