Optical fiber probe and variable-focus optical fiber OCT device based on adjustable mode field area

Abstract

The invention provides an optical fiber probe and a variable-focus optical fiber OCT device based on an adjustable mode field area. The OCT device comprises a broadband light source, a laser light source, a first coupler, a reference arm light path structure, a sample arm light path structure and a spectral analysis component; the source light beam is divided into a first light beam and a second light beam by a coupler I; the sample arm light path structure adopts an optical fiber probe as a sample arm; the first light beam enters the reference arm light path structure, and the second light beam is coupled with pump light emitted by the laser light source and enters an optical fiber probe of the sample arm light path structure, so that the focus of the optical fiber OCT device is adjustable; and the spectral analysis component is used for receiving and analyzing the first light beam reflected back from the reference arm light path structure and the second light beam reflected back fromthe sample arm light path structure. The variable-focus optical fiber OCT device adopts an all-fiber probe structure as a sample arm, is small and exquisite, is easy to package, and has the characteristic of adjustable focus; and meanwhile, the variable-focus optical fiber OCT device can be used for endoscopy, and achieves high-resolution imaging beyond the depth-of-field range.

Description

technical field [0001] The present invention relates to the technical field of optical fiber devices, and more specifically, relates to an optical fiber probe and a variable-focus optical fiber OCT (optical coherent tomography, OCT) device based on an adjustable mode field area. Background technique [0002] Due to its unique non-invasive properties, optical coherence tomography has been widely used in the field of biomedical imaging as a promising imaging method. As one of the important parameters of the OCT system, the resolution is the decisive factor affecting the imaging quality. The vertical resolution of the OCT device is affected by the central wavelength and bandwidth of the low-coherence light source, while the lateral resolution depends on the spot size of the beam focused on the sample to be tested, and the two are independent of each other. However, the lateral resolution and depth of focus of the OCT device are a pair of parameters that restrict each other. Th...

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Problems solved by technology

However, the optical fiber OCT device with adjustable focus is still in the initial stage of research

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