Tapered fusing cladding power filter

Abstract

The invention relates to a tapered fusing cladding power filter that comprises a fiber for removing an outer cladding and a coating layer. An optical glass layer is connected with and solidified on the fiber and is a tapered body. The outer diameter of the tapered body is gradually decreased along the propagation direction of the light in the fiber. The tapered optical glass layer replaces optical glue so as to improve the heat resistance temperature and a heat conduction coefficient of the material itself. The refractive index of the tapered optical glass layer is greater than the refractive index of the removed outer cladding and the coating layer. By means of a change in the refractive index, the total reflection condition of the cladding light is broken and the low-order mode light is introduced into the tapered optical glass layer. Then, by means of a shape change of the tapered fiber, the low-order mode light is gradually converted to high-order mode light through an increase in the number of times of the internal light reflection and then is filtered out along the surface of tapered fiber. Thus, a filtering effect is achieved. The heat converted in the tapered optical glass layer is conducted by a cooling medium.

Description

[0001] Technical field [0002] The invention relates to the technical field of fiber laser devices, in particular to a molten cladding power filter. Background technique [0003] With the development of fiber optic technology, the power of fiber laser is increasing year by year, and its main realization is laser synthesis in fiber laser seed system and fiber laser amplification system. In order to ensure the safe and stable operation of the laser system and the quality of the beam, it is necessary to filter the pump light and laser in the fiber cladding before the output of the fiber laser or before entering the next-level system. The existing technology and method is to remove a section of coating and outer cladding of single-clad optical fiber or double-clad optical fiber, and fully contact the bare part of the optical fiber with optical glue whose refractive index is higher than that of the removed part. When the laser system is running, the cladding The pump light or las...

AI Technical Summary

Problems solved by technology

However, due to the absorption of pump light and laser light by the optical glue, and the low thermal conductivity of the optical glue itself, the light energy in the optical glue layer is quickly converted into heat energy, which makes the temperature of the optical glue rise, which affects the properties of the optical glue itself, and even damages it. Ultimately limits the effect of cladding power filtering

Images