?(1) The harm and protection of far-infrared laser: The commonly used carbon dioxide laser (10.6μm) is absorbed by the cornea and cannot enter the eye. Since this kind of laser is not visible with infrared lasers and generally has high power, the cornea, conjunctiva and eyelid will be burned if accidentally. For corneal burns, the lightest is a small white cloud point, which appears 10 minutes after irradiation, only involving the corneal epithelium, no puffiness, and then disappears without visible scars. The heavier is the formation of cylindrical white lesions from the outside to the inside Formation of ulceration or perforation. Despite its power, the protection is quite simple, as long as you wear a pair of flat glass glasses. The threshold value of the carbon dioxide laser is 0.1W / cm2. The carbon dioxide laser will absorb the 0.2mm thick skin, which can easily cause blisters or burns. When the power is large, it will burn at once, and physiological reactions (such as pain) will not protect you. Laterally stimulated atmospheric pressure carbon dioxide laser can ionize the air. If 30mJ carbon dioxide is used to illuminate the skin of the forearm surface for 0.5 to 0.25s, and the spot diameter is 10 μm, it will tingle and burn when irradiated. Erythema appeared a few hours later, expanded after 24 hours, edema, and finally scarred. Protective measures Wear work clothes and gloves.
(2) General protective measures: the laser should be possibly enclosed. The laser beam should not leak unless it is close to the target. The laser beam should not be at the same level as the eye. The laser beam should stop at non-reflective and fireproof materials. The pulse laser should have a safety gate to prevent laser explosion. For each application, the lowest radiation level that can achieve the objective should be used.
Take appropriate measures:
(1) The laser emitted by the Class A laser does not cause any biological danger and can be exempted from taking control measures;
(2) Class B laser belongs to the low power range, the wavelength is 0.4 ～ 0.7μm, the power is less than 1mW, long-term fixation may cause retinal damage, so protective measures and warning signs should be used
(3) Class C lasers are in the medium power range, and human exposure to short-term exposure may cause biological damage, so control measures are essential. The laser diffuse reflection beam of this type of laser is not harmful;
(4) D-type lasers are in the high-power range and can produce dangerous laser beams reflecting laser beams. Short-term direct or diffuse exposure of the human body can cause biological damage, and strict control measures must be taken.