the key switch to prevent unauthorized use

These lasers have clearly defined as harmful to the eyes, especially when the power is relatively high, will cause eye damage. These lasers must have: the key switch to prevent unauthorized use; laser emission indicator laser is working; turn on the power after 3-5 seconds delay allows the operator to leave the beam path, with emergency stop switch, at any time off the laser beam; the laser must be affixed with a red label and the risk of xx (aperature) label. (250mw laser irradiation a red paper, less than 2 seconds to ignite). Greater than 500 mW output power. These lasers will be able to cause eye damage. Burn skin and ignite clothing just like the laser can ignite other materials. Such laser systems must have: the key switch to prevent unauthorized use; safety device to prevent the work system cover is opened; laser emission indicator laser is working; equipped with emergency stop switch, always turn off the laser beam ; in laser danger labels and posted a good red xx (aperature) label, such laser beam and main beam reflected as very dangerous. (A 1000-watt carbon dioxide laser in a perforated steel plate, set up like what, what happens if the eye). The directivity of laser pointer  is not convenient for using.
Laser with ordinary light sources, because of its high brightness, good direction, the special nature of the energy density will pose a danger. Safe use of lasers requires that all laser users and laser systems in the vicinity of all people must have sufficient knowledge of laser safety knowledge. The most important point was undoubtedly the laser eye safety. In addition to the main light, the laser system in the vicinity there is often a lot of different angles to the divergence of the light. These smooth surfaces such as light in the lens will form a mirror reflection. Although much weaker than the main light, but in terms of the human eye is still very strong, so will still damage the human eye. When the laser intensity is strong enough, it will burn skin or clothing, or even ignite volatile chemicals, such as alcohol, gasoline, ether and other organic solvents, and can damage the light sensor cameras, photodiodes; in the laser beam propagation path, even if Chuanbo some distance, you can still ignite the material; even from the back surface reflection such indirect contact with the laser, it can be dangerous. The user is not satisfied with the use of laser pointer  due to the directivity of laser pointer .