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<p>This paper presents the design, fabrication, and implementation of a single-layer resonant-reflection grating-waveguide structure (RR-GWS) optimized for laser operation in the 2&#xa0;μm wavelength region. The RR-GWS was designed to function effectively across a broad spectral region ranging from 1.9&#xa0;μm to 2.1&#xa0;μm. Reflectance measurements confirmed the structure’s wideband performance within this spectral region, with 99% resonant reflectivity. Incorporating the RR-GWS into a Ho: YAG thin-disk laser system, as a cavity folding mirror, it demonstrated very good power-handling capability and efficacy in wavelength and polarization selection. The 2&#xa0;μm laser system achieved a linearly polarized output power of 36&#xa0;W, with an optical efficiency of 34.6%. Additionally, the laser demonstrated a spectral bandwidth of &lt; 0.5&#xa0;nm full width at half maximum, i.e., 12 times narrower than that obtained with an equivalent all-mirror reference cavity.</p>

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Resonant grating for wavelength and polarization selection in high-power lasers emitting in the 2-µm wavelength region

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月24日

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  • Danish Bashir,
  • Georgia Mourkioti,
  • Ayoub Boubekraoui,
  • Sergei Tomilov,
  • Mykyta Redkin,
  • Clara J. Saraceno,
  • Thomas Graf,
  • Jacob I. Mackenzie,
  • Marwan Abdou Ahmed

摘要

This paper presents the design, fabrication, and implementation of a single-layer resonant-reflection grating-waveguide structure (RR-GWS) optimized for laser operation in the 2 μm wavelength region. The RR-GWS was designed to function effectively across a broad spectral region ranging from 1.9 μm to 2.1 μm. Reflectance measurements confirmed the structure’s wideband performance within this spectral region, with 99% resonant reflectivity. Incorporating the RR-GWS into a Ho: YAG thin-disk laser system, as a cavity folding mirror, it demonstrated very good power-handling capability and efficacy in wavelength and polarization selection. The 2 μm laser system achieved a linearly polarized output power of 36 W, with an optical efficiency of 34.6%. Additionally, the laser demonstrated a spectral bandwidth of < 0.5 nm full width at half maximum, i.e., 12 times narrower than that obtained with an equivalent all-mirror reference cavity.