Efficient fiber laser pumping coupler

Abstract

The invention belongs to the technical field of optical passive elements, in particular to an efficient fiber laser pumping coupler, which comprises an external copper pipe. A first extension pipe isintegrally formed on the right side of the external copper pipe; a first protective support lug is integrally formed on the outer wall of the first extension pipe; a cooling copper pipe is fixedly connected to the inner wall of the external copper pipe; a storage groove is formed in the cooling copper pipe; a heat conduction copper pipe is fixedly connected to the inner wall of the cooling copperpipe; a second extension pipe is integrally formed on the left side of the heat conduction copper pipe; and a second protection support lug is integrally formed on the outer wall of the second extension pipe. According to the features that liquid nitrogen is colorless, tasteless, non-corrosive, non-flammable and extremely low in temperature, effects of temperature reduction and heat dissipation are achieved; the liquid nitrogen does not contain impurities and cannot form blockage in the storage tank, so that the coupler cannot work in a high-temperature state, in the case of collision, the external force cannot directly act on the external copper pipe, and the coupler is prevented from being deformed and damaged due to the influence of the external force.

Description

technical field [0001] The invention belongs to the technical field of optical passive components, and in particular relates to a high-efficiency fiber laser pump coupler. Background technique [0002] The pump coupler is the key passive optical device of the fiber laser. It couples the pump light generated by the multi-route semiconductor laser into the main fiber to provide the required pump light power for the fiber laser. Its working principle is that the light in the fiber When the medium is transmitted, most of the energy is concentrated in the core, and only a small part is transmitted in the cladding. When the distance between the two fibers is close enough, due to the effect of evanescent waves, the light field in the two fibers Coupling, which affects the distribution of the original light field in the optical fiber, is widely used in automobiles, aircraft, shipbuilding and other fields, such as skin cutting, steel plate welding, and parts repairing. [0003] The ...

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Problems solved by technology

[0003] The Chinese patent with the publication number CN105244736B proposes a pump coupler for kilowatt-class fiber lasers. This patent can take away the heat of the heat-conducting copper tube through cooling water, speed up the heat loss, and ensure that the pump coupler can work for a long time. It is still in a constant temperature working state, but there is a water pipe between the external copper pipe and the heat-conducting copper pipe in the device. When it is used in a manufacturing factory, it is easy to be bumped by the staff if it is not operated properly. When squeezed and deformed, the water pipe is easily damaged, causing cooling water to leak. At the same time, the water is easy to form scale after being heated, and the scale will block the water pipe, seriously affecting the heat conduction effect, and it is necessary to add a water circulation device, which increases the cost.

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