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

Author:

Feng Yagang123ORCID,Liu Ziyu14ORCID,Toci Guido5ORCID,Pirri Angela6,Patrizi Barbara5,Vannini Matteo5,Hreniak Dariusz7,Li Jiang12ORCID

Affiliation:

1. Transparent Ceramics Research Center Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China

2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China

3. School of Materials Science and Engineering Henan University of Technology Zhengzhou Henan China

4. School of Materials Science and Engineering Changsha University of Science & Technology Changsha Hunan China

5. Istituto Nazionale di Ottica Consiglio Nazionale delle Ricerche CNR‐INO Sesto Fiorentino (Fi) Italy

6. Istituto di Fisica Applicata “Carrara” Consiglio Nazionale delle Ricerche NR‐IFAC Sesto Fiorentino (Fi) Italy

7. Institute of Low Temperature and Structure Research Polish Academy of Sciences Wrocław Poland

Abstract

AbstractHighly 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°C for 20 h combined with hot isostatic pressing posttreatment at 1700°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.

Funder

National Centre for Research and Development

National Center for Research and Development

National Key Research and Development Program of China

Publisher

Wiley

Subject

Materials Chemistry,Ceramics and Composites

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