The high transmission of BrightLine® filters results from a simple filter structure with thin-film coatings on the outer surfaces of a single piece of glass. These exceptionally durable coatings are as hard as the underlying glass, allowing them to be easily handled and cleaned.

• fewer interfaces means lower reflection and scattering losses
• no adhesive means the clearest possible optical path with no autofluorescence
• no uncoated surfaces means there's no need for additional anti-reflection (AR) coatings

Typical spectra of BrightLine® filters for the popular fluorophore FITC

Unrivaled Filter Life

All Semrock filters are made exclusively with hard coatings for unrivaled reliability and longevity. These extremely durable coatings are deposited onto the outer surfaces of a single piece of glass, with no adhesive to leak or degrade. The conventional approach to making high-performance fluorescence filters makes use soft coatings that are easily damaged and absorb water vapor, causing significant spectral shifts and ultimately permanent degradation. To protect the soft coatings as much as possible, multiple glass substrates are laminated together with adhesives, resulting in compromised filter performance.

The hard coatings used on BrightLine® filters are as durable as the glass substrate itself. Therefore, handling of these filters is greatly simplified, and a dirty filter can simply be cleaned with alcohol or even acetone. With this improvement fluorescence microscope users can even populate their own filter cubes!

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