[20p-C401-1~16] 13.6 Nanostructures, quantum phenomena, and nano quantum devices

▲ [20p-C401-10] Clarified scheme for obtaining 350K optical gain in 3~4THz GaAs/AlGaAs quantum cascade laser

〇WANG LI¹, Tsung-Tse LIN¹, Thomas Grange², Stefan Birner², Ke Wang^1,3, Hideki Hirayama¹ (1.RIKEN, 2.nextnano, Germany, 3.Nanjing University, China)

Keywords:quantum cascasde lasers

This work shows the design scheme to obtain high temperature-tolerance optical gain in terahertz quantum cascade lasers. The optical gain more than the cavity threshold is predicted above room-temperatures. The schemes can be summarized into three items, that is (1) isolated three quantum states system is created; (2) indirect injection is realized; (3) optimal oscillator strength for state lifetime balance is shown.