{"product_id":"cloudray-co2-laser-lens-20mm-fl50-8mm-cvd-znse-meniscus-99-5-transmittance-double-sided-coating","title":"Cloudray CO2 laser lens 20mm FL50.8mm — CVD ZnSe meniscus, ≥99.5% transmittance, double-sided coating","description":"\u003cp\u003e\u003cstrong\u003eCloudray's CO2 laser meniscus lens with a 20mm diameter and 50.8mm focal length is a high-transmittance CVD ZnSe optical component designed for CO2 engraving and cutting systems (40W–200W).\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis precision lens is manufactured from chemical vapor deposited zinc selenide (CVD ZnSe) and finished with a double-sided hard coating to resist wiping and extend service life. It is shaped as a meniscus element to optimize beam convergence for common CO2 laser modules, and its ≥99.5% transmittance helps maintain cutting and engraving performance. Supplied individually, the lens is ready to install in compatible laser heads and mirror-focal setups.\u003c\/p\u003e\n\n\u003ch3\u003eWhat are the exact dimensions and optical specs of this Cloudray lens?\u003c\/h3\u003e\n\u003cp\u003eThe lens measures 20 mm in diameter with a focal length of 50.8 mm and a centre thickness of approximately 2 mm. Its meniscus profile and high transmittance are tuned for mid-infrared CO2 wavelengths used in engraving and cutting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: CVD ZnSe (chemically vapor deposited zinc selenide)\u003c\/li\u003e\n  \u003cli\u003eDiameter: 20 mm (0.79\")\u003c\/li\u003e\n  \u003cli\u003eFocal length: 50.8 mm (2\")\u003c\/li\u003e\n  \u003cli\u003eThickness: ~2 mm (0.07\")\u003c\/li\u003e\n  \u003cli\u003eTransmittance: ≥99.5%\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich laser powers and machines is this lens compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis Cloudray lens is built to tolerate the thermal and optical loads typical of CO2 laser machines in the 40W to 200W range. It works with most CO2 engraver and cutter heads that accept a 20 mm diameter meniscus lens and 50.8 mm focal configuration.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible power rating: 40W–200W\u003c\/li\u003e\n  \u003cli\u003eUse in CO2 engraving and cutting machines\u003c\/li\u003e\n  \u003cli\u003eSuits laser modules designed for 20 mm optics and 50.8 mm focal lengths\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the lens protected and what maintenance is recommended?\u003c\/h3\u003e\n\u003cp\u003eCloudray applies a durable double-sided solid coating that improves wiping resistance and helps the lens withstand routine cleaning. To prolong optical quality, clean only with approved lens tissues and solvent, avoid abrasive wiping, and store in a dust-free case when not installed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCoating: double-sided solid coating for wiping resistance\u003c\/li\u003e\n  \u003cli\u003eCleaning: use lens tissue and appropriate solvent; avoid scratches\u003c\/li\u003e\n  \u003cli\u003eStorage: keep in a protective container, away from dust and humidity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this lens affect beam quality and cutting\/engraving performance?\u003c\/h3\u003e\n\u003cp\u003eWith a meniscus shape and very high transmittance, the lens preserves beam energy while helping to form a focused spot appropriate for cutting and detailed engraving. Its optical finish reduces scattering and absorption losses, supporting consistent processing results when matched to the correct focal distance and laser power.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaintains high energy throughput (≥99.5% transmittance)\u003c\/li\u003e\n  \u003cli\u003eMeniscus profile improves focus control for cutting and fine engraving\u003c\/li\u003e\n  \u003cli\u003eHard coating reduces surface wear that can degrade beam quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Cloudray 20 mm × 50.8 mm CVD ZnSe meniscus lens is intended for technicians, hobbyists, and small-production operators who maintain or upgrade CO2 laser engraving and cutting machines rated roughly 40W–200W. It suits anyone needing a high-transmittance replacement or spare lens that balances durability and optical performance for routine workshop use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this lens compatible with my 60W CO2 laser?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The Cloudray lens supports CO2 systems in the 40W–200W range, so it will work with a 60W unit if the head accepts a 20mm lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How should I clean the Cloudray CVD ZnSe lens?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use lens tissue and a recommended solvent, avoid abrasive cloths, and store in a dust-free container to protect the coating.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Cloudray","offers":[{"title":"Default Title","offer_id":55298169274705,"sku":"B07B8J9PMV","price":57.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/cloudray-front-packaging-lens.jpg?v=1791964560","url":"https:\/\/craftiche.co.uk\/products\/cloudray-co2-laser-lens-20mm-fl50-8mm-cvd-znse-meniscus-99-5-transmittance-double-sided-coating","provider":"Craftiche","version":"1.0","type":"link"}