Fast interrogation wavelength tuning for all-optical photoacoustic imaging

Jérémy Saucourt; Antonin Moreau; Julien Lumeau; Hervé Rigneault; Thomas Chaigne

doi:10.1117/12.2670115

11 August 2023 Fast interrogation wavelength tuning for all-optical photoacoustic imaging

Jérémy Saucourt, Antonin Moreau, Julien Lumeau, Hervé Rigneault, Thomas Chaigne

Proceedings Volume 12631, Opto-Acoustic Methods and Applications in Biophotonics VI; 126310L (2023) https://doi.org/10.1117/12.2670115
Event: European Conferences on Biomedical Optics, 2023, Munich, Germany

Abstract

One of the most widespread all-optical photoacoustic imaging techniques is based on Fabry-Pérot cavities with a thin polymer spacer. However, the deposition process can lead to inhomogeneities in the thickness of this sensing layer. They can be compensated by precisely controlling the interrogation beam, to provide optimal sensitivity. This is commonly achieved with slowly tunable narrowband lasers, eventually limiting the acquisition speed. We propose instead to use a broadband amplified spontaneous emission source and a fast tunable acousto-optic filter to adjust the interrogation wavelength at each pixel within a few microseconds. This enables us to maximize the sensitivity of the optical interferometric ultrasound detection at each point of the Fabry-Perot cavity. We experimentally show that this greatly enhances the detection bandwidth of the ultrasound sensors. We demonstrate the validity of this approach by performing photoacoustic imaging with a highly inhomogeneous sensor.

Citation Download Citation

Jérémy Saucourt, Antonin Moreau, Julien Lumeau, Hervé Rigneault, and Thomas Chaigne "Fast interrogation wavelength tuning for all-optical photoacoustic imaging", Proc. SPIE 12631, Opto-Acoustic Methods and Applications in Biophotonics VI, 126310L (11 August 2023); https://doi.org/10.1117/12.2670115

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