Calculation of Modal Gain for Terahertz Lasers Based on HgCdTe Heterostructures with Quantum Wells

In this work we calculate and analyze modal gain for terahertz lasers based on HgCdTe heterostructures with quantum wells (QWs) taking into account the symmetry-enforced light hole-heavy hole mixing at the quantum well interfaces. We have found that modal gain for a structure with 5 HgTe QWs of the 5.2 nm width can be 33 cm⁻¹ at 9 THz.