Optical fiber output head of high-power laser

Abstract

The utility model relates to an optical fiber output head of a high-power laser, which sequentially comprises a dodging rod, a first lens, a plurality of second lenses arranged on a lens fixing seat and a plurality of insertion cores axially corresponding to the second lenses respectively from the front end to the rear end, an optical fiber is inserted in each insertion core, the positions of the first lens and the plurality of second lenses are set as follows: the combined focus of the second lenses and the first lens and the focus of the first lens are both on the rear end surface of the light homogenizing rod, and the first lens focuses light from the plurality of second lenses to the rear end of the light homogenizing rod. According to the utility model, the large lens and the uniformly distributed small lenses are matched for use, so that small-size light spots can be obtained; meanwhile, glue is not used in the insertion core, so that the temperature of the output head is obviously reduced, the temperature rise caused by the glue contained in the output head is avoided, and the problem that the insertion core head is cracked due to more heat generated by high-power laser is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of laser, especially, relate to a high power laser fiber output head. BACKGROUND

[0002] The laser fiber output head is generally a output head that bundles multiple optical fibers, specifically, multiple optical fibers, for example, dozens of optical fibers, are put into the same ferrule hole, and then glued to fix the optical fibers, although this can obtain a small spot size, but since multiple optical fibers are put into the same ferrule hole, the amount of glue in the ferrule hole is relatively large, the glue can absorb light to generate heat and thus increase the temperature, and when high-power laser is output, more heat will be generated, and the output head has the risk of being too hot, which can easily cause the output head to explode. The prior art also divides the optical fibers into multiple strands for output, but this results in a larger spot size, because the entire spot is dispersed, so a high-power laser fiber output head that avoids overheating of the output head and has good focusing effect is needed. SUMMARY

[0003] The utility model provides a kind of high power laser fiber output head, to solve the problem that temperature is too high when obtaining small spot in prior art and has good focusing effect.

[0004] The technical scheme of the utility model is as follows:

[0005] The high-power laser fiber output head of the utility model comprises, in sequence from the front end to the rear end in the axial direction: a homogenizing rod, a first lens, a plurality of second lenses disposed on a lens fixing seat, and a plurality of ferrules corresponding to the plurality of second lenses in the axial direction. Each ferrule has an optical fiber inserted therein. The positions of the first lens and the plurality of second lenses are set such that the combined focal point of the second lenses and the first lens and the focal point of the first lens are both on the rear end surface of the homogenizing rod. The first lens focuses the light from the plurality of second lenses to the rear end of the homogenizing rod.

[0006] Optionally, in the above-mentioned high-power laser fiber output head, the high-power laser fiber output head comprises seven second lenses disposed on the lens fixing seat and seven ferrules corresponding to the seven second lenses.

[0007] Optionally, in the above-mentioned high-power laser fiber output head, the lens fixing seat has a circular cross-section, and one second lens is fixed at the center of the circular cross-section of the lens fixing seat, and six second lenses are arranged around the periphery of the second lens at the center.

[0008] Optionally, in the above-mentioned high-power laser fiber output head, the high-power laser fiber output head further comprises a fiber clamp seat for fixing the plurality of ferrules, and the plurality of ferrules are inserted into the fiber clamp seat.

[0009] Optionally, in the high-power laser fiber output head, a limiting block is arranged between the front end of the fiber holder and the rear end of the second lens, and a plurality of through holes for the plurality of ferrules to pass through are arranged on the limiting block.

[0010] Optionally, in the high-power laser fiber output head, a first sleeve and a second sleeve are fixedly connected together, the light homogenizing rod, the first lens and the lens fixing seat on which the plurality of second lenses are fixed are arranged in a cavity of the first sleeve, and the limiting block and the fiber holder are arranged in an inner cavity of the second sleeve.

[0011] Optionally, in the high-power laser fiber output head, the first lens comprises one of a spherical lens and an aspherical lens having a focusing function.

[0012] Optionally, in the high-power laser fiber output head, the second lens comprises one of a spherical lens and an aspherical lens having a focusing function.

