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Optical-fiber temperature sensor based on upconversion-excited fluorescence
Optics Letters
|September 23, 2009
Summary
Codoping heavy-metal fluoride glass with erbium and ytterbium enables infrared laser excitation of visible fluorescence. The intensity ratio of these fluorescence lines changes with temperature, offering a potential thermometer.
Area of Science:
- Materials Science
- Optics
- Spectroscopy
Background:
- Rare-earth ion-doped glasses are crucial for optical applications.
- Upconversion luminescence allows conversion of lower-energy photons to higher-energy ones.
- Temperature-dependent optical properties are valuable for sensing applications.
Purpose of the Study:
- To investigate the upconversion luminescence of codoped heavy-metal fluoride glass.
- To explore the temperature-sensing potential of the observed fluorescence lines.
Main Methods:
- Codoping a heavy-metal fluoride glass with erbium (Er) and ytterbium (Yb) ions.
- Excitation using a semiconductor laser in the infrared region.
- Analysis of the upconversion-induced visible fluorescence spectra.
Main Results:
- Observed two neighboring visible fluorescence lines from erbium ions due to upconversion.
- Demonstrated that the intensity ratio of these fluorescence lines is a function of temperature.
- Established a single-variable relationship between the intensity ratio and temperature.
Conclusions:
- Codoped heavy-metal fluoride glass exhibits temperature-sensitive upconversion luminescence.
- This material system shows promise for optical thermometry applications.
- The observed phenomenon provides a novel method for non-contact temperature measurement.
