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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5457–5465

Effect of manufacturing defects on optical performance of discontinuous freeform lenses

Kai Wang, Sheng Liu, Fei Chen, Zongyuan Liu, and Xiaobing Luo  »View Author Affiliations

Optics Express, Vol. 17, Issue 7, pp. 5457-5465 (2009)

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Discontinuous freeform lens based secondary optics are essential to LED illumination systems. Surface roughness and smooth transition between two discrete sub-surfaces are two of the most common manufacturing defects existing in discontinuous freeform lenses. The effects of these two manufacturing defects on the optical performance of two discontinuous freeform lenses were investigated by comparing the experimental results with the numerical simulation results based on Monte Carlo ray trace method. The results demonstrated that manufacturing defects induced surface roughness had small effect on the light output efficiency and the shape of light pattern of the PMMA lens but significantly affected the uniformity of light pattern, which declined from 0.644 to 0.313. The smooth transition surfaces with deviation angle more than 60 degrees existing in the BK7 glass lens, not only reduced the uniformity of light pattern, but also reduced the light output efficiency from 96.9% to 91.0% and heavily deformed the shape of the light pattern. Comparing with the surface roughness, the smooth transition surface had a much more adverse effect on the optical performance of discontinuous freeform lenses. Three methods were suggested to improve the illumination performance according to the analysis and discussion.

© 2009 Optical Society of America

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(220.4610) Optical design and fabrication : Optical fabrication
(230.3670) Optical devices : Light-emitting diodes
(080.4298) Geometric optics : Nonimaging optics

ToC Category:
Optical Design and Fabrication

Original Manuscript: October 31, 2008
Revised Manuscript: February 22, 2009
Manuscript Accepted: February 27, 2009
Published: March 23, 2009

Kai Wang, Sheng Liu, Fei Chen, Zongyuan Liu, and Xiaobing Luo, "Effect of manufacturing defects on optical performance of discontinuous freeform lenses," Opt. Express 17, 5457-5465 (2009)

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