What is the working of semiconductor laser?
A semiconductor laser (LD) is a device that causes laser oscillation by flowing an electric current to semiconductor. The mechanism of light emission is the same as a light-emitting diode (LED). Light is generated by flowing the forward current to a p-n junction.
What is semiconductor laser treatment?
The semiconductor laser directly on the deep tissue of the human body and the effective acupuncture point, the local point light stimuli can produce anti-inflammatory, antispasmodic, analgesic, improve microcirculation, regulate immune function and role, so that the correct joint disorder.
What are the advantages of semiconductor lasers?
The advantages of semiconductor lasers are: small volume, lightweight, good reliability, long service life, and low power consumption. In addition, semiconductor laser adopted low voltage constant current power supply mode, hence provided low powder failure rate, safe operation, and low cost of maintenance.
How semiconductor laser is useful in laser communication?
Semiconductor lasers have a tremendous potential for use in optical communication systems due to their high efficiency, small size, and direct modulation capability. Because of their small size, they become the ideal source for optical radiation to be utilized in an optical fiber transmission system.
Which one is the semiconductor laser?
The material which often used in semiconductor laser is the gallium Arsenide, therefore semiconductor laser is sometimes known as Gallium Arsenide Laser. It is also called Injection Laser.
What is the pumping mechanism of semiconductor laser?
Electrical pumping is used for gas and semiconductor lasers. It is realized by allowing a current (continuous dc current, radio frequency rf current or pulsed current) to flow through a conductive medium, such as an ionized gas or semiconductor.
What material is used in semiconductor laser?
gallium Arsenide
The material which often used in semiconductor laser is the gallium Arsenide, therefore semiconductor laser is sometimes known as Gallium Arsenide Laser. It is also called Injection Laser.
What are the types of semiconductor laser?
GaAs (gallium arsenide)
What semiconductors are used for?
Semiconductors are an essential component of electronic devices, enabling advances in communications, computing, healthcare, military systems, transportation, clean energy, and countless other applications.
What is the principle of laser action?
Principle: Due to stimulated emission the photons multiply in each step-giving rise to an intense beam of photons that are coherent and moving in the same direction. Hence the light is amplified by Stimulated Emission of the Radiation. Termed LASER.
What is output of semiconductor laser?
Semiconductor lasers range in wavelengh from 0.4–1.8 μm with typical continuous output powers of up to 100 mW.
What is the wavelength of semiconductor laser?
Semiconductor lasers are small, very efficient lasers with dimensions of less than a millimeter (see semiconductor gain media). The wavelengths of commercial lasers range from approximately 600 nm in the red to 1.6 μm in the near infrared.
What is the importance of semiconductor?
Importance of Semiconductor Semiconductors are an essential component of electronic devices, enabling advances in communications, computing, healthcare, military systems, transportation, clean energy, and countless other applications.
Why is semiconductor used?
Semiconductors are employed in the manufacture of various kinds of electronic devices, including diodes, transistors, and integrated circuits. Such devices have found wide application because of their compactness, reliability, power efficiency, and low cost.
How do semiconductor lasers work?
Semiconductor Laser Construction and Working Semiconductor Diode Laser Principle Semiconductor lasers are basically PN junction diode. When a p- type semiconductor (has an excess of holes) is in intimate contact with n-type semiconductor (has an excess of the electron), PN junction is formed at the interface.
What is a heterojunction laser?
On the other hand, if the junction is made of different types of semiconductor materials, then the semiconductor laser is known as a heterojunction laser. The population inversion in semiconductor diode (p-n junction diode) is achieved by forward biasing of PN junction diode.
What was the first semiconductor laser?
Robert Hall’s early semiconductor laser patent. This is a detailed technical description of how the first semiconductor lasers worked by creating light inside a diode. US Patent #3,303,432: High power semiconductor laser devices by William E Engeler, Garfinkel Marvin, General Electric.
What are the different excitation methods for semiconductor lasers?
There are three main excitation methods for semiconductor lasers, ie： Most semiconductor lasers are excited by electrical injection, i.e., by applying a forward voltage to the Pn junction to produce excited emission in the junction plane region, i.e., a forward-biased diode.