High-power laser cladding light filter

Abstract

The utility model discloses a high-power laser cladding light filter, comprising an optical fiber unit which comprises a fiber core used for transmitting laser and a cladding member arranged outside the fiber core and used for wrapping the fiber core, and the outer side of the cladding member is provided with a cladding light stripping area; the light filtering unit comprises a glass tube used for filtering cladding light and supporting the cladding part, and curing glue used for fastening the cladding part is arranged between the glass tube and the cladding part; and a light filtering part for filtering reflected light is arranged in the glass tube. According to the utility model, the light filtering part is arranged in the glass tube, so that cladding light is prevented from being reflected back and forth in the glass tube and transmitted to the joint of the optical fiber unit and the glass tube, and damage caused by over-high temperature of curing glue is avoided.

Description

Technical Field

[0001] This utility model relates to the field of cladding optical filter technology, specifically a high-power laser cladding optical filter. Background Technology

[0002] In the fiber amplifier of a high-power fiber laser, pump light is coupled into the inner cladding of the fiber to amplify the signal light in the fiber core. However, during optical transmission, some residual pump light and stray light generated by various nonlinear effects leak into the cladding of the fiber. If this cladding light is not effectively removed, it will cause the fiber temperature to rise, leading to thermal effect-related problems such as changes in fiber refractive index, mode instability, and even device damage, which seriously affect the performance and reliability of the fiber laser.

[0003] Under high-power operation, the cladding stripper faces severe challenges. On the one hand, a large amount of cladding light will generate significant heat after being stripped. If heat cannot be dissipated in a timely and effective manner, the internal temperature of the stripper will rise sharply, affecting its optical performance and even causing device damage. On the other hand, the irradiation of high-power lasers and various stress factors in the working environment place higher demands on the stability and reliability of the optical components and connection structures inside the stripper.

[0004] Traditional encapsulation structures typically employ a glass tube in the stripping area outside the optical fiber to refract and disperse the emitted laser light. However, in existing technologies, the inner wall of the glass tube extends horizontally to the direction of the optical fiber. Inside the glass tube, in addition to the refracted portion of the cladding light, another portion is reflected back and forth, causing the temperature in the area between the glass tube and the optical fiber to rise. This leads to overheating at the connection point between the optical fiber and the glass tube, which can cause the curing adhesive in the encapsulation area to melt due to excessive temperature, ultimately damaging the encapsulation structure.

[0005] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Utility Model Content

[0006] The purpose of this invention is to provide a high-power laser cladding light filter to solve the problem mentioned in the background art, where the inner wall extension direction of the glass tube is horizontal with the extension direction of the optical fiber. In addition to the refracted part of the cladding light, another part of the light is reflected back and forth inside the glass tube, causing the temperature in the area between the glass tube and the optical fiber to rise. This leads to the fixed area heating up at the connection between the optical fiber and the glass tube, which can easily cause the curing adhesive in the encapsulation area to melt due to excessive temperature, thereby damaging the encapsulation structure.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A high-power laser cladding optical filter includes:

[0009] An optical fiber unit includes a fiber core for transmitting laser light, a cladding member disposed outside the fiber core for wrapping the fiber core, and a cladding light stripping region provided on the outer side of the cladding member;

[0010] The filtering unit includes a glass tube for filtering out cladding light and supporting the cladding component, and a curing adhesive for fastening the cladding component is provided between the glass tube and the cladding component.

[0011] The glass tube is equipped with a filter section inside for filtering out reflected light.

[0012] Furthermore, a coating layer is provided on the outer side of the cladding component, and the coating layer is offset from the cladding light stripping area to block the cladding light inside the cladding component.

[0013] Furthermore, the filter section is a glass tube with a roughened wall, used to scatter light emitted from the cladding light stripping region.

[0014] Furthermore, the filter section is a glass tube with a diameter that gradually decreases along the laser transmission direction of the fiber core, used to prevent the cladding light from reflecting back and forth inside the glass tube wall.

[0015] Furthermore, the filter section is a circular tube at the cured fiber end of the glass tube away from the laser transmission end, and a tapered section at the cured fiber end near the laser transmission end, to prevent the cladding light from reflecting back and forth inside the tube wall of the glass tube.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model prevents the cladding light from being reflected back and forth inside the glass tube by setting a filter part, which would cause the curing adhesive to overheat and be damaged at the connection between the optical fiber unit and the glass tube. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the inclined glass tube of this utility model;

[0020] Figure 3 This diagram shows the fit between the glass tube and the inclined part of this utility model.

