Optical fiber probe and length-adjustable variable-focus optical fiber OCT device based on beam expanding

Abstract

The invention provides an optical fiber probe and a length-adjustable variable-focus optical fiber OCT device based on beam expanding. The OCT device comprises a broadband light source, a laser lightsource, a first coupler, a reference arm light path structure, a sample arm light path structure and a spectral analysis component; the broadband light source is used for emitting a source light beam,and the source light beam is divided into a first light beam and a second light beam by the first coupler; the laser light source is used for emitting pump light; the first light beam enters the reference arm light path structure, and the second light beam is coupled with the pump light emitted by the laser light source and enters the optical fiber probe of the sample arm light path structure, sothat 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 lightpath structure and the second light beam reflected back from the 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, has the characteristic of adjustable focus, and can realize high-resolution imaging beyond the fixed depth-of-field range of a traditional probe.

Description

technical field [0001] The present invention relates to the technical field of optical fiber devices, and more specifically, to an optical fiber probe and a variable-focus optical fiber OCT (optical coherent tomography, OCT) device based on adjustable beam expansion length. 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. The sho...

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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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