GOST R 59742-2021 Optics and photonics. Lasers and laser-related equipment. Optical elements for laser equipment. Test methods for specular reflectance and regular transmittance
2021GOST R 59742-2021 Optics and photonics. Lasers and laser-related equipment. Optical elements for laser equipment. Test methods for specular reflectance and regular transmittance