GTI-based dispersion management optical fiber laser,

Abstract

The invention discloses a GTI-based dispersion management optical fiber laser, which comprises a pumping source, an optical fiber device and a space device, the optical fiber device comprises a wavelength division multiplexer, a gain optical fiber, a focuser and an optical fiber collimator, and the space device comprises a first GTI mirror and a second GTI mirror which are arranged on the rear side of the optical fiber collimator and are parallel to each other. The GTI is adopted to replace a grating pair or a fiber Bragg grating, the reflectivity of the GTI can generally reach 99.9%; when more abnormal dispersion is provided by laser in a multi-reflection cavity, compared with the grating pair, the GTI can obviously reduce insertion loss introduced by a device, and improve the output efficiency of the laser; and the GTI serving as a solid device which is not easily influenced by environmental change can improve the environmental stability of the laser compared with the FBG. Meanwhile, the problem that the output efficiency of an ytterbium-doped fiber laser adopting a grating to conduct dispersion management is not easy to continue to be improved, and the problem that the environment stability of a ytterbium-doped fiber laser adopting FBG dispersion management is insufficient in the prior artare solved.

Description

technical field [0001] The invention belongs to the technical field of ultrafast fiber laser, relates to a fiber laser, in particular to a GTI-based dispersion management fiber laser. Background technique [0002] In ytterbium-doped fiber lasers, ordinary fibers can only provide normal dispersion. If dispersion management is required, pairs of gratings or fiber Bragg gratings (FBG) with anomalous dispersion are usually used to provide anomalous dispersion to control the net dispersion in the resonator. Control to achieve narrower pulse and wider spectral output. However, both approaches have inherent drawbacks. The grating pair compensates for dispersion by diffracting light of different frequencies in the light pulse to cause them to produce optical path differences. Although the diffraction efficiency is considerable (up to 90%), when multiple reflections provide more anomalous dispersion, the efficiency is lower. Sudden reduction will introduce more intracavity losses, ...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a GTI-based dispersion managed fiber laser to solve the problem that the output power of the ytterbium-doped mode-locked fiber laser that adopts the grating dispersion management in the prior art is not easy to continue to increase and the existing Poor environmental stability of ytterbium-doped mode-locked fiber lasers using FBG dispersion management in technology

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