Cladding light filter
By etching three grooves on the surface of the fiber cladding and protecting them with a quartz tube, the filtering efficiency and stability problems of existing cladding optical filters are solved, meeting the requirements of high-brightness, miniaturized fiber lasers and providing efficient and stable cladding optical filtering effect.
Patent Information
- Application Number
- CN202520392322.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-03-07
Smart Images
Figure CN223728019U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to optical fiber laser technical field, especially relate to a cladding light filter. BACKGROUND
[0002] Compared with solid-state laser, optical fiber laser has the advantages of high integration, good beam quality and easy heat dissipation, and is widely used in the fields of laser cutting, laser welding and laser cleaning. The high brightness and miniaturization development trend of optical fiber laser puts higher requirements on the power level, filtering efficiency and production process stability of the cladding light filter.
[0003] At present, the commonly used cladding light filter preparation methods are high-refraction glue coating method, traditional chemical reagent corrosion method and laser etching method. Among them, the laser etching method is divided into carbon dioxide laser etching method and femtosecond laser etching method due to different light sources. Specifically, the high-refraction glue coating method is difficult to be applied to high-power optical fiber laser due to the high-temperature resistance of high-refraction glue itself. The chemical reagent used in the chemical reagent method for preparing the cladding light filter is volatile and corrosive, so that the process is difficult to control and difficult to integrate into an automatic production line, and there are problems of chemical reagent harm to human health and waste liquid pollution to the environment. The carbon dioxide laser etching method for preparing the cladding light filter will cause the deformation of the optical fiber cladding due to the laser thermal effect, which will affect the quality of the laser beam, and there is a problem of high temperature at the output end under high-power cladding light. Although the femtosecond laser etching method for preparing the cladding light filter does not have the laser thermal effect and can maintain the original beam quality unchanged, it will cause the problems of insufficient pump light filtering rate or high temperature at the input end under high-power pump light due to the uniform etching. SUMMARY
[0004] In view of the above problems, the utility model discloses a cladding light filter to overcome the above problems or at least partially solve the above problems.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] The utility model discloses a cladding light filter, which comprises an optical fiber, the optical fiber comprises a fiber core, a cladding and a coating layer arranged in sequence from inside to outside.
[0007] The etching area of the coating layer is formed on the optical fiber, and the cladding in the etching area is provided with a first etching section, a second etching section and a third etching section in sequence along the light transmission direction. A plurality of first grooves are formed on the surface of the cladding at the first etching section. A plurality of second grooves are formed on the surface of the cladding at the second etching section. A plurality of third grooves are formed on the surface of the cladding at the third etching section. The depths of the first grooves, the second grooves and the third grooves increase in sequence.
[0008] Further, the first grooves are uniformly spaced, the second grooves are uniformly spaced, and the third grooves are uniformly spaced.
[0009] Further, the spacing between the first grooves, the spacing between the second grooves, and the spacing between the third grooves are sequentially reduced.
[0010] Further, the first etching section, the second etching section, and the third etching section are adjacently arranged.
[0011] Further, the length of the first etching section, the second etching section, and the third etching section along the axial direction of the optical fiber is 1cm-5cm.
[0012] Further, a plurality of etching regions are formed on the optical fiber, and the etching regions are spaced apart.
[0013] Further, a protective cover is further included.
[0014] The protective cover is sleeved on the optical fiber at the etching region.
[0015] Further, the protective cover is a quartz tube, and the two ends of the quartz tube are bonded and fixed to the coating layers on the two sides of the etching region.
[0016] Further, the length of the quartz tube is 5cm-20cm.
[0017] Further, the first grooves, the second grooves, and the third grooves are formed by femtosecond laser etching.
[0018] The advantages and beneficial effects of the present application are as follows:
[0019] In the cladding light filter of the present application, three grooves with different depths are etched on the surface of the cladding in sequence, so that the cladding light can be scattered out of the cladding in sections, and the cladding light filter has the advantages of high cladding light filtering rate, low filtering cladding light power temperature rise coefficient, simple structure, easy preparation, easy integration and automatic production, etc. BRIEF DESCRIPTION OF DRAWINGS
[0020] 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 accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. Moreover, the same reference numerals are used throughout the drawings to designate similar or equivalent parts. In the drawings:
[0021] Figure 1 FIG. 1 is a structural schematic diagram of a cladding light filter according to an embodiment of the present application.
