CN110808527A - Cladding light stripping device and processing method thereof - Google Patents
Cladding light stripping device and processing method thereof Download PDFInfo
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- CN110808527A CN110808527A CN201911050679.4A CN201911050679A CN110808527A CN 110808527 A CN110808527 A CN 110808527A CN 201911050679 A CN201911050679 A CN 201911050679A CN 110808527 A CN110808527 A CN 110808527A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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Abstract
The invention relates to the technical field of fiber lasers, and discloses a cladding light stripping device and a processing method thereof, wherein the cladding light stripping device comprises: a passive optical fiber; the middle section of the passive optical fiber cladding is provided with a plurality of etching areas; the etching regions are sequentially connected along the laser transmission direction, and the grain density of the etching regions gradually increases along the laser transmission direction. The cladding light stripping device provided by the invention can damage the smoothness of the surface structure by etching lines on the surface of the cladding, so that laser with a poor mode in the cladding and unabsorbed pump light can not meet the total reflection and can be transmitted out. Meanwhile, the sparse lines are etched at the position where the cladding light is strong to reduce the stripping amount, and the dense lines are etched at the position where the cladding light is weak to increase the stripping amount. Therefore, the hidden trouble of overhigh local temperature of the device is solved, the temperature of the whole stripping device is reduced, the service life of a device is prolonged, the efficiency of stripping cladding light is increased, and the beam quality of a laser is improved.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a cladding light stripping device and a processing method thereof.
Background
The fiber laser has the advantages of high conversion efficiency, good beam quality, compact structure, convenient heat dissipation and the like, so that the application of the fiber laser is not limited to the industrial aspects of cutting, welding and the like any more, the fiber laser is widely applied to the fields of communication, sensing, medical treatment, military and the like, and meanwhile, the development of a plurality of emerging industries is driven. With the continuous increase of the power of high-power fiber lasers, higher requirements are placed on core devices of the lasers, such as beam combiners, fiber gratings, gain fibers and the like. In order to obtain high-power and high-beam-quality laser, the cladding light needs to be filtered by the mode stripping device, and the higher the laser power is, the higher the requirement on the cladding stripping device is.
The principle of the cladding light stripping is that the total reflection condition of the cladding light is destroyed by destroying the cladding structure of the optical fiber or coating a high-refractive index material on the surface of the cladding, so that the cladding light is leaked out, and the transmission of the core laser is not influenced. According to the principle, laser with a poor mode transmitted in the cladding of the optical fiber and pump light which is not absorbed by the gain optical fiber are stripped by the technology, and laser components with a good fiber core transmission mode are obtained. The cladding light stripping technology is always a problem that a high-power optical fiber laser is difficult to overcome, and is particularly embodied in kilowatt level, and is mainly characterized in that the stripped light is too strong, the converted heat is too high, and the device is burnt out, so that other devices of the laser are burnt out together, and huge loss is caused.
The traditional cladding light stripping technology is mainly characterized in that a high-refractive-index material is coated on the surface of a fiber cladding, so that cladding light can not meet the requirement of total reflection and is transmitted out; the defects are that the high-refractive index material absorbs light to a certain extent, so that the temperature of the cladding light stripping part is too high, the burning point of the high-refractive index material is lower, and the device is easily burnt out under a high-power optical fiber laser. The existing cladding light stripping technology is to etch lines on the surface of a cladding, destroy the flatness of the surface of the cladding and enable the cladding light not to meet total reflection, but most etching methods adopt uniform etching. If the texture etching of the cladding is too dense, the stripping amount of the front end of the device is too large, so that the local temperature is too high, and the back end of the device cannot play a role too much; if the grain etching of the cladding is too sparse, the light stripping of the cladding is incomplete, and the quality of light beams is influenced.
Disclosure of Invention
Technical problem to be solved
In view of the above technical drawbacks and requirements, the present application provides a cladding light stripping apparatus and a processing method thereof to solve the problem of over-high local temperature of the stripping apparatus, reduce the overall temperature of the stripping apparatus,
(II) technical scheme
To solve the above problems, the present invention provides a cladding light-stripping apparatus, comprising: a passive optical fiber;
the middle section of the passive optical fiber cladding is provided with a plurality of etching areas; the etching regions are sequentially connected along the laser transmission direction, and the grain density of the etching regions gradually increases along the laser transmission direction.
