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We report on the emission of terahertz radiation by irradiation offemtosecond laser pulses in non-centrosymmetric paraelectric and ferroelectricphases of Co$_3$B$_7$O$_{13}$I boracite. The Generation of the terahertz wavesin both phases is caused by optical rectification via a second-order nonlinearoptical effect. In the ferroelectric phase, we successfully visualizedferroelectric domains by analyzing the polarization state of the terahertz waveradiated from the crystal. In a large area of the crystal ($\sim$ 500 $\times$500 $\mu$m$^2$), the observed polarization vector of the radiated terahertzwave was tilted from directions of spontaneous polarization, i.e., [100]$_{\rmcub}$, [010]$_{\rm cub}$, and [001]$_{\rm cub}$ in cubic setting, which can beexplained by the presence of a ferroelectric 90$^\circ$ domain wall of the(101)$_{\rm cub}$ plane.

Visualization of ferroelectric domains in boracite using emission of terahertz radiation