Plano-Concave Lens, N-BK7, Uncoated: 350-2000 nm OLE140136
Plano-concave lenses have one flat and one concave surface, negative focal length, and can produce reduced images or diverge light. JCOPTIX lenses use N-BK7 glass. N-BK7 is the most common borosilicate crown optical glass, offering excellent optics at moderate cost. N-BK7's high homogeneity, few bubbles, low impurities, and easy manufacture suit visible and near-infrared applications. N-BK7 often replaces UV fused silica where high UV transmission and lower thermal expansion are unnecessary. JCOPTIX offers diameters of 12.7 mm and 25.4 mm, uncoated for broad bandwidth and high damage threshold or antireflection-coated for 350-700 nm, 650-1100 nm, or 1050-1700 nm. The coatings reduce average reflection below 0.5% per surface within the operating band to improve transmission. Contact technical support for other custom requirements.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | N-BK7 |
| Diameter | 12.7 mm |
| Clear Aperture Dimension [of Diameter] | >90% of Diameter |
| Operating Wavelength | 350-2000 nm |
| Focal Length | -50.0 mm |
| Back focal length | -52.3 mm |
| Optical power | -20.0 |
| Abbe Number v_d | v_d=64.17 |
| Design Wavelength | 587.6 nm |
| Refractive Index | 1.515 |
| Radius | -25.7 mm |
| Center Thickness | 3.5 mm |
| Edge Thickness [REF] | 4.3 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 flatness [@633 nm] | λ/2 |
| Surface quality (scratch/dig) | 40/20 |
Key Features
Datasheet
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Supplier Information
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