Free beam Fabry-Perot-interferometer as detector for photoacoustic tomography

Sibylle Gratt; Gerhild Wurzinger; Robert Nuster; Guenther Paltauf

doi:10.1117/12.2032964

14 June 2013 Free beam Fabry-Perot-interferometer as detector for photoacoustic tomography

Sibylle Gratt, Gerhild Wurzinger, Robert Nuster, Guenther Paltauf

Proceedings Volume 8800, Opto-Acoustic Methods and Applications; 880002 (2013) https://doi.org/10.1117/12.2032964
Event: European Conferences on Biomedical Optics, 2013, Munich, Germany

Abstract

Acoustic line detectors have been shown to be capable of providing accurate signals for three-dimensional photoacoustic tomography. Free and guided beam optical Mach-Zehnder interferometers (MZI) have been used as well as a waveguide Fabry-Perot interferometer (FPI). The ultimate sensitivity is expected from a FPI where the optical field in the resonator propagates in the acoustic coupling medium (water) surrounding the imaged object. Such a free-beam FPI is completely optically and acoustically transparent, while providing a higher sensitivity compared to the MZI due to the multiple beam interference. In this work the performance of a FPI for measurement of ultrasound waves is compared to a MZI. It is shown that an at least 4.5-fold higher signal to noise ratio is achieved compared to a MZI. The resolution of the FPI is simulated and measured, showing a constant diameter of the interferometer beam. Verification of the stability of the free beam FPI over longer time periods is demonstrated by acquiring a two-dimensional tomography image of a phantom. The sensitivity and stability of the setup makes it suitable for tomographic imaging.

Citation Download Citation

Sibylle Gratt, Gerhild Wurzinger, Robert Nuster, and Guenther Paltauf "Free beam Fabry-Perot-interferometer as detector for photoacoustic tomography", Proc. SPIE 8800, Opto-Acoustic Methods and Applications, 880002 (14 June 2013); https://doi.org/10.1117/12.2032964

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