![]() So let’s look at a few disadvantages:Įxpensive as compared to other light-emitting devices.Ī laser diode is a temperature-dependent device, and its operations get affected by the rising temperature. Just like the coin has two sides, a laser diode also does, it has a few advantages with a big list of advantages, as nothing is perfect. Low cost of manufacturing and operations.Įasily portable due to small size and internal architecture. We find various advantages of using laser diodes let’s have a look at these: Lasers have the same phase and frequency. Lasers are coherent - Light emitted is of a single wavelength. Lasers have the same frequency and wavelength. Monochromaticity - Laser diodes emit a narrow light containing a single colour. Highly directive - Light emitted by laser diodes is directed into a narrow beam that can be easily launched through an optical fibre. ![]() The laser has the following characteristics: In this way, we get two photons emitting out in the form of light.Ī laser has several scientific, commercial, and medical applications. Already one electron is reaching the valence band however, because of striking with a photon, an extra electron also reaches the valence band. ![]() So, what happens here is when we strike a photon (in the form of light energy) with the electron in the conduction band (CB). In this process, we strike a photon with an electron to get the light that we can see in the image below: However, a laser diode works on stimulated emission. Generally, an electron while migrating to the lower energy level releases energy equal to the gap between them and chances are they come back after absorbing energy. Laser diodes provide a light of the same frequency.Ī laser diode works on the principle of stimulated emission and so emissions occur in three types: Biasing means supplying power to the diode. The front face is attached with metal contacts to allow biassing in the semiconductor. The front is completely polished this surface acts as a reflecting surface or a mirror while the side view is partially polished which acts as a partially reflecting surface. This active layer often consists of a Quantum well and is made of an intrinsic semiconductor (intrinsic semiconductor means undoped or pure or natural semiconductor).Ī depletion layer is between the two semiconductors because by applying a voltage to the diode, the electron-hole combination occurs. The construction of laser diodes is similar to LED, the only difference is that an active layer is made between these two semiconductors. These semiconductors are made of Gallium arsenide and they are doped with Selenium, Aluminium, or Silicon. We can use the two classes of laser diode - one produces light emissions by itself and another one uses an external source.Ī laser diode has the following components about which we will discuss in detail by the construction of the laser diode:Ī laser diode is made of two semiconductor layers viz: P-type and N-type semiconductor. Laser diodes are used as light sources in optical communication. It comprises the following components:Ĭommon types of laser diodes used in telecommunication are: A semiconductor laser that is used for signal transmission in optical fibre is the laser diode, where LASER stands for Light Amplification by Stimulated Emission of Radiation.Ī laser diode is like a light-emitting diode that emits a high-powered light through a glass lens to reduce signal loss.Ī laser diode is also called an injection laser diode.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |