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2009•Unpublished venueRequires access

Non-equilibrium green's function calculation for terahertz quantum cascade lasers

Hiroaki Yasuda, Tillmann Kubis, P. Vogl, Norihiko Sekine, Iwao Hosako, Kazuhiko Hirakawa

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Abstract

In this paper, we have calculated performance of the novel four-level THz-QCLs with the non-equilibrium Green's function (NEGF) method. The calculation result for 40 K showed that the indirect-pump QCL has the largest THz gain. The main origin for this is that almost all electrons contribute to lasing in the new scheme. However, the advantage of gain deteriorates at 200 K due to thermally activated phonon scattering.

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What this paper is about

In this paper, we have calculated performance of the novel four-level THz-QCLs with the non-equilibrium Green's function (NEGF) method. The calculation result for 40 K showed that the indirect-pump QCL has the largest THz gain. The main origin for this is that almost all electrons contribute to lasing in the new scheme. However, the advantage of gain deteriorates at 200 K due to thermally activated phonon scattering.

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Available abstract

In this paper, we have calculated performance of the novel four-level THz-QCLs with the non-equilibrium Green's function (NEGF) method. The calculation result for 40 K showed that the indirect-pump QCL has the largest THz gain. The main origin for this is that almost all electrons contribute to lasing in the new scheme. However, the advantage of gain deteriorates at 200 K due to thermally activated phonon scattering.

Key concepts: Terahertz radiation, Lasing threshold, Cascade, Laser, Optoelectronics, Scattering, Phonon, Quantum

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