Request a quote Toroidal Lenses
Custom toroidal lenses for asymmetric focusing and astigmatism correction.
Product Overview
Toroidal lenses have a toroidal surface with different principal radii in two orthogonal meridians.
They provide different optical action in the two meridians and can be used to tailor asymmetric focusing or compensate astigmatism in a designed optical system.
Principal radii, aperture, thickness, material, surface orientation and coating requirements can be specified for manufacturing review.
Applications
- Laser Diode Beam Conditioning: Tailoring different optical powers in the two principal meridians to reshape an asymmetric beam.
- Anamorphic Imaging Instruments: Producing different image scales in orthogonal directions within a prescribed imaging assembly.
- Optical Inspection & Metrology: Compensating unequal meridional focus positions in a designed astigmatism-correction group.
- Custom Research Instruments: Controlling asymmetric focusing where a spherical lens cannot provide the required two-meridian prescription.
Typical Specifications
| Parameter | Standard Grade | Precision Grade |
|---|---|---|
| Materials | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request |
| Diameter | 5–300 mm | 5–300 mm |
| Diameter Tolerance | +0 / −0.10 mm | +0 / −0.02 mm |
| Center Thickness Tolerance | ±0.10 mm | ±0.02 mm |
| Radius of Curvature Tolerance | ±0.5%–±1% | ±0.1% |
| Surface Figure | λ/4 @ 632.8 nm | λ/10 @ 632.8 nm |
| Surface Quality (Scratch–Dig) | 40–20 | 20–10 / 10–5 |
| Surface Roughness (Ra) | ≤1.0 nm | ≤0.3 nm |
| Centration Error | <3′ | <30″ |
| Angle / Wedge | 1′–5′ | 1″–10″ |
| Coating | AR / HR, etc., to customer requirements | AR / HR, etc., to customer requirements |
Other specifications, materials, and coatings are available upon request.