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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 22 — Aug. 1, 2006
  • pp: 5607–5613

Phase-stepped gauge block interferometry using a frequency-tunable visible laser diode

Michael O'Hora, Brian Bowe, and Vincent Toal  »View Author Affiliations


Applied Optics, Vol. 45, Issue 22, pp. 5607-5613 (2006)
http://dx.doi.org/10.1364/AO.45.005607


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Abstract

Frequency changes induced by bias or temperature modulation of injection diode lasers can provide an economical and effective method of applying phase-stepping interferometry to optical metrology. However, the intrinsic frequency instability of these devices limits their use in gauge block interferometry where precise and repeatable phase steps must be maintained simultaneously on two discontinuous surfaces and over relatively long path lengths. We demonstrate a method using a visible injection diode laser, the frequency of which is locked by using a Fabry–Perot interferometer. Small changes to the length of the Fabry–Perot interferometer shift the frequency of the laser producing proportional and repeatable phase steps to the gauge block interferogram. This method has been successfully implemented with a Fizeau-type gauge block interferometer with a phase measurement resolution of 0.005 λ . The phase data are then processed to map the surface form of gauge blocks up to 100   mm in length and to objectively assess surface shape parameters.

© 2006 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(140.2020) Lasers and laser optics : Diode lasers

ToC Category:
Interferometry

History
Original Manuscript: September 20, 2005
Manuscript Accepted: December 19, 2005

Citation
Michael O'Hora, Brian Bowe, and Vincent Toal, "Phase-stepped gauge block interferometry using a frequency-tunable visible laser diode," Appl. Opt. 45, 5607-5613 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-22-5607


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References

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