研究目的
To rationalize both near-infrared and mid-infrared spontaneous emission in Pr3+ doped selenide-chalcogenide fiber through experimental and numerical investigations.
研究成果
The numerical simulations agree with experimental results, identifying dominant electronic transitions contributing to photoluminescence. The MIR luminescence lifetime is shorter than expected from Judd-Ofelt analysis due to contributions from multiple transitions. The study provides insights for developing mid-infrared fiber sources.
研究不足
The analysis is complicated by overlapping transitions, small energy gaps between manifolds, potential extrinsic absorption from contamination, and limitations in detector bandwidth and accuracy of multi-phonon rate calculations.
1：Experimental Design and Method Selection:
The study combines experimental measurements of photoluminescence spectra and decay with numerical modeling using rate equations to analyze radiative transitions in Pr3+ doped chalcogenide-selenide fiber.
2：Sample Selection and Data Sources:
A 500 ppmw Pr3+ doped GeAsGaSe bulk glass fiber sample was fabricated via melt-quenching and drawn into a step-index fiber with specific dimensions.
3：List of Experimental Equipment and Materials:
Equipment includes a monochromator, MCT photodetector (PVI-4TE6, Vigo Systems), lock-in amplifier, oscilloscope, laser diode pump at 1450 nm, spectrum analyzer (Yokogawa AQ6370D), and various filters and lenses. Materials include purified elements (As, Se, Ge, Ga, Pr) and silica-glass ampoules.
4：Experimental Procedures and Operational Workflow:
Photoluminescence spectra were recorded by pumping one end of the fiber and collecting light from the other end, using detectors for different wavelength ranges (NIR and MIR). Decay curves were measured by modulating the pump laser and averaging signals to reduce noise.
5：Data Analysis Methods:
Numerical analysis involved solving rate equations to calculate level populations and lifetimes, with parameters from literature, and fitting experimental data with exponential functions.
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spectrum analyzer
AQ6370D
Yokogawa
Records near-infrared photoluminescent spectrum.
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MCT photodetector
PVI-4TE6
Vigo Systems
Records mid-infrared light intensity in photoluminescence measurements.
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laser diode
Provides pump light at 1450 nm for exciting the fiber.
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monochromator
Used to disperse and measure light spectra.
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lock-in amplifier
Improves signal-to-noise ratio in measurements.
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oscilloscope
Records and analyzes electrical signals from detectors.
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resistance furnace
Instron
Used for melting and annealing glass samples.
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fiber drawing tower
Heathway
Draws the preform into fiber.
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glove-box
MBraun
Provides controlled environment for batching materials.
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