Spectroscopy and diode-pumped laser operation of transparent Tm:Lu3Al5O12 ceramics produced by solid-state sintering

FANGXIN YUE, PAVEL LOIKO, MENGTING CHEN, JOSEP MARIA SERRES, YICHENG WANG, JIANG LI, LIZA BASYROVA, ELENA DUNINA, ALEXEY KORNIENKO, LIUDMILA FOMICHEVA, SHIBO DAI, ZHENQIANG CHEN, JI EUN BAE, TAE GWAN PARK, FABIAN ROTERMUND, VENKATESAN JAMBUNATHAN, ANTONIO LUCIANETTI, TOMAS MOCEK, MAGDALENA AGUILÓ, FRANCESC DÍAZUWE GRIEBNER, VALENTIN PETROV, XAVIER MATEOS

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Abstract

A transparent Tm:Lu3Al5O12 ceramic is fabricated by solid-state reactive sintering at 1830°C for 30 h using commercial α-Al2O3 and Lu2O3/Tm2O3 powders and sintering aids - MgO and TEOS. The ceramic belongs to the cubic system and exhibits a close-packed structure (mean grain size: 21 μm). The in-line transmission at ∼1 μm is 82.6%, close to the theoretical limit. The spectroscopic properties of the ceramic are studied in detail. The maximum stimulated-emission cross-section is 2.37x10-21 cm2 at 1749nm and the radiative lifetime of the 3F4 state is about 10 ms. The modified Judd-Ofelt theory accounting for configuration interaction is applied to determine the transition probabilities of Tm3+, yielding the intensity parameters 2 = 2.507, 4 = 1.236, 6 = 1.340 [10-20 cm2] and α = 0.196x10-4 cm. The effect of excited configurations on lower-lying interconnected states with the same J quantum number is discussed. First laser operation is achieved under diode-pumping at 792 nm. A 4 at.% Tm:Lu3Al5O12 ceramic laser generated 3.12 W at 2022-2035nm with a slope efficiency of 60.2%. The ceramic is promising for multi-watt lasers at >2 μm.

Original languageEnglish
Pages (from-to)28399-28413
Number of pages15
JournalOptics Express
Volume28
Issue number19
DOIs
StatePublished - Sep 2020
Externally publishedYes

Funding

Ministerio de Economía y Competitividad (MAT2016-75716-C2-1-R (AEI/FEDER, UE)); Agència de Gestió d’Ajuts Universitaris i de Recerca (2017SGR755); Horizon 2020 Framework Programme (grant agreement No. 739573); European Regional Development Fund (Grant No. CZ.02.1.01/0.0/0.0/15_006/0000674); Ministerstvo Školství, Mládeže a Tělovýchovy (Large Research Infras. Project No. LM2015086, NPU I Project No. LO1602); Chinese Academy of Sciences Key Project (QYZDB-SSW-JSC022).

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