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Abstract
In this Letter, we report lasing at 2.3 µm in ${\text{Tm}^{3 +}}$-single-doped and ${\text{Tm}^{3 +}}/{\text{Ho}^{3 +}}$-codoped fluorotellurite glass microsphere resonators. By employing a 793 nm diode laser as a pump and exploiting whispering gallery mode microresonators (WGMRs), dual-wavelength lasing at 1.9 and 2.3 µm and triple-wavelength lasing at 1.9, 2.07, and 2.3 µm are achieved in ${\text{Tm}^{3 +}}$-doped and ${\text{Tm}^{3 +}}/{\text{Ho}^{3 +}}$-codoped microspheres, respectively. The introduction of ${\text{Ho}^{3 +}}$ ions significantly reduces the lasing threshold of ${\text{Tm}^{3 +}}$ at 2.3 µm because of energy transfer.
© 2020 Optical Society of America
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