[0013] According to the technical scheme of the utility model, the beneficial effects are:

[0014] The utility model discloses a large lens and a plurality of uniformly arranged small lenses are used in cooperation, and a small size light spot can be obtained, the utility model discloses do not use the glue in the ferrule, and the temperature of output head is obviously reduced, the problem that the ferrule head explodes due to the high-power laser generating more heat is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0016] Figure 1 It is the structure plane schematic view of the high-power laser fiber output head of the utility model;

[0017] Figure 2 It is the structure perspective view of the high-power laser fiber output head of the utility model.

[0018] Figure 3 It is the structure perspective view of the internal main device of the high-power laser fiber output head of the utility model; Figure 1 It is the sectional view along the plane A-A of the high-power laser fiber output head;

[0019] Figure 4 It is the structure perspective view of the internal main device of the high-power laser fiber output head of the utility model;

[0020] Figure 5 is the structure diagram of the internal main device behind the hidden lens fixing base of the high-power laser fiber output head and the partial enlarged view of B area of the utility model;

[0021] Figure 6 is the structure diagram of the lens fixing base of the high-power laser fiber output head of the utility model;

[0022] Figure 7 is the structure diagram of the limiting block of the high-power laser fiber output head of the utility model;

[0023] Figure 8 is the light propagation direction schematic view of the high-power laser fiber output head of the utility model.

[0024] Reference signs:

[0025] 1-first sleeve;11-first cavity;2-uniform light rod;3-first lens;4-second lens;41-lens fixing base;411-lens fixing hole;5-limiting block;51-through hole;6-insert core;7-fiber clamp base;8-second sleeve;81-first section;82-second section;83-third section;9-fiber; DETAILED DESCRIPTION

[0026] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The following exemplary embodiments described in the exemplary embodiments are not meant to represent all embodiments in accordance with the present application. Rather, they are merely examples in accordance with a portion of the present application as detailed in the appended claims.

[0027] The description of illustrative embodiments according to the principles of the present application is given in connection with the appended drawings. The description is made in connection with the drawings, which are to be considered part of this written description. In the description of embodiments of the application disclosed herein, any reference to direction or orientation is merely intended for convenience of description and is not intended in any way to limit the scope of the present application. Relative terms such as "downward", "upward", "horizontal", "vertical", "above", "below", "upper", "lower", "top", "bottom", and derivatives thereof (e.g., "horizontally", "downwardly", "upwardly", etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description only and do not require that the apparatus be constructed or operated in any particular orientation unless explicitly indicated otherwise.

[0028] Terms such as "attached", "added", "connected", "coupled", "interconnected" and the like mean a relationship in which structures are fixed or attached to each other directly or indirectly through intermediate structures, and are movable or rigidly attached or related unless otherwise explicitly stated. In addition, the features and benefits of the present application are illustrated by referring to exemplary embodiments. Therefore, the present application should not be limited to such exemplary embodiments, which illustrate some possible non-limiting combinations of features that can exist alone or in other combinations; the scope of the present application is defined by the appended claims.

[0029] As shown in Figures 1 to 3 The high-power laser fiber output head of the present application sequentially includes a light uniformizing rod 2, a first lens 3, a plurality of second lenses 4 arranged on a lens fixing seat 41, a plurality of ferrules 6 corresponding to the plurality of second lenses 4 in the axial direction, and an optical fiber 9 inserted into each ferrule 6, from the front end to the rear end in the axial direction. The light direction in the optical fiber 9 is from the rear end to the front end. Among them, the positions of the first lens 3 and the plurality of second lenses 4 are arranged such that the combined focal point of the second lens 5 and the first lens 3 and the focal point of the first lens 3 are both on the rear end surface of the light uniformizing rod 2, and the first lens 3 focuses the multiple light beams from the plurality of second lenses 4 to the rear end of the light uniformizing rod 2 to ensure that the spot size of the laser incident to the end surface of the light uniformizing rod is minimized. Due to the focusing function of the larger first lens 3 and the smaller second lenses 4 uniformly distributed, the light can be focused into a smaller spot at the rear end of the light uniformizing rod 2, and then the light is uniformly emitted from the front end of the light uniformizing rod 2 through the reflection in the light uniformizing rod 2.

