Dia50.8mm AR Coating 700-900nm Coated Fused Silica Optical Biconcave Laser Lens. Customized Options: Supports customization from samples, designs, full customization, minor customization, and flexible customization. High Precision Specs: Diameter 50.8mm, Focal length -50mm, Flatness PV<1/8L, Surface quality 20-10, Centerness <3arcmin. AR Coating Performance: Anti-Reflection coating with reflectance Rabs<0.5% at 700-900nm, AOI 0deg. High Laser Damage Threshold: LIDT >2.5J/cm2 under 20ns pulse, 10Hz frequency at 800nm wavelength. Premium Material: Made of high-quality Fused Silica with clear color and >90% clear aperture. Strict Quality Control: 100% visual and function inspection with 30 QA/QC inspectors ensuring MIL-PRF-13830B standard. Versatile Applications: Suitable for lighting, medical, optical, photography, and astronomy fields. Certified Manufacturer: Products certified with RoHS, ISO9001, CE, TUV, and ISO14001 management system.