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The Facility for Accelerator science and Experimental Tests (FACET) at SLAC National Accelerator Laboratory provides a 23-GeV high charge, sub-picosecond bunched electron beam that is ideal for pulsed THz light generation in the few-THz range. Pulsed THz lights based on coherent transition radiation have been demonstrated at FACET, with high peak electric field and high pulse energy. The intense TeraWatt...
The combination of a terahertz parametric oscillator and a large size surface-emitted injection-seeded terahertz parametric generator was used to generate nanosecond THz pulses. The obtained THz pulse energy at 1.74 THz was 6.5 µJ. This is the highest nanosecond THz pulse energy of the terahertz parametric sources.
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...
An experimental study on the emission of THz-radiation from InP1−xAsx and Ga1−xInxAs crystals is reported. The semiconductor materials were grown by a hybrid vertical Bridgman and gradient freezing directional solidification process. A directly diode pumped Ytterbium — and a conventional Titanium-Sapphire femtosecond laser oscillator were used to stimulate the emission of THz radiation from the semiconductor...
Intense radiation in the Terahertz frequency gap (0.1–20 THz) has been challenging in the past. Single-cycle Terahertz transients at high fields are a novel tool to investigate fundamental properties of condensed matter and ultimately to initiate coherently collective motions. However, high-power single-cycle pulses with fields > 100 MV/m in the Terahertz gap have remained a challenge. Here we...
A two-color interferometer and polarimeter using simultaneously oscillated 48- and 57-μm CH3OD lasers pumped by a 9R(8) CO2 laser have been developed for future plasma diagnostics. Using a frequency-stabilized pump CO2 laser and a twin type far-infrared (FIR) laser, the output power and the beat frequency have been stabilized by controlling the FIR laser cavity with a stepper motor. The stable two-color...
The THz/FarIR beamline at the Australian Synchrotron is currently extending its capabilities to includes lasers. These lasers could be used for photolysis, pyrolysis or steady state pump/probe experiments. We currently have a high powered cw CO2 laser and a pulsed YAG laser.
The influence of pumping mode on the output characteristic of terahertz parametric oscillators (TPO) is studied theoretically and experimentally. A multi-transverse mode laser was used as the pump source. With the improvement of the transverse mode of the pump beam, a significant increasing of THz output power was observed. The THz output energy decreased from 172nJ to 17nJ when M2 value of pump beam...
This paper reports on the performance of an electrically-tuned IR laser package used to drive 1550 nm continuous-wave photomixers. Unlike other 1550 nm based drive lasers that select the THz output frequency by temperature-tuning the IR laser wavelength, the pump lasers used in this study can be electronically tuned across the entire C-band, allowing quick selection of the THz output frequency in...
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