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30 September 2003 Electromagnetic theory of concave blazed diffraction grating efficiencies
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The paper presents the calculus of efficiencies in diffracted orders of a concave blazed diffraction grating. The diffraction grating was designed with blazed angles and diffraction spacing variable. We have applied the electromagnetic theory in order to obtain the grating efficiency, which is a sum of all diffracted orders efficiencies. We would expect the sum to be equal to unity. Our result show that this sum is greater than 0.94 and less then unity for some incident angles. The calculation of grating efficiency by means of electromagnetic theory was performed numerically. Our calculations did not take into account of the effect of multiple scattering; that is, light which is scattered from one facet to another before leaving the grating. The various diffracted orders were coupled together by a boundary condition on the surface of the grating. We conclude this groove profile of the grating leads to a better efficiency compared to a typical blazed concave grating.
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Paul Schiopu, Ovidiu D. Iancu, and Laurentiu Dragnea "Electromagnetic theory of concave blazed diffraction grating efficiencies", Proc. SPIE 5227, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, (30 September 2003);

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