The wavelength bands of semiconductor lasers that have been developed and put on the market include 370nm, 390nm, 405nm, 430nm, 480nm, 635nm, 650nm, 670nm, 780nm, 808nm, 850nm, 980nm, 1310nm, 1550nm, etc., among which 1310nm and 1550nm are mainly used for optical fibers. Communication field. 405nm - 670nm is the visible light band, 780nm - 1550nm is the infrared light band, and 390nm - 370nm is the ultraviolet light band.

Lasers are high-intensity light source radiation devices. High-power lasers can be used to cut and weld metal materials. Therefore, lasers can cause serious damage to the human body, especially the human eyes, and special care must be taken when using them. There are unified classifications and unified safety warning signs for lasers internationally. Lasers are divided into four categories (Class 1 ~ Class 4). Class 1 lasers are safe for humans, Class 2 lasers cause minor harm to humans, and Class 3 or above lasers are safe for humans. Lasers can cause serious harm to people, so special attention must be paid when using them to avoid direct exposure to human eyes.