First, the classification of the radiation of the laser is generally divided into four levels.
Introduction to classification:
Low output laser (power less than 0.4mW), no matter what the conditions for the eyes and skin, will not exceed the MPE value, even after focusing through the optical system will not exceed the MPE value. Design security can be guaranteed without special management.
Low-output visible laser (power 0.4mW-1mW), the reaction time for people to close the eyes is 0.25 seconds, and the exposure calculated with this time cannot exceed the MPE value. Usually a laser below 1mW will cause dizziness and can't be considered. It can be said to be completely safe with closed eyes. Do not observe directly in the beam, and do not directly illuminate other people's eyes with Class II laser. Avoid using Yuanyuan equipment to observe Class. II laser.
Medium output laser. If the beam is directly injected into the eye, it will cause damage. For some safety reasons, it is further divided into IIIA and IIIB. Class IIIA is a continuous laser with visible light, and the output is 1-5mW. The energy density of the beam should not exceed 25W/m-m. Avoid using the Yuanwang equipment to observe the IIIA laser, which may increase the danger. Class III B is a continuous laser of 5-500 mW, which is dangerous to observe directly in the beam. However, the minimum irradiation distance is 13 cm, and the maximum irradiation time is less than ten seconds.
High output continuous laser (greater than 500mW), higher than the third level, there is a danger of fire, and diffuse reflection is also dangerous. Laser protection: The laser produces a beam of high intensity and high directivity. If it is directly reflected, reflected or focused on an object, the laser will be partially absorbed, causing the surface or internal temperature of the object to rise, causing local variations or deformations of the material.