Fluoride crystal-based direct AlGaAs diode-pumped 2.1um laser

H. Z. Huang; H. C. Wu; W. Weng; H. G. Liu; Y. Ge; J. H. Li; W. X. Lin

doi:10.1117/12.2597337

9 October 2021 Fluoride crystal-based direct AlGaAs diode-pumped 2.1μm laser

H. Z. Huang, H. C. Wu, W. Weng, H. G. Liu, Y. Ge, J. H. Li, W. X. Lin

Proceedings Volume 11890, Advanced Lasers, High-Power Lasers, and Applications XII; 118900D (2021) https://doi.org/10.1117/12.2597337
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Abstract

We present a compact diode-pumped Tm/Ho:YLF laser, via integrating the Tm-doped and Ho-doped YLF crystals into a single bulk gain medium. Gain spectral model was developed first to the predict the potential Tm:YLF laser wavelength using different types of output coupling, for enhancing resonant absorption of the Ho:YLF crystal. Further verification were carried out by intra-cavity pumping the Ho:YLF laser with a Tm:YLF laser, where maximum output power of 11.3 W at 2.06 μm with near diffraction limited beam quality was obtained with conversion efficiency of 28.2% by considering the incident 793 nm diode power. In the Tm/Ho:YLF laser, maximum output power of 10.2 W at 2063 nm with power instability of 0.55% was obtained, corresponding to a slope efficiency of 29.6 % and optical conversion efficiency of 25.5%. The results provide a compact, accessible, and efficient Ho laser scheme, with has potential applications in wind lidar, surgeries, material processing, and nonlinear frequency conversion toward the mid-infrared region.

Citation Download Citation

H. Z. Huang, H. C. Wu, W. Weng, H. G. Liu, Y. Ge, J. H. Li, and W. X. Lin "Fluoride crystal-based direct AlGaAs diode-pumped 2.1μm laser", Proc. SPIE 11890, Advanced Lasers, High-Power Lasers, and Applications XII, 118900D (9 October 2021); https://doi.org/10.1117/12.2597337

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KEYWORDS

Crystals

Laser crystals

Holmium

Thulium

Absorption

Polarization

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