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Enhanced Photoacoustic Beam Profiling of Pulsed Lasers

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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.

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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.

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Authors and Affiliations

  1. Laboratorio Láser, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 , Buenos Aires, Argentina

    M. González, G. Santiago & M. Paz

  2. Centro de Investigaciones en Láseres y Aplicaciones CITEDEF, J. B. Lasalle 4397, 1603 , Buenos Aires, Argentina

    V. Slezak & A. Peuriot

Authors
  1. M. González
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  2. G. Santiago
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  3. M. Paz
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  4. V. Slezak
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  5. A. Peuriot
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Corresponding author

Correspondence to G. Santiago.

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González, M., Santiago, G., Paz, M. et al. Enhanced Photoacoustic Beam Profiling of Pulsed Lasers. Int J Thermophys 34, 1777–1784 (2013). https://doi.org/10.1007/s10765-013-1437-8

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  • DOI: https://doi.org/10.1007/s10765-013-1437-8

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