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Glass thickness and index measurement using optical sampling by cavity tuning
Applied Optics
|December 14, 2016
Summary
This study introduces a novel optical sampling method for precise glass characterization. The technique accurately measures glass thickness and refractive index simultaneously using cavity tuning and frequency comb technology.
Area of Science:
- Optics and Photonics
- Materials Science
- Metrology
Background:
- Accurate measurement of glass properties like thickness and refractive index is crucial for various industrial and scientific applications.
- Existing methods may have limitations in accuracy, speed, or simultaneous measurement capabilities.
Purpose of the Study:
- To develop and demonstrate a high-accuracy method for simultaneously measuring glass geometrical thickness, optical thickness, and refractive index.
- To validate the proposed method through comparison with established reference values.
Main Methods:
- Utilizing optical sampling by cavity tuning (OSCT) with a frequency comb.
- Tuning the repetition frequency of the frequency comb to generate cross-correlation patterns.
- Analyzing cross-correlation patterns corresponding to the specimen's surfaces and a reference mirror.
Main Results:
- Achieved high-accuracy measurements of glass geometrical thickness within 1.3 μm of reference values.
- Determined glass refractive index with high precision, showing agreement within 5×10⁻⁴ compared to reference values.
- Demonstrated simultaneous measurement of thickness and refractive index.
Conclusions:
- The optical sampling by cavity tuning method provides a robust and accurate approach for glass metrology.
- This technique offers a significant advancement for non-destructive characterization of optical materials.
- The method's precision supports applications requiring stringent material property control.
