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What is a laser diode?

发表于2020-01-06


  1. A Laser Diode is an acronym for "Laser amplification based on stimulated emission of light through stimulated emission (optical amplification)." a Laser Diode is also known as a semiconductor Laser, often referred to as an LD.


    Because it can produce light of exactly the same wavelength and phase, it is highly coherent.


    The light generated by the injection current is amplified back and forth between the two lenses until the laser oscillates. In short, a laser diode is an LED that amplifies light through a mirror.


    The difference between a laser diode and an LED


    Because the spectrum width of laser diode is narrow and the wavelength is single, the phase is neat and the direction is high.


    Laser diodes make full use of their coherence properties, such as direct progressive, small spot size (um ~), monochromatism, high optical density and coherence, and have been widely used in a variety of applications.


    More recently, motion sensors, hard disk assisted magnetic recording and lighting (projectors, headlights) have also been used.


    function


    (1) read micro point can be used to read WeChat ID CD (CD, DVD, BD), etc


    (2) record the color or crystal phase transition of the organic film into the signal CD (CD, DVD, BD) with high power


    (3) photosensitive drum can draw signal laser printer, MFP, etc


    (4) the communication supports high-speed modulation, which can transmit a large amount of information, such as PC and mobile phone optical communication


    (5) lighting of small point light source, accurate positioning of laser microscope, positioning of beacon, laying out, etc


    6. The measured distance attenuation is small, and the light can reach the distance of the road, the distance of the vehicle, the height of the building and so on


    The sensor easily forms interference fringe, which can catch small changes of smoke sensor, dust management, laser mouse sensing function