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High-efficiency Er-doped yttrium gallium garnet laser resonantly pumped by a laser diode at 1.47 µm

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Abstract

The spectroscopic and laser properties of an ${{\rm{Er}}^{3 +}}$-doped yttrium gallium garnet crystal, ${{\rm{Y}}_3}{{\rm{Ga}}_5}{{\rm{O}}_{12}}$ (YGG), are studied. The stimulated emission cross section is ${1.4} \times {{10}^{- 21}}\;{\rm{cm}}^2$ at 1.65 µm. A continuous-wave laser resonantly pumped by a laser diode at 1.47 µm is demonstrated, delivering a maximum output power of 3.34 W. Benefiting from the low phonon energy of the YGG host, the corresponding slope efficiency is as high as ${\sim}{{42}}\%$. To the best of our knowledge, this is the highest slope efficiency from the laser-diode resonantly pumped Er lasers at room temperature in the 1.6 µm spectral range.

© 2020 Optical Society of America

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