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Third Law of Thermodynamics

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Temperature resolved decay time components of Mg₄FGeO₆:Mn using the maximum entropy method.

Henrik Feuk¹, Sebastian Nilsson¹, Mattias Richter¹

¹Combustion Physics, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.

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|April 4, 2023

Summary

The Maximum Entropy Method (MEM) analyzes thermographic phosphor decay time distributions for accurate temperature measurements. This advanced technique reveals multiple decay components, improving thermometry by overcoming limitations of traditional fitting methods.

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Last Updated: Aug 4, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Area of Science:

Materials Science
Spectroscopy
Physical Chemistry

Background:

Thermographic phosphors are crucial for non-contact temperature measurements.
Phosphor luminescence decay often exhibits complex multi-exponential behavior.
Traditional fitting methods struggle to accurately represent multi-component decays.

Purpose of the Study:

To apply the Maximum Entropy Method (MEM) for analyzing thermographic phosphor decay time distributions.
To investigate the utility of MEM-derived distributions for thermometry.
To demonstrate MEM's capability in resolving complex decay characteristics.

Main Methods:

Utilized the Maximum Entropy Method (MEM) to retrieve decay time distributions.
Analyzed the temperature-dependent peak shifts in decay time distributions.
Performed calibration experiments to account for background luminescence.

Main Results:

MEM successfully resolved decay time distributions, revealing multiple contributing components.
Peak locations in the distribution showed temperature sensitivity, suitable for thermometry.
The method demonstrated robustness against multi-exponential decay characteristics.
MEM was shown to simultaneously characterize luminescence from two distinct sources.

Conclusions:

MEM provides a powerful tool for analyzing complex phosphor decay kinetics.
MEM-based thermometry offers advantages over traditional methods, especially for multi-exponential decays.
The technique enhances understanding of phosphor lifetime behavior and its temperature dependence.