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Single-mode pumping beam combiner

A beam combiner, single-mode technology, applied in the optical field, can solve the problems of low redundancy, high power, and the pump beam combiner cannot carry the load, so as to reduce the insertion loss and avoid thermal damage.

Inactive Publication Date: 2011-11-09
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The carrying power of the multimode pump combiner is limited, and one of the important reasons is that the Lagrang amount (fiber group aperture × numerical aperture of the fiber) of the N pump fiber groups used to make the multimode pump combiner is relatively large , so that their redundancy is too small when they are fused with the signal output fiber s2 after being fused and tapered, so the insertion loss of the fabricated pump combiner will be very large, resulting in the pump combiner not being able to carry a large power

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  • Single-mode pumping beam combiner
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Embodiment Construction

[0012] see image 3 , the present invention provides a single-mode pump beam combiner, which is mainly different from the prior art in that the pump fiber is no longer a multi-mode fiber, but a single-mode fiber or a near-single-mode fiber. The pump light is transmitted in the cores of the single-mode fibers p1, p2, p3, p4, p5, p6, and then coupled to the inner cladding of the signal output fiber s2 through the tapered region. Since the single-mode fiber core diameter is small, generally about 10um, the cross-section before tapering is as follows image 3 (b) shown. The numerical aperture is also small, generally 0.06um ~ 0.08um, so the fiber group composed of N pump fibers has a small Lagrang daily load, and they have a large redundancy when they are fused with the signal output fiber s2 after fusing the tapered , under the same manufacturing process conditions, the insertion loss of the single-mode pump combiner of the present invention can be greatly reduced, such a pump ...

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Abstract

The invention provides a single-mode pumping beam combiner, which comprises a pumping optical fiber, wherein the pumping optical fiber is in a single mode or a near single mode. In the single-mode pumping beam combiner, a single-mode optical fiber is taken as a pumping optical fiber, so that the structure of the conventional beam combiner is changed fundamentally, the insertion losses of the pumping beam combiner can be greatly lowered under the same process condition, and thermal damage caused by ultrahigh passing power can be avoided. The single-mode pumping beam combiner can be used for developing ultrahigh-power optical fiber lasers.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a pump beam combiner, in particular to a single-mode pump beam combiner which can be used to manufacture high-power all-fiber lasers. Background technique [0002] Due to its excellent beam quality, fiber lasers have been widely used in industrial processing, medical engineering, modern defense and other fields, and are used for cutting, welding and laser marking of metal and other materials. [0003] Commercial fiber lasers are all-fiber structures, such as figure 1 shown. figure 1 Among them, FBG1 and FBG2 are two fiber gratings, FBG1 has high reflection to laser light (for example, the reflectivity is 99.9%), and FBG2 has low reflection to laser light (for example, 10%). FBG1 and FBG2 constitute a pair of cavity mirrors of the fiber laser. OC is the output collimator. The pump light emitted by the semiconductor laser LD is used to pump the gain fiber F through the pump beam combiner. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/094H01S3/067
Inventor 段开椋赵保银赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI