All-optical modulation by continuous wave light using two-color excited-state absorption at visible wavelengths

초록

We demonstrated all -optical modulation with a nonlinear medium, i.e., indigo carmine, an aromatic conjugated structure with delocalized pi-electrons, using non -high power continuous wave light for pump and probe of different visible wavelengths. Pump -induced probe transmission increase occurred through absorption saturation of probe light by pump -induced linear and nonlinear absorption including two-color excited -state absorption (ESA). The two-color ESA occurred only when both pump light and probe light co -propagated through a medium, leading to nearly pump power -independent increase in probe transmission for appropriately chosen wavelengths of pump and probe light, given the optical transition structure of electronic energy levels in the medium. (c) 2023 Optica Publishing Group

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