Ultra Series Bandpass Filters

High-performance bandpass filters

A variety of ULTRA Series bandpass filters showing high transmission from the UV to the IR.

Figure 1. A variety of ULTRA Series bandpass filters showing high transmission from the UV to the IR.

Through a combination of precision wavelength control, ultra-steep edges, deep blocking, and the industry's highest transmission levels, Alluxa’s ULTRA Series of thin-film optical bandpass filters will optimize the performance of a variety of optics based instruments.

ULTRA Series single band, multiband, and ultra-narrow bandpass filters are all designed and rigorously tested in order to exceed the requirements of the most advanced instruments. They are ideal for use in applications such as fluorescence microscopy, flow cytometry, Raman spectroscopy, LIDAR, and spectral imaging.

Depending on the wavelength ranges and requirements of your system, ULTRA Series bandpass filters can be custom designed to meet one or more of the following challenging specifications:

  • Up to 99% transmission for passbands in the visible range
  • Up to OD10 wide range out of band blocking by design
  • Edge transitions as steep as 0.5% of CWL from 50% T to OD6
  • CWL at any wavelength from the UV to the mid IR (~250 nm to 6.2 µm)
  • Tolerances as tight as ± 0.25% of CWL
  • TWE as low as 0.01 wave RMS / inch measured at 632.8 nm


Multiband filters for fluorescence applications

ULTRA Series multiband filter with steep edges, high transmission, and OD6 out-of-band blocking.

Figure 2. ULTRA Series multiband filter with steep edges, high transmission, and OD6 out-of-band blocking.

ULTRA Series multiband filters can be designed with over 10 transmission bands, greater than OD8 blocking between bands, steep edges, and up to 98% transmission. They are perfect for use as excitation or emission filters in fluorescence techniques that require the simultaneous detection of multiple fluorophores in a single sample.



Quality and consistency from an innovative thin-film coating process

The wavelength control, transmission, and blocking of ULTRA Series filters are highly repeatable over several different coating runs.

Figure 3. The wavelength control, transmission, and blocking of ULTRA Series filters are highly repeatable over several different coating runs.

All of Alluxa's thin film filters are hard-coated using our SIRRUS™ plasma deposition process on equipment that was designed and built by our team. This allows us to reliably and repeatedly produce the same high-performance thin-film bandpass filters over several different coating runs, which translates to consistent performance across all of your systems.

Please contact us for a custom quote or visit our online optical filter catalog to see our selection of ULTRA Series bandpass filters, excitation filters, emission filters, and fluorescence filter sets that are currently in stock.



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Alluxa, The Highest Performing Thin Film Coating Process