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Growth, spectral and laser properties of Nd3+:Na2La4(WO4)7 crystal

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Abstract

A Nd3+:Na2La4(WO4)7 crystal with dimensions of ϕ 17 × 30 mm3 was grown by the Czochralski method. The thermal expansion coefficients of Nd3+:Na2La4(WO4)7 crystal are 1.32 × 10−5 K−1 along c-axis and 1.23 × 10−5 K−1 along a-axis, respectively. The spectroscopic characteristics of Nd3+:Na2La4(WO4)7 crystal were investigated. The Judd–Ofelt theory was applied to calculate the spectral parameters. The absorption cross sections at 805 nm are 2.17 × 10−20 cm2 with a full width at half maximum (FWHM) of 15 nm for π-polarization, and 2.29 × 10−20 cm2 with a FWHM of 14 nm for σ-polarization. The emission cross sections are 3.19 × 10−20 cm2 for σ-polarization and 2.67 × 10−20 cm2 for π-polarization at 1,064 nm. The fluorescence quantum efficiency is 67 %. The quasi-cw laser of Nd3+:Na2La4(WO4)7 crystal was performed. The maximum output power is 80 mW. The slope efficiency is 7.12 %. The results suggest Nd3+:Na2La4(WO4)7 crystal as a promising laser crystal fit for laser diode pumping.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (61275177, 61108054, 51302260), the National Natural Science Foundation of Fujian Province (2011J01376, 2012I0011) and Scientific Research Foundation for Returned Scholars, Ministry of Education of China, respectively.

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Correspondence to Zhoubin Lin or Guofu Wang.

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Yu, Y., Huang, Y., Zhang, L. et al. Growth, spectral and laser properties of Nd3+:Na2La4(WO4)7 crystal. Appl. Phys. B 116, 69–74 (2014). https://doi.org/10.1007/s00340-013-5649-1

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  • DOI: https://doi.org/10.1007/s00340-013-5649-1

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