Non-invasive and noise-robust confocal wavefront shaping

Wavefront shaping attempts to image deep inside scattering tissue by modulating the incoming and/or outgoing wavefronts. Previously such modulations were estimated using non-linear two photon fluorescent feedback. Alternatively, to use a simpler linear fluorescent feedback, strong fluorescent beads are manually added to the tissue. However, the fluorescent components of a tissue are order-of-magnitude weaker than such beads, and the feedback signal required for previous algorithms cannot be detected. We suggest a new, noise robust approach, which works with a confocal modulation of both the illumination and imaging arms. We successfully use it to image EGFP labeled neurons through scattering tissue.