F-theta (Fθ) scan lens is an optical component commonly used in laser processing applications such as laser cutting, laser marking, and laser engraving.

It is designed to focus the laser beam onto a fixed point on the surface of the workpiece, regardless of how the laser beam's position changes during the scanning process.

The "F" in the name F-theta represents focal length, while "θ" denotes the scanning angle. The special design of this lens ensures a linear relationship between the focal point position and the scanning position of the incident laser beam. As a result, the lens can maintain the focus of the laser beam on the workpiece surface throughout the scanning process.

The advantages of using an F-theta scan lens include:

1. Uniform focus: F-theta scan lens ensures that the laser beam maintains focus across the entire workpiece surface, resulting in uniform processing effects.

2. Precise pattern control: By adjusting the design parameters of the scan lens, the size and shape of the laser beam pattern formed on the workpiece can be precisely controlled.

3. High-speed scanning: Due to the special design of the F-theta scan lens, it can maintain a stable focus position during high-speed scanning, enabling efficient laser processing.

F-theta scan lens is typically used in conjunction with scanning mirrors (such as Galvanometer mirrors) to achieve precise control and processing of the laser beam. This combination is widely utilized in the field of laser processing, including laser cutting, laser marking, and laser engraving, among others.