1064nm F-Theta scan lens (also known as a flat-field scan lens) is a critical optical component designed for infrared fiber laser and Nd:YAG laser marking, engraving, and cutting systems. Its key design feature is the linear relationship between output beam displacement and scan angle (displacement = f × θ), enabling galvo scanners to operate at constant angular velocity and greatly simplifying control electronics.

Optical Performance

These lenses feature an air-spaced multi-element construction optimized for the 1064nm wavelength, delivering diffraction-limited performance across the entire field with low wavefront error and low F-Theta distortion (<0.1%). Standard transmission is ≥95%, with high-performance AR coatings ensuring excellent beam transmission efficiency.

Product Specifications

Focal lengths range from 100mm to 273mm, with scan fields up to 164mm × 164mm. Depending on focal length specifications, focused spot sizes range from 17μm to 26μm, with maximum working distances up to 188mm. The standard mounting interface is M85×1.0 thread, compatible with mainstream commercial galvo systems. A replaceable protective window is provided at the front of the lens assembly for easy maintenance.

Typical Applications

These lenses are widely used in industrial processing scenarios including laser marking, engraving, metal cutting and drilling, and 3D modeling, serving as core optical components for high-precision, high-efficiency scanning applications.