Lead silicate glass used in double-clad optical fiber, and double-clad optical fiber preparation method

Abstract

The invention relates to lead silicate glass used in double-clad optical fiber, and a double-clad optical fiber preparation method. According to the invention, fiber core, inner clad and outer clad glass are prepared with a melting method; an optical fiber preform is prepared with a stacking method; and drawing is carried out, such that double-clad lead silicate glass optical fiber is obtained. As a result of laser experiment upon the drawn double-clad optical fiber, ~2mum laser output is realized under 793nmLD pump.

Description

technical field [0001] The invention relates to a double-clad optical fiber with ~2 μm laser output, in particular to a lead silicate glass for the double-clad optical fiber and a preparation method for the double-clad optical fiber. Background technique [0002] The mid-infrared laser with a wavelength of ~2μm has a very broad application prospect and important application value in military, medical, environmental protection, remote sensing monitoring, optical communication and other fields. Among them, ~2μm single-frequency lasers have attracted much attention due to their potential applications in coherent radar and as pump sources for longer-wavelength mid-infrared lasers and supercontinuum. Usually the luminescence in the ~2μm band is achieved by doping Tm 3+ ( 3 f 4 → 3 h 6 ) or Ho 3+ ( 5 I 7 → 5 I 8 ) to obtain. From the material point of view, the gain fiber used for ~2μm fiber laser can be divided into silica fiber and multi-component glass fiber. [000...

AI Technical Summary

Problems solved by technology

However, the softening point of fluoride glass and heavy metals is low, and it is difficult to weld with quartz optical fiber, so it is difficult to realize commercialization; aluminosilicate glass belongs to a kind of silicate glass, and the glass softening temperature is high, so it can be welded with quartz optical fiber, but~ 2μm poor luminous performance, difficult to achieve laser output

[0005] Multi-component glass optical fibers are generally prepared by the tube rod method, but it is difficult to polish the inner wall of the glass tube during the processing of the glass tube, which brings relatively large losses to the optical fiber; at the same time, the optical fiber inner cladding and The outer cladding is generally circular, which will generate spiral light and reduce the pump coupling efficiency of the fiber

The stacking method is a quick and easy method that can produce higher quality optical fibers (patent application number: 201310511894.6), but the patent does not cover lead silicate glass

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