Further, the plurality of etching regions includes: a first etching region and a second etching region; the first etching area and the second etching area are sequentially connected along the laser transmission direction; the first etching area etches the cladding in the incident direction, and the second etching area etches the cladding in the emergent direction; the texture density etched in the second etching area is larger than that etched in the first etching area.
Further, still include: a first coating layer and a second coating layer; the first coating layer and the second coating layer are wrapped outside the wrapping layer and are respectively arranged on two sides of the first etching area and the second etching area.
Further, the first coating layer and the first etching area are separated by a preset distance and wrapped outside the wrapping layer in the incidence direction; the second coating layer and the second etching area are separated by a preset distance and wrapped outside the wrapping layer in the emergent direction.
Further, still include: a quartz sleeve; the quartz sleeve is sleeved outside the first etching area and the second etching area in a suspending manner; the first end of the quartz sleeve is sleeved on the first coating layer, and the second end of the quartz sleeve is sleeved on the second coating layer.
Further, still include: a base and a cover plate; the quartz sleeve is arranged between the base and the cover plate, one side of the quartz sleeve is connected with the base, and the other side of the quartz sleeve is connected with the cover plate.
Furthermore, a first cooling water channel is arranged in the base, and a water inlet and a water outlet corresponding to the first cooling water channel are arranged at two ends of the base.
Furthermore, a second cooling water channel is arranged in the cover plate, and a water inlet and a water outlet corresponding to the second cooling water channel are arranged at two ends of the cover plate.
Further, the length of the first etching area is 4-6cm, and the etching interval in the first etching area is 0.1 cm; the length of the second etching area is 6-8cm, and the adjacent etching interval of the second etching area is 0.05 cm.
In order to solve the above problems, the present invention provides a processing method of a cladding light-stripping apparatus, comprising:
step 1: removing the coating layer in the middle section of the passive optical fiber to form a first coating layer and a second coating layer at two ends of the coating layer;
step 2: non-uniform etching is sequentially adopted on the surface of the exposed cladding to form a plurality of etching areas, the etching areas are sequentially connected along the laser transmission direction, and the grain density of each etching area is gradually increased along the laser transmission direction;
and step 3: and placing the etched passive optical fiber into the quartz sleeve, so that the quartz sleeve is suspended and sleeved outside the plurality of etching areas.
(III) advantageous effects
The invention provides a cladding light stripping device and a processing method thereof, which can enable laser with poor mode in a cladding and unabsorbed pump light to be transmitted out by etching lines on the surface of the cladding and damaging the smoothness of a surface structure. Meanwhile, the sparse lines are etched at the position where the cladding light is strong to reduce the stripping amount, and the dense lines are etched at the position where the cladding light is weak to increase the stripping amount. Therefore, the hidden trouble of overhigh local temperature of the device is solved, the temperature of the whole stripping device is reduced, the service life of a device is prolonged, the efficiency of stripping cladding light is increased, and the beam quality of a laser is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cladding light-stripping apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cladding light-stripping apparatus according to another embodiment of the present invention;
wherein, 1, cladding; 2. a first coating layer; 3. a second coating layer; 4. a quartz sleeve; 5. a base; 6. a cover plate; 11. a first etching area; 12. and a second etching region.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a cladding light-stripping apparatus, as shown in fig. 1, including: a passive optical fiber. Wherein, the middle section of the cladding 1 of the passive optical fiber is provided with a plurality of etched areas. The etching areas are sequentially connected along the laser transmission direction, and the grain density of each etching area is gradually increased along the laser transmission direction.
The etching of the cladding is to etch lines on the surface of the cladding by using physical and chemical methods to destroy the smoothness of the surface structure of the cladding, so that the cladding light cannot meet the total reflection condition.
In this embodiment, the etching region includes: a first etch region 11 and a second etch region 12. The first etching region 11 and the second etching region 12 are connected in sequence along the direction of laser transmission. The first etched region 11 is connected to the clad 1 in the incident direction, and the second etched region 12 is connected to the clad 1 in the exit direction. The second etching region 12 etches a texture density greater than that of the first etching region 11.
