Phosphate-silicate all-glass hybrid fibers for high-power fiber lasers

Abstract

The invention discloses a phosphate-silicate all glass hybrid optical fiber for a high-power optical fiber laser. The phosphate-silicate all glass hybrid optical fiber is characterized by being prepared by taking phosphate glass as a fiber core, silicate glass as the glass of inner and outer claddings, and phosphorus pentoxide (P2O5) and silicon dioxide SiO2 as main units in the respective phosphate glass and silicate glass structures, and by adding an alkali metal oxide, an alkaline earth metal oxide, an intermediate oxide and a rare earth oxide all capable of changing the physical and chemical properties of the glass; as the phosphate glass is taken as the fiber core, the photo-darkening phenomenon commonly existing in a quartz optical fiber is greatly reduced and even completely eliminated. The glass composition in the phosphate-silicate all glass hybrid optical fiber can be adjusted in a relatively wide range so that both the numerical aperture between the fiber core and the glass of the inner cladding of the optical fiber, and the numerical aperture between the glass of the inner cladding and the glass of the outer cladding can be adjusted in a relative large range, and the glass also has chemical durability, and therefore, the erosion to the environment can be effectively resisted; the phosphate-silicate all glass hybrid optical fiber also can be well welded with the traditional quartz optical fiber.

Description

technical field [0001] The invention relates to a glass matrix used for a high-power fiber laser, in particular to rare earth-doped phosphate glass as the fiber core matrix and silicate glass as the fiber cladding matrix, belonging to the field of optical fiber and laser technology. Background technique [0002] Fiber laser is a laser with fiber doped with rare earth elements as the gain medium. By doping different rare earth elements, such as erbium (Er), ytterbium (Yb), thulium (Tm), holmium (Ho), neodymium (Nd), etc. , the working band of fiber laser covers from ultraviolet to mid-infrared. Compared with other lasers, fiber lasers have distinctive features such as low laser working threshold, high energy conversion rate, good output beam quality, compact and stable structure, no need for optical path adjustment, good heat dissipation performance, long life and no maintenance, etc., so it has been developed rapidly and widely used. [0003] Commercially available silica ...

AI Technical Summary

Problems solved by technology

It is easy to produce changes in chemical composition and structure in the atmospheric environment, resulting in a corresponding deterioration of the laser performance of the fiber

2) Difficult welding with silica fiber