Full-Field Optical Coherence Tomography Using Galvo Filter-Based Wavelength Swept Laser.

Area of Science:

• Optics and Photonics
• Metrology
• Materials Science

Background:

• Optical Coherence Tomography (OCT) is a powerful non-invasive imaging technique.
• Wavelength swept lasers offer advantages in speed and resolution for OCT systems.
• Accurate measurement of sample surfaces and thicknesses is crucial in various industrial fields.

Purpose of the Study:

• To develop and demonstrate a wavelength swept laser-based full-field optical coherence tomography (OCT) system.
• To evaluate the system's capability for measuring surfaces and thicknesses of both refractive and reflective samples.
• To showcase the system's potential for industrial applications, such as optical thin film analysis.

Main Methods:

• Utilized a galvo filter-based wavelength swept laser source.
• Employed a simple Michelson interferometer configuration.
• Synchronized camera acquisition with the swept source for real-time cross-sectional imaging.
• Tested with combinations of refractive and reflective samples, including resolution targets and step height standards.

Main Results:

• Successfully demonstrated cross-sectional imaging of sample surfaces and thicknesses.
• Achieved topographical and cross-sectional information of various sample types.
• Validated the system's effectiveness for thickness measurement of optical thin films.
• Showcased the potential for depth investigation in industrial settings.

Conclusions:

• The developed wavelength swept laser OCT system is effective for measuring surfaces and thicknesses of diverse samples.
• The system provides valuable cross-sectional and topographical data, suitable for industrial quality control.
• This technology holds promise for applications requiring precise metrology of optical components and materials.