F-theta Lenses from Avantier Inc.

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Custom F-Theta Lenses for Precision Laser Scanning

F-Theta lenses are essential optical components in laser scanning, engraving, and cutting systems. At Avantier, we design and manufacture high-performance custom F-Theta lenses tailored to your system requirements—ensuring consistent precision and durability in demanding industrial and scientific environments.

Applications of F-Theta Lenses

F-Theta scan lenses are used wherever flat-field laser focusing and high positional accuracy are required. Common applications include:

Laser marking and engraving systems
Cutting and welding of metals, plastics, and synthetic materials
Micro-drilling and additive manufacturing
Labeling and image transfer systems
Biomedical and life science instruments, including ophthalmic imaging and confocal microscopy

These lenses maintain a constant spot size and linear relationship between scan angle and image position, enabling uniform results across the entire field of view.

Why Choose an F-Theta Lens for Laser Scanning Applications

In a laser scanning system, galvanometer mirrors (scan mirrors) steer the laser beam across the target surface. Using a standard focusing lens would distort the beam profile as it moves off-axis, leading to uneven energy distribution and manufacturing defects.

F-Theta lenses overcome these challenges by ensuring that the position of the focused spot on the image plane is directly proportional to the scan angle (the “θ” in F-Theta). This results in:

Uniform spot size and optical power across the scan field
Flat imaging plane for precise laser processing
Reduced aberrations compared to traditional scanning lenses

Whether for high-speed laser engraving or precision microfabrication, F-Theta lenses provide consistent, distortion-free performance.

Key Design Parameters of F-Theta Lenses

When selecting or customizing an F-Theta lens, consider the following optical parameters:

Operating Wavelength – Must match the laser source (e.g., 355 nm, 532 nm, 1064 nm, or CO? 10.6 µm).
Spot Size – Determines processing resolution and laser intensity.
Scan Field Diameter (SFD) – Defines the usable image area or field coverage.
Output Scan Angle (OSA) – The angular deviation of the beam; ideally zero for telecentric systems.

Avantier’s engineering team can design custom F-Theta lenses optimized for your laser wavelength, field size, and material type, ensuring exceptional accuracy and throughput in your optical system.

Factory Standard

Lens Design	Compact design with 3 to 4 elements
Transmittance	>90%
Distortion (Max.)	<0.25%
Focal Length	Available from 63mm to 635mm
Custom Optical Coating	Working wavelength ranges from UV to visible to infrared
Lens Performance	Customized to fit specific application needs