Fig. 2.

Schematic illustrations of conceptual experiments that find and utilize the optimal wavefronts for WS-OCT. (a) A focused Gaussian beam is launched toward the surface from the target depth. The beam propagates through the turbid medium and is collected outside the sample surface. (b) Optimal wavefronts for WS-OCT, obtained by conjugating the phase of the collected beam, is launched into the turbid medium and form a desired focused spot at the target location. (c) The back-scattered light is collected outside the sample to be used for coherence tomography. This becomes the model case against which realistic WS-OCTs can be compared.