Buried heterostructure terahertz quantum cascade lasers for epilayer-down mounting with high continuous-wave power

Yu Ma; Wei-Jiang Li; Yun-Fei Xu; Jun-Qi Liu; Ning Zhuo; Ke Yang; Jin-Chuan Zhang; Shen-Qiang Zhai; Shu-Man Liu; Li-Jun Wang; Feng-Qi Liu

doi:10.1117/12.2665324

31 January 2023 Buried heterostructure terahertz quantum cascade lasers for epilayer-down mounting with high continuous-wave power

Yu Ma, Wei-Jiang Li, Yun-Fei Xu, Jun-Qi Liu, Ning Zhuo, Ke Yang, Jin-Chuan Zhang, Shen-Qiang Zhai, Shu-Man Liu, Li-Jun Wang, Feng-Qi Liu

Author Affiliations +

Proceedings Volume 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022); 125050Z (2023) https://doi.org/10.1117/12.2665324
Event: Earth and Space: From Infrared to Terahertz (ESIT 2022), 2022, Nantong, China

Abstract

We have made improvements for QCL in the thermal management to produce high output power. Unlike the previous literature, we use epilayer-down mounting and buried heterostructures to achieve high output power by improving the heat dissipation and reducing the thermal resistance. At 20 K, the continuous wave threshold current density is 110 A·cm-2 and the maximum current density is 210 A·cm−2. The maximum output power is about 250 mW at single facet. The central frequency is approximately ∼4 THz, which matches the energy band design. The thermal simulation shows that, compared with the traditional device, the heat removal performance of the optimized device is significantly improved, and the core temperature is reduced by about 20 K. It improves the heat extraction through epilayer-down mounting and buried heterostructures and leads also to significant lateral heat fluxes. The ways can facilitate the heat extraction in all in-plane directions. In conclusion, this method is beneficial to the development of high continuous wave power, especially for thick active region design. The demonstration of buried heterostructure terahertz quantum cascade lasers for epilayer-down mounting can promote the development of high-power terahertz source in continuous wave.

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Yu Ma, Wei-Jiang Li, Yun-Fei Xu, Jun-Qi Liu, Ning Zhuo, Ke Yang, Jin-Chuan Zhang, Shen-Qiang Zhai, Shu-Man Liu, Li-Jun Wang, and Feng-Qi Liu "Buried heterostructure terahertz quantum cascade lasers for epilayer-down mounting with high continuous-wave power", Proc. SPIE 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022), 125050Z (31 January 2023); https://doi.org/10.1117/12.2665324

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