Laser zooming homogenizing heating system and using method thereof

Abstract

The invention provides a laser zoom homogenizing heating system and a using method thereof.The laser zoom homogenizing heating system comprises a laser output head assembly, a zoom lens set and a zoom mechanical structure, the zoom lens set comprises a first lens set, a second lens set and a third lens set, the first lens set is fixed relative to the position of the laser output head assembly, and the second lens set is fixed relative to the position of the third lens set; emitted laser sequentially passes through the first lens group, the second lens group and the third lens group, the second lens group and the third lens group are respectively connected with the zooming mechanical structure, and the zooming mechanical structure is used for zooming the positions of the second lens group and the third lens group. A mechanical compensation type zooming system is adopted, the light emitting position of the semiconductor laser optical fiber coupling output tail fiber and the zooming system meet the imaging relation all the time, zooming homogenization of high-power optical fiber coupling output laser can be achieved by changing the positions of the second lens set and the third lens set, the light spot height is uniform on the heating acting face, and the focusing effect is good. And the spot size is continuously adjustable.

Description

Technical Field

[0001] The present invention relates to the technical field of laser heating, and in particular to a laser zoom homogenization heating system and a use method thereof. Background Art

[0002] Existing laser zoom devices are often used for lighting, and the laser light source power is low and cannot bear high-power applications. In addition, the light spot uniformity of ordinary laser zoom systems is low during the zoom process, often showing a bright center and dark surrounding effect. Therefore, there is an urgent need for a variable focus homogenization system that can be used for high-power laser heating to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a laser zoom homogenization heating system and a method of using the system, which is applied to high-power fiber-coupled output lasers, has continuously adjustable spot size, clear spot edges, high uniformity, and can achieve the purpose of irradiation uniform heating at a fixed working distance.

[0004] According to one object of the present invention, the present invention provides a laser zoom homogenization heating system, comprising a laser output head assembly, a zoom lens group and a zoom mechanical structure, wherein the zoom lens group comprises a first lens group, a second lens group and a third lens group, wherein the position of the first lens group relative to the laser output head assembly is fixed, and the laser emitted by the laser output head assembly passes through the first lens group, the second lens group and the third lens group in sequence, and the second lens group and the third lens group are respectively connected to the zoom mechanical structure, and the zoom mechanical structure zooms the positions of the second lens group and the third lens group.

[0005] Further, the zoom mechanical structure includes a guide groove inner cylinder, in which a second lens group barrel and a third lens group barrel are slidably arranged, the second lens group is fixed in the second lens group barrel, and the third lens group is fixed in the third lens group barrel, and a guide groove outer cylinder is sleeved on the outer side of the guide groove inner cylinder, and the second lens group barrel and the third lens group barrel are respectively connected to the guide groove inner cylinder and the guide groove outer cylinder through positioning slider screws.

[0006] Furthermore, the laser output head assembly includes a laser light source, and the laser light source is a fiber-coupled output semiconductor laser light source.

[0007] Furthermore, the NA of the output pigtail of the fiber-coupled output semiconductor laser light source is 0.22.

[0008] Furthermore, the laser output head assembly includes a QBH laser output head and a square fiber holder for square optical fiber, the QBH laser output head is fixed to the square optical fiber holder by screws, the square optical fiber holder is threadedly connected to the square optical fiber connection holder, and the square optical fiber connection holder is fixed to the first lens group barrel of the square optical fiber by a square optical fiber fixing ring and fixing screws.

[0009] Furthermore, the laser output head assembly includes an SMA905 fiber optic connector and a round fiber seat for round optical fibers, the SMA905 fiber optic connector is fixed to the round optical fiber seat by threads, the round optical fiber seat is connected to the round optical fiber connection seat by threads, and the round optical fiber connection seat is fixed to the first lens group barrel of the round optical fiber by a round optical fiber fixing ring and screws.

[0010] Furthermore, the first lens group includes three plano-convex lenses, namely, a first lens, a second lens and a third lens, in sequence along the laser propagation direction, with positive optical power; the second lens group includes a plano-concave lens with negative optical power; and the third lens group includes a biconvex lens with positive optical power.

[0011] Furthermore, the first lens group is a fixed group, the second lens group is a variable magnification group, and the third lens group is a compensation group.

