High-Precision Plano-Concave Lenses from China Suppliers - Factory Made for Optical Systems and Beam Expansion

Core Functions

Beam Control: Negative focal length diverges collimated light for laser beam expansion (divergence 0.5–5°) or aberration compensation.

Focal Length Adjustment: Combined with plano-convex lenses to extend focal length for long-range imaging or projection.

Applications

Laser Processing: Beam divergence control before fiber coupling to reduce energy density.

Optical Imaging: Spherical aberration correction or field curvature compensation in telescopes/microscopes.

Scientific Instruments: Focal length adjustment in interferometers and spectrometers.

Technical Specifications

• Materials: N-BK7 Glass (Visible range 400–700nm); Fused Silica (UV-NIR 190nm–2.1μm, low thermal expansion); Custom Materials (Ge, ZnSe, CaF₂, MgF₂).
• Precision: Surface accuracy λ/4–λ/10 (@632.8nm), diameter tolerance ±0.05mm, center thickness ±0.1mm, clear aperture >90%, scratch/dig 20/10 (upgradable to 10/5).
• Coatings: Single/Multi-layer AR (visible, NIR, or laser wavelengths like 1064nm, 10.6μm); High-LIDT Coatings (>500W).

Customization

• Aspheric concave design: Minimizes spherical aberration for uniform beam divergence.
• Non-standard dimensions: Diameter 1–300mm, radius of curvature 5–1000mm.
• Rapid prototyping: Standard materials in 5 business days, custom materials <3 weeks.

Material Versatility

Compatible with UV, visible, IR, and THz wavelengths for multi-scenario applications.

High-Power Compatibility

Fused silica with hard coatings supports CO₂ lasers (10.6μm) and YAG lasers (1064nm) at high energy levels.