The transmitted light intensity depends on the density of the grains on the surface of the cladding. The cladding light at the front end of the cladding light stripping device is strong, so sparse grains are etched on the surface of the cladding at the front end to form a first etching area 11, the length of the sparse grain area corresponding to the first etching area 11 is 4-6cm, 10 scribed lines are arranged on the average of every 1cm, and the adjacent etching interval of the first etching area 11 is 0.1 cm. As the cladding light is transmitted in the stripping apparatus, the light intensity gradually decreases. In order to completely remove the cladding light, dense grains are etched on the surface of the cladding at the rear end of the device to form a second etching region 12, the length of the dense grain region corresponding to the second etching region 12 is 6-8cm, 20 scribed lines are arranged on the average per 1cm, and the adjacent etching interval of the second etching region 12 is 0.05 cm.
The total reflection condition can be destroyed by etching lines on the surface of the cladding. Non-uniform etching is adopted for etching the passive optical fiber grains, namely sparse grains are etched at the position with stronger cladding light, so that the stripping amount is reduced. And etching dense grains at the position where the cladding light is weak to increase the stripping amount. On the premise of not influencing the beam quality of the laser, the hidden trouble that the local temperature of the cladding light stripping device is overhigh is solved.
According to the cladding light stripping device provided by the embodiment of the invention, the flatness of the surface structure is damaged by etching lines on the surface of the cladding, so that laser with a poor mode in the cladding and unabsorbed pump light can be transmitted. Meanwhile, the sparse lines are etched at the position where the cladding light is strong to reduce the stripping amount, and the dense lines are etched at the position where the cladding light is weak to increase the stripping amount. Therefore, the hidden trouble of overhigh local temperature of the device is solved, the temperature of the whole stripping device is reduced, the service life of a device is prolonged, the efficiency of stripping cladding light is increased, and the beam quality of a laser is improved.
Based on the above embodiments, in a preferred embodiment, as shown in fig. 1 and 2, the cladding light-stripping apparatus further includes: a first coating layer 2 and a second coating layer 3. The first coating layer 2 and the second coating layer 3 are wrapped outside the cladding layer 1, and the first coating layer 2 and the second coating layer 3 are respectively arranged on two sides of the first etching area 11 and the second etching area 12.
Wherein, because the damage threshold of the coating layer is lower, the coating layer is required to be stripped orderly, and a certain distance is required to be kept with the etched grain region, and the distance is generally 0.5-1 cm. The first coating layer 2 is spaced from the first etching region 11 by a predetermined distance and wraps the cladding layer 1 in the incident direction. The second coating layer 3 and the second etching region 12 are separated by a preset distance and wrapped outside the cladding layer 1 in the emergent direction. In addition, the preset distance between the coating layer and the etching layer can be adjusted according to actual conditions.
To protect the etched lines of the cladding, dust is prevented from contaminating the etched regions, i.e. the first etched region 11 and the second etched region 12. A quartz sleeve 4 can also be added. The quartz sleeve 4 is sleeved outside the first etching area 11 and the second etching area 12 in a suspending way. The first end of the quartz sleeve 4 is sleeved on the first coating layer 2, and the second end of the quartz sleeve 4 is sleeved on the second coating layer 3. The quartz sleeve 4 has good light transmittance and high damage threshold, increases the working stability of the stripping device and has a length of about 16 cm. And fixing the joint of the quartz sleeve and the coating layer by using high-temperature-resistant glue, so that the etched passive optical fiber is suspended in the middle of the quartz sleeve.
In another embodiment, as shown in fig. 2, the cladding light-stripping apparatus further includes: a base 5 and a cover 6. The quartz sleeve 4 is arranged between the base 5 and the cover plate. One side of the quartz sleeve 4 is connected to a base 5. The other side of the quartz sleeve 4 is connected to the cover plate 6 or is arranged adjacent to the cover plate 6.
