Theoretical analysis of spectral gain in a THz quantum cascade laser: prospects for gain at 1 THz

Details Theoretical analysis of spectral gain in a THz quantum cascade laser: prospects for gain at 1 THz Theoretical analysis of spectral gain in a THz quantum cascade laser: prospects for gain at 1 THz

2003-08-25

arxiv.org/abs/cond-mat/0308499v1

APL 83, 2506 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

in press APL, tentative publication date 29 Sep 2003

Scientific paper

10.1063/1.1614440

In a recent Letter [Appl. Phys. Lett. 82, 1015 (2003)], Williams et al. reported the development of a terahertz quantum cascade laser operating at 3.4 THz or 14.2 meV. We have calculated and analyzed the gain spectra of the quantum cascade structure described in their work, and in addition to gain at the reported lasing energy of ~= 14 meV, we have discovered substantial gain at a much lower energy of around 5 meV or just over 1 THz. This suggests an avenue for the development of a terahertz laser at this lower energy, or of a two-color terahertz laser.

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