Specification of spectral line shape and dispersion of a medium by self-imaging and moire techniques

Mohammad Taghi Tavassoly; Mohammad Abolhassani

doi:10.1117/12.445570

23 October 2001 Specification of spectral line shape and dispersion of a medium by self-imaging and moire techniques

Mohammad Taghi Tavassoly, Mohammad Abolhassani

Proceedings Volume 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design; (2001) https://doi.org/10.1117/12.445570
Event: Lasers in Metrology and Art Conservation, 2001, Munich, Germany

Abstract

Due to finite width of a spectral line, the visibility of the more fringes, formed by a grating and the image of another similar grating, produced by self-imaging technique, reduces by the increase of the image order. This effect has been exploited to specify the line shape, by taking Fourier transform from the visibility curve of the more fringes. The technique also renders to specify the non symmetric spectral line shapes, which are very difficult to determine by interferometric techniques. When a dispersive material, liquid or solid, is held between the gratings the visibility curve changes. It is shown that by comparing the Fourier transforms of the visibility curves obtained with and without sample, the dispersion function of the latter can be specified.

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Mohammad Taghi Tavassoly and Mohammad Abolhassani "Specification of spectral line shape and dispersion of a medium by self-imaging and moire techniques", Proc. SPIE 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design, (23 October 2001); https://doi.org/10.1117/12.445570

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KEYWORDS

Moire patterns

Visibility

Fourier transforms

Refractive index

Interferometry

Sensors

Solids

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