[0022] Fig. 1, core; 2, cladding; 3, coating layer; 4, first groove; 5, second groove; 6, third groove; 7, quartz tube. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following will combine the utility model specific embodiment and corresponding drawings to make the utility model technical scheme clear and complete. Obviously, the described embodiment is only a part of the utility model embodiment, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.
[0024] The following will combine the drawings to specifically describe the technical scheme provided by each embodiment of the utility model.
[0025] One embodiment of the utility model provides a cladding light filter, as shown in the figure, the cladding light filter comprises an optical fiber, and the optical fiber comprises a core 1, a cladding 2 and a coating layer 3 arranged in sequence from inside to outside. Figure 1
[0026] Specifically, the etching area of removing the coating layer 3 is formed on the optical fiber, the cladding 2 in the etching area is provided with a first etching section, a second etching section and a third etching section in sequence along the light transmission direction (i.e. the transmission direction of light in the optical fiber), the first etching section, the second etching section and the third etching section are all arranged around the cladding 2, the surface of the cladding 2 at the first etching section is formed with a plurality of first grooves 4, the surface of the cladding 2 at the second etching section is formed with a plurality of second grooves 5, the surface of the cladding 2 at the third etching section is formed with a plurality of third grooves 6, the plurality of first grooves 4, the plurality of second grooves 5 and the plurality of third grooves 6 all surround the cladding 2 by 360°, so that the cladding light in the cladding 2 can be scattered out through the first grooves 4, the second grooves 5 and the third grooves 6; and the depth of the first grooves 4, the second grooves 5 and the third grooves 6 increases in sequence, i.e. the first grooves 4, the second grooves 5 and the third grooves 6 are respectively extremely shallow, shallow and deep of three different depths.
[0027] In this way, when the cladding light reaches the first etching section, the plurality of first grooves 4 can filter out 5% to 10% of the cladding light, and can prevent the cladding light scattered by the second etching section from returning to the input stripping port (i.e. Figure 1 In the first etching segment, the left side of the first groove 4 causes the stripping heat; when the cladding light is incident on the second etching segment, the multiple second grooves 5 can filter out 10% to 20% of the cladding light and prevent the cladding light scattered by the third etching segment from returning to the first etching segment, causing the first etching segment to heat up; when the cladding light is incident on the third etching segment, the multiple third grooves 6 can scatter more than 80% of the cladding light into the air, thereby making the cladding light filtering rate of different types of optical fibers higher than 99%, and the temperature rise coefficient of the filtered cladding light power is low. The temperature generated by filtering 500W of cladding light is lower than 30℃, and the temperature rise coefficient is 0.06℃ / W.
[0028] In summary, in the cladding light filter of this embodiment, by sequentially etching three grooves of different depths on the cladding surface, the cladding light can be segmented and scattered out of the cladding in stages. This cladding light filter has the advantages of high cladding light filtering efficiency, low temperature rise coefficient of filtered cladding light power, simple structure, easy fabrication, and easy integration into automated production.
[0029] In this embodiment, as Figure 1 As shown, multiple first grooves 4 are evenly spaced, multiple second grooves 5 are evenly spaced, and multiple third grooves 6 are evenly spaced. That is, the spacing between each first groove 4 is the same, the spacing between each second groove 5 is the same, and the spacing between each third groove 6 is the same. This allows the cladding light at all locations within the cladding 2 to be evenly scattered through the first grooves 4, second grooves 5, and third grooves 6, thereby giving the cladding light filter a higher cladding light filtering rate.
[0030] And, as Figure 1 As shown, the spacing between each first groove 4, the spacing between each second groove 5, and the spacing between each third groove 6 decrease sequentially, resulting in a higher segmented filtering effect for the cladding light.
[0031] Furthermore, the adjacent arrangement of the first, second, and third etched segments makes the cladding optical filter structure more compact and occupies less space. The lengths of the first, second, and third etched segments along the fiber axial direction are all 1cm to 5cm. This size allows the cladding optical filter to simultaneously possess the advantages of small size and high cladding optical filtering efficiency.
