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Analyze the status quo and working principle of semiconductors

Categories:Industry News
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Time of issue:2021-03-16 13:48

(Summary description)In recent years, China's laser industry has achieved rapid development. China is an active manufacturing market and a major market for industrial laser equipment.

Analyze the status quo and working principle of semiconductors

(Summary description)In recent years, China's laser industry has achieved rapid development. China is an active manufacturing market and a major market for industrial laser equipment.

Categories:Industry News
Author:
Origin:
Time of issue:2021-03-16 13:48

Information

In recent years, China's laser industry has achieved rapid development. China is an active manufacturing market and a major market for industrial laser equipment. Affected by factors such as macroeconomic development, manufacturing industry upgrading, and national policy support, China's industrial laser industry has become one of the industries that receive high attention.

Semiconductor Changchun lasers are becoming more widely used

As early as the 1980s, semiconductor lasers were only used in optical storage and some niche applications. At that time, optical storage was the first large-scale application in the semiconductor laser industry. With the continuous innovation of semiconductor laser technology, it has promoted the development of optical storage technologies such as digital versatile discs (DVD) and Blu-ray discs (BD). By the 1980s, optical networks became the main battlefield of semiconductor lasers. Later, semiconductor lasers became the key processing and manufacturing equipment for communication networks.

Because semiconductor lasers have the advantages of simple manufacturing, easy mass production, low cost, wide wavelength coverage, small size, long life, low energy consumption, and high electro-optical conversion efficiency, they are used in CD laser disc players, optical fiber communications, optical storage, laser printers, etc. It has been widely used and has gradually covered practical markets in various optoelectronics fields. With the gradual increase in the output power of semiconductor lasers and the continuous improvement of output characteristics, they have gradually begun to play a role in the field of industrial processing. In addition to directly participating in industrial processing, semiconductor lasers are more used as pump sources for fiber lasers and solid-state lasers. They develop together with the industrial laser market and usher in new growth points with the outbreak of fiber lasers.

How semiconductors work

Semiconductor lasers can achieve non-equilibrium carrier transfer between the energy bands of semiconductor materials (conduction band and valence band) or between the energy bands of semiconductor materials and the energy levels of impurities (acceptors or donors) through a certain excitation method. Population inversion, when a large number of electrons and holes in the population inversion state recombine, stimulated emission occurs.

There are three main excitation methods for semiconductor lasers:

1. Electric injection type;

Electrical injection semiconductor lasers are generally semiconductor junction diodes made of GaAS (gallium arsenide), InAS (indium arsenide), Insb (indium antimonide) and other materials, which are excited by injecting current along the forward bias. The junction plane area generates stimulated emission.

2. Electron beam excitation type;

Electron beam-excited semiconductor lasers generally use N-type or P-type semiconductor single crystals (PbS, CdS, ZhO, etc.) as the working material, and are excited by injecting high-energy electron beams from the outside.

3. Optically pumped excitation type;

Optically pumped semiconductor lasers generally use N-type or P-type semiconductor single crystals (GaAS, InAs, InSb, etc.) as the working material, and use laser light from other lasers for optical pump excitation.

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