[0012] According to another object of the present invention, the present invention provides a method for using the above-mentioned laser zoom homogenization heating system, comprising the following steps:

[0013] The light output position of the laser fiber-coupled output pigtail always satisfies the imaging relationship with the zoom system. The image of the fiber end face is imaged on the heated object using the lens system. The positions of the zoom group and the compensation group are changed respectively to achieve continuous change of the spot size.

[0014] Furthermore, in order to make the spot size at the action distance change smoothly, the motion trajectories of the zoom group and the compensation group are both nonlinear.

[0015] The technical solution of the present invention adopts a mechanical compensation zoom system. The light output position of the semiconductor laser fiber-coupled output pigtail always satisfies the imaging relationship with the zoom system. By changing the positions of the second lens group and the third lens group, the zoom homogenization of the high-power fiber-coupled output laser can be achieved. On the heating action surface, the spot height is uniform and the spot size is continuously adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is an optical principle diagram of an embodiment of the present invention when the light source is a square fiber coupled output laser;

[0018] Figure 2 It is a schematic cross-sectional view of the structure when the light source of the embodiment of the present invention is a square optical fiber coupled output laser.

[0019] Figure 3 It is a ZEMAX optical simulation diagram of the large-size laser irradiation effect a and the small-size laser irradiation effect b when the light source of the embodiment of the present invention is a square fiber coupled output laser.

[0020] Figure 4 This is an optical principle diagram of an embodiment of the present invention when the light source is a circular fiber coupled output laser;

[0021] Figure 5 It is a schematic cross-sectional view of the structure when the light source of an embodiment of the present invention is a circular fiber coupled output laser.

[0022] Figure 6 It is a ZEMAX optical simulation diagram of the large-size laser irradiation effect c and the small-size laser irradiation effect d when the light source of the embodiment of the present invention is a circular fiber coupled output laser;

[0023] Figure 7 This is a schematic structural diagram of a guide groove outer cylinder according to an embodiment of the present invention;

[0024] Figure 8 Schematic diagram of the structure of the guide groove inner cylinder according to an embodiment of the present invention.

[0025] In the figure, 1, QBH optical fiber connector; 2, square optical fiber holder; 3, square optical fiber connection holder; 4, square optical fiber fixing ring; 5, fixing screw; 6, square optical fiber first lens group barrel; 7, spacer; 8, first lens; 9, second lens; 10, third lens; 11, guide groove inner tube; 12, guide groove outer tube; 13, second lens group barrel; 14, second lens group; 15, positioning slider screw; 16, third lens group barrel; 17, third lens group; 18, pigtail; 19, round optical fiber holder; 20, round optical fiber connection holder; 21, round optical fiber fixing ring; 22, SMA905 optical fiber connector; 23, first lens group; 24, round optical fiber first lens group barrel; 25, hollow guide groove; 26, linear slide groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example 1

[0030] like Figure 1-Figure 8 As shown:

[0031] A laser zoom homogenization heating system includes a laser output head assembly, a zoom lens group and a zoom mechanical structure, wherein:

[0032] The laser output head assembly is a fiber-coupled output semiconductor laser light source, and the output pigtail is a square fiber or a round fiber, and the NA of the output pigtail is 0.22. The optical principle diagrams of the square fiber or the round fiber are as follows: Figure 1 and Figure 4 As shown, the square fiber coupled output laser pigtail is connected with a QBH fiber connector 1.

[0033] like Figure 2As shown, the laser output head assembly may include a QBH laser output head 1 and a square fiber holder 2 for use with a square optical fiber. The QBH laser output head 1 is fixed to the square optical fiber holder 2 by screws, and the square optical fiber holder 2 is connected to the square optical fiber connection holder 3 by threads. The square optical fiber connection holder 3 may fine-tune the distance between the QBH laser output head 1 and the square optical fiber connection holder 3, i.e., the distance between the pigtail 18 and the first lens 8, by means of a spiral transmission. The square optical fiber connection holder 3 is fixed to the square optical fiber first lens group barrel 6 by a square optical fiber fixing ring 4 and fixing screws 5, and may rotate coaxially.

[0034] like Figure 5 As shown, the laser output head assembly can also be an SMA905 optical fiber connector 22 and a round optical fiber seat 19 applied to a round optical fiber. The SMA905 optical fiber connector 22 is fixed to the round optical fiber seat 19 by threads, and the round optical fiber seat 19 is connected to the round optical fiber connection seat 20 by threads. The round optical fiber connection seat 20 can fine-tune the distance between the round optical fiber seat 19 and the round optical fiber connection seat 20, that is, the distance between the pigtail 18 and the first lens 8, through a spiral transmission method. The round optical fiber connection seat 20 is fixed to the round optical fiber first lens group barrel 24 by a round optical fiber fixing ring 21 and screws, and can rotate coaxially.

