Biconcave Lens
Double-concave lenses diverge parallel light, with negative focal length and two equal-curvature concave surfaces. Used in expansion, collimation, projection and extending system focal length, they also diverge converging beams and are called negative spherical lenses. Virtual-focus divergence suits Galilean expanders. Dongkeda supplies varied sizes/focal lengths, including precision apertures above 100mm. K9 serves VIS/NIR; germanium, silicon and calcium fluoride serve IR; fused silica serves UV. Coatings adapt applications/bands.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Diameter Error | +0.0mm/-0.1--0.02mm |
| Center-thickness error | ±0.05--0.02mm |
| Surface-figure irregularity [632.8nm] | λ/4-- λ/20@632.8nm |
| Effective-focal-length error | ±0.1% |
| Lens centering error | 1arcmin |
| Surface Finish | 20/10 – 60/40 |
Datasheet
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Supplier Information
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