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Several characteristics of laser protective glasses

Life has many harmful harmful radiation injury with laser in our eyes and health from time to time, showing the confidence of more and more problems of life for us in our lives and well-being deeply affected. The face of a variety of laser protective glasses application is very necessary, but there are many types of such equipment, first of all, we must choose the laser protective glasses must understand the protective glasses. Laser protective glasses can be divided into three types of absorption, reflection and composite.
1 Absorption
The absorption type protective mirror is to absorb a certain wavelength or a large number of wavelengths of light energy to complete the protection, is in glass or polycarbonate plastics to participate in a large number of dyes. The dye can absorb one or more specific wavelengths of light and allow the light of other wavelengths to pass, so as to achieve effective protection.
2 reflection type
According to the way of reflection, reflective laser protective glasses can be divided into two types of interference and diffraction.
(1) the intervention type protective mirror is a multilayer dielectric film which is coated on the glass substrate, and the laser is selectively reflected by a certain or a certain specific wavelength laser.
The incident laser beam is not perpendicular to the incident plane. When the incident beam deviates from the normal direction of the filter, by (2) a range of positive difference becomes small; (4) obtained by laser wavelength reflection intervention enhanced shorter, so the so-called "blue shift" of [4]. Obviously, when the blue shift is serious, the protective lens will lose its protective effect. In addition, using two or more medium alternate vapor deposition on the glass substrate surface, different dielectric layers respectively according to different wavelength of laser reflection interference enhancement layer to tens of hundreds of layers of medium accumulation can make the optical density of laser protective glasses become large, the wavelength becomes more protective.
(2) diffraction diffraction type protective mirror is composed of dichromated gelatin or made of photosensitive polymer film holographic optical element, after application to complete reflection of laser diffraction principle and stop protection.
When it was set up, it seemed as if it had a specular reflection on the lens. Theoretically, the reflectivity can reach any value less than 100% [5]. The wavelength of the hologram is two times that of the hologram interference fringes. Thus, by controlling the distance between the fringes of the hologram, the laser can be reflected by a specific wavelength according to the requirements, and the light of other wavelengths can be allowed to pass.
3 complex
The utility model relates to a composite laser protective spectacles, which is made by adding one or more dyes into the matrix, and then evaporating the multilayer film. Because of the advantages of the absorption type protective mirror and the reflecting protective mirror, the laser protective performance is improved in a certain level.
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