Abstract
A novel laser crystal of Er3+:Yb3+:GdMgB5O10 with dimension of 26 × 16 × 12 mm3 was grown successfully from K2Mo3O10 flux by the top seeded solution growth method. The thermal diffusivity and specific heat capacity were measured to calculate the thermal conductivity of the crystal. The absorption and fluorescence properties of the crystal at room temperature were investigated in detail. The Judd-Ofelt method was used to analyze the polarized absorption spectra. The emission cross-section of the 4I13/2→4I15/2 transition was calculated by the Füchtbauer-Ladenburg formula and the relevant gain cross-sections were estimated. Continuous-wave laser output of 140 mW at 1569 nm with the slope efficiency of 17.8% was demonstrated in a plano-concave resonator. The results reveal that Er3+:Yb3+:GdMgB5O10 crystal is a promising material for 1.5 μm lasers.
Highlights
The Er3+ and Yb3+ co-doped materials have gained much interest as laser media for emitting eye-safe laser around 1.5 μm, which can be used in many important applications, such as optical communication, environmental sensing, and medical treatments [1,2,3,4]
Many types of laser crystals co-doped with Er3+ and Yb3+ ions have been investigated and have realized 1.5 μm laser operations successfully, such as Y3 Al5 O12, Y2 SiO5, KY(WO4 )2, YVO4, YCa4 O(BO3 )3 and Sr3 Y2 (BO3 )4 [5,6,7,8,9,10,11]
(2.2 and 1.0 WK−1 m−1, respectively) which limit the laser power due to their tendency to crack at high pumping power [12,13]
Summary
The Er3+ and Yb3+ co-doped materials have gained much interest as laser media for emitting eye-safe laser around 1.5 μm, which can be used in many important applications, such as optical communication, environmental sensing, and medical treatments [1,2,3,4]. The main drawback of YCa4 O(BO3 ) and Sr3 Y2 (BO3 ) crystals is their lower thermal conductivities (2.2 and 1.0 WK−1 m−1 , respectively) which limit the laser power due to their tendency to crack at high pumping power [12,13]. The studies of new borate laser crystals with a large thermal conductivity and good optical properties are needed. The Er:Yb:LaMgB5 O10 (LMB) crystal with relatively large thermal conductivity (5.0 WK−1 m−1 ) has been realized in a continuous-wave laser at 1567 nm with maximum output power of 160 mW and a slope efficiency about 10.1% [14].
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