High-precision homogenized optical fiber and preparation method thereof

Abstract

The invention relates to a high-precision homogenized optical fiber and a preparation method thereof, in particular to a double-core optical fiber. Thedouble-core optical fiber comprises a first fiber core (1), a second fiber core (2), a first cladding (3), a second cladding (4) and an outer coating (5). The central point of the first fiber core does not coincide with the central point of the second fiber core, the first fiber core is arranged in the second fiber core, the first cladding is coated outside the second fiber core, and the second cladding is coated outside the first cladding. The section of the first fiber core is circular or square, the section of the second fiber core is circular, the fiber cores are designed to be of a double-core structure, light spot modes are effectively disturbed, laser energy can be evenly distributed on the whole section, the method is simple, the fiber cores do not need to be subjected to special-shaped machining, viscosity matching can be carried out between the fiber cores and a cladding to the maximum extent, defects in the optical fiber drawing process are reduced, control mode transmission and large-scale production are facilitated, and mode distribution which is flexibly regulated and controlled is obtained.

Description

technical field [0001] The invention relates to a high-precision homogenizing optical fiber and a preparation method thereof. It belongs to the technical field of optics and laser optoelectronics. Background technique [0002] With the intensified demand of enterprises in the field of precision laser processing in the market, the homogenized spot can greatly improve the processing accuracy, and in terms of performance, it can largely replace the homogenizer for use. In the field of laser processing, the homogenization of spot energy can greatly improve the processing accuracy. At the same time, in the field of astronomical observation, it can improve the measurement accuracy, replace the homogenizer, and greatly reduce the cost. [0003] At present, in the existing related technologies, there are mainly two structures of the energy homogenizing optical fiber: one kind of fiber core structure in which the fiber core of the fiber is circular, and the other kind of fiber core ...

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Problems solved by technology

[0004] In the preparation of homogenized optical fiber solutions in the industry, most of them still use square cores. Among them, Chinese invention patent 202010845610.7 discloses "an energy homogenized optical fiber and its preparation method". The cross-sectional shape of the core in this patent is polygonal , which destroys the circular symmetry structure. Although it can enhance the homogenized spot of the optical fiber, the preparation process is complicated and not suitable for large-scale production.

At present, in the existing technologies, the preparation of core rods is mainly based on PCVD and MCVD technology. Due to the limitation of the deposition length of the internal deposition method, it is difficult to increase the productivity of a single rod, and the passive optical fiber is very useful in the application of energy homogenization. Important, therefore, the upgrade and improvement of the mandrel preparation process is extremely important for the improvement of the performance and production capacity of the whole rod

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