The Japan Society of Applied Physics

2023 International Conference on Solid State Devices and Materials

2023 International Conference on Solid State Devices and Materials

Sep 5, 2023 - Oct 31, 2023
Nagoya Congress Center

11:45 AM - 12:00 PM

[H-6-05] Phonon-assisting injection three quantum-levels terahertz quantum cascade lasers for high-temperature operation

○Li Wang1, Mingxi Chen1, Tsung-Tse Lin1, Ke Wang2, Hideki Hirayama1 (1. Terahertz quantum device research team, RIKEN center for advanced photonics (Japan), 2. Nanjing university (China))

https://doi.org/10.7567/SSDM.2023.H-6-05

This study investigates the impact of parasitic absorption on the performance of terahertz quantum cascade lasers that use the nonalignment injection scheme via direct-phonon resonance. It finds the nonrelevant quantum levels can inherently limit the optical gain in this concept based on two quantum wells architecture, even along a low temperature. To mitigate this issue, a suppression strategy by increasing the injection energy is proposed to isolate the relevant levels. Experimental results demonstrate the feasibility of this strategy by achieving a lasing at 194 K.