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Mohammad Abolhassani

Mohammad Abolhassani

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0001-6112-0709
Education: PhD.
ScopusId: 16174353100
Faculty: Science
Address: Arak University
Phone:

Research

Title
Specification of spectral line shape and multiplex dispersion by self-imaging and moire technique
Type
JournalPaper
Keywords
Moire technique; Self-imaging; Line shape; Dispersion function
Year
2004
Journal Optics and Lasers in Engineering
DOI
Researchers Mohammad Abolhassani ، Mohammad Taghi Tavassoly

Abstract

Due to finite width of a spectral line,the visibility of the moire fringes formed by a grating and the self-image of another similar grating reduces by the increase of the self-image order. This effect is exploited to specify the spectral line shape by evaluating the Fourier transform of a function related to the visibility. Even, by using in-expensive optics, the technique can provide the spectral line shapes of rather broad widths—of the order of nanometer and more—by precisions that are comparable by those obtained by expensive Fourier transform spectrometers.Besides, it is shown that by comparing the line shapes obtained with and without a dispersive medium between the gratings, one can specify the dispersion function of the medium in the wavelength range covered by the spectrum.