Phase-locking has improved the beam purity of a 3.3THz (88−94µm) quantum cascade laser (QCL) to create a single-mode 2W output with 2.3% wall-plug efficiency. “To the best of our knowledge, the radiative efficiency of our terahertz lasers is the highest demonstrated for any single-wavelength QCL to-date and is the first report of a radiative efficiency ...
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