Laser protective glasses have differentkinds of laser protective glasses, different materials, different principlesand different applications. Therefore, to provide laser effective protection,the laser protection glasses must be made reasonable according to the specificuse requirement. Choosing goggles, first of all, according to the maximumoutput power of the laser used (or energy), beam diameter, pulse time determineparameters such as laser output maximum irradiance or maximum exposure. Then,according to the corresponding wavelength and irradiation time of the maximumallowable exposure exposure limit (eye) determine minimum optical density valuefor the glasses, and on the basis of selecting appropriate laser protectiveglasses.
The specific conditions of choice are:
Maximum irradiation dose of Hmax (J/m2) ormaximum irradiance Emax (W/m2);
Specific protective wavelengths;
Minimum optical density value of Dmin atthe corresponding protection wavelength;
The non-uniformity, asymmetry and Angleeffect of the protective lens, etc.
The ability to resist laser radiation;
6, visible light transmittance;
Structure and shape. As the lasertechnology is widely used in the field of military, civilian, laser protectiontechnology more and more get people's attention, the kinds of laser protectivematerials are increasing. From the principle of protection, laser protectionmaterial can be divided into absorbing, reflective and absorbing/reflectingcomplex. Absorption, reflection-type laser protective eyewear, and reflectivelaser goggles are coated with multiple layers of reflective media on the baseoptical glass surface.
Advantages:
The process is simple;
High visible light.
Higher attenuation rates;
The light response time is 10 to 9 seconds.
Disadvantages:
There is a serious selection of lightsources.
The incoming light source must be oppositethe protective mirror (which is in the direction of mirror normal), and itsprotective effect is greatest. Otherwise, there will be blue drift, and thelarger the incident Angle, the shorter the protective wavelength. When theprotective band is not wide enough or the protection wavelength is slightlyshorter, it may be completely invalidated.
It is also the most dangerous when thereflective layer is easily removed and is not visible to the naked eye aftershedding.
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