Use the laser pointer at high altitude

The NOHD of any high powered laser with a level higher than level 1 will be greater than 100 mm, but the laser standard stipulates that NOHD is usually calculated based on an exposure time of 100 seconds, and the exposure time for exposure to a visible laser pointer is deliberately calculated and requires effort. The exposure time may be short, and the eyeballs will move instead of staying still. To show the possibility of accidental injury, we calculated the MPE for 0.1 second exposure, and then used this limit to calculate "0.1 second NOHD". In other words, exposure to the direct beam of the laser for a distance of only 0.1 second may cause eye damage to the retina. Wu Cheng said that it is obvious that the intensity of the laser radiation reflected by the laser beam through the stimulated emission is too high, which will cause photochemical and thermal damage to the body in the developmental stage, especially for children, when the laser pointer is used When the eyes and skin turn blue, it can cause more serious consequences.