A semiconductor device called a Laser Diode is equivalent to a light-emitting diode (LED). Coherent light is created via a p-n connection, where all waves have the same frequency and phase. The technique known as "Light Amplification by Stimulated Radiation Emission," or LASER, is used by a laser diode to emit this coherent light. The name "laser diode" comes from the fact that it produces laser light using a p-n junction.
Metal plates sandwiched between n-type and p-type layers are where the input terminals are fastened. The "Homojunction Laser Diode" is this kind of laser diode. The active region's volume is increased by using the intrinsic zone between p- and n-type materials so that more holes and electrons can gather at the junction. The output power is increased because it leads to more electrons recombining with holes at any given time. The elliptical area is where the laser light emerges. An optical lens can be utilised to further focus this laser diode's beam. A metal framework encloses the complete PIN diode (P-type, intrinsic, and N-type) structure.
There are three basic phenomena from which the atom can emit light energy.
· Absorption
· Spontaneous emission and
· Stimulated emission.
