Fig. 6: Single-shot UFP optical focusing into scattering media.
From: Focusing light into scattering media with ultrasound-induced field perturbation
a Time sequence for the single-shot realization of UFP optical focusing. b In general interferometers, if a light beam with a spherical wavefront interferes with a plane reference beam, a typical interferogram with many circular fringes will be seen. c In our system, because the phases of the reference beam were reversed during the first and the second halves of the camera exposure period, the interference terms canceled out completely, resulting in no interference fringes. d Phase map generated from the recorded single hologram. e Time-reversed focus from single-shot UFP optical focusing. f A control experiment without launching the ultrasound, yielding no focus. g Line profiles of the central rows in e and f. Scale bar: 1 mm
