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We present detailed temperature dependent optical data onBaFe$_{2-x}$Co$_{x}$As$_{2}$ (BCFA), with x = 0.14, between 4 meV and 6.5 eV.We analyze our spectra to determine the main optical parameters and show thatin this material the interband conductivity already starts around 10 meV. Wedetermine the superfluid density to be 2.2 10^{7}$ cm^{-2}, which placesoptimally doped BFCA close to the Uemura line. Our experimental data showsclear signs of a superconducting gap with 2$\Delta_{1}$ = 6.2 $\pm$ 0.8 meV. Inaddition we show that the optical spectra are consistent with the presence ofan additional band of strongly scattered carriers with a larger gap,2$\Delta_{2}$ = 14 $\pm$ 2 meV.

Optical properties of BaFe$_{2-x}$Co$_x$As$_2$