Achromatic Lens
Achromatic Lenses cement concave and convex elements of materials with different refractive indices and dispersions to minimize or eliminate chromatic aberration. For best performance, the surface with the larger radius, the flatter face, should generally face away from the collimated beam. Chromatic aberration arises from wavelength-dependent dispersion and refractive index, causing different focal positions. A cemented achromatic doublet uses complementary material dispersions to reduce overall chromatic aberration. Achromatic designs also improve imaging of broadband composite sources, reduce spherical aberration with suitable curvatures, and, as stated in the source, improve coma with arbitrary material selection. Compared with singlets, they produce clearer images and smaller spots. Applications include fluorescence microscopy, image relay, inspection, and spectroscopy.
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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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