Abstract

${{\rm Pr}^{3 +}}/{{\rm Yb}^{3 +}}$ co-doped fluoroindate (${{\rm InF}_3}$) glasses were prepared by using a traditional melt-quenching method in dry ${{\rm N}_2}$ atmosphere. Pumped by a 976 or 1570 nm laser diode, efficient emissions at ${\sim}{4}\;\unicode{x00B5}{\rm m}$ were obtained from the ${{\rm Pr}^{3 +}}/{{\rm Yb}^{3 +}}$ co-doped glasses, which could be ascribed to the transition ${^3{{\rm F}}_4}\; \to {^3{{\rm H}}_6}$ of ${{\rm Pr}^{3 +}}$ ions. The relative stimulated emission cross section was calculated to be ${\sim}{1.44} \times {{10}^{- 24}}\;{{\rm m}^2}$ at 4 µm, which was ${\sim}{4.2}$ times larger than that of transition ${{\rm Ho}^{3 +}}\!:{^5{{\rm I}}_5} \to {^5{{\rm I}}_6}$ (${3.4} \times {{10}^{- 25}}\;{{\rm m}^2}$). In addition, combined with transitions ${^1{{\rm G}}_4} \to {^3{{\rm F}}_3}$ and ${^1{{\rm G}}_4} \to {^3{{\rm F}}_4}$ of ${{\rm Pr}^{3 +}}$ ions, ultra-broadband emission ranging from 2.7 to 4.2 µm was also obtained. Our results indicate that ${{\rm Pr}^{3 +}}/{{\rm Yb}^{3 +}}\!:{\rm InF}_3$ glasses could be used to develop efficient ${\sim}{4}\;\unicode{x00B5}{\rm m}$ lasers and widely tunable mid-infrared lasers.

© 2021 Optical Society of America

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