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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 9 — Mar. 21, 2005
  • pp: 1582–1590

Investigation of the influence of spatial coherence of a broad-area laser diode on the interference fringe system of a Mach-Zehnder interferometer for highly spatially resolved velocity measurements

Lars Büttner and Jürgen Czarske  »View Author Affiliations


Applied Optics, Vol. 44, Issue 9, pp. 1582-1590 (2005)
http://dx.doi.org/10.1364/AO.44.001582


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Abstract

Laser Doppler anemometry is a method for absolute velocity measurements that is based on a Mach-Zehnder interferometer arrangement and usually employs transverse fundamental-mode lasers. We employed inexpensive and powerful broad-area laser diodes and investigated ways in which an interference fringe system is influenced by the spatial coherence properties of a multimode beam. It was demonstrated that, owing to poor spatial coherence of the beam, interference is suppressed in the marginal regions of the intersection volume. Based on these results, a sensor for highly spatially resolved velocity measurements can be built. The inherent astigmatism of the broad-area diode is corrected by an arrangement of two crossed cylindrical lenses. An interference fringe system of length 200 µm and a relative variation in fringe-spacing of only 0.22% were demonstrated with light emitted from a broad-area laser diode with a 100 µm × 1 µm emitter size. Based on this principle a powerful, simple, and robust laser Doppler sensor has been achieved. Highly spatially resolved measurements of a boundary layer flow are presented.

© 2005 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry

Citation
Lars Büttner and Jürgen Czarske, "Investigation of the influence of spatial coherence of a broad-area laser diode on the interference fringe system of a Mach-Zehnder interferometer for highly spatially resolved velocity measurements," Appl. Opt. 44, 1582-1590 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-9-1582


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References

  1. L. E. Drain, The Laser Doppler Technique (Wiley, New York, 1980).
  2. H. Albrecht, M. Borys, N. Damaschke, and C. Tropea, Laser-Doppler and Phase-Doppler Measurement Techniques (Springer-Verlag, Berlin, 2003).
  3. L. Büttner, "Untersuchung neuartiger Laser-Doppler-Verfahren zur hochauflösenden Geschwindigkeitsmessung," Ph.D. dissertation (University of Hanover, Göttingen, Germany, 2004).
  4. S. Hanson, "Broadening of the measured frequency spectrum in a differential laser anemometer due to interference plane gradients," Appl. Phys. 6, 164-171 (1973).
  5. P. Miles and P. Witze, "Evaluation of the Gaussian beam model for prediction of LDV fringe fields," presented at the Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 8-11 July, 1996.
  6. L. Büttner and J. Czarske, "A multimode-fibre laser-Doppler anemometer for highly spatially resolved velocity measurements using low-coherence light," Meas. Sci. Technol. 12, 1891-1903 (2001).
  7. L. Büttner and J. Czarske, "Multimode laser Doppler anemometer for turbulence measurements with high spatial resolution," presented at the 4th American Society of Mechanical Engineers/Japan Society of Mechanical Engineers Joint Fluids Engineering Conference, Honolulu, Hawaii, 6-11 July 2003.
  8. L. Büttner and J. Czarske, "Multimode fibre laser Doppler anemometer (LDA) with high spatial resolution for the investigation of boundary layers," Exp. Fluids 36, 214-216 (2004).
  9. M. Haag and M. Brandner, "Diode lasers--an innovative tool for production," p. 36, LaserOpto 03/2000; http://www.photonik.de/.
  10. P. Peuser and N. P. Schmitt, Diodengepumpte Festkörperlaser (Springer-Verlag, Berlin, 1995).
  11. B. E. A. Saleh and M. C. Teich, Fundamentals of Photonics (Wiley, New York, 1991).
  12. J. Czarske, L. Büttner, T. Razik, and H. Müller, "Boundary layer velocity measurements by a laser Doppler profile sensor with micrometre spatial resolution," Meas. Sci. Technol. 13, 1979-1989 (2002).
  13. P. C. Miles and P. O. Witze, "Fringe field quantification in an LDV probe volume by use of a magnified image," Exp. Fluids 16, 330-335 (1994).
  14. E. B. Li and A. K. Tieu, "Analysis of the three-dimensional fringe pattern formed by the interference of ideal and astigmatic Gaussian beams," presented at the Ninth International Int. Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 13-16 July, 1998.
  15. Linos Photonics, Göttingen/Germany, product catalog http://www.linos-photonics.com/, (2003).
  16. H. Schlichting, Boundary Layer Theory (McGraw-Hill, New York, 1987).

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