What Is an f-theta Lens?

An F-theta lens is a special Scan Lens used in laser marking, engraving, welding, cutting, and cleaning systems.
It is designed to keep the laser spot focused evenly across the entire scan field.

Typical applications include:

• Fiber laser marking

• UV laser processing

• CO2 laser engraving

• PCB laser cutting

• Industrial laser automation

What Is a Fused Silica F-Theta Lens?

A fused silica F-theta lens is typically used for:

• Fiber lasers

• UV lasers

• Green lasers

Fused silica offers:

• High laser damage threshold

• Excellent thermal stability

• Low absorption

• High precision optical performance

Common wavelengths:

• 1064nm

• 1030nm

• 355nm

• 532nm

What Is a ZnSe F-Theta Lens?

ZnSe (Zinc Selenide) F-Theta Lenses are mainly designed for CO2 laser systems.

ZnSe provides:

• Very high transmission at 10.6μm

• Excellent infrared performance

• Low absorption for CO2 lasers

Typical applications:

• CO2 laser engraving

• Textile cutting

• Acrylic cutting

• Wood engraving

• Non-metal material processing

Common wavelength:

• 10.6μm

Fused Silica vs ZnSe F-Theta Lens

Which F-Theta Lens Should You Choose?

Choose Fused Silica F-Theta Lens If:

You are using:

• Fiber laser marking machine

• UV laser system

• Green laser system

• High precision laser processing

You need:

• High stability

• Better beam quality

• Long lifetime

• High power resistance

Typical industries:

• Electronics

• PCB manufacturing

• Medical devices

• Precision metal marking

Choose ZnSe F-Theta Lens If:

You are using:

• CO2 laser engraving machine

• CO2 cutting system

You process:

• Acrylic

• Wood

• Leather

• Fabric

• Plastic

ZnSe lenses are optimized for infrared CO2 laser wavelengths and provide excellent transmission at 10.6μm.

Important Factors When Selecting an F-Theta Lens

Before choosing a scan lens, consider:

Laser Wavelength

Different wavelengths require different optical materials.

Scan Field Size

Examples:

• 110x110mm

• 160x160mm

• 200x200mm

• 300x300mm

Focal Length

Common focal lengths:

• 163mm

• 210mm

• 254mm

• 330mm

Thread Type

Typical thread standards:

• M85

• M95

• M102

Coating

High-quality AR coating improves transmission and reduces reflection loss.

Why High-Quality F-Theta Lenses Matter

A high precision F-theta lens can provide:

• Smaller laser spot size

• Better marking quality

• Lower distortion

• Higher scanning accuracy

• Longer service life

For industrial laser systems, optical quality directly affects production efficiency and final product quality.

Looking for a Reliable F-Theta Lens Supplier?

We provide:

• Fiber laser F-theta lenses

• UV F-theta lenses

• CO2 ZnSe F-theta lenses

• Telecentric scan lenses

• Custom scan field solutions

Available scan areas:

• 70x70mm

• 110x110mm

• 160x160mm

• 200x200mm

• 300x300mm

Custom wavelength, coating, and thread options are available.

Contact us for technical support and quotation.