Researching | Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression

Chinese Optics Letters, Volume. 15, Issue 11, 111201(2017)

Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression

Xisheng Xiao^1,2,3, Qinghua Yu^1,2、*, Zhentao Zhu^1,2,3, Kai Hu^1,2, and Guilin Chen^1,2

Author Affiliations

¹Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, Shanghai 200083, China

²Key Laboratory of Infrared System Detection and Imaging technology, Chinese Academy of Sciences, Shanghai 200083, China

³University of Chinese Academy of Sciences, Beijing 100049, China

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Fig. 1. CGH-encoding process. (a) Generating binary fringes using phase contour interferograms. (b) Encoding the fringes into polygons.

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Fig. 2. Deviations introduced by encoding.

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Fig. 3. Digitalization and non-maxima suppression processes.

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Fig. 4. Deviation induced by digitalizing the curve.

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Fig. 5. Deviation induced by non-maxima suppression.

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Fig. 6. Result of non-maxima suppression.

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Fig. 7. Statistics of the suppression errors.

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Fig. 8. Used self-aligned CGH to verify the encoding accuracy.

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Fig. 9. Layout of the CGH.

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Fig. 10. Substrate error.

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Fig. 11. Testing the reflecting wave-front generated by the CGH.

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Fig. 12. Experimental result.

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Table 1. Error Estimation
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Table 1. Error Estimation
CGH Errors Wave-front Phase $Error / λ$
Substrate error 0.024
Pattern distortion error $\sim 0.03$
Encoding error $< 0.02$
Whole path RSS error $< 0.041$
Single path RSS error $< 0.0205$

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Xisheng Xiao, Qinghua Yu, Zhentao Zhu, Kai Hu, Guilin Chen, "Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression," Chin.Opt.Lett. 15, 111201 (2017)

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Paper Information

Category: Instrumentation, measurement, and metrology

Received: Jun. 20, 2017

Accepted: Aug. 11, 2017

Published Online: Jul. 19, 2018

The Author Email: Qinghua Yu (yuqinghua2000@126.com)

DOI:10.3788/COL201715.111201

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology