Establishment and analysis of feasibility evaluation system and ultra-precision manufacturing technology for small aperture free-form surface optical element

Abstract

Free-form optical elements are more and more broadly used in modern optical systems due to their distinctive characteristics. In order to realize the high precision manufacturing of free-form optical element, the constraints on parameters of manufacture and measurement were established based on the designing parameters of free-form optical element. Meanwhile, the evaluation system for the machinability and detectability of free-form optical element were obtained by means of the corresponding mathematical model. Furthermore, the White Light Interference (WLI) stitching detection technology, coupled with the least square multi-parameter optimization algorithm, was used to solve shape-error measurement of free-form optical element. Additionally, a free-form surface compensation manufacturing mechanism of asymmetric shape error was established. Based on the above methods, the polynomial free-form optics were processed and measured. According to the surface shape measurement results, the same element was processed with compensation manufacturing twice. The surface shape precision was obviously improved from PV = 2553nm and RMS = 481nm to PV = 214nm and RMS = 19.9nm, which verified the effectiveness of the method. A significant value was unfolded in the engineering application of this method.

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“…Ultra-precision machining technology is capable of achieving sub-micron-level shape accuracy and nanometer-level surface roughness precision, representing the highest level of manufacturing precision [15]. Ultra-precision machining technology can achieve the highprecision fabrication of functional surfaces with complex micro-and nanostructures [16].…”