CN218213512U - Cladding light stripper - Google Patents

Abstract

The utility model discloses a covering light stripper. The cladding light stripper comprises an optical fiber, wherein the optical fiber comprises a fiber core, an inner cladding and a coating layer; the inner cladding wraps up in the outside of fibre core, and the coating wraps up in the outside of inner cladding, has the cladding light that the coating was peeled off the district section on the optic fibre, is equipped with the destroyed inner cladding of at least one section inner cladding transmission interface total reflection characteristic on the lateral wall of the inner cladding in the cladding light peeling off district section, and a plurality of inner cladding cavitys have been seted up to the inside of the inner cladding in the inner cladding texturing district section. The cladding light stripping has the advantages of simple structure, small volume, easy processing, high cladding light stripping power and the like.

Description

Cladding light stripper

Technical Field

The utility model belongs to the technical field of the laser instrument, in particular to covering light stripper.

Background

In the process of generating laser by the fiber laser, the energy of the pump light and the signal light is transferred in the doped fiber, the pump light is weakened, and the signal light is strengthened. Because the pumping energy cannot be absorbed completely, residual pumping light is transmitted in a cladding of the optical fiber to form cladding light, and the cladding light not only influences the quality of laser output by the laser, but also may damage subsequent devices. Generally, the cladding light in the cladding of the optical fiber is stripped by a cladding light stripper, and the main action principle of the cladding light stripper is to strip the cladding light by destroying the total reflection interface between the cladding of the optical fiber, so as to eliminate the influence of the cladding light on the quality of the output light beam of the laser.

At present, through the recess that the district's setting has certain degree of depth is peeled off at the covering light, utilize the scattering that the covering light formed after getting into the recess, peel away the covering light from the covering in, in order to guarantee to the efficiency of peeling off of covering light, the distribution region that needs the degree of depth of increase recess and extension recess usually, can make more covering light and recess form the contact like this and take place the scattering, improve the effect of peeling off, but can lead to bulky, prepare complicacy.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention discloses a cladding light stripper to overcome or at least partially solve the above problems.

In order to realize the purpose, the utility model adopts the following technical scheme:

the utility model provides a cladding light stripper, which comprises an optical fiber, wherein the optical fiber comprises a fiber core, an inner cladding and a coating layer;

the inner cladding wraps the outer side of the fiber core, the coating wraps the outer side of the inner cladding, the optical fiber is provided with a cladding light stripping section with the coating stripped, the outer side wall of the inner cladding in the cladding light stripping section is provided with at least one section of inner cladding roughened section with damaged inner cladding transmission interface total reflection characteristics, and a plurality of inner cladding cavities are formed in the inner cladding roughened section.

Further, the inner cladding cavities are different in size.

Further, the inner cladding cavities are spaced at different distances in the axial direction of the inner cladding.

Further, the coating layer on the cladding light stripping section is stripped through a method of thermal stripping, blade stripping or chemical stripping.

Further, the inner cladding roughened section is formed by femtosecond laser firing.

Further, the inner cladding cavity is formed by femtosecond laser firing.

Further, the optical fiber further comprises an outer cladding;

the outer cladding layer is positioned between the inner cladding layer and the coating layer, and at least one section of outer cladding layer texturing section with damaged outer cladding layer transmission interface total reflection characteristics is arranged on the outer side wall of the outer cladding layer.

Further, a plurality of surrounding layer cavities are opened to the inside of the surrounding layer in the surrounding layer frosted section.

Further, the length of the cladding light stripping section is 5 mm-50 mm.

The utility model has the advantages and beneficial effects that:

the utility model discloses an among the cladding light stripper, through set up one section at least inner cladding transmission interface total reflection destroyed inner cladding texturing section on the cladding light stripping section that strips the coating to the inside of the inner cladding in inner cladding texturing section sets up a plurality of inner cladding cavitys, makes the intraformational cladding light of inner cladding take place the scattering through the inner cladding cavity, is stripped away by inner cladding texturing section again, so not only can make the stripping effect of cladding light better, but also shortened the axial length of inner cladding texturing section; the cladding light stripping has the advantages of simple structure, small volume, easy processing, high cladding light stripping power and the like.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic diagram of a cladding light stripper according to an embodiment of the present invention;

fig. 2 is a diagram illustrating the steps of the method for manufacturing the middle cladding light stripper of the present invention.

In the figure: 1. a fiber core; 2. an inner cladding; 3. a coating layer; 4. an inner cladding roughened section; 5. the inner cladding cavity.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to perform clear and complete description of the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a cladding light stripper, which includes an optical fiber including a fiber core 1, an inner cladding 2 and a coating layer 3, as shown in fig. 1.

