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We demonstrate coherent detection of the emission from a terahertz frequency quantum cascade laser which is actively mode-locked by modulating its bias-current with a microwave synthesizer. Coherent sampling of the terahertz pulse train is achieved by phase-locking the repetition rate and the carrier frequency of the terahertz quantum cascade laser to the repetition rate of the of a commercial erbium-doped...
We demonstrate full control of the spectral and spatial emission properties of terahertz quantum cascade lasers using metallic photonic-crystals for lateral confinement. Single-mode, surface-emission is obtained at a frequency of 2.8-2.9 THz using a photonic-crystal design with a square lattice geometry. The resonator quality factor is then optimised, using a graded photonic-crystal architecture,...
Terahertz time-domain spectroscopy is used to determine gain related parameters of terahertz quantum-cascade lasers. Due to the techniquespsila insensitivity to the QCL emission, spectral gain narrowing is observed above laser threshold. By correlating these measurements with bandstructure simulations, insight into the subband alignment as a function of the applied field is acquired.
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