中国物理B ›› 2026, Vol. 35 ›› Issue (4): 44207-044207.doi: 10.1088/1674-1056/ae29f9

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Supersymmetry-driven segmented tapered laser for stabilized single transverse and longitudinal mode engineering

Yiwen Lou(楼亦文)1,2, Tian Lan(兰天)1,2,†, Jun Qi(齐军)1,2, Jinlong Zhao(赵金龙)1,2, Ying Li(李颖)3, Baiyi Qin(覃柏颐)1,2, Yuying Liu(刘豫颖)1,2, Xuesheng Liu(刘学胜)1,2,‡, and Zhiyong Wang (王智勇)1,2   

  1. 1 Institute of Advanced Technology on Semiconductor Optics & Electronics, Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China;
    2 Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing 100124, China;
    3 Beijing Institute of Radio Metrology and Measurement, Beijing 100124, China
  • 收稿日期:2025-08-27 修回日期:2025-11-23 接受日期:2025-12-09 发布日期:2026-04-07
  • 通讯作者: Tian Lan, Xuesheng Liu E-mail:lantian9094@bjut.edu.cn;liuxuesheng@bjut.edu.cn
  • 基金资助:
    This research was funded by the Science and Technology Commission Foundation of the Central Military Commission of China (Grant No. 2023-JCJQ-JJ-1008).

Supersymmetry-driven segmented tapered laser for stabilized single transverse and longitudinal mode engineering

Yiwen Lou(楼亦文)1,2, Tian Lan(兰天)1,2,†, Jun Qi(齐军)1,2, Jinlong Zhao(赵金龙)1,2, Ying Li(李颖)3, Baiyi Qin(覃柏颐)1,2, Yuying Liu(刘豫颖)1,2, Xuesheng Liu(刘学胜)1,2,‡, and Zhiyong Wang (王智勇)1,2   

  1. 1 Institute of Advanced Technology on Semiconductor Optics & Electronics, Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China;
    2 Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing 100124, China;
    3 Beijing Institute of Radio Metrology and Measurement, Beijing 100124, China
  • Received:2025-08-27 Revised:2025-11-23 Accepted:2025-12-09 Published:2026-04-07
  • Contact: Tian Lan, Xuesheng Liu E-mail:lantian9094@bjut.edu.cn;liuxuesheng@bjut.edu.cn
  • Supported by:
    This research was funded by the Science and Technology Commission Foundation of the Central Military Commission of China (Grant No. 2023-JCJQ-JJ-1008).

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摘要： Tapered lasers are extensively employed in high power single-mode lasing, yet still suffering from the potential formation of higher-order transverse modes in the tapered region, which severely degrades the laser beam quality. Herein, we propose a novel supersymmetric segmented tapered laser to achieve stable fundamental transverse mode operation. Our design features a three-segmented tapered waveguide along the light propagation direction, with sub-waveguides of varying widths flanking each main waveguide segment. The main waveguides measure 8 μm, 12 μm, and 16 μm in width. Specifically, the 8 μm main waveguide has a corresponding subsidiary waveguide of 2.67 μm; the 12 μm main waveguide has two subsidiary waveguides measuring 4.82 μm and 6.63 μm; and the 16 μm main waveguide has two subsidiary waveguides measuring 7.13 μm and 3.68 μm. Using the coupled-mode theory, we systematically analyzed the coupling coefficients under different inter-waveguide spacings, leading to an optimized spacing of 1.2 μm through comprehensive theoretical simulations and fabrication compatibility constraints. Furthermore, phase-shifted gratings were integrated between tapered waveguide segments to enable precise longitudinal mode selection. This synergistic design could successfully realize robust single-mode operation, offering a scalable framework for on-chip integrated high-power, high-beam-quality tapered lasers.

关键词: supersymmetric theory, phase-shifted gratings, tapered laser, single mode

Abstract: Tapered lasers are extensively employed in high power single-mode lasing, yet still suffering from the potential formation of higher-order transverse modes in the tapered region, which severely degrades the laser beam quality. Herein, we propose a novel supersymmetric segmented tapered laser to achieve stable fundamental transverse mode operation. Our design features a three-segmented tapered waveguide along the light propagation direction, with sub-waveguides of varying widths flanking each main waveguide segment. The main waveguides measure 8 μm, 12 μm, and 16 μm in width. Specifically, the 8 μm main waveguide has a corresponding subsidiary waveguide of 2.67 μm; the 12 μm main waveguide has two subsidiary waveguides measuring 4.82 μm and 6.63 μm; and the 16 μm main waveguide has two subsidiary waveguides measuring 7.13 μm and 3.68 μm. Using the coupled-mode theory, we systematically analyzed the coupling coefficients under different inter-waveguide spacings, leading to an optimized spacing of 1.2 μm through comprehensive theoretical simulations and fabrication compatibility constraints. Furthermore, phase-shifted gratings were integrated between tapered waveguide segments to enable precise longitudinal mode selection. This synergistic design could successfully realize robust single-mode operation, offering a scalable framework for on-chip integrated high-power, high-beam-quality tapered lasers.

Key words: supersymmetric theory, phase-shifted gratings, tapered laser, single mode

中图分类号:  (Lasers)

  • 42.55.-f
42.60.-v (Laser optical systems: design and operation) 42.55.Px (Semiconductor lasers; laser diodes)