Abstract
Different phase-locking schemes are developed for surface-emitting terahertz quantum-cascade lasers (QCLs) with watt-level output power and radiating in symmetric single-lobed beams. In the first-scheme, multiple metallic microcavities are coupled through surface-plasmon-polaritons traveling in surrounding medium of cavities, that leads to peak-power output of 2.03W for a single-mode 3.3THz QCL with a slope-efficiency of 1.57W/A. In the second-scheme, a phase-locking scheme with hybrid second- and fourth-order Bragg gratings is demonstrated to realize a multi-mode surface-emitting THz QCL with 2.13W output power. Both QCLs operate at ~60K. Preliminary data for a scheme to achieve electrical tunability of such lasers is also reported.
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