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Pseudothermal light by scattering laser light from rotating groundglass hasbeen extensively employed to study optical coherence in both classical andquantum optics ever since its invention in 1960s. In this paper, we will showthat by replacing the invariant intensity laser light in pseudothermal lightsource with intensity modulated laser light, superbunching pseudothermal lightcan be obtained. Two-photon interference in Feynman's path integral theory isemployed to interpret the phenomenon. Two-photon superbunching isexperimentally observed by employing common instruments in optical laboratory.The proposed superbunching pseudothermal light is helpful to understand thephysics of two-photon bunching and superbunching, and the difference betweenclassical and quantum interpretations of the second- and higher-orderinterference of light.

Superbunching pseudothermal light with intensity modulated laser light and rotating groundglass