| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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High-Power and High-Efficiency Operation of Terahertz Quantum Cascade Lasers at 3.3 THz |
| LI Yuan-Yuan, LIU Jun-Qi**, WANG Tao, LIU Feng-Qi**, ZHAI Shen-Qiang, ZHANG Jin-Chuan, ZHUO Ning, WANG Li-Jun, LIU Shu-Man, WANG Zhan-Guo |
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
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| Cite this article: |
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LI Yuan-Yuan, LIU Jun-Qi, WANG Tao et al 2015 Chin. Phys. Lett. 32 104203 |
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Abstract A high-power and high-efficiency GaAs/AlGaAs-based terahertz (THz) quantum cascade laser structure emitting at 3.3 THz is presented. The structure is based on a hybrid bound-to-continuum transition and resonant-phonon extraction active region combined with a semi-insulating surface-plasmon waveguide. By optimizing material structure and device processing, the peak optical output power of 758 mW with a threshold current density of 120 A/cm2 and a wall-plug efficiency of 0.92% at 10 K and 404 mW at 77 K are obtained in pulsed operation. The maximum operating temperature is as high as 115 K. In the cw mode, a record optical output power of 160 mW with a threshold current density of 178 A/cm2 and a wall-plug efficiency of 1.32% is achieved at 10 K.
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Received: 17 July 2015
Published: 30 October 2015
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| PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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73.63.Hs
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(Quantum wells)
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85.35.Be
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(Quantum well devices (quantum dots, quantum wires, etc.))
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