What Is Laser Radiation Protection?

Let's talk about laser radiation, laser is a more special performance of light, it is different from other light is: 1, the direction of the laser is better than ordinary light, which is, why the laser is a point, and another light is a surface; 2, the monochromaticity of the laser is particularly good, that is to say, the blue laser is bluer than the blue LED light, the color is a subjective evaluation of the wavelength of the human eye (different people are likely to produce different color cognition of the same light), and the physical evaluation of the color of the light is evaluated with the "spectrum" parameter, the laser spectrum is purer and narrower than ordinary light. 3, the laser interference is good, this is more inclined to professional physical applications, and the general civilian is not used.

Why protect against laser radiation?

1. because the direction of the laser is good, the divergence is small, so the laser without divergence treatment maintains the concentration of energy over a long distance, and this energy will cause irreversible damage to the eye if it enters the eye.

2. because of the high laser energy, the direct irradiation of continuous laser without divergence treatment on the skin and the surface of dark clothing will lead to a strong thermal effect, resulting in clothing burning and skin scalding.

3. short-wave (ultraviolet) laser, this is not a laser problem, not only ultraviolet laser, as long as it is ultraviolet light, it needs protection, because ultraviolet light is a class of carcinogens identified by WHO.

What situations need to protect against laser radiation and how to protect against laser radiation?

First of all, no matter what the circumstances, can not use the laser to illuminate the eyes of people (whether it is oneself or others) or animals, the intentional use of a laser to illuminate other people's eyes can be identified as intentional injury, will be subject to the corresponding criminal punishment!

1. If exposed to laser (not divergent treatment), the state has relevant standards for laser classification:

Class I (＞ 0.2mW) laser does not need special protection, because its output energy is low, the body's own protection can prevent laser damage to the eyes (no one is silly enough to move the eyes uncomfortable not to avoid it), this laser will not cause damage to the skin, so no special protection is required, this laser is more common in red dot laser pointer.

Class II or above continuous laser must wear the corresponding wavelength of laser protective glasses to protect the eyes, for example, if the laser is 532nm (green light), then you must wear the laser protective glasses that match the wavelength, that is, the protection of 532nm, the protection level depends on the laser output power, Class II, Class III laser output wavelength cutoff rate of OD4 laser protective goggles can achieve the protection effect, but still can not wear glasses to look directly at the laser.

There is also a kind of flat glass used to make laser protective mirror material, called laser protective screen, which has the same effect as laser protective mirror, but the protection area is larger.

Class IV or above (＞500mW) continuous laser is best to wear laser protection goggles with wavelength protection level OD5 or above. Do not wear dark clothing and do not expose your skin to laser light.

2. For high-power (Class IV) lasers, wear a white coat when operating. Do not wear watches, gold and silver jewelry, because watches and gold and silver jewelry may reflect the laser into the eye and cause indirect damage. At the same time, the eyes should not cross the laser output height or walk in the laser output height; At the end of the laser light path, fireproof bricks should be prevented from blocking the continued transmission of the laser.

3. For ultraviolet/infrared lasers, due to their invisibility, you can't look at the light outlet at any time (because you don't know if it is emitting light now). For UV lasers, exposed skin should also wear sunscreen or sunscreen with an MPF value of 50 or above to prevent the increased risk of skin cancer caused by UV light.

The above is the protection of "continuous laser", the pulsed laser has pulsed laser protection measures, but under normal circumstances, people will not be exposed to the pulsed laser, even if exposed to it is also under the operation of professional personnel, such as photon spot removal, photon whitening, these are pulsed laser directly on the skin, this situation can not protect and there is no need for protection. Because the protection will not work, and this situation will not cause harm to the human body. Otherwise, without waiting for you to protect, the Food and Drug Administration of countries around the world will pass, and laser treatment of myopia, which is directly the laser into the eye, but there are professional doctors to operate, so it will not cause irreversible damage to the eyes.

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