Cloudray CO2 laser focus lens 20mm FL38.1mm CVD ZnSe — 40–200W, meniscus high-transmittance double-coated optic

Cloudray's 20mm CVD ZnSe CO2 laser focus lens (FL 38.1mm) is a high-transmittance, meniscus-shaped optic engineered to deliver precise focal performance for 40W–200W CO2 engraving and cutting machines.

This precision lens is made from CVD-grown zinc selenide and finished with a durable double-sided solid coating for long service life and easy cleaning. With a 20mm diameter and a 38.1mm focal length, it balances tight focus and working distance for common CO2 laser systems. The lens's ≥99.5% transmittance and wiping-resistant coating reduce energy loss and maintenance downtime, making it a reliable replacement or upgrade part for hobbyist and production setups.

How does this lens affect engraving and cutting accuracy?

The meniscus design and exact 38.1mm focal length concentrate the beam to produce a smaller, consistent spot size, which improves edge definition and detail on engraving jobs. That tighter focus also allows cleaner through-cuts at appropriate power levels, especially on thin materials.

• 20mm diameter for compact beam shaping
• 38.1mm focal length for precise spot control
• Meniscus profile reduces spherical aberration
• High transmittance minimizes power loss

Will this lens fit my CO2 laser cutter or engraver?

This Cloudray lens is compatible with most CO2 laser systems that accept a 20mm diameter focus optic and operate within the 40W–200W power range. Verify mechanical holder dimensions and focal spacing in your machine manual before installation to ensure proper alignment and safe operation.

• Diameter: 20mm (0.71") — check holder bore size
• Focal length: 38.1mm (1.5") — adjust z-axis to match
• Power rating: suitable for 40W–200W CO2 lasers
• Standard meniscus shape fits common focussing assemblies

How durable is the lens and how do I maintain it?

Cloudray applies a double-sided solid coating to the ZnSe substrate to enhance surface hardness and resist wiping damage. Proper cleaning with recommended solvents and lint-free wipes prevents coating wear and preserves the lens's high transmittance over time.

• Coating: double-sided, wiping-resistant
• Material: CVD ZnSe for stable optical properties
• Thickness: 2mm — robust but lightweight
• Cleaning: use lens-safe alcohol and soft lint-free cloths

What performance can I expect across different materials?

With high transmittance and precise focal geometry, the lens delivers repeatable results across engraving and cutting tasks on wood, acrylic, leather, paper, and some thin metals at appropriate settings. Optimal speed and power will vary by material thickness and machine power; always run test cuts to dial in parameters.

• Excellent for detailed engraving on wood and acrylic
• Clean cutting on thin plastics and fabrics with correct settings
• Improved detail reproduction at lower power for delicate work
• Test on scrap material to optimize settings for each job

Who is this for: The Cloudray 20mm FL38.1mm CO2 focus lens is aimed at makers, small-product manufacturers, and laser hobbyists who need a reliable, high-transmittance replacement or upgrade optic for 40W–200W CO2 engraving and cutting systems. It suits users who value stable focus, easy maintenance, and consistent results for detailed engraving or moderate cutting tasks. Make sure your machine accepts a 20mm lens and that you follow safety and alignment procedures during installation.