The types of lasers mainly include ruby ​​lasers, carbon dioxide lasers, excimer Laser pointer, semiconductor lasers, mid-infrared lasers, near-infrared lasers, visible lasers, near-ultraviolet lasers, vacuum ultraviolet lasers, helium-neon lasers, and metal vapor lasers. The function and composition of the laser: It is composed of two parts: the light-emitting center and the matrix crystal. The light-emitting center of most laser crystals is composed of activated ions. The activated ions replace the cations in the matrix crystal to form a doped laser crystal. When the activating ion becomes a part of the matrix crystal composition, it constitutes a self-activated laser crystal.
According to the level set by the EN 60825-1 standard, laser devices (fixed and mobile) are listed according to the potential risks posed by their radiation. There are four of these categories, which are further divided into subcategories (see Table 1). Only lasers below level 2 are harmless (see also hazards and health risks). ).Therefore, it is recommended to use only Class 1 and Class 2 laser pointers, and their maximum power does not exceed 1 mW. Higher power lasers are dangerous and require additional installation and safety measures. The laser 3B class 4.