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<p>We demonstrate, for the first time, a continuous-wave (CW) Nd:NLW laser that is switchable between single- and dual-wavelength operation on the <sup>4</sup>F<sub>3/2</sub> → <sup>4</sup>I<sub>13/2</sub> transition. By rotating the birefringent filter (BF), the laser output can be switched between two single-wavelength operations (at 1340&#xa0;nm and 1381&#xa0;nm) and a dual-wavelength operation (at 1340/1381&#xa0;nm). For the single-wavelength operations at 1340&#xa0;nm and 1381&#xa0;nm under 20 W of 808&#xa0;nm pumping, the maximum output powers were measured to be 5.08 W and 3.64 W, corresponding to slope efficiencies of 25.4% and 20.5%, respectively. The dual-wavelength laser reached a maximum total output power of 2.52 W, with an optical conversion efficiency of 12.6%. This performance was achieved by an optimal output coupler design and precise BF rotation, which enabled a stable power balance between the two wavelengths across the entire pump power range.</p>

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Switchable single/dual-wavelength operation of a diode-pumped Nd:NLW laser on the 4F3/2→4I13/2 transition

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Chu Chu,
  • Shuang Wang,
  • Baozeng Li,
  • Zhenhua Du

摘要

We demonstrate, for the first time, a continuous-wave (CW) Nd:NLW laser that is switchable between single- and dual-wavelength operation on the 4F3/2 → 4I13/2 transition. By rotating the birefringent filter (BF), the laser output can be switched between two single-wavelength operations (at 1340 nm and 1381 nm) and a dual-wavelength operation (at 1340/1381 nm). For the single-wavelength operations at 1340 nm and 1381 nm under 20 W of 808 nm pumping, the maximum output powers were measured to be 5.08 W and 3.64 W, corresponding to slope efficiencies of 25.4% and 20.5%, respectively. The dual-wavelength laser reached a maximum total output power of 2.52 W, with an optical conversion efficiency of 12.6%. This performance was achieved by an optimal output coupler design and precise BF rotation, which enabled a stable power balance between the two wavelengths across the entire pump power range.