6.325mm diameter 1550nm optical glass aspherical lens 4.5mm focal length optical lens customized

6.325mm diameter 1550nm optical glass aspherical lens 4.5mm focal length optical lens customized

Optical Aspherical Lens

custom 6.325mm diameter aspherical lens

1550nm aspherical glass lens

factory offer optical aspheric lens

High-precision customized optical glass aspherical singlet lens with 6.325mm clear aperture and 4.5mm effective focal length, specifically designed for 1550nm near-infrared applications such as fiber optic collimation, LiDAR receiver optics, free-space optical communications, and IR sensor focusing.

The aspheric profile eliminates spherical aberration and delivers a diffraction-limited spot with high coupling efficiency.

Anti-reflection coated at 1550nm (V-coat or BBAR 1260–1620nm optional). Molded or polished from low-absorption NIR-grade glass. Ideal for compact telecom/datacom modules, coherent LiDAR, and OEM photonics assemblies.

Description

6.325mm diameter 1550nm aspherical lens manufacture custom4.5mm focal length optical lens

Specifications:

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

Material: N-BK7 (for visible ref.), N-SF6 / N-SF11 / IG Series / NIR-Grade Low-OH⁻ Glass (Optimized for 1550nm) / Custom

Diameter (Clear Aperture): 6.325mm (Ø6.325mm) / Custom 1–50mm

Effective Focal Length (EFL): 4.5mm (Custom 2–100mm available)

Back Focal Length (BFL): Specified per design (typically ~3.5–4.2mm for EFL=4.5mm)

Numerical Aperture (NA): ~0.55–0.65 (depends on beam clearance)

Center Thickness: 1.0mm – 3.0mm (design dependent, 4.5mm EFL typical ~1.8mm)

Dimension Tolerance: ±0.02mm

Center Thickness Tolerance: ±0.02mm

Surface Figure (Base Sphere): λ/4 @ 632.8nm (Measured pre-aspheric)

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

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

Clear Aperture: ≥90% of Ø6.325mm

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

Aspheric Coefficients: Optimized for 1550nm NIR band (available on request)

Coating Options:

V-Coating @ 1550nm (R<0.25% per surface)
Broadband AR 1260–1620nm / 1300–1600nm (Ravg<0.5%)
Dual-Wavelength AR 1310/1550nm (Optional)
Uncoated (Available)

Operating Wavelength: Optimized for 1550nm (Telecom / LiDAR / Sensing)

Transmission: >99% per surface with V-Coat / BBAR

Operating Temperature: -40°C to +85°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