Wherein, the base 5 and the cover plate 6 can be made of red copper with better heat dissipation. The red copper is a good heat dissipation material, and most of the cladding light penetrating through the quartz sleeve 4 is absorbed and converted into heat by the base 5 and the cover plate 6. In addition, in order to prevent the base 5 and the cover plate 6 from being excessively high in temperature, a first cooling water channel may be provided in the base 5, and both ends of the base 5 are provided with a water inlet and a water outlet corresponding to the first cooling water channel. A second cooling water channel may be provided in the cover plate 6, and both ends of the cover plate 6 are provided with a water inlet and a water outlet corresponding to the second cooling water channel. The temperature of the base 5 and the cover plate 6 can be effectively reduced by using the first cooling water channel and the second cooling water channel.
An embodiment of the present invention provides a processing method of a cladding light-stripping device, as shown in fig. 1 and 2, the processing method includes:
step 1: the coating layer is removed from the middle section of the passive fiber to form a first coating layer and a second coating layer at both ends of the coating layer.
Step 2: non-uniform etching is sequentially adopted on the surface of the exposed cladding to form a plurality of etching areas, the etching areas are sequentially connected along the laser transmission direction, and the grain density of each etching area is gradually increased along the laser transmission direction.
And step 3: and placing the etched passive optical fiber into the quartz sleeve, so that the quartz sleeve is suspended and sleeved outside the plurality of etching areas.
In order to further reduce the temperature of the whole stripping device, the quartz sleeve 4 can be fixed between the base 5 provided with the first cooling water channel and the cover plate 6 provided with the second cooling water channel after the step 3, so that the temperature of the base 5 and the temperature of the cover plate 6 can be effectively reduced through the first cooling water channel and the second cooling water channel.
Wherein the etch layer comprises: a first etch region 11 and a second etch region 12. The first etching region 11 and the second etching region 12 are connected in sequence along the direction of laser transmission. The first etched region 11 is connected to the clad 1 in the incident direction, and the second etched region 12 is connected to the clad 1 in the exit direction. The second etching region 12 etches a texture density greater than that of the first etching region 11. The first coating layer 2 and the second coating layer 3 are wrapped outside the cladding layer 1, and the first coating layer 2 and the second coating layer 3 are respectively arranged on two sides of the first etching area 11 and the second etching area 12.
Specifically, a process for manufacturing a clad light-stripping device. A section of coating layer is removed from the middle of a section of passive optical fiber, the length of the removed coating layer is about 15cm, the stripping opening of the coating layer is neat, and a first coating layer 2 and a second coating layer 3 are formed. Lines are etched on the surface of the passive optical fiber exposed cladding 1, the smoothness of the surface structure of the cladding is damaged, and cladding light such as laser light, pump light and the like which enter the cladding with poor mode and do not meet the total reflection condition is transmitted out. The intensity of the transmitted light depends on the density of the surface texture of the cladding 1. The cladding light at the front end of the device is strong, so sparse lines are etched on the surface of the cladding 1 at the front end to form a first etching area 11, the length of the sparse line area is 6cm, and 10 scribed lines are arranged on the average per 1 cm. As the cladding light is transmitted in the stripping apparatus, the light intensity gradually decreases. In order to completely remove the cladding light, dense grains are etched on the surface of the cladding at the rear end of the device to form a second etching region 12, the length of the dense grain region is 8cm, and 20 scribed lines are arranged on the average of every 1 cm. Because the damage threshold of the coating layer is low, the coating layer is required to be stripped neatly, and the distance of 0.5cm from the etched grain region is also required to be kept. The etched passive fiber is placed into a quartz sleeve 4 for protecting the cladding from etching lines, and the length of the quartz sleeve 4 is about 16 cm. The quartz sleeve 4, the first coating layer 2 and the second coating layer 3 are fixed by high-temperature-resistant glue, so that the etched first etching area 11 and the etched second etching area 12 are suspended in the middle of the quartz sleeve 4. The quartz sleeve 4 is then fixed between the base 5 provided with the first cooling channel and the cover plate 6 provided with the second cooling channel.
