Germanium Optical Aspheric Lens Single Crystal Chalcogenide Lens

Processing custom infrared single crystal germanium, chalcogenide glass lens

It can be used in infrared optical system to turn and process aspherical lens and diffraction surface. The diameter of parts covers 10mm-250mm. For coaxial aspherical surface, the surface shape accuracy is better than PV 0.3μm, and the surface roughness plating is better than RMS 5nm.

In contrast to their plano-convex counterparts, these ZnSe aspheric lenses are typically used to focus or collimate light without introducing spherical aberration into the transmitted wavefront. For monochromatic sources, spherical aberration is often what prevents a single spherical lens from achieving diffraction limited performance when focusing or collimating light. Thus, an aspheric lens is often the best single-element solution for many applications including collimating the output of a fiber or laser, coupling light into a fiber, spatial filtering, or imaging light onto a detector. When used for collimation, the plano surface should face the laser or other point source for best performance. Due to their relatively high refractive index (~2.4), ZnSe aspheres can be designed with shorter focal lengths and lower dispersion than comparable aspheres made from other materials, such as CaF2.

When handling optics, one should always wear gloves. This is especially true when working with zinc selenide, as it is a hazardous material. For your safety, please follow all proper precautions, including wearing gloves when handling these lenses and thoroughly washing your hands afterward. Due to the low hardness of ZnSe, additional care should be taken to not damage these lenses. 

Map Optical offers non-coated and coated anti-reflection lenses with aspheric surfaces.
Antireflection membrane options include IR1, NIR2.
Zinc selenide based sheets are suitable for infrared applications.

Aspheric lenses are designed with a single element, which helps to minimize the number of lenses in multi-lens optical fittings.

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