What is laser diode and its working principle?
What is laser diode and its working principle?
The laser diode works on the principle that every atom in its excited state can emit photons if electrons at higher energy level are provided with an external source of energy. There are basically three phenomena by which an atom can emit light energy and that are Absorption, Spontaneous Emission & Stimulated emission.
Which semiconductor is used in laser diode?
Gallium arsenide, indium phosphide, gallium antimonide, and gallium nitride are all examples of compound semiconductor materials that can be used to create junction diodes that emit light.
Why are semiconductors used in lasers?
Semiconductor Laser is used for a variety of applications by taking advantage of characteristics that include straightness, small emission spot size (several um), monochromaticity, high light density, and coherence.
What are characteristics of laser diode?
Characteristics of Laser Diode
- Monochromatic: An insubstantial width of radiated narrow light containing only a single color.
- Well-directed: In this type, the light is will be directed in a narrow beam.
- Coherent: A light with a single wavelength emitted by LED with a wide wavelength.
What type of semiconductor emits laser light?
The material which often used in semiconductor laser is the gallium Arsenide, therefore semiconductor laser is sometimes known as Gallium Arsenide Laser.
What do you understand by semiconductor laser?
A solid-state laser constructed like a semiconductor diode. At the junction of anode and cathode, electrons and holes come together; when an electron falls into a hole, bandgap radiation is emitted, as in a light emitting diode.
What is the application of laser diode?
Applications of Laser Diode Consumer electronics: This includes laser printers, CDs and DVD players, and fiber optic communication. Industrial applications: When it comes to industrial applications, laser diodes are preferred as it is a source of a high-intensity laser beam and used for cutting, drilling, welding, etc.
What is semiconductor diode and its application?
SEMICONDUCTOR DIODES AND DIODE SYMBOL: A diode allows unidirectional flow of current and it restrains the flow in opposite direction. 1. Its main advantages are cheapness, smaller size, robustness and high efficiency. 2. Major application is rectification which is conversion of ac to dc.