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Full-field imaging through scattering media is fraught with many challenges.Despite many achievements in recent years, current imaging methods are too slowto deal with fast dynamics that occur for example in biomedical imaging. Herewe present an ultra-fast all-optical method, where the object to be imaged andthe scattering medium (diffuser) are inserted into a highly multimodeself-imaging laser cavity. We show that the intra-cavity laser light from theobject is mainly focused onto specific regions of the scattering medium wherethe phase variations are low. Thus, round trip loss within the laser cavity isminimized, thereby overcoming most of the scattering effects. The method isexploited to image objects through scattering media whose diffusion angle islower than the numerical aperture of the laser cavity. As our method is basedon optical feedback inside a laser cavity, it can deal with temporal variationsthat occur on timescales as short as several cavity round trips, with an upperbound of 200 ns.

Real-time full-field imaging through scattering media by all-optical feedback