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January 21, 2005  

Semrock Adds 325 nm MaxLine™ Laser-line Filter with Unprecedented UV performance

Rochester, N.Y. - Semrock, Inc., today announced the introduction of a new 325 nm MaxLine laser-line filter with unprecedented UV performance. This filter boasts > 65% peak transmission at the laser line, as compared to the previous industry norm of less than 25%, while rapidly rolling off to an optical density (OD) > 5 at wavelengths differing by only one percent from the laser wavelength. The 325 nm wavelength corresponds to a popular line of the Helium-Cadmium (HeCd) laser. This MaxLine filter is ideally complemented by Semrock's best-selling 325 nm RazorEdge™ filter, which offers the highest optical discrimination when used with the corresponding detection systems.

To also support HeCd laser applications which use the popular 441.6 nm line, Semrock has now introduced a high-performance 441.6 nm MaxLine filter with > 90% peak transmission, and a deep-blocking, highly versatile StopLine™ notch filter with OD > 6 attenuation of the 441.6 nm line. These join Semrock's 441.6 nm RazorEdge filter.

These filters now make it possible to expand the use of HeCd lasers for a number of demanding applications, and they make the most efficient use of the available light. They are ideal for Raman spectroscopy, especially when it is critical to obtain information very close to the laser line. For the most sensitive and specific fluorescence measurements, the filters make it possible to essentially completely eliminate all light except the laser line before the sample and the laser line itself after the sample.

"Traditionally users of even the highest-performance optical filters for UV wavelengths have had to settle for poor transmission due to materials absorption and coating technology limitations," commented Semrock's CTO Turan Erdogan. "With these new filters, there is no more unnecessary wasting of precious UV laser light."

These new filters have the same proven reliability of all Semrock filters – they are made exclusively with hard-coating technology without any adhesives in the optical path. Their exceptional optical performance is made possible by combining modern ion-beam sputtering with Semrock's proprietary optical-coating technology.




About Semrock:
Semrock manufactures reliable high-performance optical filters that are setting the standard in optics for the biotech and analytical instrumentation markets. Semrock's industry-leading products include the highly acclaimed BrightLine™ series of fluorescence filters for microscopy, flow cytometry and other fluorescence-based instrumentation, exceptional filters for Raman spectroscopy, and unique biomedical laser system optics. Semrock's innovative products are made possible by combining modern ion-beam sputtering with Semrock's proprietary technology. 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.

Amanda Valek-MacDonald
Semrock, a Unit of IDEX Corporation