[0030] Preferably, the high-power laser fiber output head of the present application sequentially includes a light uniformizing rod 2, a first lens 3, seven second lenses 4 arranged on a lens fixing seat 41, a limiting block 5, and seven ferrules 6 corresponding to the seven second lenses 4, wherein one optical fiber 9 is inserted into each ferrule 6.

[0031] The lens fixing seat 41 has a circular cross-section, and the seven second lenses 4 are tightly and uniformly distributed around the center point of the circular cross-section. As shown in Figure 6 The seven second lenses 4 are arranged in the lens hole 411 of the lens fixing seat 41, that is, one second lens 4 is fixed at the center of the lens fixing seat 41 with a circular cross-section, and the other six second lenses 4 are arranged around the periphery of the second lens 4 at the center.

[0032] As shown in Figure 4 and Figure 5 The high-power laser fiber output head of the present application further includes a fiber clamping seat 7, and the seven ferrules 6 are inserted into the fiber clamping seat 7, and the fiber clamping seat 7 is used to fix the fiber ferrule 6, preferably, the optical fiber is fixed in a manner of point gluing.

[0033] The limiting block 5 is located between the front end of the fiber holder 7 and the rear end of the second lens 4, and the limiting block 5 is provided with seven through holes 51 (as shown) for the seven ferrules 6 to pass through. Figure 7 The limiting block 5 is used to adjust the distance between the end face of the optical fiber 9 and the second lens 4. The distance between the end face of the optical fiber 9 and the second lens 4 can be adjusted by replacing the limiting block 5 with different thickness specifications, the object distance of the lens system is changed to change the image distance, thereby achieving a better focusing effect.

[0034] As shown in Figure 1 According to the preferred embodiment, the high-power laser fiber output head of the utility model further comprises a first sleeve 1 and a second sleeve 8 fixedly connected together, the first sleeve 1 and the second sleeve 8 are both provided with cavities inside, the light homogenizing rod 2, the first lens 3 and the lens fixing seat 41 fixed with the seven second lenses 4 are all installed in the cavity of the first sleeve 1. The position of the first lens 3 in the first cavity 11 of the first sleeve 1 is adjustable, which can make the first lens 3 focus the multiple beams from the seven second lenses 4 to form a smaller light spot to be coupled into the rear end of the light homogenizing rod 2.

[0035] Preferably, the second sleeve 8 comprises a first section 81, a second section 82 and a third section 83 from the front end to the rear end in the axial direction, wherein the outer diameters of the first section 81, the second section 82 and the third section 83 gradually decrease and are all smaller than the outer diameter of the first sleeve 1. The limiting block 5 and the fiber holder 7 with the seven ferrules 6 inserted are fixed in the inner cavity of the second sleeve 8 by screwing or gluing, preferably in the inner cavity of the first section 81 of the second sleeve 8.

[0036] The first lens 3 and the second lens 4 comprise one of a spherical lens and an aspherical lens with focusing function, preferably the first lens 3 and the second lens 4 are aspherical lenses. The convex surface of the first lens 3 can face either the front end or the rear end, which functions to reduce spherical aberration.

[0037] The light propagation path in the high-power laser fiber output head of the utility model is as shown in Figure 8As shown, the light of each optical fiber 9 first passes through a plurality of uniformly distributed second lenses 4 (small focusing lenses), the plurality of second lenses 4 respectively focus the light output by the optical fiber in each ferrule 6, and the plurality of light beams passing through the plurality of second lenses 4 are focused by the front-end first lens 3 (large focusing lens) to simultaneously focus the plurality of light beams, so that the entire light spot size formed is very small; then the light enters the rear end of the light homogenizing rod 2 to make the light spot uniform. The light homogenizing rod is a common optical instrument that can convert uneven light into uniform light through multiple reflections in the light homogenizing rod, and output the light from the front end of the light homogenizing rod; the light homogenizing rod is usually composed of a long and thin rod-shaped lens, and the lens is internally provided with special optical material, which can cause the light to be reflected multiple times inside the lens, thereby realizing uniform distribution of the light. According to requirements, square or circular light spots can be obtained by adjusting the shape of the light homogenizing rod.

