Iridian launches high-uniformity bandpass filters

Jan. 23, 2017
Iridian Spectral Technologies has authored a white paper on the uniformity challenge of large-format NBPFs.

Iridian Spectral Technologies (Ottawa, ON, Canada) has authored a white paper entitled "Large format NBPF--a uniformity challenge" describing its demonstration and manufacture of its extremely uniform large format (130 mm) narrow bandpass filter (NBPF).


An excerpt of the white paper follows:

Large format (>100 mm diameter), narrow bandpass filters (NBPF) are required in many fields. Applications requiring a large collection aperture drive the need for large collection optics, however high wavelength selectivity provided by narrow, flat-top bandpass optical filtering ( is also required to facilitate specific and selective analysis of a phenomena or substance of interest. The diversity of applications of these optics include earth observation remote sensing (whether satellite imaging or UAV mounted LIDAR), astronomical/solar imaging, UV micro-lithography tools, and live animal biological (fluorescence) imaging …

Iridian has addressed each of these challenges and has recently demonstrated the successful design and manufacture of an environmentally stable 1.72 nm-wide (FWHM) NBPF centered near 780 nm to within 20 pm of the wavelength target over an operating clear aperture >125 mm in diameter.

To view the white paper, go to:

SOURCE: Iridian Spectral Technologies;

About the Author

Gail Overton | Senior Editor (2004-2020)

Gail has more than 30 years of engineering, marketing, product management, and editorial experience in the photonics and optical communications industry. Before joining the staff at Laser Focus World in 2004, she held many product management and product marketing roles in the fiber-optics industry, most notably at Hughes (El Segundo, CA), GTE Labs (Waltham, MA), Corning (Corning, NY), Photon Kinetics (Beaverton, OR), and Newport Corporation (Irvine, CA). During her marketing career, Gail published articles in WDM Solutions and Sensors magazine and traveled internationally to conduct product and sales training. Gail received her BS degree in physics, with an emphasis in optics, from San Diego State University in San Diego, CA in May 1986.

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