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In general, the typical approach to discriminate antibunching, bunching orsuperbunching categories make use of calculating the second-order coherencefunction ${g^{(2)}}(\tau )$ of light. Although the classical light sourcescorrespond to the specific degree of second-order coherence ${g^{(2)}}(0)$, itdoes not alone constitute a distinguishable metric to characterize anddetermine light sources. Here we propose a new mechanism to directly classifyand generate antibunching, bunching or superbunching categories of light, aswell as the classical light sources such as thermal and coherent light, byGamma fitting according to only one characteristic parameter $\alpha$ or$\beta$. Experimental verification of beams from four-wave mixing process is inagreement with the presented mechanism, and the in fluence of temperature $T$and laser detuning $\Delta$ on the measured results are investigated. Theproposal demonstrates the potential of classifying and identifying light withdifferent nature, and the most importantly, provides a convenient and simplemethod to generate light sources meeting various application requirementsaccording to the presented rules. Most notably, the bunching and superbunchingare distinguishable in super-Poissonian statistics using our mechanism.

Classification and Generation of Light Sources Using Gamma Fitting