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Terahertz (THz) waves generated through four-wave mixing in laser-induced air plasmas are an ideal source for imaging arbitrary locations. Under an amplified laser beam, ionized ambient air as a mixing medium provides broadband pulses with an unprecedented THz electric field strength among all the optically induced THz waves from nonlinear materials. We report the use of plasma-induced THz waves for...
Terahertz (THz) radiation, which occupies a large portion of the electromagnetic spectrum between the infrared and microwave bands, offers innovative imaging and sensing technologies that can provide information, which is not available through conventional methods (i.e. microwave and X-ray techniques.) Recently, governmental supported THz wave related fundamental research in science and application...
THz radiation has been used to uncover small defects in samples of space shuttle foam. This nondestructive method could help NASA to examine the insulating foam that is applied to each shuttle's fuel tank prior to launch.
Fresnel lenses have a number of attractive properties for pulsed terahertz imaging. We demonstrate tomographic imaging with a Fresnel lens and report progress towards the goal of long range terahertz imaging.
We demonstrate three-dimensional terahertz (THz) holography with the use of the windowed Fourier transformation. The coherent nature of THz time domain spectroscopy allows measurement of the phase and amplitude of the THz wave for holographic imaging.
Two dimensional electro-optic sampling allows a target's scattered terahertz field to be measured. By obtaining multiple projection images we have performed the reconstruction of three dimensional targets with millimeter resolution.
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