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We demonstrate that the cavity resonance frequency - the round-trip frequency - of terahertz quantum cascade lasers can be injection-locked by direct modulation of the bias current using an RF source. Metal-metal and single-plasmon waveguide devices with roundtrip frequencies up to 35GHz have been studied, and show locking ranges above 200MHz. Inside this locking range the laser round-trip frequency...
We demonstrate the phase-locking of Quantum Cascade Lasers emitting at 2.4 and 2.7Terahertz, to the repetition rate of a commercial Er-doped fiber-fs-laser. We observe a linewidth of the beat-note signal with a signal-to-noise of 80dB in 1Hz bandwidth.
We have used the Pockels effect in ZnTe to demonstrate that the frequency and the phase of Quantum Cascade Lasers emitting at 2.4 and 2.7 Terahertz can be actively stabilized to the n-th harmonic of the 90 MHz repetition rate of a commercial, mode-locked Er-doped fiber-laser. The beating between the stabilized QCL frequency and the harmonic of the repetition rate yielded a signal-to-noise ratio >;...
Recent results are presented on the non-linear intra-cavity up-conversion in the telecom range and the microwave modulation of THz quantum cascade lasers.
Recent progress in the up-conversion of THz signals to the near-infrared region using the second order non-linearity of GaAs is presented. The process is used to demonstrate phase matched intra-cavity THz sideband generation at lambda~1.55mum within a THz quantum cascade laser (f=2.8THz). Furthermore, the phase matched point is shown to be tunable over a wide wavelength range via engineering of the...
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