[0032] In other embodiments, multiple etched regions are formed on the optical fiber, and the multiple etched regions are spaced apart, thereby further improving the cladding light filtering efficiency of the cladding optical filter.
[0033] In this embodiment, the cladding light filter also includes a protective cover.
[0034] The protective cover is sleeved on the optical fiber at the etching area, and the protective cover protects the first groove, the second groove and the third groove, prevents dust particles from entering the first groove, the second groove and the third groove, and ensures that the cladding light filter can continuously and efficiently work.
[0035] Further, the protective cover is a quartz tube 7, so that the stripped cladding light can pass through the quartz tube 7 and be absorbed by the surrounding environment, such as Figure 1 As shown, the two ends of the quartz tube 7 are respectively bonded and fixed with the coating layers 3 on both sides of the etching area, the quartz tube 7 and the coating layer 3 are specifically bonded through low-refraction glue, and are cured through ultraviolet irradiation, so as to realize the packaging of the cladding light filter. The length of the quartz tube is 5cm-20cm.
[0036] In addition, the first groove, the second groove and the third groove are formed by femtosecond laser etching, the femtosecond laser is cold-processed on the cladding surface, so that the cladding is not deformed, and the quality of the laser beam is not affected; and when the cladding light filter is prepared by femtosecond laser etching, there is no need for close contact with the human body, and it is harmless to the human body and the environment.
[0037] It should be noted that when the first groove, the second groove and the third groove are formed by femtosecond laser etching, a rotary etching method is adopted, that is, the optical fiber is rotated by a certain angle, the femtosecond laser etches the first groove, the second groove and the third groove on one side of the cladding, then the optical fiber is rotated by a certain angle, and the femtosecond laser etches the first groove, the second groove and the third groove on the other side of the cladding; for example, the optical fiber with a cladding diameter of 250μm is rotated once, and the rotation degree is 180° each time, so as to realize 360° groove full etching coverage; the optical fiber with a cladding diameter of 400μm is rotated twice, and the rotation degree is 120° each time, so as to realize 360° groove full etching coverage.
[0038] The above is only a specific embodiment of the present application, and those skilled in the art can make other improvements or modifications on the basis of the above embodiment under the above teaching of the present application. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present application, and the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A cladding light filter comprising: The optical fiber comprises a fiber core, a cladding layer and a coating layer arranged from inside to outside in sequence. An etching area where the coating layer is stripped is formed on the optical fiber, the cladding layer in the etching area is sequentially provided with a first etching section, a second etching section and a third etching section along the light transmission direction, a plurality of first grooves are formed on the surface of the cladding layer at the first etching section, a plurality of second grooves are formed on the surface of the cladding layer at the second etching section, a plurality of third grooves are formed on the surface of the cladding layer at the third etching section, and the depths of the first grooves, the second grooves and the third grooves increase in sequence.
2. The cladding light filter according to claim 1, wherein The plurality of first grooves are uniformly spaced, the plurality of second grooves are uniformly spaced, and the plurality of third grooves are uniformly spaced.
3. The cladding light filter according to claim 2, wherein The spacing between each first groove, the spacing between each second groove and the spacing between each third groove decrease in sequence.
4. The cladding light filter of claim 1, wherein The first etching section, the second etching section and the third etching section are adjacently arranged.
5. The cladding light filter of claim 1, wherein, The length of the first etching section, the second etching section and the third etching section along the axial direction of the optical fiber is 1cm-5cm.
6. The cladding light filter of claim 1, wherein, A plurality of etching areas are formed on the optical fiber, and the plurality of etching areas are spaced.
7. The cladding light filter of claim 1, wherein Further comprising a protective cover; The protective cover is sleeved on the optical fiber at the etching area.
8. The cladding light filter of claim 7, wherein, The protective cover is a quartz tube, and the two ends of the quartz tube are respectively bonded and fixed with the coating layers on both sides of the etching area.
9. The cladding light filter of claim 8, wherein, The length of the quartz tube is 5cm-20cm.
10. The cladding light filter according to any one of claims 1 to 9, characterized in that, The first grooves, the second grooves and the third grooves are formed by femtosecond laser etching.