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September 30, 2008  

Semrock Announces Breakthrough: Ultrawide-passband with Deep-notch Thin-film Filters

ROCHESTER, NY – Semrock Inc., the leader in optical filters for biotech and analytical instrumentation, has announced a breakthrough invention in thin-film optical filters: ultrawide-passband yet deep thin-film notch filters. These new notch filters achieve the deep (optical density > 6) laser-line blocking of Semrock's renowned StopLine® notch filters, yet with low-ripple passbands that now extend from the ultraviolet (350 nm) well into the near-infrared (1600 nm). These new "E-grade" StopLine filters are in stock and immediately available for the most popular laser wavelengths, including 488, 532, 561, and 808 nm, with more coming.

"Thin-film notch filters are the ideal solution for applications that require nearly complete rejection of a laser line while passing as much non-laser light as possible," explained Dr. Turan Erdogan, Semrock's CTO. "In addition to exceptional transmission with deep and narrow laser line blocking, modern multilayer thin-film notch filters offer an environmentally stable, optically durable and compact solution for today's laser-based optical systems. However, until now even the best thin-film notch filters either had a limited range of transmission due to the higher harmonics of the main reflection band , or a relatively limited attenuation at the laser wavelength. When a wider passband was needed, optical engineers had to turn to less reliable, less convenient and costlier holographic notch filters, or to Rugate notch filters with lower laser-line attenuation. Now Semrock's unique (patent pending) new E-grade StopLine filters bring together wide passband performance with all the advantages of deep-notch thin-film filters."

These new wide-passband notch filters are intended for any application requiring high rejection of one or more laser lines, while transmitting signal light over a wide range of wavelengths on either side of the laser wavelength. They are especially suited for systems addressing multiple regions of the optical spectrum (e.g., ultraviolet, visible, and near-infrared), and for systems based on multiple detection modes (e.g., fluorescence, Raman spectroscopy, laser-induced breakdown spectroscopy, etc.).

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Semrock manufactures quality optical filters that set the standard in performance and reliability for the biotech and analytical instrumentation markets. All Semrock optical filters are made with hard Ion Beam Sputtered optical coatings. OEM filters are manufactured in volume. End-users benefit from a wide selection of standard catalog products that ship from stock. Semrock's patented and patent-pending products include the highly acclaimed BrightLine series of fluorescence filters for research and clinical microscopy, high-throughput screening, real-time PCR, and other fluorescence-based instrumentation; state-of-the-art filters for Raman spectroscopy; and other unique laser analytical instrumentation filters. Semrock's innovative products, made possible by combining modern ion-beam sputtering with Semrock's proprietary volume manufacturing technology, are covered under an industry-leading five-year warranty.

Founded in September 2000, Semrock is based in Rochester, New York, a well-known center of optics, and has sales offices throughout the United States. For additional information about Semrock, its products, and its team of international distributors, visit the company website at www.semrock.com.

StopLine, BrightLine and Semrock are registered trademarks of Semrock, Inc.

Amanda Valek-MacDonald
Semrock, Inc.