Fig. 4.

(a) Experimental set-up. Light source: pulsed diode laser, operated at 690 nm with 80 MHz repetition rate. Detection: time-gated intensified CCD camera, gate width 1 ns, risetime 120 ps. The launching fiber is embedded into a black cylinder (1 cm radius) to shield the camera from early photons at short source-detector distances. (b) One raw image captured by the ICCD camera. The red rectangle shows the imaging region in X-Y plane for reconstruction. The black circle indicates the position of the black cylinder. The region enclosed by the black lines and the bottom line of the rectangle was removed to avoid influence of the optical fiber.