Korth Kristalle GmbH

Refractive Index

A. Otto, Head of Sales | I. Panterott, Sales | Dr. Knorr, technic. Support | H. Korth, Head of Production

Clearly Good Service.

“Clearly” – used here not just because good service comes naturally to us but because we also focus on transparency.

Good communication with our clients is essential. As an ISO-certified business we measure our success not just by the quality of our products but also by the customer service we provide. It is very important to us to provide individually tailored customer care and advice.

We will help you solve any application problems and can advise on the right choice of materials for any application:

Tel. +49 (0)431 36 90 50 or info@korth.de.

If you would like to take a look “behind the scenes” of our company please click on: Our Day - this link will take you to our photo gallery and give you an idea of our business and the various production stages leading to your finished product.

In addition to our expert advice we offer the following services:

Repair We can repair your damaged optical components and improve, adapt or rework them. Please call or use our request form
Coating HR and AR Coating
for IR, VIS and UV
Beam splitter Protective coatings Bandpass filter
Testing  Transmission spectroscopy Stress induced birefringence Birefringence, or double refraction, is the decomposition of a ray of light into two rays when it passes through certain anisotropic materials. Isotropic solids do not exhibit birefringence unless under mechanical stress, either due to stress applied externally or as part of the manufacturing process. Mechanical stress affects the optical properties of certain materials which is undesirable in many applications (e.g. lenses for polarizing optics).  The ability to understand and quantify residual stress and its effect on optical components is therefore essential in controlling the parameters of crystal growth and optimising quality.
Surface roughness
Wavefront distortion Where a homogenous light beam consisting of many light waves passes through an inhomogeneous material with a varying refractive index n (density variations in the material) or of non-uniform thickness, the individual light waves will be distorted proportionally to the distance travelled through the material, resulting in a deterioration of the optical image. This can be measured by analyzing the interference patterns in a two-arm or phase-shifting interferometer, where one “arm” contains the material to be measured and the other a reference sample. 
Centring error