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We investigate techniques to manipulate the frequency of Terahertz Quantum Cascade Lasers (THz QCL). Frequency tuning by changing the heatsink temperature or the QCL drive current, or by illumination of the QCL with bandgap light. Creation of frequency sidebands through amplitude modulation of the drive current or the bandgap light. We report the observation of strong difference frequency generation...
We studied the phase locking and spectral linewidth of a 2.7 THz quantum cascade laser by mixing its two lateral lasing modes using a superconducting bolometer mixer.
Highly divergent radiation is expected from lasers with sub-wavelength apertures due to diffraction. However the short range variations of intensity have been observed in the far field of THz quantum cascade lasers with sub-wavelength apertures. We developed an antenna model for long lasers with subwavelength transverse dimensions (wire lasers). Based on this model we show that the observed far field...
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