[0021] Reference numerals: 1. Filter unit; 11. Glass tube; 111. Tube wall; 112. Tapered part; 12. Curing adhesive; 2. Fiber unit; 21. Coating layer; 22. Cladding component; 221. Cladding light stripping area; 23. Fiber core. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides a technical solution:

[0024] A high-power laser cladding optical filter includes:

[0025] The fiber unit 2 includes a fiber core 23 for transmitting laser light, and a cladding member 22 disposed outside the fiber core 23 for wrapping the fiber core 23. The cladding member 22 has a cladding light stripping region 221 on its outer side.

[0026] The filter unit 1 includes a glass tube 11 for filtering out cladding light and supporting the cladding member 22, and a curing adhesive 12 for fastening the cladding member 22 is provided between the glass tube 11 and the cladding member 22.

[0027] The glass tube 11 is provided with a filter section inside for filtering out reflected light.

[0028] It should be noted that when the fiber core 23 is transmitting high-power laser, if the laser diverges locally in the cladding light stripping area 221, a filter is provided inside the glass tube 11 to prevent the cladding light from reflecting back and forth inside the glass tube 11. This would cause the light to be transmitted to the connection between the fiber unit 2 and the glass tube 11, resulting in the curing adhesive 12 being damaged due to excessively high temperature.

[0029] As an improvement, such as Figure 1 As shown, the outer side of the cladding member 22 is provided with a coating layer 21, which is offset from the cladding light stripping area 221 to block the cladding light inside the cladding member 22.

[0030] It should be added that, when manufacturing the device, the outermost coating layer 21 needs to be removed, a cladding light stripping area 221 needs to be made on the cladding component 22, and then a curing adhesive 12 needs to be applied to the remaining optical fiber with the coating layer 21 to bond the optical fiber device to the glass tube 11.

[0031] Furthermore, such as Figure 1 As shown, the filter section is a glass tube 11 with a roughened tube wall 111, used to scatter the light emitted from the cladding light stripping region 221.

[0032] It should be noted that by making the wall 111 of the glass tube 11 rough, the light is ensured to be converted from total internal reflection to diffuse reflection when it hits the inner wall of the glass tube 11, which further reduces the temperature generated after the light is reflected and ensures that the packaging mechanism will not be damaged due to overheating.

[0033] As an improvement, such as Figure 2 As shown, the diameter of the glass tube 11 of the filter section gradually decreases along the laser transmission direction of the fiber core 23, and the tube wall 111 is used to prevent the cladding light from being reflected back and forth inside the tube wall 111 of the glass tube 11.

[0034] As an improvement, such as Figure 3 As shown, the filter part is a circular tube at the end of the glass tube 11 away from the laser transmission end where the cured adhesive 12 is far from the laser transmission end, and a tapered part 112 at the end of the cured adhesive 12 near the laser transmission end, which is used to prevent the cladding light from reflecting back and forth inside the tube wall 111 of the glass tube 11.

[0035] It should be noted that by making the portion of the glass tube 11 away from the laser transmission end of the curing adhesive 12 a circular tube, and the portion of the curing adhesive 12 near the laser transmission end a tapered portion 112, even if the laser is reflected multiple times inside the glass tube 11 to the tapered portion 112, the tapered portion 112 can still change the reflection trajectory of the reflected light, preventing the reflected light from directly irradiating the curing adhesive 12 and causing the curing adhesive 12 to melt due to heat.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-power laser cladding optical filter, characterized in that, include: The fiber unit (2) includes a fiber core (23) for transmitting laser light, and a cladding member (22) disposed outside the fiber core (23) for wrapping the fiber core (23). The cladding member (22) has a cladding light stripping region (221) on its outer side. The filter unit (1) includes a glass tube (11) for filtering out cladding light and supporting the cladding member (22), and a curing adhesive (12) for fastening the cladding member (22) is provided between the glass tube (11) and the cladding member (22). The glass tube (11) is provided with a filter section inside for filtering out reflected light.

2. The high-power laser cladding optical filter according to claim 1, characterized in that: The outer side of the cladding member (22) is provided with a coating layer (21), which is offset from the cladding light stripping area (221) to block the cladding light inside the cladding member (22).

3. A high-power laser cladding optical filter according to claim 1, characterized in that: The filter section is a glass tube (11) with a roughened tube wall (111) used to scatter light emitted from the cladding light stripping region (221).

4. A high-power laser cladding optical filter according to claim 1, characterized in that: The filter section is a glass tube (111) whose diameter gradually decreases along the laser transmission direction of the fiber core (23), used to prevent the cladding light from being reflected back and forth inside the glass tube (111).

5. A high-power laser cladding optical filter according to claim 1, characterized in that: The filter section is a circular tube at the end of the glass tube (11) away from the laser transmission end of the cured adhesive (12) fiber, and a tapered section (112) near the end of the laser transmission end of the cured adhesive (12) fiber, which is used to prevent the cladding light from reflecting back and forth inside the tube wall (111) of the glass tube (11).

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