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We present unique time-domain measurements of terahertz quantum cascade lasers. By coupling broadband terahertz pulses into the laser's waveguide the losses and gain in the frequency range 0.5 - 3.5 THz are determined. Furthermore internal processes and the laser dynamics can be tracked directly in the time- domain. The performance of THz-QCLs fabricated as double metal resonators is studied as a...
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