CN102508336A

CN102508336A - Pump optical fiber combiner and preparation method thereof

Info

Publication number: CN102508336A
Application number: CN2011103616098A
Authority: CN
Inventors: 赵保银; 段开椋; 张恩涛; 赵卫; 闫红卫; 杨合宁
Original assignee: XiAn Institute of Optics and Precision Mechanics of CAS
Current assignee: XiAn Institute of Optics and Precision Mechanics of CAS
Priority date: 2011-11-15
Filing date: 2011-11-15
Publication date: 2012-06-20

Abstract

The invention relates to an N×1 pumping fiber beam combiner which can be used for making a high-power fiber laser and a preparation method thereof. The pumping fiber beam combiner has no melting point. The invention provides a pumping fiber beam combiner which has lower insertion loss and can be used to manufacture high-power fiber lasers and a preparation method thereof.

Description

A kind of pumping optical fiber bundling device and preparation method thereof

Technical field

The invention belongs to the optical fiber technology field, relate to a kind of optical-fiber bundling device (fiber combiner), relate in particular to a kind of N * 1 pumping optical fiber bundling device that can be used for making high power fiber laser and preparation method thereof.

Background technology

Full-optical-fiber laser is owing to have advantages such as compact conformation, stable performance, good beam quality, thereby is widely used in fields such as industrial processes, medical engineering, modern national defenses.At present, the nearly myriawatt of single fiber output power of full-optical-fiber laser has formed a huge industry in the world.

Business-like full-optical-fiber laser adopts the structure like Fig. 1 usually.Fiber grating FBG1 and FBG2 constitute a pair of chamber mirror of fiber laser, and wherein high anti-end chamber mirror FBG1 has higher reflectivity (like reflectivity 99.9%) to laser, and FBG2 has lower reflectivity (like reflectivity 10%) to laser, is the output cavity mirror of laser instrument.OC is the laser output collimator.The large power pumping optical that the semiconductor pumping module LD of tail optical fiber output sends is realized the pumping to gain fibre F through optical-fiber bundling device C1 and C2.The large-power optical fiber bundling device has N * 1 (like bundling device C1) and (N+1) * 1 (bundling device C2) two kinds of structures usually.

Generally all adopt to draw when utilizing prior art to make optical-fiber bundling device and bore fusing mode again.Fig. 2 is the manufacturing process and the principle of work of example explanation N * 1 optical-fiber bundling device with 7 * 1 structures.When making bundling device, earlier seven pumping multimode optical fiber p1-p7 among Fig. 2 (a) are bundled into a fibre bundle (its xsect such as Fig. 2 (b)), use optical fiber to draw the awl machine that fibre bundle is drawn awl then.After drawing awl, fibre bundle in the cutting of the appropriate location in awl district, is welded together at section part and multimode optical fiber p8 then.Like this, just the pump light that transmits among the seven root multimode fiber p1-p7 is coupled in the inner cladding of output optical fibre p8 and transmits.

Utilize the optical-fiber bundling device of above-mentioned technology formerly development can not carry bigger pump power; Main cause be in the optical-fiber bundling device manufacturing process carry out fibre bundle draw awl after again during welding; There is the splice loss, splice attenuation of any in the weld place, and the heat generating spot at weld place is more concentrated, like this when passing through bigger pump power; The weld place can produce a large amount of heat, causes optical-fiber bundling device to burn.

Summary of the invention

In order to solve the above-mentioned technical matters that exists in the background technology, the invention provides and a kind ofly have than low insertion loss and can be used for pumping optical fiber bundling device of making high power fiber laser and preparation method thereof.

Technical solution of the present invention is: the invention provides a kind of pumping optical fiber bundling device, its special character is: said pumping optical fiber bundling device is no fusing point.

Above-mentioned pumping optical-fiber bundling device length is 0.1m-50m.

