Take the role oflaser protective glasses, the laser is not generally hurt the harm of humanbody, especially the damage to the eyes. Laser directional strong, goodmonochromaticity, coherence is good wait for a characteristic, can make theenergy concentration in space and time, make it in the military, industrial andmedical and other fields have a wide range of applications. Due to eye lens hasfocused on the role of the retina by laser irradiation on unit area energy(power), higher than that of the corresponding amount of corneal incident fornearly 100000 times.
Goodmonochromaticity, laser in the fundus of the color difference is small. Becausepulse laser injuries far more quickly than the blink reflex (eye blink reflextime usually is 150-250 ms, and can short laser pulse to 10-6 s even 10-12s-class). Plus in a very short moment, on a tiny area, the concentration ofenergy released, so that even low doses of cornea or retina caused by laserirradiation can also be serious damage. Damage is cumulative and laser to humaneyes, not obvious at first, after now it is too late. Accident happens, most ofthe injured suddenly feel eyes flash, then there is a different color, differentsizes of light or shadow, individuals a sense of shock, eye at the same time,vision of varying degrees of decline, the person that weigh in a short periodof time can't distinguish between objects in front of him, some hours afterinjury of string and photophobia. Therefore, protection from now on, don'tforget.
Workers in the laseroperation environment for a long time the eye is affected by the long term.During operation and the use of laser, even if not directly by the laserirradiation, cause harm accident. But return by laser ray trace produced byother objects or walls reflection, reasons and lessons in this environment fora long time work:
First, work withouteye protection measures
Second, the lack ofsafe work environment
Three, ideological paralysis
Four, laser triggeredby mistake
Five, in clinicalophthalmology laser treatment, laser protective treatment failed to strictlycontrol the energy to learn that for low power laser (1 mw), you should takeprotective measures, otherwise it will cause eye laser cumulative damage; Forthe laser output power is greater than 1 mw is less than 0.5 w laser, is onlyallowed to look straight beam wear laser protective glasses, or within theblink reflex time about 0.25 s, the output laser can cause the damage of theeye; For laser power 0.5 w, the most harmful to the eyes. Whether direct or bythe excitation light beam reflected light irradiation can cause eye damage.
For this kind oflaser strict protective measures must be taken. No wear laser protectiveglasses never allow such laser operation. The synthetic materials of laserprotective goggles Laser protection has become a research hotspot of manycountries at present. Made of this material nonlinear laser protective gogglesis not only sensitive to wavelengths, and is also sensitive to strong light, itcan achieve the same laser wavelength, the light of high density and hightransparency of weak light the unity of the two indicators and consideration.
According to thereport, carbon - carbon polymer (C60 / C70) with large and extremely fastnonlinear optical effect, but also to realize the saturation under a lowerlight energy absorption material, with optical limiting device made of thismaterial, can make the light transmittance decreases with the increase of theincident light intensity, and to make the output light limit under certainenergy threshold.
This material has ahigh visible light transmittance, more than 60%, but the optical density islower, generally under 3, anti-laser damage threshold is generally low. Itscharacteristic is less when the weak laser incidence absorption, hightransmittance, and strong laser incident, absorption, low transmission. Due tothe nonlinear absorption from the electronic mechanism, therefore, fastresponse, response time for picosecond order of magnitude.
Laser protectiveglasses is a specific wavelength of light absorption by the PC polymermaterials and materials synthesized a kind of efficient explosion-proof safetygoggles. Laser protective glasses using light absorption principle: its noselectivity to light source, safe protection can be all kinds of diffuse light;In light of the incident Angle is not selective, all-round protection onspecific wavelengths of laser and the light. Light reaction quickly. Theattenuation rate is higher.
Surface is not afraidto wear, even with brush strokes, also does not affect the safety of light. Canwear myopia glasses U.S. army materials technology laboratory has been used inthe giant pulse, wide band, ultrafast laser protective goggles, it is in thediamond of polycarbonate or similar performance mixed with conductive polymersand inorganic semiconductor materials, use of its inherent nonlinear effect andcharge exchange principle, implementation of transient laser absorption, thereaction time 10 to 9 seconds, recovery time of 10-8 seconds, protectivewavelength in the visible light range, it can be used to tune the laserprotection and against the shell shock.
The kinds of laserprotective goggles and protective principle Glasses is mainly to prevent laserdamage to the eyes. Because the laser energy concentration, effect is very bigto the harm of eyes, even at the risk of blindness, so workers must wear laserprotective goggles.
Laser protectivegoggles are mainly absorption, reflection, composite, explosive, photochemicalreaction, types of microcrystalline glass type, etc. Absorption is in a glassor plastic lenses to join all kinds of absorbent, absorption of the laser, sothat it is not through. Reflex is plated on the lens on a group of highrefractive index of dielectric film, when the light into dielectric film, allthe reflection phase is the same interface, to reinforce the wavelengths oflight reflection, can reflect laser reach the purpose of protection glasses,and for other visible light has high through the ability.
Compound is composedof two reflecting medium film, separated by a layer of absorption of colorglass, middle inhibition between two reflective film don't need internalreflection. The glasses of laser protective performance is better, safetycoefficient is big, applicable Yu Dazhong power laser protection.
The explosive is onthe lens coated with explosives. When the incident laser intensity reaches acertain value, quickly set off to cover the laser effect, on the military toprevent laser weapon damage eyes. Each laser protective goggles have their owncharacteristics, normally only one wavelength of laser, a few can prevent twoor more wavelengths of the laser, so must be based on the use of laser, choosesuitable laser goggles.
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