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We show the coherent detection of the laser emission from seeded terahertz (THz) quantum cascade lasers (QCL) with metal-metal waveguides using free-space coupling of a THz pulses to the sub-wavelength waveguide. We implement a simple, monolithic planar horn antenna design on the metalmetal waveguide that reduces the impedance mismatch to the waveguide. The laser emission is seeded and coherently...
We propose and study GaAs/Al25Ga75As terahertz frequency quantum cascade lasers in which mid-infrared radiation is used as a coherent drive for enhancing the terahertz gain.
The emission of a quantum cascade laser can be synchronized to the repetition rate of a femtosecond laser through the use of coherent injection seeding. This synchronization defines a sampling coherence between the terahertz laser emission and the femtosecond laser which enables coherent field detection. In this contribution the sampling coherence is measured in the time-domain through the use of...
We measure the sampling coherence between a quantum cascade laser and a reference femtosecond laser. In addition to complete and incomplete sampling coherence, quantum cascade lasers can exhibit partial sampling coherence that varies with time.
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