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Continuous-wave highly-efficient low-divergence terahertz wire lasers

Author

Listed:
  • Simone Biasco

    (CNR—Istituto Nanoscienze and Scuola Normale Superiore)

  • Katia Garrasi

    (CNR—Istituto Nanoscienze and Scuola Normale Superiore)

  • Fabrizio Castellano

    (CNR—Istituto Nanoscienze and Scuola Normale Superiore)

  • Lianhe Li

    (University of Leeds)

  • Harvey E. Beere

    (University of Cambridge)

  • David A. Ritchie

    (University of Cambridge)

  • Edmund H. Linfield

    (University of Leeds)

  • A. Giles Davies

    (University of Leeds)

  • Miriam S. Vitiello

    (CNR—Istituto Nanoscienze and Scuola Normale Superiore)

Abstract

Terahertz (THz) quantum cascade lasers (QCLs) have undergone rapid development since their demonstration, showing high power, broad-tunability, quantum-limited linewidth, and ultra-broadband gain. Typically, to address applications needs, continuous-wave (CW) operation, low-divergent beam profiles and fine spectral control of the emitted radiation, are required. This, however, is very difficult to achieve in practice. Lithographic patterning has been extensively used to this purpose (via distributed feedback (DFB), photonic crystals or microcavities), to optimize either the beam divergence or the emission frequency, or, both of them simultaneously, in third-order DFBs, via a demanding fabrication procedure that precisely constrains the mode index to 3. Here, we demonstrate wire DFB THz QCLs, in which feedback is provided by a sinusoidal corrugation of the cavity, defining the frequency, while light extraction is ensured by an array of surface holes. This new architecture, extendable to a broad range of far-infrared frequencies, has led to the achievement of low-divergent beams (10°), single-mode emission, high slope efficiencies (250 mW/A), and stable CW operation.

Suggested Citation

  • Simone Biasco & Katia Garrasi & Fabrizio Castellano & Lianhe Li & Harvey E. Beere & David A. Ritchie & Edmund H. Linfield & A. Giles Davies & Miriam S. Vitiello, 2018. "Continuous-wave highly-efficient low-divergence terahertz wire lasers," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03440-4
    DOI: 10.1038/s41467-018-03440-4
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    Cited by:

    1. Xuecou Tu & Yichen Zhang & Shuyu Zhou & Wenjing Tang & Xu Yan & Yunjie Rui & Wohu Wang & Bingnan Yan & Chen Zhang & Ziyao Ye & Hongkai Shi & Runfeng Su & Chao Wan & Daxing Dong & Ruiying Xu & Qing-Yua, 2024. "Tamm-cavity terahertz detector," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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