Development of laser protective glasses
The relevant data of laser laserprotective glasses since twentieth Century is the biggest color of humaninventions, we on the laser protective glasses are not so understanding, it isa kind of let us feel very good glasses, it can make our eyes get better help,let us know it no harm to our eyes, in the eye the strong scattering light inthe environment of long-term exposure, will cause the vitreous body andultimately affect vision, for those are often exposed to laser backgroundperformance and laser direct contact with the staff, take the necessaryprotection and laser protection.
Laser protective eyewear is based on thisbackground. The traditional laser protective glasses, seen people may feel itis not strange, it is basically the same principle we called sunglasses, whichallows certain wavelength (or color) of the light entering the eye, the otherwavelength (or color) light, especially by laser harmful lens self absorption andfilter, thus to protect the eye. For example, a common wavelength (nm) 532nmgreen laser to the surface of the object, because the human eye is moresensitive to the laser so as long as there is brightness, we will feeldazzling, eyes will feel dry for a long time.
If we put on a red lens glasses, scatteredto the eyes of the green laser will be greatly attenuated, the eyes will feel alot of soft. If the quality of the protective mirror, green light can bereduced to the lens of the eye can hardly feel the extent of. For example, forwavelengths below 300nm ultraviolet laser or infrared laser wavelength of 5um,we just wear an ordinary glasses, laser scattering basically can not enter theeyes, this is because the optical medium for ultraviolet and infrared laser absorptionis great.
Laser mirror for a specific wavelengthattenuation is OD (Optical Density optical density) to characterize theparameters, the greater the value, shows that the attenuation of the laser isstronger, but even higher, can not be 100 percent decay, therefore, when thereis a strong scattering laser, or there will be a part of the laser through theprotective lens into the eye.
In some cases, even adifferent color (wavelength) laser exist at the same time, although the doormirror using a neutral attenuator to different wavelength and attenuation, butthe attenuation can only be controlled in a certain range, if the decay is toolarge, it may not see other objects except the thought of laser. Therefore, thetraditional laser protective goggles on the human eye protection and capacityis limited.
The defect of traditional laser protectiveglasses is that the laser can not be separated from the human eye, so theprotective effect is very limited. If we can achieve a laser and the human eyeseparated from the laser protective tools, not only will completely exclude thepossibility of laser damage to the human eye, but also can be easily andeffectively carried out research and production of laser applications. Now, imaging,photoelectric detection, digital signal processing and electro-optical displaytechnology, has been developed to a hitherto unknown level, therefore thedevelopment of such a lightweight and low price, and the new concept of laserprotective glasses and laser eye really isolate has become possible.
This paper introduces the design concept oflaser protective glasses, and traditional laser protective goggles is almost entirelydifferent so true human isolation and laser, the eye can play a protective rolevery safe, especially for people with digital function provides a greatconvenience.
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