Article | October 16, 2023

Temperature Dependence In Optical Filters

Source: Alluxa, Inc.

Interference filters are influenced by temperature variations, causing either a red shift in extreme heat or a blue shift in extreme cold due to the expansion or contraction of thin-film layers. This phenomenon is particularly significant for ultra-narrowband filters and is measured in pm/°C. Thoughtful design and substrate selection are vital to minimize substantial shifts in interference filter spectra due to temperature fluctuations.

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