A pump coupler for kilowatt-scale fiber lasers

Abstract

The invention discloses a pumping coupler for a kilowatt-level fiber laser, comprising: a pumping fiber, a main fiber and a packaging shell; the pumping fiber is connected to the main fiber, and at the access point of the pumping fiber and the main fiber The encapsulation shell is arranged at the place; the encapsulation shell includes an external copper tube, a heat-conducting copper tube and a light-conducting glass layer; the external copper tube is coaxially arranged on the outside of the heat-conducting copper tube; the cavity formed by the external copper tube and the heat-conducting copper tube is pierced with water pipes; heat conduction The inner wall of the copper tube is provided with a light-conducting glass layer; at the port of the heat-conducting copper tube, an optical adhesive layer is provided between the light-conducting glass layer and the main optical fiber, and the access point is sealed in the cavity of the heat-conducting copper tube. The pump coupler disclosed in the present invention can be used in kilowatt-level fiber lasers, and has low manufacturing difficulty and low production cost; at the same time, it can work stably for a long time in kilowatt-level fiber lasers, and is especially suitable for the environment of uninterrupted production in factories throughout the day .

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a pumping coupler for kilowatt-class fiber lasers. Background technique [0002] Fiber lasers have been widely concerned by researchers from various countries due to their significant advantages such as good beam quality, high conversion efficiency, low pumping threshold, good heat dissipation performance, small size and light weight, and have achieved rapid development in recent years. In particular, high-power fiber lasers have become the representative of the third-generation laser technology due to their excellent beam quality, ultra-high stability, easy use and real maintenance-free, and are widely used in automobiles, aircraft, Shipbuilding and other fields, such as skin cutting, steel plate welding, and parts repairing. The pump coupler is the key passive optical device of the fiber laser. It couples the pump light generated by the multi-path semiconductor laser into the m...

AI Technical Summary

Problems solved by technology

[0003] Due to the important position of the pump coupler in the fiber laser, the development of the pump coupler has become a research hotspot for researchers in the field of high-power fiber lasers all over the world in recent years, and there have been mature pump couplers and high-power For fiber laser products, IPG has reported 2kW, 4kW and 10kW fiber lasers, and its disclosed couplers can only be used for IPG’s specific fiber lasers. Due to the technical parameters of pump couplers suitable for high-power fiber lasers Both are very high, which requires high precision of the production process, high difficulty in production, and high production cost;

[0004] At present, domestic mature products are still rare, and most of them rely on imports. They need to import a complete set of fiber lasers, and the pump coupler cannot be replaced separately; at the same time, the existing pump coupler is equipped with a metal shell in the fiber coupling area. Due to the leakage of pump light in the coupling area, it is easy to cause the temperature of the pump coupler to rise. When the temperature rises to a certain level, it is easy to cause damage to the pump source; it cannot guarantee long-term constant temperature work. It is prone to failure and reduces production efficiency; therefore, it is very important to study a pump coupler that can be replaced separately, which can be used for kilowatt-class fiber lasers and can ensure long-term constant temperature operation

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