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Quality Digest


Multicavity Bandpass Filter With Extremely Narrow Bandwidth

Transmission above 85%

Published: Wednesday, November 15, 2023 - 12:00

(Alluxa: Santa Rosa, CA) -- With bandwidths down to 0.1 nm, ultranarrow bandpass filters from Alluxa cover the requirements of current quantum technologies, where 0.2 to 0.5 nm are in demand. At the desired wavelength, they offer transmission of over 85% while blocking the remaining wavelengths with an optical density of >OD6. These optics, distributed by Laser Components, are especially suitable for applications where the signal-to-noise ratio plays a decisive role. In addition to spectroscopy, plasma monitoring, and fusion research, these include hydrogen-alpha (H-alpha) emission line filters for astronomy.

Despite the low bandwidth, layer designs with up to five cavities are used to filter out interfering secondary modes in lasers. Their number is crucial for the shape and edge steepness of the bandpass. Since complex interactions occur between these two parameters, Laser Components recommends that details in the filter design be closely coordinated with the company’s experts.


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