What is working principle of semiconductor laser?
When a p-n junction diode is forward biased, the electrons from n – region and the holes from the p- region cross the junction and recombine with each other. During the recombination process, the light radiation (photons) is released from a certain specified direct band gap semiconductors like Ga-As.
Which semiconductor can be used for laser production?
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. The semiconductor is made in unique manner for the semiconductor laser.
What is laser semiconductor?
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 materials are used in semiconductor laser?
Such lasers consist of two basic components, an optical amplifier and a resonator. The amplifier is made from a direct-bandgap semiconductor material based on either gallium arsenide (GaAs) or InP substrates. These are compounds based on the Group III and Group V elements in the periodic table.
What is the characteristics of semiconductor 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 advantages of semiconductor laser explain in brief the working of it?
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.
What is semiconductor laser and its types?
Types of Semiconductor Lasers External cavity diode lasers contain a laser diode as the gain medium of a longer laser cavity. They are often wavelength-tunable and exhibit a small emission linewidth. Both monolithic and external-cavity low-power levels can also be mode-locked for ultrashort pulse generation.
What are the applications of semiconductor lasers?
Such characteristics make semiconductor lasers the most important type of lasers, technologically speaking. Their applications are extremely widespread and include optical telecommunications, optical data storage, metrology, spectroscopy, material processing, pumping of other lasers, and medical treatments.
How are semiconductor lasers made?
Semiconductor lasers are solid-state lasers based on semiconductor gain media, where optical amplification is usually achieved by stimulated emission at an interband transition under conditions of a high carrier density in the conduction band.
What are the advantages and disadvantages of semiconductor laser?
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