Cloudray CO2 laser lens 20mm FL50.8mm — CVD ZnSe meniscus, ≥99.5% transmittance, double-sided coating

Cloudray'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).

This 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.

What are the exact dimensions and optical specs of this Cloudray lens?

The 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.

• Material: CVD ZnSe (chemically vapor deposited zinc selenide)
• Diameter: 20 mm (0.79")
• Focal length: 50.8 mm (2")
• Thickness: ~2 mm (0.07")
• Transmittance: ≥99.5%

Which laser powers and machines is this lens compatible with?

This 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.

• Compatible power rating: 40W–200W
• Use in CO2 engraving and cutting machines
• Suits laser modules designed for 20 mm optics and 50.8 mm focal lengths

How is the lens protected and what maintenance is recommended?

Cloudray 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.

• Coating: double-sided solid coating for wiping resistance
• Cleaning: use lens tissue and appropriate solvent; avoid scratches
• Storage: keep in a protective container, away from dust and humidity

How does this lens affect beam quality and cutting/engraving performance?

With 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.

• Maintains high energy throughput (≥99.5% transmittance)
• Meniscus profile improves focus control for cutting and fine engraving
• Hard coating reduces surface wear that can degrade beam quality

Who 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.