Fig. 2.

Experimental setup used by Kong and coworkers [52] to demonstrate optical wavefront shaping with a deformable mirror (DM) through a scattering media with photoacoustic feedback. A glass slide covered with absorbing graphite particles was placed behind the scattering layer, and a high frequency ultrasound transducer (UT) was focused on the absorbing slide to measure the photoacoustic signal from its focal region. The photoacoustic signal was used as a feedback signal for the optimization procedure driving the DM. The CCD camera was only used here to verify the light intensity distribution on the absorbing layer after the optimization. Figure reproduced with permission from [52], 2011 OSA.