Research on processing technology of odd-form off-axis aspherical lens

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.