Lasers are divided into 4 classes according to power
The safety level of the laser is classified according to the degree of damage to the human body caused by the laser produced by the laser. LASERS ARE CLASSIFIED FROM CLASS I (NON-DAMAGING) TO CLASS IV LASERS.
Class <Class I> lasers are low-energy laser machines that are very safe and avoid all electrostatic hazards and are free of biological hazards. Here are just a few of the applications of CLASS I lasers: laser printers, CD players, CD ROM equipment, geological survey equipment, and experimental analysis equipment. CLASS I LASERS DO NOT CAUSE DAMAGE TO THE HUMAN BODY OR SKIN UNDER ANY CONDITIONS. When using a CLASS I laser, no additional safety equipment is required.
CLASS <CLASS II> LASERS ARE ALSO LOW-ENERGY LASERS (< 1 MILLIWATT POWER), BUT THEY CAN DAMAGE THE HUMAN EYE. Some examples of applications for Class II lasers include laser pointers, sighting devices, and some distance measurement devices. AVOID LOOKING DIRECTLY AT THE CLASS II LASER, AND ALSO DO NOT AIM THE CLASS II LASER AT ANYONE'S EYES. IN ADDITION, YOU SHOULD AVOID LOOKING AT CLASS II LASERS WITH TELESCOPES. IN FACT, IF A CLASS II LASER IS SHINING INTO YOUR EYES, YOU SHOULD IMMEDIATELY TURN YOUR HEAD TO THE SIDE OR CLOSE YOUR EYES IMMEDIATELY TO PREVENT LASER DAMAGE.
CLASS A LASER <CLASS IIIA> IS A STRONG LASER, WHICH IS A CONTINUOUS LASER WAVE, WHICH BELONGS TO A MEDIUM-ENERGY EMITTING DEVICE, AND THE SCATTERING OF LIGHT IS HARMFUL TO THE HUMAN BODY. Products equipped with Class IIIA lasers are located at an open area of 1000 m (3300 ft). Different countries have different regulations on the use of laser products, and at present, many foreign countries do not allow tertiary laser products to be used in cities, and diffuse scattering blocking materials are used to block the laser beam from passing through the restricted area (harmful distance*), and the laser beam must be stopped when people are active. Generally, it refers to the power of 1-5mW
CLASS CLASS LASER <CLASS IIIB> LASERS ARE MEDIUM-POWER LASERS. Not only is direct vision prohibited, but the scattered laser light can also cause damage to the human body. Whenever you operate in the laser control area, you must wear an isolation suit and a special protective eye shield. It is forbidden to use it in areas where there is human activity. Generally, it refers to the power of 5-500mW
Class IV > lasers are high-power lasers < class. The following are examples of the use of Class IV lasers, cutting, welding, and fiber machining. Class IV lasers are very dangerous and can cause fires. Generally, it refers to the power > 500mW