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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15323–15334

Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures

Woo-Deok Joo, Seungman Kim, Jiyong Park, Keunwoo Lee, Joohyung Lee, Seungchul Kim, Young-Jin Kim, and Seung-Woo Kim  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15323-15334 (2013)

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Fast, precise 3-D measurement of discontinuous step-structures fabricated on microelectronic products is essential for quality assurance of semiconductor chips, flat panel displays, and photovoltaic cells. Optical surface profilers of low-coherence interferometry have long been used for the purpose, but the vertical scanning range and speed are limited by the micro-actuators available today. Besides, the lateral field-of-view extendable for a single measurement is restricted by the low spatial coherence of broadband light sources. Here, we cope with the limitations of the conventional low-coherence interferometer by exploiting unique characteristics of femtosecond laser pulses, i.e., low temporal but high spatial coherence. By scanning the pulse repetition rate with direct reference to the Rb atomic clock, step heights of ~69.6 μm are determined with a repeatability of 10.3 nm. The spatial coherence of femtosecond pulses provides a large field-of-view with superior visibility, allowing for a high volume measurement rate of ~24,000 mm3/s.

© 2013 OSA

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.7090) Lasers and laser optics : Ultrafast lasers

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 2, 2013
Revised Manuscript: June 12, 2013
Manuscript Accepted: June 13, 2013
Published: June 19, 2013

Woo-Deok Joo, Seungman Kim, Jiyong Park, Keunwoo Lee, Joohyung Lee, Seungchul Kim, Young-Jin Kim, and Seung-Woo Kim, "Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures," Opt. Express 21, 15323-15334 (2013)

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