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Temperature-dependent reflectivity measurements in the frequency range 85 -7000 cm$^{-1}$ were performed on BaFe$_2$As$_2$ single crystals under pressureup to $\sim$5 GPa. The corresponding pressure- and temperature-dependentoptical conductivity was analyzed with the Drude-Lorentz model to extract thecoherent and incoherent contributions. The gradual suppression of thespin-density wave (SDW) state with increasing pressure and the appearance ofthe superconducting phase coexisting with the SDW phase at 3.6~GPa wereobserved. At 3.6~GPa, the reflectivity reaches unity below $\sim$95~cm$^{-1}$indicating the opening of the superconducting gap and shows a full gap tendencyat 6 K.

Optical Study of BaFe$_2$As$_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity