| Due to its unique dispersive and environment temperature characteristics, small size as well as reduced weight, diffractive optical elements can offer optical designer more freedom in design and more materials to select. Currently, most of the IR diffractive elements are processed with diamond machine. Although many organizations have carried out some research in DOEs in this nation, fewer applications are found in the visible spectrum with single point diamond turning. Even some of the organizations have made some progress in this field, but they are still in lab testing phase and far away from batch production.In this paper the effect of diamond turning tool shape and cutting feed on the microstructure of diffractive optical elements (DOEs) was discussed. The relation was analyzed among total integrated scattering (TIS) caused by surface roughness of DOEs, tip radii of cutting tools and cutting feed. According to the discussion and analysis, method of selection of cutting tools and cutting feed was given with the consideration of blocking effect and cutting time. The surface microstructure of diffractive elements was simulated by mathematical software. A hybrid diffractive-refractive eyepiece was designed which working range is from 0.4861μm to 0.6563μm. It contains 427 zones. The last zone is 20μm wide. According to analysis of the result, the diffractive element can be fabricated in practice by diamond turning. It is feasible to the analysis of process parameters made. |
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