The results of high-field terahertz transmission experiments on n-doped silicon (carrier concentration of $8.7times10^{16}$ cm$^{-3}$) are presented. We use terahertz pulses with electric field strengths up to 3.1 MV cm$^{-1}$ and a pulse duration of 700 fs. Huge transmittance enhancement of $sim$90 times is observed with increasing of the terahertz electric field strengths within the range of 1.5--3.1 MV cm$^{-1}$.
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