Back to Search
Start Over
All-fiber probe for optical coherence tomography with an extended depth of focus by a high-efficient fiber-based filter.
- Source :
-
Optics Communications . Apr2018, Vol. 413, p276-282. 7p. - Publication Year :
- 2018
-
Abstract
- Although methods have been proposed to maintain high transverse resolution over an increased depth range, it is not straightforward to scale down the bulk-optic solutions to minimized probes of optical coherence tomography (OCT). In this paper, we propose a high-efficient fiber-based filter in an all-fiber OCT probe to realize an extended depth of focus (DOF) while maintaining a high transverse resolution. Mode interference in the probe is exploited to modulate the complex field with controllable radial distribution. The principle of DOF extension by the fiber-based filter is theoretically analyzed. Numerical simulations are conducted to evaluate the performances of the designed probes. A DOF extension ratio of 2.6 over conventional Gaussian beam is obtainable in one proposed probe under a focused beam diameter of 4 . 6 μ m . Coupling efficiencies of internal interfaces of the proposed probe are below −40 dB except the last probe–air interface, which can also be depressed to be −44 dB after minor modification in lengths for the filter. Length tolerance of the proposed probe is determined to be − 28 ∕ + 20 μ m , which is readily satisfied in fabrication. With the merits of extended-DOF, high-resolution, high-efficiency and easy-fabrication, the proposed probe is promising in endoscopic applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00304018
- Volume :
- 413
- Database :
- Academic Search Index
- Journal :
- Optics Communications
- Publication Type :
- Academic Journal
- Accession number :
- 127760356
- Full Text :
- https://doi.org/10.1016/j.optcom.2017.12.048