🔍 F-Theta Lenses by Yighen

Precision Scan Lenses for Laser Marking, Engraving & Micromachining

📐 What Is an F-Theta Lens?

An F-Theta lens (also known as a scan lens) is a specialized objective lens used with galvanometer scanning systems to direct laser beams across flat fields. Unlike traditional focusing lenses, an F-Theta lens ensures that the scanning field remains linear, so the spot displacement on the work surface is directly proportional to the scan angle.

🔁 In essence:

θ (scan angle) → f·θ (spot position)
Ensuring flat field focus and uniform spot size across the working area.

💡 Yighen F-Theta Lens Features

• 🔬 High-resolution spot quality over wide scan fields

• 🧭 Telecentric & non-telecentric configurations

• ⚡ Supports 10.6 μm CO₂, 532 nm / 1064 nm, and 355 nm UV lasers

• 📏 Field sizes: 50 × 50 mm to 300 × 300 mm

• 🔍 Spot size down to 10 µm, M² ≤1.2 compatible

• 💠 Coatings: V-coat, DLC, or BBAR for laser wavelength

• 🧩 OEM customization: focal length, scan angle, mounting flange

⚙️ Technical Specifications – F-Theta Scan Lenses

🏭 In-House Lens Production

Yighen manufactures F-Theta lenses from optical glass or IR-grade materials in our ISO-certified facility, with:

• 💎 Diamond turning & ultra-precision grinding
    – Ra < 3 nm, P-V < 0.15 µm

• 🔬 AR/DLC coating for high-power lasers

• 🛠️ Opto-mechanical integration for complete lens barrel

• 📏 Interferometric inspection, MTF + beam quality testing

• 🔄 Reverse engineering & performance tuning supported

🧰 Application Areas

📈 Case Study: Telecentric F-Theta Lens for 1064 nm Laser Marker

Client: Southeast Asia laser equipment integrator
Goal: <15 µm spot size across 210 × 210 mm scan field
Solution: Custom F-Theta design, 160 mm focal length, fused silica + DLC
Result: Spot stability ±3.2 µm across field, improved marking uniformity by 27%

🔧 Custom F-Theta Design Services

Need a custom scan lens for special field size, wavelength, or distortion specs?
 

Yighen's optical design team offers:

• 📐 Field linearity optimization (≤1% distortion)

• 🧠 Aberration correction for wide scan angles

• 🛠️ Compact form factor for galvo integration

• 📄 Full 3D modeling, coating curves, test data

🌍 Why Choose Yighen?

Unlike generic suppliers, Yighen brings design + manufacturing + quality control under one roof:

• 🇭🇰 Hong Kong HQ – Optical system design & support

• 🇨🇳 Dongguan Facility – Lens grinding, coating & barrel assembly

• 🇸🇬 Singapore Lab – Freeform metrology & laser optics testing

✅ ISO 9001 / ISO 13485
🎯 Support from prototype to volume manufacturing
🧾 Full inspection report, ZEMAX files & performance data provided

🔍 Precision Scanning with Custom F-Theta Lenses

From laser marking and engraving to 3D printing and wafer inspection, Yighen’s F-Theta lenses deliver high-speed scanning performance with low distortion, uniform spot size, and broadband AR coatings.

📩 Request a Custom F-Theta Design
Tell us your galvo system specs, scan field, wavelength, and resolution needs—we’ll build the optimal solution from substrate to coating.

📘 Download Optical Specs & Drawings
Visit our Downloads page for mechanical dimensions, distortion plots, and field uniformity maps.

🏢 Explore Our Engineering Expertise
Learn how Yighen combines ultra-precision machining and advanced design software on our About page.

🔗 Related Content

• 🖨 Laser Optics
  Optics designed to withstand high-power laser environments with tight LIDT control.

• 🎯 Beam Expanders
  Adjust beam diameter before scanning to optimize resolution and coverage.

• 🧩 Opto-Mechanical Modules
  Custom assemblies for integrating F-Theta lenses into galvo systems or scan heads.

• 🧪 Optical Metrology & Testing
  Comprehensive validation of scan field linearity, spot size, and focal shift.

• 🔬 Optical Engineering Services
  Simulation-driven design of complex scanning systems with tight tolerances.