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High power surface emitting terahertz laser with hybrid second- and fourth-order Bragg gratings

Author

Listed:
  • Yuan Jin

    (Lehigh University)

  • Liang Gao

    (Lehigh University)

  • Ji Chen

    (Lehigh University)

  • Chongzhao Wu

    (Lehigh University)

  • John L. Reno

    (Center of Integrated Nanotechnologies)

  • Sushil Kumar

    (Lehigh University)

Abstract

A surface-emitting distributed feedback (DFB) laser with second-order gratings typically excites an antisymmetric mode that has low radiative efficiency and a double-lobed far-field beam. The radiative efficiency could be increased by using curved and chirped gratings for infrared diode lasers, plasmon-assisted mode selection for mid-infrared quantum cascade lasers (QCLs), and graded photonic structures for terahertz QCLs. Here, we demonstrate a new hybrid grating scheme that uses a superposition of second and fourth-order Bragg gratings that excite a symmetric mode with much greater radiative efficiency. The scheme is implemented for terahertz QCLs with metallic waveguides. Peak power output of 170 mW with a slope-efficiency of 993 mW A−1 is detected with robust single-mode single-lobed emission for a 3.4 THz QCL operating at 62 K. The hybrid grating scheme is arguably simpler to implement than aforementioned DFB schemes and could be used to increase power output for surface-emitting DFB lasers at any wavelength.

Suggested Citation

  • Yuan Jin & Liang Gao & Ji Chen & Chongzhao Wu & John L. Reno & Sushil Kumar, 2018. "High power surface emitting terahertz laser with hybrid second- and fourth-order Bragg gratings," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03697-9
    DOI: 10.1038/s41467-018-03697-9
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    Cited by:

    1. Junhong Liu & Yunfei Xu & Rusong Li & Yongqiang Sun & Kaiyao Xin & Jinchuan Zhang & Quanyong Lu & Ning Zhuo & Junqi Liu & Lijun Wang & Fengmin Cheng & Shuman Liu & Fengqi Liu & Shenqiang Zhai, 2024. "High-power electrically pumped terahertz topological laser based on a surface metallic Dirac-vortex cavity," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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