Premium 101.6mm (4") ZnSe CO2 Laser Focus Lens – 20mm Diameter

This Premium 101.6mm (4-inch) CO2 laser focus lens is designed for cutting and engraving applications where greater depth of focus and additional working clearance are important. Constructed from zinc selenide (ZnSe), the lens is intended for compatible CO2 laser machines operating at a 10.6µm wavelength.

The 4-inch focal length provides increased focusing tolerance compared with shorter lenses, making it particularly useful for thicker materials, recessed workpieces, and applications involving variations in material height. Its longer working distance also provides additional clearance between the lens and workpiece when installed in a compatible optical assembly.

Key Features

• 4-Inch Focal Length: Provides greater depth of focus for cutting applications and materials with varying surface heights.
• Extended Working Distance: Offers additional clearance between the focusing lens and material when used with a compatible focal assembly.
• Zinc Selenide Optics: Infrared optical material used to transmit and focus CO2 laser radiation.
• 20mm Diameter: Designed for compatible focal tube assemblies that accept 20mm lenses.
• Plano-Convex Design: Focuses the incoming laser beam onto the workpiece.
• Thick Material Applications: Suitable for applications where greater focusing tolerance is more important than extremely fine engraving detail.

Technical Specifications

Compatibility

This lens is intended for compatible CO2 laser engraving and cutting machines that accommodate a 20mm diameter focusing lens and support a 101.6mm focal length.

Before ordering, verify your existing lens diameter, focal length, focal tube dimensions, and focusing adjustment range. A longer focal length may require a different focal tube or nozzle arrangement to maintain proper focus and air assist positioning.

Actual cutting performance depends on laser power, material type, thickness, and machine configuration.

Handling & Maintenance

Handle the lens by its edges using appropriate protective gloves. Avoid touching the optical surfaces, and inspect regularly for residue, scratches, or damage. Use only cleaning products and procedures approved for ZnSe laser optics.

Always power down the laser machine before servicing optical components. Do not use damaged or cracked lenses.