Terahertz generation in quantum cascade structures by two-color deriving fields: An approach to reach inversion population via optical pumping |
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Institution: | Department of Electrical Engineering, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran |
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Abstract: | In this paper, a quantum cascade laser (QCL) design is proposed based on GaAs/AlGaAs material system, which simultaneously operates at three widely separated wavelengths ( and ). In the design, all the wavelength radiations are achieved by the engineering of the electronic spectrum via the quantum-well widths and the applied electric field in a single active region within a same waveguide. The mid-infrared (mid-IR) wavelengths are obtained by adoption a dual-upper-state active region, and the proposed design aims to use both the mid-IR radiations as the coherent deriving fields to populate the upper THz lasing state to aid the THz-laser population inversion via optical pumping instead of direct electrical injection. A detailed analysis of electronic transport in the structure is carried out using a multi-level rate-equation model. The results show that the proposed structure offers an alternative approach to room temperature THz generation in QCLs. |
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Keywords: | Quantum cascade laser (QCL) Terahertz (THz) generation Two-color optical pumping Rate equation model |
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