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Enhanced stimulated polariton scattering induced by 532 nm green laser in KTiOPO4 terahertz parametric oscillator was demonstrated in this paper. An expanded terahertz wave tuning range from 5.7 to 6.1 THz, from 7.4 to 7.8 THz, from 11.5 to 11.8 THz and from 13.3 to 13.5 THz was achieved. The maximum terahertz output energy was 1.61 μJ at 7.57 THz, additionally, the energy levels of the terahertz...
A high-energy, low threshold THz-wave output has been experimentally demonstrated with intracavity terahertz-wave parametric oscillator based on surface-emitted configuration. The maximum THz-wave output energy of 283nJ/pulse was obtained at 1.54THz under the pump threshold of 12.9mJ/pulse in the cavity. The continuously tunable range from 0.75 to 2.75 THz was realized.
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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