Laser scanning relay lens group and confocal laser endomicroscopy comprising relay lens group

Abstract

The invention discloses a laser scanning relay lens group used in a confocal laser endomicroscopy system. The laser scanning relay lens group is arranged between a two-dimensional laser scanning mechanism (1) used for deflecting excitation light beams and a coupling object lens (3) used for performing focusing and imaging on collimation light beams and coupling the light beams into an optical fiber bundle probe (4) in order to compress the deflected light beams. The laser scanning relay lens group is characterized in that the magnification M of the laser scanning relay lens group (2) is greater than 1. The invention also discloses a confocal laser endomicroscopy system comprising the above laser scanning relay lens group. According to the laser scanning relay lens group and the system, the condition that the exit pupil of emitted light beams and the entrance pupil of the coupling object lens are matched is guaranteed, the swing angle of a scanning vibrating mirror is employed to the maximum, the influence of positioning errors of the vibrating mirror on pixel jittering is reduced, and the system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of biomedical devices, and in particular relates to a laser scanning relay mirror group used in a confocal microendoscope system and a confocal microendoscope with the laser scanning relay mirror group. Background technique [0002] Confocal endoscopy (CLE) is a derivative technology of confocal microscopy, which is mainly used in the fields of medicine and biology. Currently, probe confocal endoscopy (pCLE) is widely used in clinical practice. Clinically, the probe-type confocal microendoscope uses an image transmission fiber bundle composed of tens of thousands of optical fibers to transmit the image of the tissue structure in the human body to the display device for reading and interpretation. [0003] The confocal microendoscope host uses a two-dimensional scanning mechanism composed of a galvanometer-type galvanometer / resonant-type galvanometer to deflect the excitation laser beam in a two-dimensional p...

AI Technical Summary

Problems solved by technology

That is, on the one hand, the scanning angle of the scanning galvanometer of the confocal microendoscope system in the prior art is too small, and this scanning angle needs to be divided according to the number of image pixels such as 1024, and the small angle makes the divided angle too large. Small, so that the deflection of the galvanometer is easily disturbed by the noise of the system circuit, which will affect the positioning of the galvanometer, increase the positioning error of the galvanometer, cause the jitter of the pixel, and further deteriorate the quality of the confocal image

On the other hand, because the maximum deflection angle of the ordinary galvanometer can reach ±20 degrees, the existing system does not make full use of the deflection angle of the galvanometer as much as possible, and the too small scanning angle also seriously sacrifices the performance of the galvanometer.

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