Experimental and numerical study of Conoscopic Interferometry sensitivity for optimal acoustic pulse detection in ultrafast acoustics

Martin Robin*, Ruben Guis, Mustafa Umit Arabul, Zili Zhou, Nitesh Pandey, Gerard J. Verbiest*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Conoscopic interferometry is a promising detection technique for ultrafast acoustics. By focusing a probe beam through a birefringent crystal before passing it through a polarizer, conoscopic interferences sculpt the spatial profile of the beam. The use of these patterns for acoustic wave detection revealed a higher detection sensitivity over existing techniques, such as reflectometry and beam distortion detection. However, the physical origin of the increased sensitivity is unknown. In this work, we present a model, describing the sensitivity behavior of conoscopic interferometry with respect to the quarter-wave plate orientation and the diaphragm aperture, which is validated experimentally. Using the model, we optimize the detection sensitivity of conoscopic interferometry. We obtain a maximal sensitivity of detection when placing the diaphragm edge on the dark fringes of the conoscopic interference patterns. In the configurations studied in this work, conoscopic interferometry can be 18 dB more sensitive to acoustic waves than beam distortion detection.

Original languageEnglish
Article number100470
Number of pages10
JournalPhotoacoustics
Volume30
DOIs
Publication statusPublished - 2023

Keywords

  • Acoustic waves detection
  • Beam distortion detection
  • Conoscopic interferometry
  • Picosecond ultrasonics
  • Reflectometry

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