Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66911
Title: A novel evaluation and compensation method for ultra-precision machining of hybrid lens
Authors: Li, LH
Chan, CY
Lee, WB 
Liu, YH
Keywords: Diffractive-refractive hybrid
Objective lens
Optical deviation
Ultra-precision machining
Issue Date: 2016
Publisher: Elsevier
Source: Precision engineering, Jan. 2016, v. 43, p. 10-23 How to cite?
Journal: Precision engineering 
Abstract: In this study, a diffractive-refractive hybrid objective lens (DHOL) compatible with multi-type optical discs (Blu-ray Disc (BD), China Blue High-Definition Disc (CBHD), DVD and CD) was designed and fabricated. The surface of the DHOL was an aspherical (refractive) substrate superimposed on a diffractive sub-structure, and by using ultra-precision single point diamond turning, the form error was reduced to be less than lambda/4. However, because of the finite dimensions of the tool radius (R), the pitch of the diffractive structure must be larger than R. This limits the performance of the DHOL and has a bigger effect on the diffractive performance than on the refractive performance. To counteract the limitation, a novel refractive compensation method is proposed. Through superimposing a small refractive curvature, a significant improvement in the diffractive performance was achieved. By reconstructing the wavefront aberration using Zernike expansion and taking the horizontal rotation angle, tool radius and usable cutting edge into account, an optimal design was determined. The optimal design was fabricated and found to perform satisfactorily.
URI: http://hdl.handle.net/10397/66911
ISSN: 0141-6359
DOI: 10.1016/j.precisioneng.2015.05.001
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page view(s)

21
Checked on Aug 13, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.