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International Journal of Thermophysics

, Volume 34, Issue 8–9, pp 1777–1784 | Cite as

Enhanced Photoacoustic Beam Profiling of Pulsed Lasers

  • M. González
  • G. Santiago
  • M. Paz
  • V. Slezak
  • A. Peuriot
Article
  • 94 Downloads

Abstract

An improved version of a photoacoustic beam profiler of pulsed lasers is presented. The new model resorts to high-bandwidth condenser microphones to register higher-order, excited acoustic modes, thus enabling more accurate profiling. In addition, Xe was used as a buffer gas since its high atomic weight further reduces the eigenfrequencies. Furthermore, a new gas-handling system makes up for some deficiencies found in the first model. The system was calibrated using the Airy pattern generated with a pinhole illuminated by a frequency-doubled Nd:YAG laser that excited \(\text{ NO }_{2}\) traces. Once calibrated, the beam profile of a TEA \(\text{ CO }_{2}\) laser was obtained, using ethylene as the absorbing species. This profiler returns more accurate profiles than thermal paper.

Keywords

Laser beam profiling Pulsed photoacoustics Acoustic modes 

Notes

Acknowledgments

This work was supported by the University of Buenos Aires through the grantUBACYT 20020090100136. We would like to thank Daniel Sinnewald for his help with the low-noise current-to-voltage-converters and José Luque for his expertise on mechanical matters.

References

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • M. González
    • 1
  • G. Santiago
    • 1
  • M. Paz
    • 1
  • V. Slezak
    • 2
  • A. Peuriot
    • 2
  1. 1.Laboratorio Láser, Facultad de IngenieríaUniversidad de Buenos AiresBuenos AiresArgentina
  2. 2.Centro de Investigaciones en Láseres y Aplicaciones CITEDEFBuenos AiresArgentina

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