Fig. 4.

( Media 1 ^{(850.7KB, MOV)} ) Simulating CW, fully-surrounding, phase-conjugated light impinging upon a scattering medium. The scattering medium consists of 22,222 non-absorbing, randomly-positioned, 5-μm-diameter dielectric cylinders closely packed within a circular region of 1160 μm diameter; the scattering mean free path is 6.86 μm, the optical thickness is 169, and the strength of disorder is 0.0619. The λ = 1 μm CW light is generated with the phase-conjugated, CW amplitude and phase of outgoing light recorded in the forward scenario. a) A ring-shaped, CW wavefront of light is generated periodically. b) At t = 1 ps, light propagates through the scattering medium via multiple scattering, c) At t = 1.5 ps, light converges at the center and then diverges outward. (d) A soft sink technique is employed to eliminate the outgoing light, leaving only the incoming light component. A zoomed-in view of (d) is shown in (e).