In summary, the processing method provided by the embodiment of the invention destroys the flatness of the surface structure by etching the texture on the surface of the cladding, so that the laser with poor mode in the cladding and the unabsorbed pump light can be transmitted. Meanwhile, the sparse lines are etched at the position where the cladding light is strong to reduce the stripping amount, and the dense lines are etched at the position where the cladding light is weak to increase the stripping amount. Therefore, the hidden trouble of overhigh local temperature of the device is solved, the temperature of the whole stripping device is reduced, the service life of a device is prolonged, the efficiency of stripping cladding light is increased, and the beam quality of a laser is improved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cladding light-stripping apparatus, comprising:
a passive optical fiber;
the middle section of the cladding of the passive optical fiber is provided with a plurality of etching areas; the etching regions are sequentially connected along the laser transmission direction, and the grain density of the etching regions gradually increases along the laser transmission direction.
2. The cladding light-stripping apparatus of claim 1, wherein the plurality of etched regions comprises:
a first etching region and a second etching region; the first etching area and the second etching area are sequentially connected along the laser transmission direction; the first etching area etches the cladding in the incident direction, and the second etching area etches the cladding in the emergent direction; the texture density etched in the second etching area is larger than that etched in the first etching area.
3. The cladding light-stripping apparatus of claim 2, further comprising:
a first coating layer and a second coating layer; the first coating layer and the second coating layer are wrapped outside the wrapping layer and are respectively arranged on two sides of the first etching area and the second etching area.
4. The cladding light-stripping apparatus as claimed in claim 3, wherein said first coating layer is spaced from said first etching region by a predetermined distance, and is wrapped outside said cladding layer in the incident direction; the second coating layer and the second etching area are separated by a preset distance and wrapped outside the wrapping layer in the emergent direction.
5. The cladding light-stripping apparatus of claim 4, further comprising:
a quartz sleeve; the quartz sleeve is sleeved outside the first etching area and the second etching area in a suspending manner; the first end of the quartz sleeve is sleeved on the first coating layer, and the second end of the quartz sleeve is sleeved on the second coating layer.
6. The cladding light-stripping apparatus of claim 5, further comprising:
a base and a cover plate; the quartz sleeve is arranged between the base and the cover plate, one side of the quartz sleeve is connected with the base, and the other side of the quartz sleeve is connected with the cover plate.
7. The cladding light-stripping apparatus as claimed in claim 6, wherein said base has a first cooling water channel therein, and said base has a water inlet and a water outlet at opposite ends thereof corresponding to said first cooling water channel.
8. The cladding light-stripping apparatus as claimed in claim 6, wherein said cover plate has a second cooling water channel therein, and both ends of said cover plate have a water inlet and a water outlet corresponding to said second cooling water channel.
9. The cladding light-stripping apparatus as claimed in claim 2, wherein said first etching region has a length of 4-6cm, and the etching interval in said first etching region is 0.1 cm; the length of the second etching area is 6-8cm, and the adjacent etching interval of the second etching area is 0.05 cm.
10. A processing method of a cladding light-stripping device is characterized by comprising the following steps:
step 1: removing the coating layer in the middle section of the passive optical fiber to form a first coating layer and a second coating layer at two ends of the coating layer;
step 2: non-uniform etching is sequentially adopted on the surface of the exposed cladding to form a plurality of etching areas, the etching areas are sequentially connected along the laser transmission direction, and the grain density of each etching area is gradually increased along the laser transmission direction;
and step 3: and placing the etched passive optical fiber into the quartz sleeve, so that the quartz sleeve is suspended and sleeved outside the plurality of etching areas.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023206912A1 (en) * | 2022-04-24 | 2023-11-02 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber stripper, manufacturing method for optical fiber stripper, and laser device |
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| CN109541750A (en) * | 2018-12-29 | 2019-03-29 | 昆山华辰光电科技有限公司 | The production method and encapsulating structure of optical fiber mode stripper |
| CN109768459A (en) * | 2019-02-14 | 2019-05-17 | 深圳市鹏星光电科技有限公司 | A kind of pump light stripper of laser ablation and preparation method thereof |
| CN110361809A (en) * | 2019-07-05 | 2019-10-22 | 深圳联品激光技术有限公司 | Optical fiber, fibre cladding power stripper, optical fiber laser and method for preparing optical fiber |
Cited By (1)
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| WO2023206912A1 (en) * | 2022-04-24 | 2023-11-02 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber stripper, manufacturing method for optical fiber stripper, and laser device |
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