When choosing laser protective glasses, we need to refer to the following points:
1. According to the above-mentioned laser safety standards, determine whether you need to wear laser protective goggles. However, if it is not safe to look directly at the laser and its diffuse reflection laser, you must use laser protective goggles.
2. The characteristics of the laser: the output wavelength and power density of the laser. Common laser wavelengths are 1064nm, 10600nm, 355nm, 808nm and so on. Laser protective goggles generally provide protection in a certain wavelength band, and different wavelength combinations should be equipped with different laser protective goggles.
3. Protection level: Laser protective goggles are roughly divided into two categories: imported and domestic. According to the certification, it can be divided into CE certified and non-certified products, and can be divided into OD1+ to OD7+ according to the protection level. For most applications, we recommend the use of CE-certified products, and it is recommended to choose products with the highest degree of protection OD7+.
4. Optical density (OD): The larger the OD value, the stronger the protective ability of the laser goggles.
5. Visible light transmittance (VLT): The laser protective goggles have a good protective effect on the laser, but at the same time it will also block part of the visible light. The VLT value is less than 20%, and laser protective glasses need to be used in a well-lit environment.
6. The maximum irradiance Hmax (J/m2) or the maximum irradiance Emax (W/m2).
7. Spectacle frame: Whether to wear myopia glasses and facial contour.
8. The non-uniformity, asymmetry, incident light angle effect of the protective lens, etc.
9. Ability to resist laser radiation.
10. Visible light transmittance.
11. Structure and appearance.
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