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Spectrally combined blue diode lasers pumping a Pr3+:YLF crystal

YU LIU1, XINGYU CUI1, HONG LEI1,2,3, QIANG LI1,2,3, ZHANDA ZHU1,2,3,*

Affiliation

  1. Institute of Laser Engineering, School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
  2. Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing 100124, China
  3. Beijing Engineering Research Center of Laser Technology, Beijing 100124, China

Abstract

To achieve higher-power visible laser output from a Pr3+:YLF crystal, we introduced, for the first time, spectral beam combination of blue laser diodes to overcome individual diode power limitations. By optimizing key parameters including the output mirror's transmittance and curvature, a maximum output power of 7.95 W at 639.5 nm was obtained under 20 W of pump power, corresponding to an optical-to-optical efficiency of 42.31%. This demonstrates the feasibility of scaling visible laser power using Pr³⁺:YLF crystals pumped by spectrally combined blue diodes.

Keywords

Blue laser diodes, Spectral beam combining, Pr3+:YLF, Visible lasers.

Citation

YU LIU, XINGYU CUI, HONG LEI, QIANG LI, ZHANDA ZHU, Spectrally combined blue diode lasers pumping a Pr3+:YLF crystal, Optoelectronics and Advanced Materials - Rapid Communications, 20, 5-6, May-June 2026, pp.195-199 (2026).

Submitted at: Jan. 30, 2026

Accepted at: June 2, 2026