Acousto-optical coherence tomography using random phase jumps on ultrasound and light.
Imaging objects embedded within highly scattering media by coupling light and ultrasounds (US) is a challenging approach. In deed, US enable direct access to the spatial localization, though resolution can be poor along their axis (cm). Up to now, several configurations have been studied, giving a millimetric axial resolution by applying to the US a microsecond pulse regime, as is the case with conventional echography. We introduce a new approach called Acousto-Optical Coherence Tomography (AOCT), enabling us to get a millimetric resolution with continuous US and light beams by applying random phase jumps on US and light. An experimental demonstration is performed with a self-adaptive holographic setup containing a photorefractive GaAs bulk crystal and a single large area photodetector.
Lesaffre
M
M
Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, Laboratoire d'Optique Physique, 10 rue Vauquelin F-75231 Paris Cedex 05.
Farahi
S
S
Gross
M
M
Delaye
P
P
Boccara
C
C
Ramaz
F
F
D000162:Acoustics / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018511:Systems Integration; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014463:Ultrasonography / Q000295:instrumentation*