Growth, Spectroscopic and 1.5 μm Laser Properties of Er3+,Yb3+∶Ba3Gd(PO4)3 Crystals

Abstract

Abstract: Er³⁺,Yb³⁺∶Ba₃Gd(PO₄)₃ crystals with different atomic fractions of Er³⁺ and Yb³⁺, i.e. 1.85%Er,23.95%Yb∶Ba₃Gd(PO₄)₃ and 1.95%Er,55.73%Yb∶Ba₃Gd(PO₄)₃ were successfully grown by the Czochralski method. Room-temperature absorption coefficient spectra, up-conversion fluorescence spectra, emission cross-section spectra, gain cross-section spectra and fluorscence decay curves of the crystals were measured and analyzed. Emission cross-section at peak fluorescence wavelength of 1 537 nm, fluorescence lifetime of the ⁴I_13/2 multiplet of Er³⁺ and Yb³⁺→Er³⁺ energy transfer efficienecy of the 1.85%Er,23.95%Yb∶Ba₃Gd(PO₄)₃ crystal are 0.54×10^-20 cm², 9.9 ms and 90%, respectively, while the above values of the 1.95%Er,55.73%Yb∶Ba₃Gd(PO₄)₃ crystal are 0.58×10^-20 cm², 9.7 ms and 93%, respectively. End-pumped by 975 nm laser diode, 1 567 nm continuous-wave laser with maximum output power of 97 mW and slope efficiency of 27.1% is obtained in the 1.85%Er,23.95%Yb∶Ba₃Gd(PO₄)₃ crystal, while 1 567 nm continuous-wave laser with maximum output power of 93 mW and slope efficiency of 17.1% is obtained in the 1.95%Er,55.73%Yb∶Ba₃Gd(PO₄)₃ crystal.

Key words: eye-safe 1.5 μm laser, laser crystal, Er³⁺,Yb³⁺∶Ba₃Gd(PO₄)₃ crystal, Czochralski method, spectroscopic property, continuous-wave laser performance

CLC Number:

O78
O734

HUANG Jianhua, WU Jie, HUANG Yidong, LIN Yanfu, GONG Xinghong, CHEN Yujin. Growth, Spectroscopic and 1.5 μm Laser Properties of Er³⁺,Yb³⁺∶Ba₃Gd(PO₄)₃ Crystals[J]. Journal of Synthetic Crystals, 2023, 52(7): 1286-1295.

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Growth, Spectroscopic and 1.5 μm Laser Properties of Er³⁺,Yb³⁺∶Ba₃Gd(PO₄)₃ Crystals

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