Full-optical-fiber laser resonance cavity and production process thereof

Abstract

The invention discloses a full-optical fiber laser resonant chamber and a preparation method thereof. The resonant chamber comprises a doped double-cladding fiber, a front-end single-mode double-cladding fiber and a back-end single-mode double-cladding fiber. The mode fields of the fibers are matched with each other. The front-end single-mode double-cladding fiber and the back-end single-mode double-cladding fiber are joined with the front end and the back end of the doped double-cladding fiber by means of fusion. A front-end fiber grating and a back-end fiber grating are scribed on the front-end single-mode double-cladding fiber and the back-end single-mode double-cladding fiber respectively. The wavelength bandwidths of the front-end fiber grating and the back-end fiber grating are at least partially overlapped; the reflectivity of the front-end fiber grating is lower than the reflectivity of the back-end fiber grating. In the preparation method, the fiber gratings are scribed on the front-end single-mode double-cladding fiber and the back-end single-mode double-cladding fiber which are joined to the two ends of the doped double-cladding fiber by means of fusion and the mode fields thereof are matched with each other. The preparation method is simple and easy to be used; the performance of the product is improved; and the requirement of an optical fiber laser can be effectively met.

Description

technical field [0001] The invention relates to an all-fiber laser resonant cavity and a preparation method thereof. Background technique [0002] The concept of double-cladding pumping was first announced in 1988. Since then, cladding-pumped fiber lasers have truly achieved high power output. Double-cladding pumping technology has been widely used in fiber lasers and fiber amplifiers. , high-power double-clad fiber lasers have important application prospects in the fields of space, precision machining, laser radar, laser ranging, and laser medical treatment due to their advantages of compact structure, small volume, high power, and long life. In just over a decade, the single-mode output power of a single double-clad fiber laser has grown from tens of milliwatts to hundreds of watts. Scientists from various countries are still working on developing higher-power fiber lasers. The gain resonator of fiber laser adopts double-lens or fiber circulator structure: [0003] 1. Li...

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Problems solved by technology

[0006] The passive optical fiber ring is formed by directly connecting two output ends of a fiber coupler, or connecting an input end with an output end. The coupler acts as a feedback of the cavity mirror to form a resonant cavity. The beam splitting ratio of the laser is similar to the reflectivity of the F-P cavity mirror, which determines the fineness of the resonator. These two methods bring great difficulties to the coupling of the pump light and the packaging of the fiber laser, which is not conducive to the practicality of the fiber laser. and commercialization, which are particularly affected by external environmental factors

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