Wavelength-multiplexing ghost imaging

A wavelength-multiplexing ghost-imaging (WMGI) technique is performed in order to improve long data acquisition time in conventional ghost imaging. In WMGI, a source has more than two colored light beams which are independently modulated and projected onto an object at the same time. Then the reflected light from the object is recorded with wavelength-selected detectors. We analyze the contrast-to-noise ratio (CNR) of the reconstructed images of each single-wavelength ghost imaging and their superposition and demonstrate the validity of the WMGI technique.

Figure 1

Experimental setup. The digital light projector is used to produce three-color random patterns which illuminate the object, and the reflected signals from the object are captured by three color-selective photodetectors. B: lamb. $D_1,D_2$, and $D$: dichromatic mirrors. $M_1,M_2,$ and $M_3$: mirrors. $L_1,L_2$, and $L_3$: LCDs.

Figure 2

Typical random illumination patterns output from projector. (a) Red light, (b) green light, (c) blue light, and (d) RGB light.

Figure 3

Experimental results of WMGI. $\left(\mathrm{a}i\right)–\left(\mathrm{d}i\right) \left(i=1–3\right)$ correspond to the reconstructed GIs with $N=500$, 1000, 1500, and 3000, respectively. The columns from left to right correspond to GIs reconstructed with red, green, and blue light beams and WMGI, respectively.