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      Single-mode operation of electrically pumped edge-emitting lasers through cavity coupling of high order modes

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      Author(s)
      Şeker, Enes
      Şengül, Serdar
      Dadashi, Khalil
      Olyaeefar, Babak
      Demir, Abdullah
      Date
      2022-03-04
      Source Title
      International Society for Optical Engineering. Proceedings
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      11983
      Pages
      1 - 8
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      The output power of a typical single-mode semiconductor laser is limited by its narrow waveguide width required to cut off high-order spatial modes. Conventional techniques rely on engineering the waveguide without introducing higherorder modes. In contrast, this work utilizes the concept of coupled-cavity (CC) structures. A single-mode lasing is achieved by employing a multi-mode and a neighboring single-mode waveguide. The CC approach is based on the resonant coupling of the high-order mode in the wide waveguide to the fundamental mode of a narrower lossy waveguide. First, geometrical dispersion of the CC lasers, such as their width, spacing, and their sensitivity to the resonance, was investigated. After optimizing the design, edge-emitting-lasers were fabricated using high-efficiency GaAs-based structures. Optical mode control and single-mode operation of the design are demonstrated through fundamental optical characterization measurements. The output power curves for the single and CC designs show similar slope efficiencies suggesting the proposed method as a promising approach towards high-power single lateral mode operation of edge-emitting lasers.
      Keywords
      Semiconductor lasers
      Single-mode
      Waveguide coupling
      Mode filtering
      Coupled-cavity
      Permalink
      http://hdl.handle.net/11693/111541
      Published Version (Please cite this version)
      https://doi.org/10.1117/12.2607939
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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