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Method for inhibiting photo-darkening effect in active optical fiber

A technology of photonic darkening and fabrication method, which is applied in cladding fiber, optical waveguide light guide, multi-layer core/cladding fiber, etc. Fluorescence lifetime, fiber laser laser performance degradation and other issues, to achieve the effect of improving anti-photo-darkening performance, reducing the number of modes, and being easy to operate

Active Publication Date: 2017-11-24
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The co-dopant aluminum cerium yttrium ions will increase the refractive index and numerical aperture of the fiber core, thereby increasing the number of modes in the fiber, and at the same time increasing the fiber fusion loss, affecting the laser performance and output beam quality of the corresponding fiber laser
[0006] 2. Cerium yttrium ions will reduce the emission cross section, fluorescence lifetime and other parameters of rare earth ions, which will reduce the laser performance of the corresponding fiber laser

Method used

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  • Method for inhibiting photo-darkening effect in active optical fiber
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  • Method for inhibiting photo-darkening effect in active optical fiber

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Embodiment 1

[0054] The active optical fiber described in Embodiment 1 of the present invention is a double-clad ytterbium-doped silica fiber, and its cross-sectional schematic diagram is as follows figure 1 As shown, the composition of the core 11 is a silica matrix, the active ions are ytterbium ions, the co-dopants are aluminum ions and sodium ions, and the refractive index n 1 is 1.4590; the composition of the inner cladding 12 is pure quartz, and its refractive index n 2 is 1.4576; the composition of the outer cladding 13 is a low refractive index polymer, and the refractive index n 3 is 1.37; the composition of the coating layer 14 is a polymer coating with a high refractive index, and the refractive index n 4 is 1.49.

[0055] The concentration distribution of the active ions in the fiber core is uniform doping of the core, wherein the inner region of the core 11 (i.e. figure 1 The components of the circular area inside the core 11) include: the molar content of the active ion yt...

Embodiment 2

[0066] The active optical fiber described in Embodiment 2 of the present invention is a double-clad ytterbium-doped silica fiber, and its cross-sectional schematic diagram is as follows figure 1 As shown, the composition of the core 11 is a silica matrix, the active ions are ytterbium ions, the co-dopants are aluminum ions and magnesium ions, and the refractive index n 1 is 1.4592; the composition of the inner cladding 12 is pure quartz, and its refractive index n 2 is 1.4576; the composition of the outer cladding 13 is a low refractive index polymer, and the refractive index n 3 is 1.37; the composition of the coating layer 14 is a polymer coating with a high refractive index, and the refractive index n 4 is 1.49.

[0067] The concentration distribution of the active ions in the fiber core is uniform doping of the core, wherein the inner region of the core 11 (i.e. figure 1 The components of the circular area inside the core 11) include: the molar content of the active ion...

Embodiment 3

[0095] The active optical fiber described in Embodiment 3 of the present invention is a double-clad ytterbium-doped silica fiber, and its cross-sectional schematic diagram is as follows figure 1 As shown, the composition of the core 11 is a silica matrix, the active ions are ytterbium ions, the co-dopants are aluminum ions and potassium ions, and the refractive index n 1 is 1.4589; the composition of the inner cladding 12 is pure quartz, and its refractive index n 2 is 1.4576; the composition of the outer cladding 13 is a low refractive index polymer, and the refractive index n 3 is 1.37; the composition of the coating layer 14 is a polymer coating with a high refractive index, and the refractive index n 4 is 1.49.

[0096] The concentration distribution of the active ions in the fiber core is uniform doping of the core, wherein the inner region of the core 11 (i.e. figure 1 The components of the circular area inside the core 11) include: the molar content of the active ion...

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Abstract

The invention discloses a method for inhibiting a photo-darkening effect in an active optical fiber and provides an active optical fiber capable of inhibiting a photo-darkening effect in the active optical fiber and a manufacturing method thereof. Through doping alkaline metal ions which comprise one or more ions in the group consisting of Na ions, K ions, Mg ions, Ca ions, Ba ions and Sr ions into a fiber core in a rare earth doped active fiber manufacturing process, suitable dopant concentration and ratio are determined, the optical alkalinity of an environment where the rare earth ions are located, the photo-darkening additional loss is reduced, and the laser performance of a ytterbium doped fiber has no negative effect. The photo-darkening resistance performance of the active optical fiber prepared by the inhibiting method is greatly improved, compared with convention active optical fiber, the photo-darkening additional loss has an inhibiting effect of larger than 50%, the optical performance and laser efficiency of the optical fiber are not affected by the method, the stability is higher, and the service life is longer.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, and more specifically relates to a method for suppressing the photon darkening effect in an active optical fiber. Background technique [0002] Fiber lasers have the advantages of good heat dissipation, high efficiency, good beam quality, small size, and light weight. They have shown extremely broad application prospects and great application value in the fields of material processing, intelligent manufacturing, medical treatment, and national defense. The development of large mode field active fiber technology and cladding pumping technology as well as high-brightness light-emitting diodes (LD) has further promoted the output power of ytterbium-doped fiber to reach 20kW. The birth and development of fiber lasers has brought profound changes to the modern laser field, and has gradually become the leading force in the laser industry. With the proposal of the Made in China 2025 plan and the r...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B6/036C03C13/04C03B37/014C03B37/02
CPCC03B37/014C03B37/02C03B2201/32C03B2201/50C03B2201/54C03C13/046G02B6/0229G02B6/03633
Inventor 李进延赵楠王一礴刘业辉李海清彭景刚杨旅云戴能利邢颍滨
Owner HUAZHONG UNIV OF SCI & TECH
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