• Photonics Research
  • Vol. 10, Issue 12, 2686 (2022)
1,2, 1,2, 1,2, 1,2,4,*..., 1,2,5,*, 1,6,*, 3, 1, 1, 1,2 and 1,2,3|Show fewer author(s)
Author Affiliations
  • 1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • 2College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101408, China
  • 3Division of Quantum Materials and Devices, Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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    DOI: 10.1364/PRJ.467974 Cite this Article Set citation alerts
    Weijiang Li, Yu Ma, Yunfei Xu, Junqi Liu, Lijun Wang, Ning Zhuo, Quanyong Lu, Jinchuan Zhang, Shenqiang Zhai, Shuman Liu, Fengqi Liu, "Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design," Photonics Res. 10, 2686 (2022) Copy Citation Text show less

    Abstract

    We report on the terahertz (THz) quantum cascade lasers in continuous-wave (CW) operation with an emitting frequency above 5 THz. Excellent performance with a smaller leakage current and higher population inversion efficiency is obtained by one-well bridged bound-to-continuum hybrid quantum design at 5 THz. By designing and fabricating a graded metallic sampled distributed feedback grating in the waveguide, the first single-mode THz quantum cascade laser at 5.13 THz in CW operation mode is achieved. The maximum single-mode optical power of 48mW is achieved at 15 K with a side-mode suppression ratio above 24 dB. This will draw great interest in the spectroscopy applications above the 5 THz range for THz quantum cascade lasers.
    J=qNs2|Ω|2τ1+Δ2τ2+4|Ω|2τuτ,

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    2Λ=Nλ0neff,

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    12neffZ=1λ±11λ0,

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    Weijiang Li, Yu Ma, Yunfei Xu, Junqi Liu, Lijun Wang, Ning Zhuo, Quanyong Lu, Jinchuan Zhang, Shenqiang Zhai, Shuman Liu, Fengqi Liu, "Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design," Photonics Res. 10, 2686 (2022)
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