In the high-energy laser test system, surface profile and finish of the optical element are put forward higher request. Taking a focusing aspherical zerodur lens with a diameter of 100mm as example, using CNC and classical machining method of combining surface profile and surface quality of the lens were investigated. Taking profilometer and high power microscope measurement results as a guide, by testing and simulation analysis, process parameters were improved constantly in the process of manufacturing. Mid and high frequency error were trimmed and improved so that the surface form gradually converged to the required accuracy. The experimental results show that the final accuracy of the surface is less than 0.5μm and the surface finish is □, which fulfils the accuracy requirement of aspherical focusing lens in optical system.
With the development of advanced optical processing technology, the off-axis aspherical lens are the vital optical device for the high precision measurement and machining system. Off-axis aspherical lens can not only reduce the complexity of the system, but also increase the breadth of coverage to get closer to the ideal image. In order to get high efficiency and high surface accuracy, the off-axis aspherical lens processing and testing methods are deeply researched. The processing of traditional off-axis aspherical lens process coaxial aspherical lens first, then cut it to off-axis aspherical lens. This method is prone to edge spliting and on the surface of the secondary damage. This article presents a novel processing technology - splicing processing technology. The technology can guarantee the accuracy of polishing the surface type, and to avoid secondary damage to the surface, to achieve high-precision off-axis aspherical lens machining. The off-axis aspherical lens are tested by Taylor Hobson profilometer. The off-axis aspheric surface figure can get 0.715 μm, the surface polish can achieve the Grade II. Therefore, a high efficiency, reproducible off-axis aspherical polishing method were summarized. The off-axis aspherical lens to achieve mass production.
Aspherical cylindrical lens compared with the cylindrical lens, they improved image quality and optical properties, simplified the system architecture. They applied in many fields, such as high power laser system, fax machines and typographical scan imaging system, as well as bar code scanning, lighting and other aspects of holography. Aspherical cylindrical lens are centrosymmetric. It is difficult to process. Parallel with the side line and bus bar line is difficult to ensure. Machining accuracy is low. It is usually about 15 μm, that not sufficient to meet the needs of modern highprecision laser systems. These have become a major problem restricting its development. Combining traditional and modern polishing techniques, a new technique for polishing aspherical cylindrical lens is proposed-- longitudinal feedback compensation technology. With dimensions of 15 × 5 × 5 mm quartz aspherical cylindrical lens as an example, the surface profilometer results of detection of the workpiece usually, modify the shape of the polishing surface of the mold, to control the size of the area of the polishing, the surface of the workpiece to achieve the effect of the type of compensation. After repeated testing and feedback compensation, gradually improve the accuracy of the workpiece surface type. The results show that this technique can effectively improve the precision aspherical cylindrical lens. After detection the workpiece surface accuracy is 0.8μm, the surface finish is Class II. It has the actual production of a certain application value.
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