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Double common-path interferometer for flexible optical probe of optical coherence tomography.
Jae Seok Park1, Zhongping Chen, Myung Yung Jeong
1Department of Cogno Mechatronics Engineering, World Class University Program, Pusan National University, Busan, South Korea.
Optics Express
|January 26, 2012
Summary
A novel double common-path interferometer overcomes limitations in optical coherence tomography (OCT) probes. This advancement enables high-resolution 3D imaging with an improved transverse resolution of 0.7 μm.
Area of Science:
- Biomedical Optics
- Optical Engineering
- Medical Imaging
Background:
- Flexible optical cords are crucial for endoscopic optical coherence tomography (OCT).
- Conventional OCT systems face limitations due to partial reflector placement, impacting probe design and transverse resolution.
- Existing methods restrict the objective lens choice, hindering high-resolution imaging.
Purpose of the Study:
- To propose a novel double common-path interferometer for OCT.
- To overcome the limitations of partial reflector placement in endoscopic OCT probes.
- To achieve high-resolution 3D imaging with improved transverse resolution.
Main Methods:
- Developed a novel double common-path interferometer configuration.
- Utilized a Fourier-domain mode-locked swept laser source.
- Achieved simultaneous acquisition of intensity and phase terms.
Main Results:
- Generated an interference signal independent of the optical distance between the partial reflector and sample.
- Enabled the use of a high numerical aperture (NA) objective lens (up to 0.85).
- Achieved a 3D profile image with a transverse resolution of 0.7 μm and phase stability of 979 pm.
Conclusions:
- The proposed double common-path interferometer significantly enhances OCT probe design flexibility.
- High-resolution, phase-sensitive OCT imaging is achievable with improved transverse resolution.
- This technology offers potential for advanced endoscopic imaging applications.
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