Laser beam combination device and beam combination method for rectangular spot

Abstract

Disclosed are a laser beam combining device and a beam combining method for a rectangular spot. In the laser beam combining device, the light-emitting end faces of the transmission fibers of multiple lasers are coaxially arranged in a rectangular array, and a plurality of beam expanding collimating sleeves are also coaxially arranged in a rectangular array. Arrange and connect the light-emitting end faces of the transmission fibers of multiple lasers one by one through fiber optic connectors. The beams sent by each fiber connector respectively pass through the beam expander spherical lens of the beam expander collimator sleeve to expand the beam, the first collimator spherical surface After being collimated by the lens and the second collimating spherical lens, a quasi-parallel beam is formed, and the quasi-parallel beam passes through the aperture diaphragm without damage, and the aperture aperture can prevent the reverse stray light generated by the laser operation from damaging the laser; the multiple quasi-parallel beams The parallel beams are focused and combined by the shared first beam combining focusing cylindrical lens, the second beam combining focusing cylindrical lens, the third beam combining focusing cylindrical lens and the fourth beam combining focusing cylindrical lens to generate a single beam shape and a horizontal A composite beam with a rectangular cross-section.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a laser beam combining device and a beam combining method for a rectangular spot. Background technique [0002] At present, the 10,000-watt fiber laser or fiber-coupled transmission semiconductor laser has high output power (commercialized up to 10kW), fiber transmission (competent for various multi-dimensional and arbitrary space flexible processing applications), compact structure, adjustment-free, maintenance-free, high With advantages such as stability, it has become the first choice for industrial processing fields such as laser cutting, welding, drilling, surface treatment, and 3D printing. However, the production cost of such lasers is extremely high, and the application environment and conditions are harsh. At the same time, in the process of use, once a technical problem occurs, it is often difficult for the user to solve it, resulting in the shutdown of the entire proce...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this disclosure is to overcome the impact of the circular output spot of the existing 10,000-watt-level fiber laser or fiber-optic coupling transmission semiconductor laser used in laser heat treatment such as large-area, high-speed, flexible laser quenching, and laser cladding. Due to the high cost and the need to shut down the entire system once a technical problem occurs, the present invention provides a laser beam combining device and a beam combining method with a rectangular spot, which realizes spatially incoherent superposition of lasers transmitted by multiple optical fibers and obtains 10,000-watt-level, The combined beam spot is a rectangular single-beam laser output, so as to meet the technical requirements of large-area, high-speed, flexible laser heat treatment processing such as laser quenching and laser cladding.

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