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Ultraviolet Filters: Past and Present

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Bandpass filters are passive optical devices that control the flow of light. They are used to isolate certain wavelengths or colors. Applications range from detecting the gaseous composition of a distant star to visualizing the chemical activity in a human cell. Ultraviolet (UV) bandpass filters (with effective wavelength ranges below 400 nm) pose unique design and manufacturing challenges related to the absorption of materials at short wavelengths.

Robert L. Johnson, D.Sc. and Sarah Locknar, PhD, Omega Optical, Inc.

In their earliest forms, UV bandpass filters that were optimized for wavelengths less than 400 nm, such as the Schott UG or the Hoya U-series, were constructed of absorbing compounds in glass. Such filters were limited by the available compounds that can be dissolved or suspended in glass, and they...Read full article

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