High-efficiency beam combination laser fiber and drawing method thereof

Abstract

The invention discloses a drawing method of a high-efficiency beam combination laser fiber, and relates to the technical field of fiber laser transmission and amplification. The method comprises the steps that S1, a basic plane is arranged on each of the side surfaces of a gain fiber preform and a pump fiber preform; the basic plane of the gain fiber preform is processed inwards; a plurality of ribs are raised; planes on the two sides of each rib are processing surfaces; a plurality of grooves are formed inwards in the basic plane of the pump fiber preform; the ribs are matched with the grooves; S2, the ribs of the gain fiber preform are embedded into the grooves of the pump fiber preform; after combination of the ribs and the grooves, one end of a whole combination body is fixed by a taper to form a beam combination laser fiber preform; and S3, the beam combination laser fiber preform is drawn into the beam combination laser fiber by wire drawing. The drawing method is higher in technology repeatability; and obtained beam combination laser can achieve pump fiber stripping in a set area, and facilitates achieving multipoint pump photoinjection in a length direction of the beam combination laser fiber.

Description

technical field [0001] The invention relates to the technical field of optical fiber laser transmission and amplification, in particular to a high-efficiency parallel beam laser optical fiber drawing method and an optical fiber. Background technique [0002] Fiber lasers essentially convert low-quality pump lasers into higher-quality laser outputs. Due to the continuous expansion of application fields, the demand for output power of fiber lasers is also increasing. Now high-power fiber lasers and fiber amplifiers are mainly used. It is a double-clad doped fiber, and compared with the divergence angle of the multimode pump beam emitted by the semiconductor pump laser, the inner cladding diameter of the double-clad doped fiber is very small, so how to efficiently couple the pump light to the double-clad fiber The inner cladding of cladding fiber is the core technology for obtaining high-power fiber laser output. [0003] At present, pump coupling technology can be roughly div...

AI Technical Summary

Problems solved by technology

Although the single optical fiber drawing technology is very mature at present, there are still many difficulties in the simultaneous drawing of multiple optical fibers, such as the drawing tension, temperature, and corresponding optical fiber of each preform during the combined drawing process of multiple optical fiber preforms. There are differences in the coating pressures, and it is difficult to effectively control and adjust

Moreover, the current combined drawing method of preforms uses a plurality of cylindrical preforms to combine and then draws, and in order to ensure that the optical fibers can be effectively fused, the conditions of low speed and high tension are adopted, and the optical fiber preforms will be melted and combined with each other, so the drawn The quartz parts of the fiber are fused and tightly bonded to each other, and cannot be peeled off as required, so it is also impossible to achieve multi-point pump light injection in the length direction.

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