SCHOTT: Interference Filters
Specialty glass producer SCHOTT develops and manufactures high-quality customized interference filters for use in a growing number of high-end research and industrial applications. SCHOTT can reportedly design sophisticated filters with extremely low tolerances that allow passage and blocking of differing wavelengths to meet any customer requirements, including new applications.
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.
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 x 106 mm.
“Creating and shipping high-quality filters is particularly important for applications in which filters cannot be easily replaced, such as satellites,” said Ralf Biertuempfel, Ph.D., product manager for Filters at SCHOTT Advanced Optics. “Thanks to our many years of experience in the area of space applications, customers can rest assured knowing that our filters will function perfectly.”
SCHOTT is reportedly 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 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.
“Our experts have experience in converting extremely complex computer calculations of various layer structures into technically realizable solutions” said Biertuempfel. “That saves cost and time by achieving the specification for high-tech filters of up to 300 layers during the first trial.”
For more information, visit www.us.schott.com.