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Coreless optical fiber-based pumping and signal beam combiner and preparation method thereof

A coreless fiber and beam combiner technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of high-efficiency transmission of pump light and signal light, and the inability of fiber bundles to be uniformly arranged. Achieve the effect of improving beam quality, improving signal optical coupling efficiency, high applicability and matching degree

Active Publication Date: 2020-11-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main problem to be solved by the present invention is: in the preparation process of the pump and signal combiner, when the cladding dimensions of the pump injection fiber and the signal fiber do not satisfy the constraint relationship, the problem that the fiber bundles cannot be uniformly arranged will be encountered , making it difficult to achieve high-efficiency transmission of pump light and signal light

Method used

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  • Coreless optical fiber-based pumping and signal beam combiner and preparation method thereof
  • Coreless optical fiber-based pumping and signal beam combiner and preparation method thereof
  • Coreless optical fiber-based pumping and signal beam combiner and preparation method thereof

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Embodiment 1

[0039]The pump and signal combiner in Embodiment 1 is (6+1)×1 type. Wherein, the original pumping fiber is a 220 / 242 μm (NA=0.22) multimode fiber. The cladding diameter of the coreless fiber can be selected between 242-250 μm, and the numerical aperture is 0.46NA. The core / cladding diameter of the signal fiber is 30 / 250 μm, corresponding to the numerical aperture (NA) of 0.06 / 0.46. The core / cladding diameter of the pump output fiber is 20 / 400 μm, and the corresponding numerical aperture (NA) is 0.06 / 0.46. The specific production steps are as follows:

[0040] S1: The six pump injection fibers used in the preparation of the beam combiner are all formed by fusion splicing the original pump fiber and the coreless fiber. figure 2 It is a schematic diagram of the fusion splicing structure of the original pump fiber and the coreless fiber. Wherein, 21 is a schematic diagram of the original pumping fiber with the coating layer removed, and the general length is 10 mm. 22 is a s...

Embodiment 2

[0047] The pump and signal combiner in embodiment 2 is (6+1)×1 type. Wherein, the original pumping fiber is a 220 / 242 μm (NA=0.22) multimode fiber. The coreless fiber has a cladding diameter of 160 μm and a numerical aperture of 0.46NA. The core / cladding diameter of the signal fiber is 25 / 250μm, corresponding to the numerical aperture (NA) of 0.06 / 0.46. The core / cladding diameter of the pump output fiber is 20 / 400 μm, and the corresponding numerical aperture (NA) is 0.06 / 0.46. The specific production steps are as follows:

[0048] S1: The six pump injection fibers used in the preparation of the beam combiner are all formed by fusion splicing the tapered original pump fiber and the coreless fiber. Strip off the coating layer of the original pump fiber by 20-30mm, and taper the original pump fiber, so that the diameter of the fiber taper waist after tapering is about 160μm, the length of the equal diameter area is about 2mm, and the transition between the left and right sides...

Embodiment 3

[0054] The pump and signal combiner in Embodiment 3 is (6+1)×1 type. Wherein, the original pumping fiber is a 220 / 242 μm (NA=0.22) multimode fiber. The coreless fiber has a cladding diameter of 125 μm and a numerical aperture of 0.46NA. The core / cladding diameter of the signal fiber is 10 / 125μm, corresponding to the numerical aperture (NA) of 0.08 / 0.46. The core / cladding diameter of the pump output fiber is 20 / 400 μm, and the corresponding numerical aperture (NA) is 0.06 / 0.46. The specific production steps are as follows:

[0055] S1: The six pump injection fibers used in the preparation of the beam combiner are all formed by fusion splicing the tapered original pump fiber and the coreless fiber. Strip the coating layer of the original pump fiber by 20-30mm, and taper the original pump fiber, so that the diameter of the fiber taper waist after tapering is about 125μm, the length of the equal-diameter area is about 2mm, and the transition between the left and right sides Th...

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Abstract

The invention discloses a coreless optical fiber-based pumping and signal beam combiner and a preparation method of. The combiner comprises a signal optical fiber (32), a plurality of pumping injection optical fibers (31) and an output optical fiber (35), and comprises the following specific operation steps of S1, welding an original pumping optical fiber and a coreless optical fiber to form a pumping injection optical fiber; S2, processing a cladding of the signal optical fiber to form a section of equal-diameter area; S3, uniformly arranging a plurality of pumping injection optical fibers around the signal optical fiber to form an optical fiber bundle, twisting the optical fiber bundle through a positioning clamp, and then performing fused biconical taper treatment on the optical fiber bundle; and S4, cutting off the optical fiber bundle subjected to fused biconical taper at the taper waist, and welding the optical fiber bundle with the output optical fiber to form the beam combiner.According to the invention, the problem that the pumping optical fibers and the signal optical fibers cannot be uniformly arranged when the diameters do not meet the constraint relationship is effectively solved.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, and more specifically relates to a pump and signal beam combiner based on a coreless optical fiber and a preparation method thereof. Background technique [0002] The pump and signal beam combiner is one of the core components of the all-fiber laser system. It is mainly used for combining pump light and coupling transmission of signal light. Its performance will directly determine the output power and beam quality of the fiber laser. the size of. At present, there are two main methods of pump light coupling for beam combiners: end-pumping and side-pumping. End-pumping refers to combining multiple beams of pumping light into the cladding of the double-clad fiber from the end face. At present, the method of fusion tapering is mostly used, that is, multiple pump fibers are evenly and closely arranged around the signal fiber to form a fiber bundle for fusion tapering, and then cut at the waist...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/00
CPCH01S3/06708H01S3/0071
Inventor 何兵刘奕利刘恺周军
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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