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Chin. Phys. B, 2026, Vol. 35(4): 044207    DOI: 10.1088/1674-1056/ae29f9
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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 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
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.
Keywords:  supersymmetric theory      phase-shifted gratings      tapered laser      single mode  
Received:  27 August 2025      Revised:  23 November 2025      Accepted manuscript online:  09 December 2025
PACS:  42.55.-f (Lasers)  
  42.60.-v (Laser optical systems: design and operation)  
  42.55.Px (Semiconductor lasers; laser diodes)  
Fund: This research was funded by the Science and Technology Commission Foundation of the Central Military Commission of China (Grant No. 2023-JCJQ-JJ-1008).
Corresponding Authors:  Tian Lan, Xuesheng Liu     E-mail:  lantian9094@bjut.edu.cn;liuxuesheng@bjut.edu.cn

Cite this article: 

Yiwen Lou(楼亦文), Tian Lan(兰天), Jun Qi(齐军), Jinlong Zhao(赵金龙), Ying Li(李颖), Baiyi Qin(覃柏颐), Yuying Liu(刘豫颖), Xuesheng Liu(刘学胜), and Zhiyong Wang (王智勇) Supersymmetry-driven segmented tapered laser for stabilized single transverse and longitudinal mode engineering 2026 Chin. Phys. B 35 044207

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