Noncontact photoacoustic imaging based on all-fiber heterodyne interferometer

Seong Jun Park, Jonghyun Eom, Yong Ho Kim, Chang Su Lee, Byeong Ha Lee
Optics Letters 2014 August 15, 39 (16): 4903-6
We report on a noncontact photoacoustic imaging system utilizing an all-fiber-optic heterodyne interferometer as an acoustic wave detector. The acoustic wave generated by a short laser pulse via the photoacoustic effect and arriving at the sample surface could be detected with the fiber-optic heterodyne interferometer without physical contact or using an impedance matching medium. A phantom experiment was conducted to evaluate the proposed system, and the initial acoustic pressure distribution was calculated using a Fourier-based reconstruction algorithm. It is expected that the all-fiber-optic configuration of the proposed system can be applied as a minimally invasive diagnostic tool.

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