Triple Band Filters

Bandpass filters are optical components with layers that work together to transmit only a small range of wavelengths through the filter while blocking adjacent light on either side. These filters work best with light at a 0° angle of incidence. Bandpass filters can have either narrowband transmission fields that transmit only a small, limited short wavelength region or wideband transmission fields that allow for a wider range of wavelength transmission.

Multiband optical filters are named for their multiple block and transmission fields. At Evaporated Coatings, we have the experience and expertise to manufacture triple band filters for various applications. We specialize in precise optical coatings for narrowband and wideband filters, long wave and short wave pass filters, and more. Each of these coatings can be applied to optical components such as filter glass, temperature-sensitive parts, fiber ends, and more.

What Are Triple Band Filters?

Triple band filters, also called multiband filters or triband filters, are bandpass filters with three distinct wavelength regions that can be transmitted through the component. The filters are precision coatings that interact only with certain wavelengths of light. For example, a triple band filter might allow light with wavelengths of 450, 510, and 640 through the filter while blocking all other light. Microscopists can use these filters to excite, detect, and isolate fluorophores and distinct types of fluorescence in a given sample; because triple band filters can detect three types of light at once, they can handle these tasks simultaneously for multiple wavelengths.

Triple band filters are built for precise in-band transmission and out-of-band blocking so operators can accurately use fluorescence instruments. It’s important to look for filters that accurately guarantee in-band and out-of-band performance through both high-quality filters and durable components construction. Many triple band filters also feature a hard exterior coating that resists damage over the life of the filter.

Applications of Triple Band Filters

Triple band filters allow the operators of optical tools and scientific instruments to investigate samples within narrow bands of light. Some of the most common applications of triple band filters include:

• Triple band filters allow astrophotographers to take pictures in areas affected by light pollution and moonlight. These conditions interfere with photographing night-sky features, but triple band filters suppress unwanted wavelengths of light so photographers can focus on specific features or space objects.
• High-Speed Imagery. Triple band filters have excellent transmission and can maximize brightness and contrast for crystal-clear images.
• Live Cell Analysis. Fluorescent bandpass filters allow scientists to examine fluorophore samples for clinical chemistry, biotech testing, and more. The filters even allow for in-depth examination of DNA sequences.

Triple Band Filters From ECI

For over 60 years, Evaporated Coatings has been a leading provider of high-quality optical coatings, including multi band filters, which allow optical tools to focus on narrow spectrums of light for clearer imaging with less interference. We design, produce, and customize optical filter coatings and provide technical coating and QA services. Contact our sales engineers today to find the right solution for your company’s optical coating needs.