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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 24 — Aug. 20, 2011
  • pp: 4769–4778

Laser differential confocal lens refractive index measurement

Weiqian Zhao, Yun Wang, Lirong Qiu, and Haorong Guo  »View Author Affiliations

Applied Optics, Vol. 50, Issue 24, pp. 4769-4778 (2011)

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A new laser differential confocal lens refractive index measurement is proposed, which uses the absolute zero of the differential confocal axial intensity curve to precisely identify the positions of the objective when the measurement pencil is focused on the vertex of the test lens and the reflector with or without the test lens in the measurement light-path, and then uses aberration compensation and ray tracing facet iterative calculation to obtain the refractive index of the test lens, thereby achieving the high-precision noncontact measurement of lens refractive index. The theoretical analyses and preliminary experiments indicate that the accuracy of the approach can reach about 2.5 × 10 4 .

© 2011 Optical Society of America

OCIS Codes
(080.3630) Geometric optics : Lenses
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(180.1790) Microscopy : Confocal microscopy
(220.4840) Optical design and fabrication : Testing
(290.3030) Scattering : Index measurements

Original Manuscript: February 8, 2011
Revised Manuscript: May 19, 2011
Manuscript Accepted: July 7, 2011
Published: August 15, 2011

Weiqian Zhao, Yun Wang, Lirong Qiu, and Haorong Guo, "Laser differential confocal lens refractive index measurement," Appl. Opt. 50, 4769-4778 (2011)

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