Instrumentation, Techniques, and Measurement

Influence of low-spatial frequency ripples in machined potassium dihydrogen phosphate crystal surfaces on wavefront errors based on the wavelet method

[+] Author Affiliations
Wanqun Chen

Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China

Yazhou Sun

Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China

Opt. Eng. 54(2), 024101 (Feb 03, 2015). doi:10.1117/1.OE.54.2.024101
History: Received November 5, 2014; Accepted January 12, 2015
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Abstract.  In using a fly cutter to machine potassium dihydrogen phosphate (KDP) crystals, rippling in machined surfaces will remain that will have a significant impact on the optical performance. An analysis of these low-spatial frequency ripples is presented and its influence on the root-mean-squared gradient (GRMS) of the wavefront discussed. A frequency analysis of the machined KDP crystal surfaces is performed using wavelet transform and power spectral density methods. Based on a classification of the time frequencies for these macroripples, the multimode vibration of the machine tool is found to be the main reason surface ripples are produced. Improvements in the machine design parameters are proposed to limit such effects on the wavefront performance of the KDP crystal.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Wanqun Chen and Yazhou Sun
"Influence of low-spatial frequency ripples in machined potassium dihydrogen phosphate crystal surfaces on wavefront errors based on the wavelet method", Opt. Eng. 54(2), 024101 (Feb 03, 2015). ; http://dx.doi.org/10.1117/1.OE.54.2.024101


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