研究目的
To study the optical and spectroscopic properties of Er3+/Pr3+-codoped Gd3Ga5O12 crystal, including Judd-Ofelt analysis and refractive index measurement, to understand the effects of Pr3+ codoping on Er3+ properties and correct the Sellmeier equation.
研究成果
Pr3+ codoping in Gd3Ga5O12 crystal significantly alters Er3+ spectroscopic properties, increasing Judd-Ofelt parameters by nearly an order of magnitude, leading to shorter radiative and fluorescence lifetimes. This enables potential Er3+ lasing at 2700 nm due to resonant energy transfer processes. The corrected Sellmeier equation is provided for the codoped crystal.
研究不足
The study focuses only on Er3+ spectroscopic properties; Judd-Ofelt analysis for Pr3+ was not possible due to overlapping absorption bands with Er3+, limiting a comprehensive analysis of Pr3+ characteristics. Measurement errors and uncertainties in parameters (e.g., refractive index uncertainty up to 7 × 10^-3) may affect accuracy.
1：Experimental Design and Method Selection:
The study involved growing an Er3+/Pr3+-codoped Gd3Ga5O12 single-crystal using the Czochralski method, measuring its absorption spectrum and refractive index, and performing Judd-Ofelt analysis based on the measured data.
2：Sample Selection and Data Sources:
A thin crystal plate with dimensions
3：2 × 4 × 5 mm3 was used, with Er3+ and Pr3+ concentrations determined by inductively coupled plasma atomic emission spectrometry. List of Experimental Equipment and Materials:
Equipment included a Metricon 2010 prism coupler for refractive index measurements and a U-4100 spectrophotometer for absorption spectrum measurements.
4：Experimental Procedures and Operational Workflow:
Refractive indices were measured at wavelengths of 473,
5：8, 1311, and 1553 nm using the prism coupler. The absorption spectrum was measured at room temperature with a sampling interval of 5 nm, scanning speed of 300 nm/min, and range of 200-3300 nm. Data Analysis Methods:
6 Judd-Ofelt parameters were derived from the absorption data using least squares fitting, and the Sellmeier equation was refined based on refractive index measurements.
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