Extended focus optical coherence tomography with Fresnel lens
We report a Fresnel lens based spectral domain optical coherence tomography (SDOCT) setup to overcome the trade-off between lateral resolution and focusing depth which is one of the main problems for OCT system. We demonstrated the feasibility of the Fresnel lens based SDOCT system by measuring the lateral resolution at different depth positions and compared these results with that obtained by conventional SDOCT illuminated with a light source of a central wavelength of 840 nm and a bandwidth of 50 nm. These results indicated that the Fresnel lens based SDOCT can maintain a constant lateral resolution (~ 6.2 μm or better in our system) over a depth of ~ 2 mm which is nearly 1.2 mm larger than conventional SDOCT. This advantage of the proposed method is very useful for SDOCT based imaging technique applied in the clinical application.
KeywordsLateral resolution Spectral domain optical coherence tomography Optical focusing depth
We would like to thank the National Natural Science Foundation of China (NSFC, No: 61275198, 60978069) and the Natural Science Foundation of Jiangsu Higher Education Institutions of China (No: 19KJD140001).
- 2.Zang, P., Gao, S.S., Hwang, T.S., Flaxel, C.J., Wilson, D.J., Morrison, J.C., Huang, D., Li, D., Jia, Y.: Automated boundary detection of the optic disc and layer segmentation of the peripapillary retina in volumetric structural and angiographic optical coherence tomography. Biomed. Opt. Exp. 8, 1306 (2017)CrossRefGoogle Scholar
- 9.Chen, C., Cheng, K.H.Y., Jakubovic, R., Jivraj, J., Ramjist, J., Deorajh, R., Gao, W., Barnes, E., Chin, L., Yang, V.X.D.: High speed, wide velocity dynamic range doppler optical coherence tomography (Part V): optimal utilization of multi-beam scanning for Doppler and speckle variance microvascular imaging. Opt. Exp. 25, 7761 (2017)ADSCrossRefGoogle Scholar
- 18.Mwanza, J.C., Durbin, M.K., Budenz, D.L., Sayyad, F.E., Chang, R.T., Neelakantan, A., Godfrey, D.G., Carter, R., Crandall, A.S.: Glaucoma diagnostic accuracy of ganglion cell–inner plexiform layer thickness: comparison with nerve fiber layer and optic nerve head. Ophthalmology 119, 1151 (2012)CrossRefGoogle Scholar
- 21.Nishihara, H., Suhara, T.: I Micro Fresnel lenses, progress in optics, pp. 1–37. Elsevier, Amsterdam (1987)Google Scholar