Biconcave Lens
The source describes biconcave lenses as having positive focal length for reducing beams or focal lengths and magnifying images. It states that collimated-light focusing should enter the curved surface to reduce spherical aberration, while point-source collimation enters both surfaces. It describes point focusing for monochromatic alignment, with the concave side facing input. AR-coated germanium, silicon or ZnSe substrates suit IR; fused silica suits UV. Both surfaces are concave, with curvature centers on opposite sides.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Optical Glass K9, Quartz, Fused Silica, BK7, Calcium Fluoride |
| Dimensions | φ5mm~400mm |
| Dimensional Tolerance | -0.02~0.1mm |
| Center Thickness Tolerance | -0.02~0.1mm |
| Radius of Curvature Tolerance | <0.001mm |
| Surface Finish | 10/5～60/40 |
| Surface Figure | λ/8～λ/2 |
| Clear Aperture | >90% |
| Edge Bevel | <0.3mm*45° |
| Coating | Antireflection-Coated |
Datasheet
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