[0038] The utility model discloses a plurality of ferrules, including 1 optical fiber in each ferrule, and a plurality of ferrules are inserted into the same optical fiber holder, a small focusing lens is arranged in front of the optical fiber of each ferrule for focusing, a large focusing lens is used to simultaneously focus the multiple focused light from the plurality of ferrules to a point, and then the light enters the light homogenizing rod. The small focusing lens and the large focusing lens jointly play a focusing role, the focal length of the small focusing lens is relatively large, and the focal length of the large focusing lens is relatively small, so that the focal point of each light beam of a single ferrule and the focal point of the multiple light beams of a plurality of ferrules are jointly focused on the same point, so that the light spot size at the focal point can be controlled to be relatively small, and the light homogenizing rod is convenient to enter. If a large focusing lens is directly used without using a small focusing lens, the light spot focusing effect is poor, and if only a plurality of small focusing lenses are used, each single light on the focusing surface of the plurality of light beams is divergent, the light spot size is large, and the effect of the light homogenizing rod is poor. Therefore, the utility model discloses that the large lens and the small lens are used in cooperation, and a small-size light spot can be obtained, and the utility model discloses that no glue is used in the ferrule, the temperature of the output head is obviously reduced, the temperature rise caused by the glue in the output head is avoided, and the problem that the ferrule head is cracked due to more heat generated by high-power laser is avoided.

[0039] The above-described embodiments are merely specific embodiments of the present application, and are used to explain the technical scheme of the present application, rather than limit the same. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any person skilled in the art can modify or easily think of changes to the technical scheme recorded in the foregoing embodiments, or equivalently replace some of the technical features within the technical range disclosed by the present application. The modifications, changes or replacements do not cause the corresponding technical scheme to deviate from the spirit and scope of the technical scheme of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high power laser fiber output head characterized by, The high-power laser fiber output head comprises a first lens, a plurality of second lenses arranged on the lens fixing seat, and a plurality of ferrules corresponding to the plurality of second lenses in the axial direction, wherein an optical fiber is inserted into each ferrule, and the positions of the first lens and the plurality of second lenses are arranged such that the combined focal point of the second lens and the first lens and the focal point of the first lens are both on the rear end surface of the homogenizing rod, and the first lens focuses light from the plurality of second lenses to the rear end of the homogenizing rod.

2. The high power laser fiber delivery head of claim 1, wherein, The high-power laser fiber output head comprises 7 second lenses arranged on the lens fixing seat and 7 ferrules corresponding to the 7 second lenses.

3. The high power laser fiber delivery head of claim 2, wherein, The lens fixing seat has a circular cross-section, wherein one second lens is fixed at the center of the circular cross-section of the lens fixing seat, and six second lenses are arranged around the periphery of the second lens at the center.

4. The high power laser fiber delivery head of claim 1, wherein, The high-power laser fiber output head further comprises a fiber clamp seat for fixing the plurality of ferrules, and the plurality of ferrules are inserted into the fiber clamp seat.

5. The high power laser fiber delivery head of claim 4, wherein, A limiting block is further arranged between the front end of the fiber clamp seat and the rear end of the second lens, and the limiting block is provided with a plurality of through holes for the plurality of ferrules to pass through.

6. The high power laser fiber delivery head of claim 5, wherein, A first sleeve and a second sleeve are further fixedly connected together, the homogenizing rod, the first lens, and the lens fixing seat with the plurality of second lenses fixed thereon are arranged in the cavity of the first sleeve, and the limiting block and the fiber clamp seat are arranged in the inner cavity of the second sleeve.

7. The high power laser fiber delivery head of claim 1 wherein, The first lens comprises one of a spherical lens and an aspherical lens with focusing function.

8. The high power laser fiber output head of claim 1, wherein, The second lens comprises one of a spherical lens and an aspherical lens with focusing function.

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