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Proceedings Paper

CIE colorimetric system fails to calculate the chroma of a Nd:YAG crystal under the fluorescent illuminant F7
Author(s): Yan Liu; Qinghan Chen; Xianhui Bu; Pingyun Feng
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Paper Abstract

The rare earth element neodymium doped yttrium aluminum garnet (Nd:YAG) is a laser crystal widely used for producing laser in the infrared range. Neodymium causes many characteristic absorption peaks in the transmittance spectrum of the Nd:YAG crystal in the visible range. The crystal appears pink under daylight and incandescent light, and colorless under fluorescent light. The colorimetric calculation results of chroma under the CIE standard fluorescent illuminant F7 do not agree with the color appearance under fluorescent light. The calculated chroma values should be near zero to agree with a colorless appearance, but it is actually 11.79 in the CIELAB color space. This failure of the colorimetric calculation is caused by the color matching functions of the CIE colorimetric observers. The color matching functions do not agree with the spectral sensitivity curves of the human eye, especially the x(λ) function does not matches the spectral sensitivity curve of the long wavelength cone photoreceptors.

Paper Details

Date Published: 6 June 2002
PDF: 4 pages
Proc. SPIE 4421, 9th Congress of the International Colour Association, (6 June 2002); doi: 10.1117/12.464546
Show Author Affiliations
Yan Liu, Liu Research Labs. (United States)
Qinghan Chen, South-West Technical Physics Institute (China)
Xianhui Bu, Univ. of California/Santa Barbara (United States)
Pingyun Feng, Univ. of California/Riverside (United States)


Published in SPIE Proceedings Vol. 4421:
9th Congress of the International Colour Association

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