AI Article Synopsis
- - The study measured the rise and decay of Er3+ 4F9/2 upconversion emission in a specific type of glass using an 808 nm laser diode to understand the excitation process.
- - Researchers determined the lifetime of an intermediate state by analyzing the rise times and confirmed how the population of the 4F9/2 state accumulates.
- - The findings suggest that square wave excitation can be a useful method for measuring the lifetimes of infrared energy levels with traditional photomultiplier tubes.
Article Abstract
The rise and decay curves of Er3+ 4F9/2 upconversion emission in oxyfluoride tellurite glass were measured under the excitation at 808 nm from a laser diode driven by square waves. The lifetime of the intermediate state could be determined via rise times. Then the accumulation process of the 4F9/2 population was confirmed. The excitation mechanism of up-conversion red emission under 808 nm excitation was confirmed by the rate equations and analyzing the relationship between the time constants of the rise and decay processes and the intermediate state. Square wave excited upconversion emission may also be used for measuring lifetimes of infrared energy levels with a conventional photomultiplier tube.
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