研究目的
To investigate the fabrication, microstructure, and optical properties of Tm:Y3ScAl4O12 (Tm:YSAG) laser ceramics, and to compare their performance with Tm:Y3Al5O12 ceramics, focusing on the effects of Sc3+ introduction on the energy levels of Tm3+ and the resulting laser performance.
研究成果
Transparent 4 at.% Tm:Y3ScAl4O12 ceramics were successfully fabricated, showing excellent optical properties and the first reported laser output for Tm:YSAG ceramics. The introduction of Sc3+ affects the energy levels of Tm3+, leading to changes in absorption and emission spectra. The study suggests further work to improve the optical properties and laser performance of the ceramics.
研究不足
The study notes that the sintering temperature of 1820 oC is too high for the sintering of the 4 at.% Tm:YSAG ceramics, leading to many cracks. The laser efficiency is relatively low, attributed to poor matching between the pumped volume and the lasing volume, and the need for better optical quality of Tm:YSAG ceramics.
1：Experimental Design and Method Selection:
The Tm:YSAG ceramics were fabricated by solid state reaction combined with vacuum sintering method. Commercial high-purity oxide powders were used as starting materials with TEOS and MgO as sintering aids.
2：Sample Selection and Data Sources:
The study used highly-pure commercial oxide powders (Y2O3, α-Al2O3, Sc2O3, Tm2O3) as starting materials.
3：List of Experimental Equipment and Materials:
Equipment included a ball mill, corundum crucible, UV-VIS-NIR spectrophotometer (Cary-5000, Varian, USA), time resolved spectrometer (FLSP920, Edinburgh instruments, UK), and a laser cavity for testing laser performance.
4：Experimental Procedures and Operational Workflow:
Powders were ball milled, dried, sieved, calcined, pressed into pellets, cold isostatic pressed, sintered in vacuum, annealed in air, and polished for measurements.
5：Data Analysis Methods:
Absorption and emission spectra were analyzed, and laser performance was tested under QCW mode with a 790 nm LD pump.
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Time resolved spectrometer
FLSP920
Edinburgh instruments
Detection of emission spectra and fluorescence decay
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Y2O3
Yuelong New Materials Co., Ltd.
Starting material for fabrication of Tm:YSAG ceramics
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α-Al2O3
HFF-5
Fenghe Ceramics Co., Ltd.
Starting material for fabrication of Tm:YSAG ceramics
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Sc2O3
Jingyun Material Technology Co., Ltd.
Starting material for fabrication of Tm:YSAG ceramics
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Tm2O3
Jianfeng Rare Earth Co., Ltd.
Starting material for fabrication of Tm:YSAG ceramics
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TEOS
Alfa Aesar
Sintering aid
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MgO
Alfa Aesar
Sintering aid
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UV-VIS-NIR spectrophotometer
Cary-5000
Varian
Measurement of in-line transmittance and absorption spectra
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Fiber-coupled laser-diode
Pump source for testing laser performance
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