Best-Form Lens, N-BK7, Uncoated: 350-2000 nm OLB240140
Best-form lenses minimize spherical aberration while retaining spherical surfaces. Front and rear curvature combinations determine focal length and different aberrations. Optimizing both radii gives diffraction-limited spots at infinite conjugates for focusing or collimation. For best focusing, the smaller-radius, more curved face should face the collimated source. This JCOPTIX lens uses N-BK7 glass. N-BK7 is the common borosilicate crown glass with excellent performance at moderate cost. N-BK7 provides high homogeneity, few bubbles, low impurities, and easy manufacture for visible and NIR optics. N-BK7 often replaces UV fused silica when high UV transmission and lower expansion are unnecessary. JCOPTIX offers diameter 25.4 mm, uncoated for broad bandwidth and high damage threshold or AR-coated on both sides for 350-700 nm, 650-1100 nm, or 1050-1700 nm. Average reflection below 0.5% per surface improves transmission. Plano-convex lenses of any diameter and focal length can be improved to best-form versions. Contact technical support for customization.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | N-BK7 |
| Diameter | 25.4 mm |
| Clear Aperture Dimension | ≥90% of Diameter |
| Operating Wavelength | 350-2000 nm |
| Focal Length | 75.0 mm |
| Back focal length | 72.1 mm |
| Optical power | 13.3 |
| Design Wavelength | 587.6 nm |
| Refractive Index | 1.5167 |
| Radius of curvature 1 | 44.50 mm |
| Radius of curvature 2 | -289.00 mm |
| Center Thickness | 5.0 mm |
| Edge Thickness [REF] | 2.9 mm (REF) |
| Coating | Uncoated |
| Diameter Tolerance | +0.00/-0.10 mm |
| Thickness Tolerance | ± 0.1 mm |
| Focal Length Tolerance | ± 1% |
| Decentration | < 3 arcmin |
| Surface figure PV value | λ/4 |
| Spherical surface fringe count | 3 |
| Surface quality (scratch/dig) | 10/5 |
Key Features
Datasheet
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