Plano-Concave Lenses
UV Fused Silica · H-K9L (N-BK7 equiv.)
Plano-concave lenses diverge a collimated beam using a concave surface on one side and a flat surface on the other. Commonly used as the negative element in Galilean beam expanders, for increasing system focal length, or for generating divergent beams in laser setups.
Processing Specifications
| Parameter | Standard | Precision |
|---|---|---|
| Diameter Range | Ø5–Ø200mm | Ø5–Ø150mm |
| Diameter Tolerance | ±0.1mm | ±0.05mm |
| Thickness Tolerance | ±0.2mm | ±0.1mm |
| Focal Length Tolerance | ±1% | ±0.5% |
| Surface Quality (S/D) | 40-20 | 20-10 |
| Surface Flatness (flat side) | λ/4 | λ/10 |
| Centration Error | < 3' | < 1' |
| Clear Aperture | > 85% | > 90% |
| Bevel | 0.3×45° | 0.1×45° |
Coating Options
- V-Coat AR — Single wavelength: R < 0.25% per surface
- Broadband AR — Specified wavelength range: R < 1.0% avg
- Uncoated — Available for all materials
- Custom coatings on request — specify wavelength, bandwidth, and AOI
Typical Applications
Galilean Beam ExpandersDiverging Collimated BeamsIncreasing System EFLLaser Beam DivergersTelescope SystemsResearch Setups