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Purpose <p>Spin-exchange optical pumping (SEOP) is a widely used technique for polarizing 3He and 129Xe using alkali metal vapors.&#xa0;To achieve the optimal pumping performance, the pump laser must deliver high stability, high output power, and narrow spectral&#xa0;linewidth to match the absorption of alkali metal vapor.</p> Methods <p>In this work, the development of the optical, control system and mechanical packaging for SEOP pump laser at 795 nm was&#xa0;presented. This laser system enables tunable (794.6-794.9 nm), high-power (120 W), narrow-linewidth (~0.2 nm) output with&#xa0;integrated four bars and volume Bragg gratings (VBG), which can be adjusted to designated wavelengths.</p> Results <p>This laser system was commissioned on the pumping station, and the 3He polarization ＞63% was calibrated on neutron beamline.</p> Conclusion <p>The laser can provide an alternative option for scientific investigations in hyperpolarizing noble gases, and industrial&#xa0;applications in related areas.</p>

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Development of 120 W high-power narrow-linewidth 795-nm laser for spin-exchange optical pumping at China spallation neutron source

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Yunfei Li,
  • Yiming Xiong,
  • Jian Tang,
  • Qingbo Zheng,
  • Xu Qin,
  • Yuan Yao,
  • Yujie Zheng,
  • Zecong Qin,
  • Dongbing He,
  • Junpei Zhang,
  • Xin Tong

摘要

Purpose

Spin-exchange optical pumping (SEOP) is a widely used technique for polarizing 3He and 129Xe using alkali metal vapors. To achieve the optimal pumping performance, the pump laser must deliver high stability, high output power, and narrow spectral linewidth to match the absorption of alkali metal vapor.

Methods

In this work, the development of the optical, control system and mechanical packaging for SEOP pump laser at 795 nm was presented. This laser system enables tunable (794.6-794.9 nm), high-power (120 W), narrow-linewidth (~0.2 nm) output with integrated four bars and volume Bragg gratings (VBG), which can be adjusted to designated wavelengths.

Results

This laser system was commissioned on the pumping station, and the 3He polarization ＞63% was calibrated on neutron beamline.

Conclusion

The laser can provide an alternative option for scientific investigations in hyperpolarizing noble gases, and industrial applications in related areas.