Tapered active-region, mid-infrared quantum cascade lasers for complete suppression of carrier-leakage currents

Dan Botez*, Jae Cheol Shin, Jeremy Daniel Kirch, Chun Chieh Chang, Luke James Mawst, Thomas Earles


研究成果: 書貢獻/報告類型會議論文篇章

2 引文 斯高帕斯(Scopus)


A new deep-well (DW) quantum-cascade laser (QCL) design: Tapered Active-Region (TA), for which the barrier layers in each active region are tapered such that their conduction band edges increase in energy from the injection barrier to the exit barrier, causes a significant increase in the energy difference between the upper laser level and the next higher energy level, E 54; thus, resulting in further carrier-leakage suppression compared to DW QCLs. High E 54 values (80 -100 meV) are primarily obtained because the energy separation between the first excited states of a pair of coupled QWs (CQWs) is larger when the CQWs are asymmetric than when they are symmetric. Then, we reach an optimized TA-QCL design (λ= 4.7 μm) for which E54 values as high as 99 meV are obtained, while insuring good carrier depopulation of the lower laser level (i.e., τ 3 = 0.2 ps) via the double-phonon-resonance scheme. In addition, the upper-laser-level lifetime increases by ∼ 15 % compared to that for conventional QCLs. As a result, the relative carrier leakage decreases to values ≤ 1% and the room-temperature (RT) threshold-current density decreases by ∼ 25 % compared to that for conventional QCLs. Then, we estimate that single-facet, continuous-wave (CW) RT wallplug-efficiency values as high as 27 % are possible. Preliminary results from TA QCLs include T 0 and T 1 values as high as 231 K and 797 K, respectively, over the 20-60 oC heatsink-temperature range.

主出版物標題Novel In-Plane Semiconductor Lasers XI
出版狀態已發佈 - 2012
事件Novel In-Plane Semiconductor Lasers XI - San Francisco, CA, 美国
持續時間: 2012 1月 232012 1月 26


名字Proceedings of SPIE - The International Society for Optical Engineering


會議Novel In-Plane Semiconductor Lasers XI
城市San Francisco, CA

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程


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