High power-efficiency terahertz quantum cascade laser

doi:10.1088/1674-1056/25/8/084206

Abstract We demonstrate continuous-wave (CW) high power-efficiency terahertz quantum cascade laser based on semi-insulating surface-plasmon waveguide with epitaxial-side down (Epi-down) mounting process. The performance of the device is analyzed in detail. The laser emits at a frequency of ~3.27 THz and has a maximum CW operating temperature of ~70 K. The peak output powers are 177 mW in pulsed mode and 149 mW in CW mode at 10 K for 130-μm-wide Epi-down mounted lasers. The record wall-plug efficiencies in direct measurement are 2.26% and 2.05% in pulsed and CW mode, respectively.

Keywords: terahertz lasers quantum cascade lasers epitaxial-side down mounting

Received: 24 February 2016
Revised: 12 April 2016
Accepted manuscript online:

PACS:	42.55.Px	(Semiconductor lasers; laser diodes)
	73.63.Hs	(Quantum wells)
	85.35.Be	(Quantum well devices (quantum dots, quantum wires, etc.))

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2014CB339803 and 2013CB632801), the Special-funded Program on National Key Scientific Instruments and Equipment Development, China (Grant No. 2011YQ13001802-04), and the National Natural Science Foundation of China (Grant No. 61376051).

Corresponding Authors: Jun-Qi Liu, Feng-Qi Liu
E-mail: jqliu@semi.ac.cn;fqliu@red.semi.ac.cn

Cite this article:

Yuan-Yuan Li(李媛媛), Jun-Qi Liu(刘俊岐), Feng-Qi Liu(刘峰奇), Jin-Chuan Zhang(张锦川), Shen-Qiang Zhai(翟慎强), Ning Zhuo(卓宁), Li-Jun Wang(王利军), Shu-Man Liu(刘舒曼), Zhan-Guo Wang(王占国) High power-efficiency terahertz quantum cascade laser 2016 Chin. Phys. B 25 084206

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