Plano-Concave Lens
Plano Concave Lenses convert parallel beams to divergent rays that trace backward to a virtual focus. They have negative focal length, one flat surface, and one concave surface. They diverge a collimated beam from a virtual focus and are commonly used in Galilean beam expanders. The concave surface faces the incident beam, while the flat side faces the focal plane being processed. Negative focal length and negative spherical aberration can compensate aberrations from other lenses. Dongkeda offers various sizes and focal lengths, with precision manufacturing capability for medium and large apertures exceeding 100 mm. Materials include K9 optical glass for visible and near-infrared, germanium, silicon, and calcium fluoride for infrared, and fused silica for ultraviolet. Coating options meet different applications and wavelength 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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