Spatiotemporal Shaping of Terahertz Pulses

It has been demonstrated in a number of laboratories over the past several years that when a GaAs crystal is subject to a dc voltage bias and simultaneously illuminated by a fsec laser pulse whose photon energy exceeds the crystal's bandgap, a small antenna is formed that radiates a THz pulse. The pulse typically contains only a fraction of a cycle to a few cycles of oscillation. These pulses have found a variety of uses in ultrafast spectroscopy of atoms, molecules, and solids, far-infrared time-domain spectroscopy, study and control of Rydberg atoms, T-ray imaging of optically opaque materials, and impulse ranging studies.

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