Terahertz Quantum Cascade Laser Operating at 2.94 THz

• Published in: Chinese physics letters Vol. 27; no. 10; pp. 107 - 109
• Main Author: 刘俊岐 陈剑燕 刘峰奇 李路 王利军 王占国
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.10.2010
• Subjects: 光功率; 太赫兹; 特征温度; 等离子体波导; 绝缘表面; 量子效率; 量子级联激光器; 阈值电流密度
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/10/104205

The development of quantum cascade laser at 2.94 THz is reported. The laser structure is based on a bound-to-continuum active region and a semi-insulating surface-plasmon waveguide. Lasing is observed up to a heat-sink temperature of 70 K in pulsed mode with light power of 4.75 mW at 10 K and 1 mW at 70 K. A threshold current density of 296.5 A/cm2 and an internal quantum efficiency of 1.57 × 10-2 per cascade period are also observed at 10 K. The characteristic temperature of this laser is extracted to be T0 = 57.5 K.