Gain photon crystal fiber waveguide and its device

Abstract

The invention relates to a gain photon crystal optical fiber waveguide, which is composed of a core layer and a coating layer which surrounds the core layer. The inner coating layer of the optical fiber comprises a solid microstructure point lattice which is formed by a germanium-doped silica column, and forms an outer band gap of the gain optical fiber, the function thereof is that the multimodepump light can be strictly restricted in a second fiber core region which is provided with rare earth doped ions to improve the utilizing efficiency of the pump light; the second fiber core of the optical fiber is composed of a solid microstructure point lattice which is formed by a rare earth ion silica column to form an inner band gap of the gain optical fiber, the function thereof is that through the multimode pump light, the generated laser light can be strictly restricted in a first fiber core region which is formed by high pure silica glass. Adopting the solid gain photonic crystal optical fiber can greatly improve the utilization efficiency of the pump light, improve beam quality of output laser light, enhance output power of the optical fiber laser, and reduce nonlinear effect of the high-power laser device.

Description

technical field [0001] The invention relates to a gain photonic crystal optical waveguide, in particular to a rare earth-doped photonic bandgap optical waveguide in the application field of high-power lasers, and a fiber laser manufactured by using the gain photonic crystal optical waveguide. Background technique [0002] With the rapid development of energy optoelectronic technologies such as semiconductor laser pumping and laser coupling, high-power fiber lasers have achieved unprecedented technological progress. Ytterbium-doped, erbium-doped, erbium-ytterbium co-doped, thulium-doped, and neodymium-doped various new fiber lasers have been widely used. Multimode pumping technology has developed from the initial end-pump technology to the current side-pump technology, from single-pump technology to multi-pump combination technology; from incoherent to laser coherent technology; the power of fiber lasers has also changed from the initial milliwatt level Developed to kilowatt...

AI Technical Summary

Problems solved by technology

[0006] At present, high-power fiber lasers mostly use conventional double-clad gain fibers. This fiber laser has the following technical problems that are difficult to solve. For example, expanding its mode field diameter is one of the main ways to increase the laser power of a fiber laser, but increasing the mode The diameter will bring some negative effects, such as the decrease of beam quality and the increase of bending loss. In order to increase the laser power of the fiber, the conventional double-clad gain fiber increases the mode field diameter of the fiber. In order to ensure the beam quality, it has to be reduced. The numerical aperture of the fiber core not only brings great difficulty to the process, but also it is impossible for this technology to increase the mode field greatly. In addition, when the mode field diameter is increased, the bending loss increases sharply, resulting in optical power leakage. Even the optical fiber is damaged and cannot work normally

[0007] U.S. Patent US20050105867 and Chinese Patent CN200480033979.7 describe an active photonic bandgap fiber. The core of the fiber is air, and the fusion loss with other fibers is relatively large, and the fiber of this invention uses surface mode to transmit laser light. The loss is large and cannot well meet the needs of practical applications

Chinese patent 200510025561.8 describes an active large-core single-mode double-clad photonic crystal fiber. The fiber uses inner air holes to achieve endless single-mode characteristics, thereby improving the beam quality of fiber lasers. However, the fiber has a large bending loss. The nonlinear effect is obvious, and the multi-mode pump power cannot be effectively converted into single-mode laser power.

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