Diffraction Optical Elements' (doe) Scalar Diffraction Numerical Analysis

Diffractive optical elements have special function and widely used, which has lots of merits that traditionally optics cannot analogy with,so it developed quickly. Take thick holographic gratings as examples, we studies Fraunhofer diffraction of diffractive optical elements.We use two plane waves to interfere to produce a thick holographic grating. The method proceeds by decomposing the thick material into a series of thin slabs, each of which acts simply as a thin grating. Very general applicability can be obtained because all that need be specified are the properties of the thin gratings which may be absorption, phase or mixed. The contents of my paper are(1)Angle of diffraction incidence is 0°,the wavelength is 633nm, with the increase of the thickness, zero order becomes weaker, the first order becomes stronger, till there are 36 thin slabs (i.e. the thickness is 11394nm ) ,light intensity is totally in the first order. This phenomenon obvious reflects Bragg Effect, because it satisfied the Bragg Law. If the wavelength is 515nm or 458nm, the same conclusion can be drawn.(2)There are 40 thin slabs, the light of 515nm is totally in the first order. It satisfied the Bragg effact.(3)Diffraction of incident light of different wavelengths, zero orders are in different places ,and with the increase of wavelengths,the first orders are stronger.(4)Angle of diffraction incidence is 30°,with the increase of the thickness, the first order is stronger, till there are 36 thin slabs (i.e. the thickness is 11394nm ), light intensity is totally in the first order. This phenomenon obvious reflect Bragg Effect, it satisfy the Bragg Law. If the Wavelength is 515nm or 458nm, the same conclusion can be drawn. There are the same as the first results.