4mm diameter coated 650-1050nm aspherical lens manufacture custom f2.73mm optical lens

4mm diameter coated 650-1050nm aspherical lens manufacture custom f2.73mm optical lens

Optical Aspherical Lens

custom 4mm diameter aspherical lens

600-1050nm aspherical glass lens

factory offer optical aspheric lens

Ultra-compact high-precision aspherical singlet lens made from N-BK7 or NIR-optimized optical glass, with 4mm clear aperture and 2.73mm effective focal length (f/0.68), designed for visible-to-NIR applications covering 650–1050nm.

The aspheric profile eliminates spherical aberration and provides a smaller, higher-quality focused spot than equivalent spherical lenses—ideal for red/NIR laser diode collimation, VCSEL focusing, and miniature optical modules.

Broadband anti-reflection coating 650–1050nm (Ravg <0.5%) applied on both surfaces. Fully customizable EFL, NA, and coating bands for OEM integration.

Description

4mm diameter coated 650-1050nm aspherical lens manufacture custom 2.73mm focal length optical lens

Specifications:

Lens Type: Optical Glass Aspherical Singlet Lens (Molded / Precision Polished)

Material: N-BK7 (nd=1.5168) / K9 (H-K9L) / N-SF Series / NIR-Grade Glass (Custom)

Diameter (Clear Aperture): 4mm (Ø4mm)

Effective Focal Length (EFL): 2.73mm (Custom 1.5–50mm available)

Back Focal Length (BFL): Specified per design (typically ~2.1–2.6mm)

Numerical Aperture (NA): ~0.68 (approx., depends on beam clearance)

Center Thickness: 0.8mm – 2.5mm (design dependent)

Dimension Tolerance: ±0.02mm

Center Thickness Tolerance: ±0.02mm

Surface Figure (Base Sphere): λ/4 @ 632.8nm

Surface Roughness (RMS): <20nm (Molded) / <5nm (Polished)

Surface Quality (Scratch-Dig): 60-40 / 40-20 / 20-10

Clear Aperture: ≥90% of Ø4mm

Edge Treatment: Ground / Edge Blackened (Optional) / Bevel 0.05–0.1mm × 45°

Aspheric Coefficients: Optimized for 650–1050nm band (available on request)

Coating Options:

Broadband AR 650–1050nm (Ravg<0.5%) ← Standard
V-Coating @ 650nm / 780nm / 850nm / 940nm / 1064nm
Broadband AR 400–700nm / 800–1700nm (Optional)
Uncoated (Available)

Operating Wavelength: 650–1050nm (VIS–NIR)

Transmission: >99% per surface with BBAR coating

Operating Temperature: -40°C to +80°C

We are professional manufacture on the optical lenses &lasers for over 20 years experience.
With the advanteges,we offer optical products in the fileds of University laboratory, Industry, Scientific research,Medical treatment, Mechanical equipments, lasers and Construction industry and so on.

We can provide optical lenses, optical prisms, high-precision Powell prisms, right-angle prisms, laser lenses, filters, aspherical lenses, collimating lenses, optical glass lenses, optical reflectors, cylindrical lenses, laser modules, laser heads, optical glued lenses, optical rod mirrors, etc.

Looking forward to communicating whether we have the opportunity to cooperate. For the lens/laser products you need, I would like to quote our competitive price.

Please contact for any custom needs,
Contact:Rebecca Xu