Fabrication, microstructure, spectral properties, and laser performance of Yb:GdxY3-xAl5O12 ceramics

Year: 2024

Authors: Feng YG., Liu ZY., Toci G., Pirri A., Patrizi B., Vannini M., Hreniak D., Li J.

Autors Affiliation: Chinese Acad Sci, Shanghai Inst Ceram, Transparent Ceram Res Ctr, Shanghai 201899, Peoples R China; Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing, Peoples R China; Henan Univ Technol, Sch Mat Sci & Engn, Zhengzhou, Henan, Peoples R China; Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China; CNR INO, Ist Nazl Ott, Consiglio Nazl Ric, Sesto Fiorentino, FI, Italy; CNR, Ist Fis Applicata Carrara, NR IFAC, Sesto Fiorentino, FI, Italy; Polish Acad Sci, Inst Low Temp & Struct Res, Wroclaw, Poland.

Abstract: Highly transparent 10 at.% Yb:GdxY3-xAl5O12 (x = 0.3, 0.5, and 0.7) ceramics were successfully fabricated by vacuum solid-state reactive sintering at 1800 degrees C for 20 h combined with hot isostatic pressing posttreatment at 1700 degrees C for 3 h under 176 MPa pressure in Ar atmosphere. The in-line transmittances of these ceramics with the thickness of 2.5 mm are 84.4%, 84.0%, and 83.5% at 1100 nm for x = 0.3, 0.5, and 0.7, respectively. The relationships of the Gd3+ content among the phase, microstructures, spectral, and laser properties of the Yb:GdxY3-xAl5O12 ceramics were elucidated in detail. The introduction of Gd3+ has a little influence on the crystal field strength of the Yb3+ sites in GdxY3-xAl5O12. The absorption, emission spectra, and fluorescence lifetime of the Yb3+ in these ceramics are similar, close to 10 at.% Yb:YAG ceramics. Quasi-continuous wave laser outputs of the ceramics were also achieved. The maximum laser output powers are 7.8, 7.7, and 6.6 W with the corresponding slope efficiency as 46.2%, 44.7%, and 39.2% for x = 0.3, 0.5, and 0.7, respectively. The 7.8 W laser output power is the highest value achieved so far for the Yb:GdYAG ceramics, to the best of our knowledge. The previous discussions show that not all the mixed garnets could enhance full width at half maximum of absorption and emission peaks for the active ions; however, the Yb:GdYAG ceramics are still excellent laser gain media.

Journal/Review: JOURNAL OF THE AMERICAN CERAMIC SOCIETY

Volume: 107 (6)      Pages from: 4134  to: 4146

More Information: This work was supported by the National Key R&D Program of China (Grant Nos. 2021YFE0104800 and 2023YFB3812000), the International Partnership Program of Chinese Academy of Sciences (Grant No. 121631KYSB20200039), and the International Cooperation Project of Shanghai Science and Technology Commission (Grant No. 20520750200). The activity was also partially supported by the National Centre for Research and Development (Contract No. WPC2/1/SCAPOL/2021). This work was also supported by the Joint Research Project between Chinese Academy of Sciences and National Research Council (CAS-CNR) 2020-2022, the Doctoral Fund of Henan University of Technology (Grant No. 2020BS065), and Project of Henan Science and Technology Research Program in 2023 (Grant No. 232102230111).
KeyWords: laser performance; mixed garnet; optical properties; transparent ceramics; Yb:GdYAG
DOI: 10.1111/jace.19711

Citations: 1
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