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2 kW, 200 ns pulses were produced in a noncollinear phase-matched GaAs crystal. The terahertz source tunable in the range 0.5-3.0 THz with a step of 40 GHz is pumped by a dual-beam TEA CO2 laser.
Seeded FEL/IFEL techniques can be used for modulation of a relativistic electron beam longitudinally on the radiation wavelength. However, in the 1-10 THz range, which is of particular importance for the matched injection of prebunched electrons into a laser-driven plasma accelerating structure, a suitable radiation source is not available. At the UCLA Neptune Laboratory we have built and fully characterized...
A 100 GW CO2 laser pulse with a duration of ~200 ps was guided in a 2-cm long stainless steel waveguide. Transmission was studied both for gas-filled and evacuated waveguides at intensities around 5 times 1014 W/cm2
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