Specifically, inner cladding 2 wraps up in the outside of fibre core 1, and coating 3 wraps up in the outside of inner cladding 2, has the cladding light that coating 3 was peeled off the district's section on the optic fibre, is equipped with one section inner cladding transmission interface total reflection characteristic destroyed inner cladding texturing section 4 on the lateral wall of inner cladding 2 in the cladding light peeling off the district's section, and a plurality of inner cladding cavities 5 have been seted up to inner cladding 2's in the inner cladding texturing section 4 inside. Thus, when a part of the cladding light transmitted in the inner cladding 2 is reflected to the inner cladding roughened section 4, the part of the cladding light is emitted through the inner cladding roughened section 4, and the cladding light is stripped; the other part of the cladding light transmitted in the inner cladding 2 is scattered when the cladding light enters the inner cladding cavity 5, and the generated scattered light is emitted through the inner cladding roughened section 4, so that the cladding light is stripped, and the stripping degree of the cladding light is higher. And, through the setting of inner cladding cavity, can reduce the required length of inner cladding texturing section 4 in the axial, and then make cladding light stripper's volume littleer. In addition, the arrangement of the inner cladding roughened section and the inner cladding cavity does not damage the integral structure of the inner cladding, so that the inner cladding still has better mechanical performance. Therefore, the cladding light stripper has the advantages of simple structure, small volume, easy processing, high cladding light stripping power and the like.

In other embodiments, the outer sidewall of the inner cladding in the cladding light stripping section can also be provided with an inner cladding roughened section with destroyed total reflection characteristic of the multi-section inner cladding transmission interface.

In this embodiment, the size difference of a plurality of inner cladding cavities makes the intraformational cladding light of inner cladding take place the scattered angle through different inner cladding cavities different, and then makes the scope of scattered light scattering bigger to the scattered light that the cladding light of being convenient for produced jets out through inner cladding roughened area better, makes the stripping effect of cladding light better.

In addition, the spacing distances of the inner cladding cavities in the axial direction of the inner cladding are different, so that cladding light with different reflection angles in the inner cladding can be scattered and stripped, and the stripping degree of the cladding light is improved. Of course, in other embodiments, the plurality of inner cladding cavities may be equally spaced in the axial direction of the inner cladding, and the present invention is also within the protection scope of the present invention.

In the embodiment, the coating on the cladding light stripping section is stripped by a thermal stripping method, a blade stripping method or a chemical stripping method, and the coating stripping method is simple to operate and has a better stripping effect. Here, it is necessary to maintain the peel opening uniformly and completely without burrs when peeling off the coating layer. The length of the clad light-peeling section is 5mm to 50mm, and the clad light-peeling section having the length can realize clad light peeling and can be easily processed.

Furthermore, the inner cladding roughened section is formed by femtosecond laser firing, and a uniform roughened structure can be formed on the outer side wall of the inner cladding by the femtosecond laser, so that the integral uniformity of the inner cladding is ensured. Of course, the inner cladding roughened section can be processed by other processing methods, and is not limited to being fired by a femtosecond laser.

And the inner cladding cavity is formed by the femtosecond laser firing, and due to the characteristics of the femtosecond laser, the inner cladding cavity only has the cauterizing capacity at the focusing position, and particularly, the femtosecond laser can penetrate through the outer surface layer of the inner cladding and fire the inner cladding cavity in the inner cladding, so that the fixed-point firing is realized, the damage to other structures is avoided, and the integrity of the integral structure of the inner cladding is ensured.

Femtosecond laser, as a processing technology, has proven to be a powerful tool for advanced material processing on the micro-nano scale. Femtosecond laser refers to ultrashort pulse laser with extremely narrow pulse width generated by mode locking technology, and the pulse width is usually defined as picosecond (10) ^-12 s) -femtosecond (10) ^-15 s) order, femtosecond lasers have many unique properties: (1) On a time scale, the ultra-short pulse width of the femtosecond laser limits the formation of a heat affected zone, which is crucial to ultra-high precision manufacturing; (2) On the spatial scale, the femtosecond laser and the material act to embody various nonlinear processes, such as nonlinear optical absorption, nonlinear chemical reaction, nonlinear material modification and the like, and the nonlinear processes can break the optical diffraction limit to realize the preparation of the nano-scale microstructure; (3) In the dimension of the material, the extremely high peak intensity allows the laser to perform nonlinear interaction with almost any substance, namely when the femtosecond laser irradiates transparent materials such as a medium, a wide-band gap crystal and the like, a nonlinear absorption process can be generated due to the extremely high peak intensity of the laser, so that strong light absorption is caused; based on the characteristic, the femtosecond laser can realize the processing and modification of the interior of the transparent material.

