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<p>Single-spatial-mode lasers with high efficiency and watt-level output in the 97x-nm wavelength range are in strong demand for a variety of applications. In this work, we explore ridge waveguide (RW) lasers based on an Extreme Triple Asymmetric (ETAS) epitaxial structure. Through optimized epitaxial design, the conversion efficiency of our ETAS-based ridge lasers is improved by over 12% at high powers compared to our prior designs using an Extreme Double Asymmetric (EDAS) structure. A 7-µm ridge-width ETAS-based laser with an antireflection (AR) coating of <i>R</i><sub><i>f</i></sub> = 2% and a high reflection (HR) coating of <i>R</i><sub><i>r</i></sub> = 95% achieves single-spatial-mode operation, delivering a peak efficiency of 61.2% at 1&#xa0;W output and sustaining 60.1% efficiency at 1.41&#xa0;W output under 1.5&#xa0;A drive current. Reducing AR coating reflectivity (<i>R</i><sub><i>f</i></sub> = 0.5%) enhances beam quality, achieving near-diffraction-limited single-mode emission with M<sup>2</sup> 1/e values maintained below 1.15 up to a drive current of 1.45&#xa0;A. These results highlight the potential of ETAS-based lasers for high-performance applications requiring high-power high-efficiency single-spatial-mode lasing emissions.</p>

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Enhanced power conversion efficiency in high power single spatial mode ridge waveguide diode lasers using extreme triple asymmetric epitaxial structure

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  • 发表日期：

    2025年10月22日

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  • Xiaolei Zhao,
  • Lance Sweatt,
  • Taylor Levaur,
  • Lin Zhu

摘要

Single-spatial-mode lasers with high efficiency and watt-level output in the 97x-nm wavelength range are in strong demand for a variety of applications. In this work, we explore ridge waveguide (RW) lasers based on an Extreme Triple Asymmetric (ETAS) epitaxial structure. Through optimized epitaxial design, the conversion efficiency of our ETAS-based ridge lasers is improved by over 12% at high powers compared to our prior designs using an Extreme Double Asymmetric (EDAS) structure. A 7-µm ridge-width ETAS-based laser with an antireflection (AR) coating of Rf = 2% and a high reflection (HR) coating of Rr = 95% achieves single-spatial-mode operation, delivering a peak efficiency of 61.2% at 1 W output and sustaining 60.1% efficiency at 1.41 W output under 1.5 A drive current. Reducing AR coating reflectivity (Rf = 0.5%) enhances beam quality, achieving near-diffraction-limited single-mode emission with M2 1/e values maintained below 1.15 up to a drive current of 1.45 A. These results highlight the potential of ETAS-based lasers for high-performance applications requiring high-power high-efficiency single-spatial-mode lasing emissions.