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Characterization of upconversion coefficient in erbium-doped materials.
Victor Lopez1, Gonzalo Paez, Marija Strojnik
1Centro de Investigaciones en Optica, Guanajuato, Mexico. vlopez@cio.mx
Optics Letters
|May 12, 2006
Summary
A new, accurate method determines the homogeneous upconversion coefficient using just three measurements, simplifying the study of erbium-doped materials for lasers and optical amplifiers.
Area of Science:
- Materials Science
- Optics
- Spectroscopy
Background:
- Accurate characterization of doped materials is crucial for laser and optical amplifier performance.
- Traditional methods for determining the homogeneous upconversion coefficient can be complex and require numerous measurements.
Purpose of the Study:
- To introduce a simplified and more accurate method for determining the homogeneous upconversion coefficient.
- To reduce the number of required measurements and experimental complexity.
Main Methods:
- Utilizes three key measurements: two time-resolved fluorescence decays and normalized fluorescence versus excitation power.
- Eliminates the need for determining absorption cross-section, pumping source emission spectrum, and spatial power distribution.
- Employs a single experimental setup with adjustable pumping conditions and dual-function fitting.
Main Results:
- Achieves increased accuracy with a reduced number of measurements.
- Minimizes uncertainty and error propagation through dual-function fitting.
- Provides a streamlined approach to coefficient determination.
Conclusions:
- The new method offers a more efficient and accurate way to characterize homogeneous upconversion.
- This technique is highly applicable to erbium-doped materials essential for lasers and optical amplifiers.
- Precise knowledge of efficiency and losses in these materials is significantly improved.