Method and system for solving light diffraction transmission problems

Abstract

The invention discloses a method and a system for solving the light diffraction transmission problem, and relates to the field of optics. The method includes: constructing a calculation area grid; tracing the chief ray in the calculation area grid, and expanding the first interface of the crystal through which the chief ray passes into an infinite plane; The rays are traced to determine the intersection of other rays and the infinite plane; according to the intersection, it is judged whether other rays are on the same side as the main ray, and if they are on different sides, the virtual rays of other rays are generated, and the virtual rays are assumed to propagate in the crystal. , which follows the same physical propagation law as the chief ray; the diffraction transmission problem is solved according to the chief ray and the virtual ray. The invention can be used for the diffraction transmission calculation process of plane reflection of any shape, has the advantage of strong practicability, and solves the problem that the traditional optical field diffraction transmission solution method cannot be applied in the process of light propagation in non-parallel planes.

Description

technical field [0001] The invention relates to the field of optics, in particular to a method and system for solving the problem of light diffraction transmission. Background technique [0002] The traditional calculation of diffraction transmission of light field usually uses the method of fast Fourier transform plus propagator. First, a calculation area of ​​the light field is constructed, which is usually more than 1.5 times larger than the actual area of ​​the light field, so as to avoid the diffraction caused by the boundary and affect the calculation result. like figure 2 As shown, a schematic diagram of diffraction transmission when light is transmitted directly is provided. The calculation area grid is transferred to the frequency space after FFT, superimposed on the propagator of the dz distance, and then inverse FFT is performed to return to the position space. At this point, the amplification and absorption process can be added to the position space, and then ca...

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Problems solved by technology

[0003] The existing method has no problem in calculating the light in the process of straight line transmission, but in some cases, when it is necessary to calculate the diffractive transmission in the beam reflection process, the existing method will not be directly applicable, especially for the light in non-parallel planes In the process of propagation, multiple reflections are involved, and the traditional solution method of light field diffraction transmission cannot be applied

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