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We have measured the far infrared reflectance of the heavy fermion compoundURu$_2$Si$_2$ through the phase transition at T$_{HO}$=17.5 K dubbed 'hiddenorder' with light polarized along both the a- and c-axes of the tetragonalstructure. The optical conductivity allows the formation of the hidden ordergap to be investigated in detail. We find that both the conductivity and thegap structure are anisotropic, and that the c-axis conductivity shows evidencefor a double gap structure, with $\Delta_{1,c}=2.7$ meV and $\Delta_{2,c}=1.8$meV respectively at 4 K, while the gap seen in the a-axis conductivity has avalue of $\Delta_a=3.2$ meV at 4 K. The opening of the gaps does not follow thebehaviour expected from mean field theory in the vicinity of the transition.

Observation of Multiple-Gap Structure in Hidden Order State of URu2Si2 from Optical Conductivity