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semiconductor laserThe main application of the device

The working principle of a semiconductor laser is the excitation mode. The use of semiconductor materials, that is, the use of electronic transitions between energy bands to emit light, the use of semiconductor crystal cleavage surface to form two parallel mirror as a reflector, the formation of a resonant cavity, so that light oscillation, feedback, radiation amplification to generate light, and output laser.

The advantages of lasers are small size, light weight, reliable operation, low power consumption and high efficiency. Laser packaging technology is mostly developed and evolved on the basis of discrete device packaging technology, but it has great particularity. Typically, the die of the discrete device is encapsulated in a package, and the role of the package is mainly to protect the die and complete the electrical interconnection. The semiconductor laser package is used to output electrical signals, protect the normal operation of the mold, and output visible light. Due to the design and technical requirements of electrical and optical parameters, it is not possible to simply package discrete devices of semiconductor lasers.

semiconductor laserIt is a kind of mature earlier, faster development of laser. Due to their wide wavelength range, simplicity of manufacture, low cost and ease of mass production, as well as due to their small size, light weight and long service life, various semiconductor lasers have developed rapidly and have more than 300 applications. The main application area of semiconductor lasers is Gb LAN. 850nm wavelength semiconductor laser is suitable for Gh LAN,1300nm-1550nm wavelength semiconductor laser is suitable for 10 Gb LAN system. The application of semiconductor lasers covers the entire field of optoelectronics and has become the core technology of optoelectronics. Semiconductor lasers have been widely used in laser ranging, laser radar, laser communication, laser simulation weapons, laser warning, laser guidance and tracking, ignition and detonation, automatic control, testing instruments and other fields, forming a broad market. In 1978, semiconductor lasers began to be used in optical fiber communication systems. Semiconductor lasers can be used as light sources and indicators for optical fiber communications, and optoelectronic systems can be formed by large-scale integrated circuit planar processes. Since semiconductor lasers have excellent characteristics of ultra-miniaturization, high efficiency and high-speed operation, the development of such devices has been closely integrated with optical communication technology from the beginning. It has important applications in optical communication, optical conversion, optical interconnection, parallel lightwave systems, optical information processing and optical storage, optical coupling of optical computer peripherals, etc. The emergence of semiconductor lasers has greatly promoted the development of information optoelectronic technology. So far, it is a relatively fast and important laser fiber communication light source in the field of optical communication. Semiconductor lasers and low-loss optical fibers have had a significant impact on optical fiber communications and accelerated the development of optical fiber communications. Therefore, it can be said that without the advent of semiconductor lasers, there would be no optical communication today. Double heterojunction laser is an important light source for optical fiber communication and atmospheric communication. At present, all long-distance, large-capacity optical information transmission systems use distributed feedbacksemiconductor laser(DFB-LD). Semiconductor lasers are also widely used in optical disc technology, which is a comprehensive technology that integrates computing technology, laser technology and digital communication technology.