What is laser focus lens?
Imported focus lens diameter of 20MM. Thickness 3MM, focus lens aka lens, yellow transparent glass lens. The lens is packed in a professional box with foam padding up and down and the lens centered to prevent it from breaking. Focal length 38.1,50.8 (as normal used), 63.5,76,100mm The United States imports CVD zinc selenide Focusing lens product description: Material: ZnSe (zinc selenide) Design wavelength: 10.6μm Focal length tolerance: ± 1% Overall tolerance: + 0.0 / -0.1mm Thickness tolerance: ± 0.1mm Surface type: λ / 2 @ 632.8nm Finishing: 20-10 Eccentricity: <3 ' Effective aperture:> 90% Down side: <0.2 × 45 ° Coating: 10.6um antireflection, 8-14um broadband antireflection Advantages: Hunst laser focus lens all adopt the United States imported CVD zinc selenide, the material absorption rate is low, the production of lenses can withstand high power density, and the surface wear a solid, not easy to fall off, scratc...