Spectroscopic and laser properties of Er3+, Pr3+ co-doped LiYF4 crystal

Zhengda Sun; Feifei Wang; Haiping Xia; Hongkun Nie; Kejian Yang; Ruihua Wang; Jingliang He; Baitao Zhang

doi:10.3788/COL202119.081404

Abstract

In this paper, the absorption and fluorescence spectra of

{Er}^{3 +}

,

\Pr^{3 +}

co-doped

{LiYF}_{4}

(Er,Pr:YLF) crystal were measured and analyzed. The

\Pr^{3 +}

co-doping was proved to effectively enhance the

{Er}^{3 +} : {{}^{4}I}_{11 / 2} \to {{}^{4}I}_{13 / 2}

mid-infrared transition at the 2.7 μm with 74.1% energy transfer efficiency from

{Er}^{3 +} : {{}^{4}I}_{13 / 2}

to

\Pr^{3 +} : {{}^{3}F}_{4}

. By using the Judd–Ofelt theory, the stimulated emission cross section was calculated to be

1.834 \times 10^{- 20} {cm}^{2}

at 2685 nm and

1.359 \times 10^{- 20} {cm}^{2}

at 2804.6 nm. Moreover, a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time, to the best of our knowledge. The maximum output power was determined to be 258 mW with a slope efficiency of 7.4%, and the corresponding beam quality factors

M_{x}^{2} = 1.29

and

M_{y}^{2} = 1.25

. Our results suggest that Er,Pr:YLF should be a promising material for 2.7 μm laser generation.

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