Theoretical analysis of spectral gain in a terahertz quantum-cascade laser: Prospects for gain at 1 THz
- 29 September 2003
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 83 (13) , 2506-2508
- https://doi.org/10.1063/1.1614440
Abstract
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.Comment: in press APL, tentative publication date 29 Sep 200Keywords
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