Intra-cavity frequency doubling green-ray fiber laser with full optical fiber structure

Abstract

The invention discloses an intra-cavity frequency doubling green-ray fiber laser with a full optical fiber structure. The laser comprises a pumping assembly, a first fiber bragg grating, a third fiber bragg grating, a second fiber bragg grating and a first tail fiber, wherein the output end of the pumping assembly is connected with the first fiber bragg grating; the first fiber bragg grating, the third fiber bragg grating and the second fiber bragg grating are arranged concentrically; a double-pack yttrium-doping optical fiber is connected between the first fiber bragg grating and the third fiber bragg grating; an intra-cavity frequency doubler is connected between the third fiber bragg grating and the second fiber bragg grating; the output end of the second fiber bragg grating is connected with the first tail fiber; and all the components are connected in a molten connecting mode. According to the invention, an optical fiber laser technology and a full-solid intra-cavity frequency doubling technology are combined by the laser, intra-cavity frequency doubling is realized by adopting the full optical fiber structure, the laser outputs at the green ray wave band, the defects caused by the formation of discrete components for the existing laser are overcome, the optical conversion efficiency is improved, the output light bundle has good quality, the light-light conversion efficiency is high, the structure is compact, the performances are stable, and the frequency doubling efficiency is approximate to 100%.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a laser, in particular to an intracavity frequency-doubling green fiber laser with an all-fiber structure. Background technique [0002] In recent years, fiber lasers have developed rapidly due to their small size, high efficiency, good stability, and good beam quality. However, the output wavelengths of mature high-power fiber lasers that account for most of the market share are mainly concentrated in 1030nm-1100nm. , the simplification of the output wavelength limits the application of fiber lasers in many fields, especially in the visible light band. Correspondingly, the use of nonlinear frequency conversion technology in all-solid-state lasers has achieved good results in obtaining laser technology in the visible light band, especially the intracavity frequency doubling technology of all-solid-state lasers, which has almost become the main force of solid-state lase...

AI Technical Summary

Problems solved by technology

[0002] In recent years, fiber lasers have developed rapidly due to their small size, high efficiency, good stability, and good beam quality. However, the output wavelengths of mature high-power fiber lasers that account for most of the market share are mainly concentrated in 1030nm-1100nm. , the simplification of the output wavelength limits the application of fiber lasers in many fields, especially in the visible light band

Correspondingly, the use of nonlinear frequency conversion technology in all-solid-state lasers has achieved good results in obtaining laser technology in the visible light band, especially the intracavity frequency doubling technology of all-solid-state lasers, which has almost become the main force of solid-state lasers in the visible band. However, when applying intracavity frequency doubling technology to fiber lasers, a contradiction is encountered: the advantage of fiber lasers lies in its all-fiber fusion splicing and no discrete components, so it has good stability, maintenance-free and easy to use, but if the frequency doubling is inserted Discrete components such as crystals will inevitably destroy the advantages of good stability, maintenance-free and easy-to-use fiber lasers, and lose market competitiveness

[0003] Existing fiber laser frequency doubling technology is mainly limited to extracavity frequency doubling or intracavity discrete component frequency doubling, such as double-clad green fiber laser (application number: 200620079299.5), double-clad fiber Intracavity frequency doubled laser (patent number: 03116633.4), intracavity frequency doubled blue fiber laser (application number: 200820155748.9), high power blue fiber laser (application number: 200620079296.1), these lasers are all composed of discrete components, essentially In other words, these technologies are replicas of the all-solid-state intracavity frequency doubling technology. Although it is moved into the fiber laser, the high stability of the fiber laser itself is destroyed, and the advantages of the fiber laser cannot be shown.

In addition, most of the existing green fiber lasers use neodymium-doped fibers as the gain material, such as the red, green and blue trichromatic lasers (application number: 02117363. Frequency doubled blue fiber laser (application number: 200820155748.9), these fiber lasers have poor efficiency and cannot meet the needs of technological development

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