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Christiansen filter

The Christiansen filter (named after Danish physicist Christian Christiansen) is a narrow bandpass or monochromatic optical filter based upon a coarse transparent powder immersed in a transparent liquid. The liquid and powder have differing values of dispersion, while having identical refractive indices at one particular wavelength. As a result, light of that wavelength passes through the filter unaffected, while light of all other wavelengths is scattered by refraction. A typical filter is composed of glass particles immersed in a mixture of benzene and carbon disulfide. The wavelength of operation can be varied by changing the percentage of the two components of the liquid mixture, or by varying the temperature.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Christiansen_filter". A list of authors is available in Wikipedia.
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