Korth Kristalle GmbH

Refractive Index

1: ZnSe window | 2: Si half cylinder | 3: ZnSe ATR rod | 4: Analytics


Being able to accurately identify materials and undertake targeted analysis simplifies decision making and minimises risk, not just in industrial quality control (in areas such as pharmaceuticals, the food industry, the chemical industry, etc.) but also in the fields of university study and research.

We can deliver a wide range of components for transmission spectroscopy, one of the basic analytical tools for the whole spectrum (VUV-Ultraviolet-Visible-NIR-FIR), but we also carry specialist components for X-ray analysis and tetra hertz spectroscopy amongst others.


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.

ATR crystals are used for ATR spectroscopy  (ATR= attenuated total reflection). This is a sampling technique used in conjunction with infrared spectroscopy which enables opaque samples to be examined directly in the solid, liquid or gas state without further preparation e.g. coatings, polymer foils and liquid samples, e.g. solvent mixtures. The method was first presented by Harrick in 1960 and Fahrenfort in 1961. Measuring the intensity of the reflected light allows conclusions to be drawn about the sample. The core element of this method is the internal reflection element (IRE) which uses a property of total internal reflection resulting in an evanescent wave. The IRE is usually a special ATR crystal, which allows for multiple refractions.

• Cuvettes and Equipment

• Gas Cells

• FTIR Beamsplitter

• X Ray-

• F Ion-selective

Spectroscopy is a collective term used to describe methods to analyse the radiative energy of samples by dispersing their radiative energy by wavelength. Spectroscopes are used for the visual inspection of optical spectra.  Spectrometers are recording devices and are also used for other ranges of the electro-magnetic spectrum as well as particles like electrons and ions. Samples can be irradiated resulting in different emissions which can then be analysed. The oldest spectroscopic methods (called classical spectroscopy) involve the study of light emission and absorption by molecules and atoms using grating and prism spectrometers. Molecular spectroscopy studies the interaction of molecules with electro-magnetic fields. It allows for the identification of molecular properties such as bonding length and strength and the identification of atomic fragments. Molecular spectra differ from atomic spectra by many more, often overlapping lines or bands. The reason for this is that molecules not only absorb or emit energy by electron transfers but also by vibrations of atoms against one another and molecular rotation around one of their axis. Equipment for VUV / UV-VIS-NIR / FTIR/Terahertz


Barium Fluoride

Calcium Fluoride

Caesium Bromide

Caesium Iodide

Potassium Bromide

Potassium Chloride

Potassium Iodide

KRS-5, KRS-6

Lanthan Fluoride

Lithium Fluoride

Sodium Chloride

Fused Silica

Quartz crystalline


Silver Bromide

Silver Chloride

Zinc Selenide