Outer cladding glass for silicate all-glass fibers of high-power fiber lasers

Abstract

The invention discloses an outer cladding glass for silicate all-glass fibers of high-power fiber lasers. The invention is characterized in that the outer cladding glass is composed of 5-20% of silicon dioxide, 50-70% of phosphorus pentoxide, at most 25% of alkali oxide, at most 10% of alkali-earth oxide, 10-20% of intermediate oxide and at most 10% of rare-earth oxide. The glass composition can be adjusted within a wider range, so that the number aperture between the inner cladding and outer cladding can be adjusted within a wider range, thereby easily satisfying the requirement of the all-glass high-power fiber laser for the number aperture of between the inner cladding and outer cladding of the fiber. Besides, the chemical composition of the outer cladding glass can be effectively optimized, so that the glass can achieve similar corrosion resistance to quartz glass so as to effectively prevent corrosion from the external environment, and can also be well welded with the traditional silica fiber.

Description

technical field [0001] The invention relates to a glass matrix used for high-power fiber lasers, in particular to a silicate glass with a very high content of phosphorus pentoxide as the outer cladding glass of optical fibers, which belongs to the technical field of optical fibers and lasers. 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 availab...

AI Technical Summary

Problems solved by technology

[0005] In tuning the silicate glass composition of the outer cladding, we found that using only silica SiO 2 As the main component of the glass structure, and adding other components such as alkali metal oxides, alkaline earth metal oxides and intermediate oxides that can change the physical and chemical properties of the glass, the refractive index of the outer cladding glass can be reduced, but not enough. Sufficient, the numerical aperture of the inner and outer cladding cannot reach a sufficiently large value