An F-theta lens is a precision laser scanning lens designed to ensure a linear relationship between scan angle and spot position on the working plane. Unlike standard focusing lenses, an F-theta lens maintains a flat field and constant spot positioning, which is critical for high-speed galvanometer scanning systems.
Shape Optics provides high-precision F-theta lenses optimized for laser marking, laser welding, laser cleaning, and micromachining. These lenses deliver uniform spot size, minimal distortion, high transmission, and excellent damage resistance, ensuring stable and repeatable processing results across the entire scan field.
Functions of an F-Theta Lens
F-theta lenses play a critical role in laser processing systems by:
- Maintaining linear scan accuracy across the working area
- Producing a flat focal plane for consistent processing depth
- Minimizing spot distortion and field curvature
- Supporting high-speed galvanometer scanning
- Enabling large-area laser processing with uniform energy distribution
Applications
- Laser Marking & Engraving
- Laser Precision Welding
- Laser Cleaning & Surface Treatment
- Laser Cutting & Micromachining
- Additive Manufacturing & Industrial Laser Processing
Key Benefits
- High Laser Damage Threshold – suitable for high-power laser systems
- High Optical Transmission – improved energy efficiency
- Wide Scanning Range – supports large working fields
- Excellent Spot Uniformity – consistent processing quality
- Low Distortion & High Accuracy – ideal for precision applications
Product Specifications & Options
Shape Optics F-theta lenses are available for CO₂, fiber, green, and UV laser wavelengths, using optimized materials and coatings.
CO₂ Laser (10.6 μm) – ZnSe
| Focal Length | Scan Area | Material | Max Input Spot | Max AOI |
|---|---|---|---|---|
| 100 mm | 70 × 70 mm | ZnSe | Φ10 mm | 28° |
| 200 mm | 140 × 140 mm | ZnSe | Φ15 mm | 28° |
| 300 mm | 210 × 210 mm | ZnSe | Φ12 mm | 28° |
| 420 mm | 300 × 300 mm | ZnSe | Φ20 mm | 28° |
| 574 mm | 400 × 400 mm | ZnSe | Φ20 mm | 28° |
| 720 mm | 500 × 500 mm | ZnSe | Φ20 mm | 28° |
Fiber Laser (1064 nm) – Optical Glass
| Focal Length | Scan Area | Material | Max Input Spot | Max AOI |
|---|---|---|---|---|
| 160 mm | 110 × 110 mm | Optical Glass | Φ12 mm | 28° |
| 290 mm | 205 × 205 mm | Optical Glass | Φ14 mm | 25° |
| 420 mm | 300 × 300 mm | Optical Glass | Φ15 mm | 25° |
Green & UV Laser – Optical Glass
| Wavelength | Focal Length | Scan Area | Max Input Spot | Max AOI |
|---|---|---|---|---|
| 532 nm | 100 mm | 60 × 60 mm | Φ14 mm | 20° |
| 532 nm | 254 mm | 150 × 150 mm | Φ10 mm | 25° |
| 355 nm | 160 mm | 110 × 110 mm | Φ6 mm | 28° |
Customization Capabilities
- Custom focal length and scan field
- Wavelength-specific AR coatings
- High-power and ultra-short pulse compatibility
- Custom mechanical interfaces and mounts
- Design optimization for specific galvo systems