High-Precision Plano-Concave Lenses from China Suppliers and Factory for Optical Systems and Laser Applications

Beam Control: Negative focal length diverges collimated light for laser beam expansion (divergence 0.5–5°) or aberration compensation1.

Focal Length Adjustment: Combined with plano-convex lenses to extend focal length for long-range imaging or projection2.

Materials:
N-BK7 Glass: High transmission in visible range (400–700nm), cost-effective;
Fused Silica: Broadband UV-NIR (190nm–2.1μm), low thermal expansion, laser damage-resistant.
Custom Materials: Infrared substrates (Ge, ZnSe), fluorides (CaF₂, MgF₂), etc.

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: Covers visible, NIR, or laser wavelengths (e.g., 1064nm, 10.6μm);
High-LIDT Coatings: Compatible with high-power lasers (>500W).

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.

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