Real-time acousto-optic imaging using a high peak power long-pulsed illumination

François Fligliolia (1) , Qin Liu (2) , Sylvie Janicot (2) , Patrick Georges (2) , Gaëlle Lucas-Leclin (2) , Jean-Pierre Huignard (1) , Francois Ramaz (1) , Jean-Michel Tualle (3) , Maimouna Bocoum (1)

1 IL - Institut Langevin - Ondes et Images (UMR7587)
2 Laboratoire Charles Fabry / Lasers
3 LPL - Laboratoire de Physique des Lasers

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.

Mots clés: Coherent combining; acoustic-optic imaging; digital holographic detection

Domaines: Optique [physics.optics]; Optique / photonique

François Fligliolia, Qin Liu, Sylvie Janicot, Patrick Georges, Gaëlle Lucas-Leclin, et al.. Real-time acousto-optic imaging using a high peak power long-pulsed illumination. Optics Letters, inPress, ⟨10.1364/OL.528953⟩. ⟨hal-04718257⟩