At present, the output wavelength of semiconductor laser is from 405 nm to 1500 nm, and the operation mode includes continuous operation and pulse operation. Generally, their names are limited by wavelength and operation mode, such as 630 nm connected semiconductor laser tube, 780 nm pulse semiconductor laser tube, etc.; semiconductor data are also used to directly limit the title, such as: GaAs semiconductor laser tube, arsenic aluminum gallium semiconductor laser tube, etc. Semiconductor laser has the unique advantages of small size, high efficiency, and can directly use the power supply to modulate the output laser. It is suitable for the occasions requiring light equipment and low laser output power. A semiconductor laser unit of the same size and size as a general computer has the same function as a laser tube much larger than its volume. In addition to its low price, the diode laser tube has a much longer life than the ion laser tube due to its high electrical and optical efficiency and long operation life. Due to its wide range of wavelengths from ultraviolet to infrared, it can be transmitted through optical fiber, so the scale of clinical application is becoming wider and wider.
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