Life has many harmful harmful radiationinjury with laser in our eyes and health from time to time, showing theconfidence of more and more problems of life for us in our lives and well-beingdeeply affected. The face of a variety of laser protective glasses applicationis very necessary, but there are many types of such equipment, first of all, wemust choose the laser protective glasses must understand the protectiveglasses. Laser protective glasses can be divided into three types ofabsorption, reflection and composite.
1Absorption
The absorption type protective mirror is toabsorb a certain wavelength or a large number of wavelengths of light energy tocomplete the protection, is in glass or polycarbonate plastics to participatein a large number of dyes. The dye can absorb one or more specific wavelengthsof light and allow the light of other wavelengths to pass, so as to achieveeffective protection.
2reflection type
According to the way of reflection,reflective laser protective glasses can be divided into two types ofinterference and diffraction.
(1)the intervention type protective mirror is a multilayer dielectric film whichis coated on the glass substrate, and the laser is selectively reflected by acertain or a certain specific wavelength laser.
The incident laser beam is notperpendicular to the incident plane. When the incident beam deviates from thenormal direction of the filter, by
(2)a range of positive difference becomes small;
(4)obtained by laser wavelength reflection intervention enhanced shorter, so theso-called "blue shift" of [4]. Obviously, when the blue shift isserious, the protective lens will lose its protective effect. In addition,using two or more medium alternate vapor deposition on the glass substratesurface, different dielectric layers respectively according to differentwavelength of laser reflection interference enhancement layer to tens ofhundreds of layers of medium accumulation can make the optical density of laserprotective glasses become large, the wavelength becomes more protective.
(2)diffraction diffraction type protective mirror is composed of dichromatedgelatin or made of photosensitive polymer film holographic optical element,after application to complete reflection of laser diffraction principle andstop protection.
When it was set up, it seemed as if it hada specular reflection on the lens. Theoretically, the reflectivity can reachany value less than 100% [5]. The wavelength of the hologram is two times thatof the hologram interference fringes. Thus, by controlling the distance betweenthe fringes of the hologram, the laser can be reflected by a specificwavelength according to the requirements, and the light of other wavelengthscan be allowed to pass.
3complex
The utility model relates to a compositelaser protective spectacles, which is made by adding one or more dyes into thematrix, and then evaporating the multilayer film. Because of the advantages ofthe absorption type protective mirror and the reflecting protective mirror, thelaser protective performance is improved in a certain level.
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