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Comparative study of quantitative phase imaging techniques for refractometry of optical waveguides
Optics Express
|August 19, 2018
Summary
Three quantitative phase imaging techniques accurately measure the refractive index of optical waveguides. These methods offer precise, non-destructive tools for studying waveguide inscription and material photosensitivity.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Quantitative phase imaging (QPI) is crucial for characterizing optical materials.
- Accurate refractometry of optical waveguides is essential for fabrication and performance.
- Evaluating QPI techniques for waveguide analysis is needed.
Purpose of the Study:
- To comparatively study three QPI techniques for optical waveguide refractometry.
- To assess the accuracy, precision, and sensitivity of these methods.
- To map the photosensitivity of Eagle2000 glass to femtosecond laser pulses.
Main Methods:
- Transport-of-intensity equation (TIE) based method.
- Quadri-wave lateral shearing interferometry (QWLSI).
- Digital holographic microscopy (DHM).
Main Results:
- All three QPI techniques demonstrated accurate, repeatable, and sensitive refractive index measurements.
- The refractive index profile of SMF-28 optical fiber was characterized as a benchmark.
- A comprehensive photosensitivity map of Eagle2000 glass was generated.
Conclusions:
- QPI techniques are suitable for precise, non-destructive measurement of refractive index shifts.
- These methods can be used to study and control optical waveguide inscription processes.
- The study validates QPI for advanced optical material characterization.
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