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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 26027–26036

Laser differential reflection-confocal focal-length measurement

Jiamiao Yang, Lirong Qiu, Weiqian Zhao, and Hualing Wu  »View Author Affiliations

Optics Express, Vol. 20, Issue 23, pp. 26027-26036 (2012)

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A new laser differential reflection-confocal focal-length measurement (DRCFM) method is proposed for the high-accuracy measurement of the lens focal length. DRCFM uses weak light reflected from the lens last surface to determine the vertex position of this surface. Differential confocal technology is then used to identify precisely the lens focus and vertex of the lens last surface, thereby enabling the precise measurement of the lens focal length. Compared with existing measurement methods, DRCFM has high accuracy and strong anti-interference capability. Theoretical analyses and experimental results indicate that the DRCFM relative measurement error is less than 10 ppm.

© 2012 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(180.1790) Microscopy : Confocal microscopy
(220.4840) Optical design and fabrication : Testing

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 24, 2012
Revised Manuscript: October 16, 2012
Manuscript Accepted: October 23, 2012
Published: November 2, 2012

Jiamiao Yang, Lirong Qiu, Weiqian Zhao, and Hualing Wu, "Laser differential reflection-confocal focal-length measurement," Opt. Express 20, 26027-26036 (2012)

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  1. E. Keren, K. M. Kreske, and O. Kafri, “Universal method for determining the focal length of optical systems by moire deflectometry,” Appl. Opt.27(8), 1383–1385 (1988). [CrossRef] [PubMed]
  2. C.-W. Chang and D.-C. Su, “An improved technique of measuring the focal length of a lens,” Opt. Commun.73(4), 257–262 (1989). [CrossRef]
  3. P. Singh, M. S. Faridi, C. Shakher, and R. S. Sirohi, “Measurement of focal length with phase-shifting Talbot interferometry,” Appl. Opt.44(9), 1572–1576 (2005). [CrossRef] [PubMed]
  4. K. V. Sriram, M. P. Kothiyal, and R. S. Sirohi, “Direct determination of focal length by using Talbot interferometry,” Appl. Opt.31(28), 5984–5987 (1992). [CrossRef] [PubMed]
  5. F. Lei and L. K. Dang, “Measuring the focal length of optical systems by grating shearing interferometry,” Appl. Opt.33(28), 6603–6608 (1994). [CrossRef] [PubMed]
  6. M. Thakur and C. Shakher, “Evaluation of the focal distance of lenses by white-light Lau phase interferometry,” Appl. Opt.41(10), 1841–1845 (2002). [CrossRef] [PubMed]
  7. C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun.248(4-6), 339–345 (2005). [CrossRef]
  8. S. Zhao, J. F. Wen, and P. S. Chung, “Simple focal-length measurement technique with a circular Dammann grating,” Appl. Opt.46(1), 44–49 (2007). [CrossRef] [PubMed]
  9. Y. P. Kumar and S. Chatterjee, “Technique for the focal-length measurement of positive lenses using Fizeau interferometry,” Appl. Opt.48(4), 730–736 (2009). [CrossRef] [PubMed]
  10. Y. Xiang, “Focus retrocollimated interferometry for focal-length measurements,” Appl. Opt.41(19), 3886–3889 (2002). [CrossRef] [PubMed]
  11. I. K. Ilev, “Simple fiber-optic autocollimation method for determining the focal lengths of optical elements,” Opt. Lett.20(6), 527–529 (1995). [CrossRef] [PubMed]
  12. D.-H. Kim, D. Shi, and I. K. Ilev, “Alternative method for measuring effective focal length of lenses using the front and back surface reflections from a reference plate,” Appl. Opt.50(26), 5163–5168 (2011). [CrossRef] [PubMed]
  13. J.- Wu, J.- Chen, A.- Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann-Shack principle,” Optik (Stuttg.)123(6), 485–488 (2012). [CrossRef]
  14. J. Wu, J. Chen, A. Xu, and X. Gao, “Uncollimated light beam illumination during the ocular aberration detection and its impact on the measurement accuracy by using Hartmann-Shack wavefront sensor,” Proc. SPIE7508, 75080V, 75080V-12 (2009). [CrossRef]
  15. T. G. Parham, T. J. McCarville, and M. A. Johnson, “Focal length measurements for the National Ignition Facility large lenses,” Optical Fabrication and Testing (OFT 2002), paper: OWD8.
  16. W. Zhao, R. Sun, L. Qiu, and D. Sha, “Laser differential confocal ultra-long focal length measurement,” Opt. Express17(22), 20051–20062 (2009). [CrossRef] [PubMed]
  17. W. Zhao, J. Tan, and L. Qiu, “Bipolar absolute differential confocal approach to higher spatial resolution,” Opt. Express12(21), 5013–5021 (2004). [CrossRef] [PubMed]

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