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Simultaneous measurement of refractive index and thickness by combining low-coherence interferometry and confocal optics
Open accessAbstract
We propose and demonstrate novel methods that enable simultaneous measurements of the phase index, the group index, and the geometrical thickness of an optically transparent object by combining optical low-coherence interferometer and confocal optics. The low-coherence interferometer gives information relating the group index with the thickness, while the confocal optics allows access to the phase index related with the thickness of the sample. To relate these, two novel methods were devised. In the first method, the dispersion-induced broadening of the low-coherence envelop signal was utilized, and in the second method the frequency derivative of the phase index was directly obtained by taking the confocal measurements at several wavelengths. The measurements were made with eight different samples; B270, CaF2, two of BK7, two of fused silica, cover glass, and cigarette cover film. The average measurement errors of the first and the second methods were 0.123% and 0.061% in the geometrical thickness, 0.133% and 0.066% in the phase index, and 0.106% and 0.057% in the group index, respectively.
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Self-citationSimultaneous measurement of refractive index and thickness with a convergent beam
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Measurement of the thickness of the lens with the use of all fiber low-coherence interferometer
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Geometrical Thickness Measurement of Thin Films by a Transmitted Gaussian Beam
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Performance of low-coherence and confocal refractometry with reduced index contrast
Francis, D., Hallam, J. M., & Tatam, R. P. (2025) · Optics Express · doi:10.1364/oe.582088
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Spatio-temporal ultrafast laser tailoring for bulk functionalization of transparent materials
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Non-Contact Refractive Index Measurement of Liquid Samples Using Low Coherence Interferometry
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Ren, J., Wei, X., Lu, C., Li, Q., & Zheng, K. (2026) · Journal of Biomedical Optics · doi:10.1117/1.jbo.31.8.086003
Metadata
- Authors
- Kim, S., Na, J., Kim, M. J., & Lee, B. H.
- Affiliations
- Gwangju Institute of Science and Technology (KR)
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2008-04-04
- Volume
- 16
- Issue
- 8
- Pages
- 5516
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W2151863407
- Cited by
- 123
- References
- 11
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 6 · 2023: 6 · 2022: 6 · 2021: 7 · 2020: 6 · 2019: 10 · 2018: 9 · 2017: 13 · 2016: 4 · 2015: 11 · 2014: 8 · 2013: 13 · 2012: 4
- FWCI
- 6.71
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Optical measurement and interference techniques
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Digital Holography and Microscopy
- Physical Sciences › Engineering › Biomedical Engineering › Optical Coherence Tomography Applications
- Keywords
- refractive index measurement, optical thickness measurement, low-coherence interferometry, group index, simultaneous measurement, transparent objects
- MeSH terms
- Computer Simulation, Equipment Design, Interferometry, Lenses, Materials Testing, Models, Theoretical, Refractometry, Computer-Aided Design, Microscopy, Confocal, Equipment Failure Analysis
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