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

TL;DR

This paper provides a theoretical analysis of spectral gain in a THz quantum cascade laser, revealing potential for gain at 1 THz, which could enable new terahertz laser applications.

Contribution

It introduces a theoretical framework that predicts substantial gain at around 1 THz in quantum cascade lasers, expanding the possibilities for terahertz laser development.

Findings

Substantial gain identified at ~5 meV (~1 THz)

Potential for two-color terahertz laser operation

Supports development of lower-energy THz lasers

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.