Fiber cladding power filter and manufacturing method thereof

Abstract

The invention discloses a fiber cladding power filter, which comprises a double-cladding fiber, the cladding light of which is to be filtered, and a heat sink. The heat sink is internally provided with an inner hole; a water channel layer is arranged around the inner hole; the side wall of the heat sink is provided with a water inlet and a water outlet communicated with the water channel layer; the two ends of the heat sink are respectively provided with a fiber fixation member; and the fiber fixation members enable a fiber, one section of which is stripped to expose an inner cladding, in the double-cladding fiber, the cladding light of which is to be filtered, to be placed and sealed in the heat sink. The manufacturing method of the fiber cladding power filter comprises the following steps: S1) stripping one section of an outer cladding of the double-cladding fiber, the cladding light of which is to be filtered, to expose the inner cladding; S2) processing the exposed inner cladding; S3) heating the exposed inner cladding processed in the step S2); and S4) packaging the double-cladding fiber obtained after heat diffusion treatment in the step 3) into the heat sink. The cladding refractive index of the double-cladding fiber is modified, and laser in the cladding can be filtered efficiently and reliably.

Description

technical field [0001] The invention relates to a cladding power filter which is used in a high-power fiber laser and is manufactured by using the principle of ion replacement. Background technique [0002] In recent years, with the wide application of fiber lasers in material processing and military equipment, fiber lasers are required to have higher beam quality and longer service life while their power continues to rise. The cladding of the fiber at the output end of the fiber laser not only contains residual pump power, but also high energy generated by nonlinear effects such as spontaneous emission (ASE), Raman scattering (SRS), and Burillouin scattering (SBS). order laser. These have a negative impact on the working performance of the laser, and may cause damage to the output end face of the fiber, destroying the rear-end collimation and focusing optical path of the fiber laser. The laser power can even reach more than 100W. If these powers are not filtered before the...

AI Technical Summary

Problems solved by technology

However, since the cladding power that needs to be filtered out in high-power fiber lasers can reach more than 100W, and most of the cladding power will be filtered out in a small section of the front end of the filter, this will cause the local temperature of the filter to rise sharply, while Ultraviolet glue made of organic matter is prone to property changes at high temperatures, which has a great impact on the reliability of the filter

However, other manufacturing methods of cladding power strippers, such as hydrofluoric acid etching method and high refractive index matrix method, have too many uncontrollable factors in the process of manufacturing and using, which may easily cause problems such as uneven stripping and local hot spots. The stability and reliability of the remover are greatly affected, and it is not suitable for high-power fiber lasers

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