A kind of preparation method of pumping optical fiber bundling device, its special character is: said preparation method may further comprise the steps:

1) many root multimode fibers is formed fibre bundle;

2) slowly draw awl also finally to be drawn into the simple optical fiber of certain diameter the resulting fibre bundle of step 1).

Above-mentioned steps 2) awl that draws described in is to carry out under the condition that in smelting furnace, heats.

Above-mentioned preparation method is in step 2) also comprise afterwards:

3) to step 2) resulting drawing optical fiber uses low-refraction glue to apply, to strengthen transmission reflection of light and the physical strength that increases optical fiber.

Above-mentioned steps 3) be that to adopt refractive index be that 1.46 low-refraction glue applies.

Advantage of the present invention is:

Pump combiner provided by the present invention is after many root multimode fibers are formed fibre bundle, to adopt certain optical-fiber processing equipment and processing technology in the scope of growing (such as 0.1m-50m), fibre bundle to be drawn again, directly is drawn into an optical fiber.This technology difference with the prior art is: prior art is that fibre bundle is drawn awl in short scope, and cutting then is again with another fused fiber splice; And the present invention is to be that fibre bundle directly is drawn into an optical fiber in long scope with fibre bundle.There is not fusing point in the optical-fiber bundling device that utilizes the present invention to make, does not have splice loss, splice attenuation, and the heat that compositor produces can be dispelled the heat in long scope, so just solved formerly the bundling device weld of fabrication techniques generate heat too concentrated, and the problem that can't dispel the heat rapidly.No fusing point pump combiner of the present invention can be used for developing the full-optical-fiber laser of super high power.

Description of drawings

Fig. 1 is the general structural representation of full-optical-fiber laser;

Fig. 2 is a prior art pump combiner structural representation;

Fig. 3 is a pump combiner structural representation provided by the invention.

Embodiment

Referring to Fig. 3, the present invention forms fibre bundle with N root (N=7) multimode optical fiber p1-p7 earlier when making optical-fiber bundling device, utilize heating furnace that fibre bundle is slowly drawn awl then, and finally be drawn into the simple optical fiber of certain diameter, referring to Fig. 3 (a).The pump light that transmits among N root (N=7) the multimode optical fiber p1-p7 so just integrates, and has realized the bundle that closes of multichannel pump light.N root multimode fiber used in the present invention can be single cladded-fiber, like Fig. 3 (b); Also can be unclad fiber, like Fig. 3 (c).After draw accomplishing, in order to strengthen transmission reflection of light and the physical strength that increases optical fiber, also on the optical fiber that draws moulding, adopting refractive index is that 1.46 low-refraction glue applies.

The bundling device of this fabrication techniques is that multifiber directly is drawn into an optical fiber in essence, weldless point in whole bundling device, and the insertion loss of bundling device only derives from the awl district loss of pumping optical fiber bundle.Compare with existing pump combiner; The made insertion loss of making no fusing point pump combiner of the present invention reduces greatly, and does not concentrate the fusing point of heating, therefore; Such pump combiner can be carried bigger pump power, can be used for making more powerful fiber laser.

Claims

1. pumping optical fiber bundling device is characterized in that: said pumping optical fiber bundling device is no fusing point.

2. pumping optical fiber bundling device according to claim 1 is characterized in that: said pumping optical fiber bundling device length is 0.1m-50m.

3. preparation method who is used to realize claim 1 or 2 described pumping optical fiber bundling devices, it is characterized in that: said preparation method may further comprise the steps:

1) many root multimode fibers is formed fibre bundle;

4. the preparation method of pumping optical fiber bundling device according to claim 3 is characterized in that: the awl that draws said step 2) is to carry out under the condition that in smelting furnace, heats.

5. the preparation method of pumping optical fiber bundling device according to claim 4 is characterized in that: said preparation method is in step 2) also comprise afterwards:

3) to step 2) resulting drawing optical fiber applies.

6. the preparation method of pumping optical fiber bundling device according to claim 5 is characterized in that: said step 3) is that to adopt refractive index be that 1.46 low-refraction glue applies.