In this embodiment, the optical fiber further comprises an outer cladding.

Specifically, the outer cladding is located between the inner cladding and the coating, and the outer side wall of the outer cladding in the cladding light stripping section is provided with at least one section of outer cladding roughened section with the total reflection characteristic of the outer cladding transmission interface destroyed, so that the cladding light in the outer cladding can be emitted out through the outer cladding roughened section, and the stripping of the cladding light in the outer cladding is realized. In addition, the cladding light in the inner cladding is emitted into the outer cladding through the inner cladding roughened section and then is emitted through the outer cladding roughened section, and the stripping of the cladding light in the inner cladding is realized. The outer cladding roughened section corresponds to the inner cladding roughened section in position, so that cladding light in the inner cladding can conveniently penetrate through the outer cladding for scattering and stripping.

And, a plurality of surrounding layer cavitys have been seted up to the inside of the surrounding layer in the surrounding layer texturing section, and is the same with the theory of action of above-mentioned surrounding layer cavity, and the setting of surrounding layer cavity can improve the interior cladding light of surrounding layer's degree of peeling off.

Further, the outer cladding roughened section and the outer cladding cavity are formed by burning through femtosecond laser, so that the integral structure of the outer cladding is not damaged, the inner cladding and the outer cladding are burnt to form a cladding light stripping structure, the integrity of the outer cladding structure is ensured, and the mechanical performance of the optical fiber is better.

As shown in fig. 2, the clad light stripper in the above embodiment was prepared by the following preparation method:

and step S01, stripping the coating layer of the optical fiber to form a cladding light stripping section, so that a cladding light stripping structure can be conveniently manufactured on the cladding light stripping section.

And S02, setting the exposure power and the focusing position of the femtosecond laser, and burning at least one section of inner cladding roughened section on the outer side wall of the inner cladding in the cladding light stripping section. The exposure power is determined according to the material of the inner cladding and the depth of the inner cladding roughened area to be fired, and the focusing position is determined according to the position of the inner cladding roughened area to be fired.

And S03, adjusting the exposure power and the focusing position of the femtosecond laser, and burning a plurality of inner cladding cavities in the inner cladding roughened section.

The preparation method of the cladding light stripper has the advantages of simple operation, high preparation efficiency, capability of being used for streamlined production and the like.

In view of the above, it is only the specific embodiments of the present invention that other modifications and variations can be made by those skilled in the art based on the above-described embodiments in light of the above teachings. It should be understood by those skilled in the art that the detailed description above is only for the purpose of better explaining the present invention, and the scope of protection of the present invention should be subject to the scope of protection of the claims.

Claims (9)

1. A cladding light stripper comprising an optical fiber comprising a core, an inner cladding, and a coating layer;

the inner cladding wraps the outer side of the fiber core, the coating wraps the outer side of the inner cladding, the optical fiber is provided with a cladding light stripping section with the coating stripped, the outer side wall of the inner cladding in the cladding light stripping section is provided with at least one section of inner cladding roughened section with damaged inner cladding transmission interface total reflection characteristics, and a plurality of inner cladding cavities are formed in the inner cladding roughened section.

2. The cladding light stripper of claim 1, wherein the plurality of inner cladding cavities are different sizes.

3. The cladding light stripper of claim 1, wherein the plurality of inner cladding cavities are spaced at different distances in an axial direction of the inner cladding.

4. The cladding light stripper of claim 1, wherein the coating on the cladding light stripping section is stripped by thermal stripping, blade stripping, or chemical stripping.

5. The cladding light stripper of claim 1, wherein the inner cladding roughened section is formed by femtosecond laser firing.

6. The cladding light stripper of claim 1, wherein the inner cladding cavity is formed by femtosecond laser firing.

7. The cladding light stripper of any of claims 1-6, wherein the optical fiber further comprises an outer cladding;

the outer cladding layer is positioned between the inner cladding layer and the coating layer, and at least one section of outer cladding layer texturing section with damaged outer cladding layer transmission interface total reflection characteristics is arranged on the outer side wall of the outer cladding layer.

8. The cladding light stripper of claim 7, wherein a plurality of cladding cavities are opened inside the cladding in the cladding roughened section.

9. The cladding light stripper of any of claims 1-6, wherein the cladding light stripping section has a length of 5mm to 50mm.

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