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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 17 — Sep. 1, 2010
  • pp: 2946–2948

Effects of phosphor-based LEDs on vertical scanning interferometry

Wee Keat Chong, Xiang Li, and Sardha Wijesoma  »View Author Affiliations

Optics Letters, Vol. 35, Issue 17, pp. 2946-2948 (2010)

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High-power phosphor-based LEDs are replacing conventional white-light sources for vertical scanning interferometry, but the spectrum of the phosphor-based LED is different from that of the conventional light source. The phosphor-based LED has two peaks in its spectrum, while the conventional light source has only one peak in the Gaussian distribution. In this Letter, we investigate the effects of phosphor-based LEDs on vertical scanning interferometry. Our result shows that the use of a phosphor-based LED changes the fringe contrast function significantly, such that measurement repeatability decreases. We propose and demonstrate that a constraint on the input to the existing reconstruction algorithm improves the repeatability of the vertical scanning interferometer with a phosphor-based LED.

© 2010 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 15, 2010
Revised Manuscript: July 19, 2010
Manuscript Accepted: August 6, 2010
Published: August 25, 2010

Wee Keat Chong, Xiang Li, and Sardha Wijesoma, "Effects of phosphor-based LEDs on vertical scanning interferometry," Opt. Lett. 35, 2946-2948 (2010)

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