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<p>We demonstrate for the first time a diode-pumped continuous-wave (CW) wavelength-switchable quasi-three-level Nd: LiYF<sub>4</sub> (Nd: YLF) laser on the <sup>4</sup>F<sub>3/2</sub>→<sup>4</sup>I<sub>9/2</sub> transition. By adjusting the position of the pump beam waist inside the gain medium, the laser operation can be switched between single- wavelength (SW) and dual-wavelength (DW) modes. For the π-polarized SW emission at 908&#xa0;nm, a maximum output power of 3.22&#xa0;W was achieved, with a slope efficiency of 21.1% relative to the absorbed pump power. For the orthogonally polarized DW operation at 903&#xa0;nm and 908&#xa0;nm, the total output power reached 2.25&#xa0;W, corresponding to an optical conversion efficiency of 13.3%. Additionally, the σ-polarized SW lasing at 903&#xa0;nm yielded up to 2.27&#xa0;W. This wavelength-switching method, which requires no additional intracavity elements, offers a promising approach for developing high-power solid-state lasers with flexible wavelength control.</p>

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Switching single and dual wavelength emission in a quasi-three-level Nd: YLF laser by adjusting pump beam waist position

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月28日

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  • Haotian Huang,
  • Yuzhao Li,
  • Jing Xia,
  • Zhenhua Du,
  • Xinhua Fu,
  • Yanfei Lü

摘要

We demonstrate for the first time a diode-pumped continuous-wave (CW) wavelength-switchable quasi-three-level Nd: LiYF4 (Nd: YLF) laser on the 4F3/2→4I9/2 transition. By adjusting the position of the pump beam waist inside the gain medium, the laser operation can be switched between single- wavelength (SW) and dual-wavelength (DW) modes. For the π-polarized SW emission at 908 nm, a maximum output power of 3.22 W was achieved, with a slope efficiency of 21.1% relative to the absorbed pump power. For the orthogonally polarized DW operation at 903 nm and 908 nm, the total output power reached 2.25 W, corresponding to an optical conversion efficiency of 13.3%. Additionally, the σ-polarized SW lasing at 903 nm yielded up to 2.27 W. This wavelength-switching method, which requires no additional intracavity elements, offers a promising approach for developing high-power solid-state lasers with flexible wavelength control.