Korth Kristalle GmbH

Refractive Index

1: UHV Viewport | 2: Cleaved Crystal | 3: Microscopy | R: Stratospheric Balloon


We welcome all enquiries - no matter how unusual or challenging – because we know that together we will find the right solution - as we have proven repeatedly in a wide variety of specialist fields (Astronomy, Semi-Conductors, the Environment and Nuclear Research to name but a few).


• Cherenkov Counter

• Semiconductor Wafer

• Coating Substrates

Windows are optical components that only allow the passage of waves within a specific range.  They come in a range of shapes and specifications (e.g. parallelism, surface quality, dimensional tolerances), depending on the type of application.

Lenses are optical components with two refractive faces, of which at least one is convex or concave. The most important property of a lens or array of lenses is its imaging properties. The most crucial aspect of a lens is its focal length, i.e. the measure of how strongly the system converges (focuses) or diverges (defocuses) light. The simplest lenses are spherical lenses: their two surfaces are parts of the surfaces of spheres, with the lens axis ideally perpendicular to both surfaces. Each of the surfaces can be convex (bulging outwards from the lens) or concave (depressed into the lens). As such, the surfaces can be assigned radii of curvature. A distinction is made between converging lenses (two convex faces or one convex and one planar face; ideally, a beam of light running parallel to the optical axis is collected in one point, the focus) or diverging lenses (two concave faces or one concave and one planar face; a beam of light after passing through the lens appears to be emanating from a particular point on the axis in front of the lens.

• IR beamsplitter

• Astronomical

• Stratospheric Balloon


Barium Fluoride

Lead Fluoride

Calcium Fluoride

Lithium Fluoride

Magnesium Oxide

Sodium Chloride

Sodium Fluoride

Rubidium Bromide

Rubidium Chloride

Rubidium Iodide

Strontium Fluoride

Titanium Dioxide