研究目的
Investigating the crystal growth and spectroscopic properties of Dy:YAlO3 and Dy,Tm:YAlO3 crystals for mid-infrared laser applications around 3 μm.
研究成果
The introduction of Tm3+ ions to Dy3+:YAP crystal significantly improves the spectral properties, making Dy3+,Tm3+:YAP crystal a promising medium for 3 μm laser operation under 795 nm excitation. The energy transfer mechanisms between Dy3+ and Tm3+ ions were effectively analyzed, showing higher values of microscopic energy transfer constants.
研究不足
The study is limited by the weak absorption cross-section of Dy3+ ion around 800 nm in Dy3+:YAP crystal, making it unsuitable for direct pumping under 800 nm excitation. The upconversion emission observed in Dy3+:YAP crystal under 802 nm excitation also indicates potential inefficiencies for certain applications.
1：Experimental Design and Method Selection:
The study involved the synthesis of Dy3+:YAP and Dy3+,Tm3+:YAP single crystals using the Czochralski (CZ) method. The optical absorption and emission features were studied in detail.
2：Sample Selection and Data Sources:
Commercial available Dy2O3, Tm2O3, Y2O3, and Al2O3 powders (purity: 4N) were used as raw materials. The crystals were grown under high purity nitrogen atmosphere.
3：List of Experimental Equipment and Materials:
Perkin-Elmer UV-VIS-NIR spectrometer (Lambda 950) for polarized absorption spectra, Fluorescence FLS920 spectrometer for fluorescence spectra and time-resolved decay curves, and FLS980 spectrometer with 795 nm xenon pumping.
4：Experimental Procedures and Operational Workflow:
The crystals were grown using CZ method with specific pulling and rotation rates. The temperature was reduced slowly to room temperature after growth. The wafers were cut and polished for spectral measurements.
5：Data Analysis Methods:
The absorption and emission cross-sections were calculated using specific formulae. The energy transfer mechanisms and micro-parameters were discussed based on the measured spectra.
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