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We present the first direct observation of 26.5 GHz direct modulation of mid infrared buried heterostructure quantum cascade laser (QCL) emitting at 9 μm. For these measurements we have used an ultra-fast QWIP detector with 65 GHz bandwidth. As expected the modulation frequency bandwidth increases by increasing the laser driving DC current. Finally, we demonstrate that the laser cavity round trip...
We demonstrate semiconductor resonators operating on the fundamental monopolar resonance which corresponds to the fundamental oscillation mode of split-ring resonators. Their size is considerably below the optical diffraction limit in all three dimensions of space. The maximum confinement is obtained for resonators operating at a wavelength of λ ∼ 272 μm (v ∼ 1.1 THz): they have a diameter of 13 μm...
Electro-optic sampling in ZnTe is used to phase-lock the line of a 2.5 THz quantum cascade laser to the repetition rate of a femtosecond fibre laser and to perform an absolute measurement of the laser emission frequency.
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