Fiber probe structure for outputting annular light spot from sidewall

Abstract

The invention discloses a fiber probe structure for outputting an annular light spot from a sidewall. The fiber probe structure comprises a hollow fiber and a conductive fiber which are coaxial. The rear end of the hollow fiber and the front end of the conductive fiber are subjected to fusion splicing. The hollow fiber is provided with a through hole in the axial direction. The front end of the through hole is provided with a front conical surface and the rear end of the through hole is provided with a rear conical surface. The front conical surface is coaxial with the hollow fiber. The taper angle of the front conical surface is oriented to the left and the taper bottom of the front conical surface is oriented to the right. The rear conical surface is coaxial with the hollow fiber. The taper angle of the rear conical surface is oriented to the left and the taper bottom of the rear conical surface is oriented to the right. The taper angle of the rear conical surface is connected with the output end of the conductive fiber. The fiber probe structure can effectively control a laser transmitted in the fiber to be output from the sidewall. The laser intensity output from the sidewall is uniform in the intensity and does not change with the refractive index of a working medium, and the divergence angle of the output annular spot is controllable. The fiber probe structure has simple structure, wide applicability and high reliability.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to an optical fiber probe structure for outputting a ring-shaped light spot on a side wall. Background technique [0002] With the development of society and the improvement of people's living standards, due to the intake of high-fat and high-protein foods, blood and vascular diseases such as thrombus and varicose veins are also prone to occur. Fiber-guided lasers can effectively treat these diseases through photothermal, ablation or vaporization methods. However, during the treatment process, it is generally necessary to use the ring-shaped light spot to illuminate the inner wall of the blood vessel to determine the location of the lesion in the blood vessel. If direct treatment of a large area is required, a high-power annular laser spot can also be used. In addition, in the application fields such as cleaning or repairing the inner wall of some fine pipes, it is also nec...

AI Technical Summary

Problems solved by technology

Although both methods can obtain ring-shaped light spots, the generally obtained ring-shaped light spots are not output from the side but output and diverge at the end face of the fiber, and the divergence angle is affected by the numerical aperture of the fiber

In addition, there are problems such as large loss in eccentric coupling, and bending of the fiber can easily affect the uniformity of the annular spot.

The fiber taper method is to couple the fundamental mode of the fiber into the cladding through the fiber taper to obtain an annular spot, but this method has a small diameter of the fiber taper area and low mechanical strength, and the obtained spot shape is also easily affected by the refractive index of the liquid in the working area.

Therefore, neither is widely used

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