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Liquid water is a strong absorber in THz range, making the presence of water a nuisance when collecting measurements within this frequency regime. Here, we experimentally demonstrate the generation of broadband THz waves from liquid water with a femtosecond laser. The signal is obtained when a high-intensity laser beam is focused within a water film. This THz signal is distinguished from the signal...
Laser-induced plasmas with longitudinal size smaller than 40 μm are investigated as a source of broadband terahertz (THz) radiation. The angular dependent emission of the micro-plasma is measured with coherent detection, and the preferential directions of radiation are identified. The observations support electrons drift driven by the laser ponderomotive force as the principal generation mechanism...
We study the polarization dependence of THz wave air-biased-coherent-detection. By changing the polarization state of fundamental beam and DC field, the polarization of the THz field induced second harmonic is measured.
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 used a commercial neon lamp to detect THz waves (0.1, 0.2, 0.37 THz), IR (800 nm) and UV light (200 ~ 400 nm). The amplified responsivities at 0.1 THz, 0.2 THz, and 0.37 THz are 150 V/W, 57.5 V/W and 19.3 V/W, respectively.
We report here, for the first time, on enhanced nonresonant detection of terahertz radiation using multiple InGaAs/GaAs high-electron-mobility transistors (HEMTs) connected in series and biased by a direct drain current. A 1.63 THz (184 mum) response is proportional to the number of detecting transistors operating in saturation region at the same gate-source bias voltage. The experimental data are...
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.
A terahertz time-domain system with continuous bandwidth extending from millimetre wave through the mid-infrared is demonstrated using ionising air as the generation and detection medium. The measurements indicate that the bandwidth of such systems is constrained only by the optical pulse duration utilised. With use of a 25 fs pulse duration laser, a continuous bandwidth reaching 40 THz is demonstrated.
We report the first demonstration of both incoherent and coherent detection of pulsed terahertz waves using ambient air or laser-induced air plasma as the sensor through a third-order nonlinear optical process with femtosecond laser pulses.
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