Low Threshold Current Density Operation of Strain-Compensated Quantum Cascade Laser

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2007,（3）
• 页码范围: 717-720
• 页数: 4页
• 语种: 英文

摘要

We report the low threshold current density operation of strain-compensated In0.64 Ga0.36As/In0.38Al0.62As quantum cascade lasers emitting near 4.94 μm. By employing an enlarged strain-compensated structure and optimizing the injector doping density, a rather low threshold current density of 0.57 Ka/cm2 at 80 K is achieved for an uncoated 20-μm-wide and 2.5-mm-long laser.