Optical Differential Operation Based On Anisotropic Crystal

In the information age,people have a higher demand for information acquisition.Optical analog calculation does not need to consider complex algorithms.The characteristics of fast imaging and low energy consumption make it different from traditional digital calculations.Optical differentiation,as an important branch of optical analog calculation,has the advantages of low energy consumption,simple structure and high efficiency.Optical differentiation is an important method of differential operation in the field of analog signal modulation.It is an important means of optical processing.It mainly acts as a spatial filter that removes the low-frequency components in the image and highlights the high-frequency components of the image,so that the outline of the image is fully reflected.Optical differential originated from the category of space optics.In order to explore the potential applications of optical differential operations in edge image processing and pursue the miniaturization of devices and platforms,this thesis is different from the earlier principles of optical spin hall effect and surface plasmons,we innovatively introduces anisotropic crystals as the core component of optical differentiation.The main research work and results are as follows:(1)Designed and implemented a differential processor related to anisotropic crystals.The differential processor is the core of the differential operation,and its optical principle is based on the birefringence effect of the anisot ropic structure crystal.The essence of spatial optical differentiation is a differential beam in space,and birefringence is the inherent optical characteristic of anisotropic structure crystals,which is highly controllable.Common anisotropic crystal structure materials include calcite,quartz and so on,they are simple and easy to obtain,and can achieve an ideal beam splitting state with proper processing.The paper introduces the design idea of the differentiator in detail,adding a glass slide at the export side,and passing through mutually orthogonal polarizers,the incident beam can realize optical differentiation calculation.(2)With the help of quantum weak measurement tools,experimental research on optical edge imaging.The experiment observed the weak birefringence effect in the birefringent beam splitter,and tested the crystal birefringence and its image processing effect.In this paper,the change curve of the optical space transfer function is realized by analyzing and sorting out the experimental data,and the correctness of this method is verified.Experimental results show that image information can be effectively presented with multi-dimensional edges.In summary,this work provides new ideas for processing edge images and new possibilities for spatial optical differentiation.