High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode

Journal Article · Fri Jul 15 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4959195· OSTI ID:22611446

Wang, Xuemin; Shen, Changle; Jiang, Tao; Zhan, Zhiqiang; Deng, Qinghua; Li, Weihua; Wu, Weidong ^[1]; Yang, Ning; Chu, Weidong; Duan, Suqing ^[2]

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1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, Sichuan (China)
2. Institute of Applied Physics and Computational Mathematics, Beijing, 100088 (China)

Terahertz quantum cascade lasers with a record output power up to ∼0.23 W in continuous wave mode were obtained. We show that the optimal 2.9-mm-long device operating at 3.11 THz has a low threshold current density of 270 A/cm{sup 2} at ∼15 K. The maximum operating temperature arrived at ∼65 K in continuous wave mode and the internal quantum efficiencies decreased from 0.53 to 0.19 for the devices with different cavity lengths. By using one convex lens with the effective focal length of 13 mm, the beam profile was collimated to be a quasi Gaussian distribution.

• OSTI ID: 22611446
• Journal Information: AIP Advances, Vol. 6, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAM PROFILES
BEAMS
CURRENT DENSITY
EQUIPMENT
GAUSS FUNCTION
LASERS
LENSES
QUANTUM EFFICIENCY
THRESHOLD CURRENT