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We present an “all-opticall” technique of broadband terahertz wave remote sensing by coherently manipulation of fluorescence from asymmetrically ionized gases. Coherent THz wave detection at a distance of 10 meters has been demonstrated.
We present recent results on experimental measurements and theoretical simulations for terahertz wave generation (quantum mechanical simulation) and detection (four-wave-mixing) with ambient air and selected gases. We demonstrate standoff terahertz wave generation for potential applications of terahertz air photonics in remote sensing and identification.
A device for phase and polarization control of omega (800 nm) and its second harmonic 2 omega (400 nm) beams is presented for intense THz generation from laser-induced gas plasma in gas cells. Long-term stability is achieved using an in-line design with a quartz wedge pair and alpha-BBO birefringent plates for phase control and a dual wavelength waveplate to align the polarization of omega and 2 omega...
Terahertz wave generation and detection using air as both the terahertz wave emitter and sensor media through nonlinear optical processes similar to four-wave mixing (named terahertz air photonics) were introduced. Due to the unique features of this technique, it is possible to find applications for terahertz air photonics in remote sensing and identification of explosives by sending optical beams...
Terahertz generation from gaseous media was further investigated by a gas jet system. The experimental results reveal that the terahertz radiation amplitude is correlated with the third order nonlinear susceptibility.
For standoff distance terahertz wave generation by mixing a 800 nm pulse and its second harmonic (400 nm) in air, a phase compensator, incorporated with a small-angle wedge pair, is used to pre-compensate the temporal walk-off between the 800 and 400 nm pulses due to the normal dispersion of the ambient air. With the phase compensator, we are able to generate intense terahertz waves by sending the...
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