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Evaluation of a high accuracy reflectometer for specular materials.
Applied Optics
|February 4, 2010
Summary
This study introduces a high-accuracy method for spectral reflectivity measurements of specular materials. The developed reflectometer achieves precision up to 1 part in 10^3, crucial for laser mirror coatings.
Area of Science:
- Optical Physics
- Materials Science
Background:
- Accurate spectral reflectivity measurements are vital for advanced optical coatings.
- Existing instruments may have limitations in precision and wavelength range.
Purpose of the Study:
- To describe a high-accuracy method for measuring spectral reflectivity.
- To evaluate the performance of a novel reflectometer.
- To compare results with established instruments.
Main Methods:
- Development of a new reflectometer based on the Bennett-Koehler instrument.
- Measurement of spectral reflectivity across the 0.300-15.0-micrometer wavelength range.
- Evaluation of systematic errors, including sample tilt, detector linearity, optical configuration, and bandwidth.
Main Results:
- The reflectometer demonstrates high accuracy for spectral reflectivity measurements.
- Results for an evaporated aluminum film show good agreement with the Bennett-Koehler instrument.
- Accuracies of 1 part in 10^3 are achievable for highly reflecting materials.
Conclusions:
- The developed reflectometer offers a significant advancement in measuring spectral reflectivity.
- This method is particularly suitable for materials used in laser mirror coatings.
- Understanding measurement influences is key to achieving high accuracy.
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