Average-Power Scaling of Gas-Plasma Generated THz Radiation

We present the generation of broadband terahertz radiation. Driven by a multipass cell compressed high-power fiber laser system at a repetition rate of 200 kHz an average power of 94 mW is generated with the two color gas-plasma scheme. The full bandwidth of the pulses are characterized by a measurement based on the air-biased coherent detection. By using the full potential of the driving laser further power scaling of the generated THz power towards watt-level average power can be expected in the near future.