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Highly Sophisticated Interference Filters Available from SCHOTT

Specialty glass expert SCHOTT develops and manufactures high-quality customized interference filters for use in a growing number of high-end research and industrial applications. SCHOTT can design sophisticated filters with extremely low tolerances that allow passage and blocking of differing wavelengths to meet any customer requirements, including new applications.

SCHOTT is capable of developing and manufacturing sophisticated high-performance interference filters. Photo: SCHOTT.

The filters can be used in the field of astronomy, such as in the T80/JAST telescope, which was recently put into operation in Spain. They are also used in everything from coatings for high-performance laser applications to medical diagnostics technology, such as sophisticated fluorescence filters and Raman filters. SCHOTT will be exhibiting its filters and other optical glass products at LASER World of Photonics in Munich, Germany from June 22 to 25, 2015 (Booth B1/310).

The company recently manufactured the first lot of 70 customer-specific interference filters for the Observatorio Astrofisico de Javalambre in Spain, which will be used to assist in space observation. These extremely narrow bandpass filters enable astronomers to analyze narrow spectral regions of starlight, while accurately blocking out unwanted wavelengths. Furthermore, the filters are conceived for low wavefront errors, and therefore deliver extremely high image quality. In addition, the transmission spectrum is very homogeneous across the entire surface, which is approximately 106 mm by 106 mm.

“Creating and shipping high-quality filters is particularly important for applications in which filters cannot be easily replaced, such as satellites. Thanks to our many years of experience in the area of space applications, customers can rest assured knowing that our filters will function perfectly.”

Dr.-Ing. Ralf Biertuempfel, Product Manager for Filters at SCHOTT Advanced Optics

SCHOTT is capable of developing and manufacturing sophisticated high-performance interference filters due to its more than 85 years of production experience. In the late 1920s, the company started developing interference filters and antireflective coatings. Today, at SCHOTT’s Center of Excellence in Yverdon, Switzerland, a state-of-the-art coating facility, scientists can create filters for a broad range of applications while ensuring a high product reproducibility. The Center of Excellence houses magnetron and ion beam sputtering systems, among others; high-quality polishing machines; and optical online monitoring systems to ensure high process stability. Extremely precise wavefront measurement devices can be used to verify that the imaging quality of the filter meets each customer’s specifications.

SCHOTT is also capable of providing customized solutions that can meet even the most unusual requirements. “Our experts have experience in converting extremely complex computer calculations of various layer structures into technically realizable solutions. That saves cost and time by achieving the specification for high-tech filters of up to 300 layers during the first trial,” explained Biertuempfel.

Interference filters are also used in blood analysis devices, gas chromatographs, and waste water and combustion analysis devices. “The range of potential applications is immense,” concluded Biertuempfel. “We are a reliable partner because we speak the language of the industry and are capable of reacting to customer needs with flexibility and ease, even if they pertain to complex future applications.”

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