Strategy of restraining ripple error on surface for optical fabrication

Wang, Tan; Cheng, Haobo; Feng, Yunpeng; Tam, Hwa Yaw

doi:10.1364/ao.53.006058

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…Power Spectral Density (PSD) character curves have been proposed to evaluate the errors of different frequency ranges [5]. Surface profile error and surface roughness are primarily compensated for by modifying the dwell time of optimization [6,7] and the convolution of the removal function, which are strongly related to the polishing strategy [8,9]; even the most difficult processing issues of edge mis-figure can be controlled [10,11]. Researchers have conducted comprehensive studies on this topic, and suggested that the surface profile error can be diminished through small-tool polishing [12], magneto-rheological finishing [13][14][15], and stressed lap polishing [16].…”

Section: Introductionmentioning

confidence: 99%

Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Zha

Zhang

et al. 2020

Materials

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This study proposes two path generation algorithms to diminish the superposition of the convolution effect on the polishing path in computer-controlled optical surfacing. According to the polishing of aluminum-alloy based hyperboloid optical components, different proportions of polishing agents were blended. Then, the surface roughness of the optical components were determined through a validation experiment of the algorithms. Furthermore, the relationship between surface roughness and the polishing agent concentration, and the compensation strategies for surface roughness were analyzed. The results show that the two algorithms effectively compensated for surface waviness. The findings support the strategies for improving the surface quality of optical components with aspherical surfaces.

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Section: Introductionmentioning

confidence: 99%

Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Zha

Zhang

et al. 2020

Materials

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Overview on surface representations for freeform surfaces

et al. 2015

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Freeform surfaces are a new and exciting opportunity in lens design. The technological boundary conditions for manufacturing surfaces with reduced symmetry are complicated. Recently the progress in understanding and controlling this kind of components is ready for use in commercial products. Nearly all procedures of classical design development are changing, if freeform surfaces are used. The mathematical description of the surfaces, the optimization algorithms in lens design and their convergence, the initial design approaches, the evaluation of performance over the field of view, the data transfer in the mechanical design software and in the manufacturing machines, the metrology for characterization of real surfaces and the return of the real surfaces into the simulation are affected. In this contribution, in particular an overview on possible mathematical formulations of the surfaces is given. One of the requirements on the descriptions is a good performance to correct optical aberrations. After fabrication of real surfaces, there are typical deviations seen in the shape. First more localized deformations are observed, which are only poorly described by mode expansions. Therefore a need in describing the surface with localized finite support exists. Secondly the classical diamond turning grinding process typically shows a regular ripple structure. These midfrequency errors are best described by special approaches. For all these cases it would be the best to have simple, robust solutions, that allow for fast calculation in fitting measured surfaces and in raytrace

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Controlling mid-spatial frequency errors in magnetorheological jet polishing with a simple vertical model

et al. 2015

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Mid-spatial frequency (MSF) errors are always produced in magnetorheological jet polishing (MJP) with a simple vertical jetting model and require a control during the process. The relation between a surface with MSF errors and power spectral density is analyzed. Based on this, various concepts and methods are developed to restrain the MSF errors in MJP. With a cut-off frequency, the appropriate removal function is adopted. In addition, a dedicated path with uniform characteristics is designed for polishing. The weighted iterative algorithm is proposed to get a continuous and effective dwell time map. The duplication ratio is utilized to increase the nonuniformity of the surface. The experiments are deployed in a MJP run. The peak-to-valley and root mean square of the surface are reduced from 0.384λ and 0.077λ (λ=632.8 nm), respectively to 0.054λ and 0.007λ, respectively, and the smooth PSD curves are produced with low and smooth distribution.

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Strategy of restraining ripple error on surface for optical fabrication

Cited by 7 publications

References 31 publications

Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Overview on surface representations for freeform surfaces

Controlling mid-spatial frequency errors in magnetorheological jet polishing with a simple vertical model

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