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Increasing the output power or the wall-plug efficiency (WPE) of THz quantum cascade (QC) lasers is a topic of great interest, since it could have a major impact on applications. Once a high-performance active region is employed, the key ingredient is the laser resonator. Several effective solutions have been developed in by the scientific community [1, 2, 3]. More generally, periodic metal/semiconductor...
We report high-power, single-mode surface-emission from THz quantum cascade (QC) lasers with a type-II photonic heterostructure (PHS) resonator. Such resonator selectively excites the unusual radiative mode with significantly enhanced radiation efficiency. The PHS lasers (f ∼ 3.4 THz) exhibit peak output powers of 103 mW at 20K, and the maximum operation temperature (Tmax) is 120K in pulsed mode....
We demonstrate spectrally single-mode, low-divergence surface-emission from photonic-crystal quantum cascade lasers operating in the mid-infrared spectral range (lambda~7.2 mum). The photonic-crystal resonator is defined by the sole top metallization. No semiconductor etch is employed. The effective index contrast is induced by the different profiles of surface plasmon and air-confined modes. Numerical...
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