Wuhan Siwer Optics Co.,Ltd
High quality products and professional services.
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Our N-BK7 Plano-Concave lenses are available uncoated or coated with a variety of multi-layer antireflection coatings. All lenses feature λ/4 surface accuracy and 40-20 scratch-dig surface quality. N-BK7 is an excellent lens material for most visible and NIR applications. It provides great performance at a good value with its high homogeneity, low bubble and inclusion content and straightforward manufacturability.
| Common Specifications | |
| Lens Shape | Plano-Concave |
| Substrate Material | N-BK7 or H-K9L |
| Wavelength Range | 350 nm - 2.0 µm |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±1% |
| Design Wavelength | 587.6 nm |
| Index of Refraction@ 633 nm | 1.515 |
| Surface Quality | 40-20 Scratch-Dig |
| Surface Flatness(Plano Side) | λ/2 |
| Spherical Surface Accuracy (Concave Side) | 3λ/2 |
| Surface Irregularity(Peak to Valley) | λ/4 |
| Abbe Number | vd = 64.17 |
| Centration | <3 arcmin |
| Clear Aperture | >90% of Diameter |
