Side pump all fiber and laser and amplifier based on all fiber

Abstract

The invention relates to a side pump all fiber and a laser and an amplifier based on the all fiber. The side pump all fiber comprises a gain fiber and a transmission fiber which are welded without a melting point. The invention provides the side pump all fiber without the fiber melting point at a pump section and with high pump coupling efficiency and a good heat radiation effect, and provides the laser and the amplifier based on the all fiber.

Description

Technical field [0001] The invention belongs to the technical field of laser pump coupling, and relates to a fiber laser, in particular to a side pumped all-fiber and a laser and amplifier based on the all-fiber. Background technique [0002] Fiber laser is one of the most passionate, innovative, dynamic, and rapid development and most eye-catching important directions in the field of laser technology in recent years. Since the 1960s [Snitzer E, Optical maseraction of Nd 3+ in a barium crown glass[J].Physical Review Letters, 1961, 7(12):444-446.], fiber lasers have become a field in which scientific and technological workers compete to carry out research, and have achieved remarkable scientific and technological achievements. Theoretical research has developed to the current single-mode fiber laser with a power output of 10,000 watts. [0003] Among the many research results of fiber lasers, among the most eye-catching, most promising, and highest-power fiber laser technical solu...

AI Technical Summary

Problems solved by technology

However, this technical solution also has a big defect, that is, it still cannot solve the problem of infinite expansion of the pumping power of semiconductor lasers.

After the multi-channel (6 channels in the figure) pump laser is transmitted through a 1-2 cm cone, and then passes through a melting point, a large optical power loss will occur, and the cladding here needs to be pumped by a kilowatt semiconductor pump. For pumping light, the fiber core needs to pass through a kilowatt fiber laser. In principle, this technology cannot withstand the pumping of thousands of watts, let alone achieve a 10,000-watt fiber laser.

At present, the highest level of fiber combiner in the world is the end-pumped fiber combiner of ITF [PCT patent: WO2007 / 090272, domestic patent: 200780009246], the maximum load power of a single arm is 200 watts, according to 6 optical fibers According to calculations, the pump power of each fiber combiner is 1200 watts, which severely limits the increase of the laser output power of fiber lasers to 10,000 watts and 100,000 watts, which has also become a bottleneck restricting the development of fiber lasers

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