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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 25 — Sep. 1, 2000
  • pp: 4589–4592

Sinusoidal wavelength-scanning interferometer with a superluminescent diode for step-profile measurement

Osami Sasaki, Norihiko Murata, and Takamasa Suzuki  »View Author Affiliations


Applied Optics, Vol. 39, Issue 25, pp. 4589-4592 (2000)
http://dx.doi.org/10.1364/AO.39.004589


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Abstract

In sinusoidal phase-modulating interferometry an optical path length (OPD) larger than a wavelength is measured by detection of sinusoidal phase-modulation amplitude Z b of the interference signal that is produced by sinusoidal scanning of the wavelength of a light source. A light source with a large scanning width of wavelength is created by use of a superluminescent laser diode for the error in the measured value obtained by Z b to be smaller than half of the central wavelength. In this situation the measured value can be combined with a fractional value of the OPD obtained from the conventional phase of the interference signal. A sinusoidal wavelength-scanning interferometer with the light source measures an OPD over a few tens of micrometers with a high accuracy of a few nanometers.

© 2000 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

History
Original Manuscript: November 15, 1999
Revised Manuscript: March 7, 2000
Published: September 1, 2000

Citation
Osami Sasaki, Norihiko Murata, and Takamasa Suzuki, "Sinusoidal wavelength-scanning interferometer with a superluminescent diode for step-profile measurement," Appl. Opt. 39, 4589-4592 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-25-4589


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