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Quantum Cascade Lasers are promising sources of Terahertz radiation. Picosecond pulses generation with these lasers is currently at its infancy and their detection is difficult. An intensity electro-optic sampling method is used here to demonstrate 19ps FWHM pulses from a QCL via active modelocking.
We demonstrate the phase-locking of a 2.7Terahertz Quantum Cascade Laser to the repetition rate of a commercial Er-doped fiber-fs-laser. We observe a linewidth of the beatnote signal with a signal-to-noise of 80dB in 1Hz bandwidth.
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