Fig. 1. The correlation functions and are shown in (a) with different . The corresponding power spectra and are shown in (b). Here, are 0.5 and 0.227 mm, respectively.

Fig. 2. Analytical gain curves (lines) corresponding to different input intensities: (a) simulation results of the MI gain coefficient at different spatial coherence lengths when , , , , ; (b) simulation results of the MI gain coefficient at different spatial coherence lengths when , , , , .

Fig. 3. Variations in and B-integral with respect to different light densities and correlation functions.