Diffraction fields of combined cosine-gratings
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Received Date:
2010-01-25
Accepted Date:
2010-03-08
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Abstract
In order to analyze diffraction fields of combined cosine-gratings, considering the influence of the limited aperture of the gratings, the elements of the diffraction fields of the combined cosine-gratings were obtained and the corresponding integral expressions of the diffraction fields were derived based on the method of wavefront phase-factors. Then the formulae of the amplitude distribution of diffraction fields were deduced. Finally the amplitude and intensity distribution along the axis, the transverse line-width and axial line-width of that real focal-spot were obtained. This study may further provide a theoretical foundation for the application of combined cosine-gratings in filtering and optical signal processing.
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