F-Theta Lenses

Green Laser F-Theta Lens

Green Laser F-Theta Lens

The Green Laser F-Theta Lens is optimized for 532 nm green laser wavelengths, delivering accurate and stable focus throughout the full scan area. It produces clean edges, consistent line quality, and very low ...

Sold by: Scanner Optics Co., Ltd. Ships from: China
Specifications
Wavelength: 532 nm
Focal Length: 164 mm
Diameter: 96 mm
Clear Aperture: 16 mm
Scan Angle: 25 degrees

Did You Know?

F-Theta lens is a special compound lens designed so that the height of the projected image is directly proportional to the focal length (F) and the angle of incidence on the lens (Theta). Hence, the origin of the name F-Theta lens. It is an integral component in many laser projection systems including galvo scanheads. The use of an F-Theta lens in a laser projection device ensures that the laser beam can be focused and deflected across the projection work area without material distortion in the quality of the focused beam spot. This effectively eliminates the need for complicated compensating optics, electronics and software that would be required with spherical or flat-field scanning lenses. This type of a lens is capable of tightly focusing the laser beam on the focal plane and preserves the focal spot size across the scanning range. This property becomes very useful in laser marking / engraving applications that require high-resolution scanning of the laser beam on a workpiece. When selecting an F-Theta lens you will want to look into a few key parameters including the wavelength tolerance, aperture, diameter, scan field and the laser damage threshold if you will be using it with high power lasers.

Frequently Asked Questions

An F-Theta Lens is a large aperture compound lens built in such a way that the beam deflection distance from the axis on the imaging plane is directly proportional to the focal length (F) and the incidence angle (theta). This is unlike the flat-field scanning lens where that distance would be proportional to the focal length * tan (theta) and unlike the spherical lens that generates curved projection plane.

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