An optical detection setup consisting of a focused laser beam fed into a downstream Fabry–Perot interferometer (FPI) for demodulation of acoustically generated optical phase variations is investigated for its applicability in photoacoustic tomography. The device measures the time derivative of acoustic signals integrated along the beam. Compared to a setup where the detection beam is part of a Mach–Zehnder interferometer, the signal-to-noise ratio of the FPI is lower, but the image quality of the two devices is similar. Using the FPI in a photoacoustic tomograph allows scanning the probe beam around the imaging object without moving the latter.
© 2011 Optical Society of America
Original Manuscript: December 16, 2010
Revised Manuscript: February 7, 2011
Manuscript Accepted: February 22, 2011
Published: March 14, 2011
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics
Robert Nuster, Hubert Gruen, Bernhard Reitinger, Peter Burgholzer, Sibylle Gratt, Klaus Passler, and Guenther Paltauf, "Downstream Fabry–Perot interferometer for acoustic wave monitoring in photoacoustic tomography," Opt. Lett. 36, 981-983 (2011)