Real-time acousto-optic imaging using a high peak power long-pulsed illumination
Résumé
Acousto-optic imaging (AOI) of absorbing objects embedded in highly scattering media remains challenging since the detectable signal suitable for image reconstruction is weak. To increase the detected signals to a level required by live biological applications, we designed a high peak power quasi-continuous laser source based on the coherent combination of two pulsed amplifiers, delivering 100 µs-long pulses with a 9 W peak power at a 100 Hz repetition rate while maintaining an average power below 100 mW; jointly used with a digital holographic detection which maximises the amount of collected signal, we demonstrate for the first time the optical imaging of 2-cm-thick highly scattering media (µ ′ s ∼ 10 cm -1 ) at near video frame rate (0.2 Hz) using Fourier Transform-AOI.
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