Abstract
The excited state nonlinearity and optical limiting behaviors of cubane-like shaped clusters [WSe 4(MPPh 3) 3Cl (M=Ag, Cu)] in DMF solution were studied by using a picosecond laser pulses. The excited state absorption capability of clusters [WSe 4(AgPPh 3) 3Cl] is obviously stronger than that of clusters [WSe 4(CuPPh 3) 3Cl]. Influences of skeletal atoms on excited state absorption are significant. The fluence-dependent model was used to describe the optical limiting phenomena, and the ratio of absorption cross-section of the excited state to that of the ground state of clusters [WSe 4(AgPPh 3) 3Cl] is two times greater than that of fullerene.
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