[0035] like Figure 1 and Figure 4 As shown, the zoom lens group includes a first lens group 23, a second lens group 14 and a third lens group 17. The laser passes through the first lens group 23, the second lens group 14 and the third lens group 17 in sequence. The first lens group 23 is fixed relative to the laser light source. The second lens group 14 and the third lens group 17 are respectively mounted on the second lens group barrel 13 and the third lens group barrel 16 with positioning slider screws 15. The second lens group barrel 13 and the third lens group barrel 16 are connected to the guide groove inner cylinder 11 and the guide groove outer cylinder 12 through the positioning slider screws 15. The guide groove outer cylinder 12 is manually rotated to change the positions of the second lens group 14 and the third lens group 17 to perform zooming.

[0036] like Figure 1 and Figure 4 As shown, the first lens group 23 includes three plano-convex lenses, namely the first lens 8, the second lens 9 and the third lens 10, in sequence along the light propagation direction, with positive optical power, and the first lens 8 and the second lens 9 are separated by a spacer 7; the second lens group is composed of plano-concave lenses, with negative optical power; the third lens group is composed of biconvex lenses, with positive optical power.

[0037] The first lens group 23 is a fixed group, the second lens group 14 is a zoom group, and the third lens group 17 is a compensation group. The light output position of the laser fiber coupling output pigtail and the zoom system always meet the imaging relationship. The lens system is used to image the image of the fiber end face on the heated object. The positions of the zoom group and the compensation group are changed respectively to achieve continuous change of the spot size, such as Figure 3 and Figure 6 In order to make the spot size change smoothly at the working distance, the motion trajectories of the zoom group and the compensation group are nonlinear.

[0038] like Figure 2 and Figure 5 As shown, the three plano-convex lenses of the first lens group 23 are fixed in the first lens group barrel 6 , the second lens group lens 14 is fixed in the second lens group barrel 13 , and the third lens group lens 17 is fixed in the third lens group barrel 16 .

[0039] The square fiber first lens group barrel 6 and the round fiber first lens group barrel 24 are connected to the guide groove inner barrel 11 and the guide groove outer barrel 12 respectively through the slider screw 15, and the slider screw 15 passes through the guide groove inner barrel 11 and the guide groove outer barrel 12 respectively. The guide groove outer barrel 12 is sleeved on the outside of the guide groove inner barrel 11, and the guide groove outer barrel 12 is manually rotated to drive the slider screw 15 to make the second lens group barrel 13 and the third lens group barrel 16 slide coaxially back and forth in the guide groove inner barrel 11 to achieve focusing.

[0040] In this embodiment, Figure 7 and Figure 8 As shown, a straight slide groove 26 is provided on the outer wall of the guide groove inner cylinder 11, and a hollow guide groove 25 is provided on the outer wall of the guide groove outer cylinder 12 in a spiral curve shape. The slider screw 15 passes through the hollow guide groove 25, and one inner end of the slider screw 15 is connected to the square fiber first lens group barrel 6 or the round fiber first lens group barrel 24, and one outer end of the slider screw 15 is slidably connected to the guide groove outer cylinder 12. The guide groove outer cylinder 12 is rotatably arranged on the outside of the guide groove inner cylinder 11. Therefore, by rotating the guide groove outer cylinder 12, the second lens group barrel 13 and the third lens group barrel 16 can be driven to slide back and forth inside the guide groove inner cylinder 11 to achieve zooming.

[0041] The present invention has a simple structure and an ingenious design. It adopts a mechanical compensation zoom system. The light output position of the semiconductor laser fiber-coupled output pigtail always satisfies the imaging relationship with the zoom system. By changing the positions of the second lens group and the third lens group, the zoom homogenization of the high-power fiber-coupled output laser can be achieved. On the heating action surface, the light spot height is uniform and the light spot size is continuously adjustable. The present invention is applied to high-power fiber-coupled output lasers, and can achieve a continuously adjustable light spot size within the range of 15-150mm at a distance of 1.5m from the light source. The light spot has a clear edge and high uniformity, and can achieve the purpose of uniform irradiation heating at a fixed working distance.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser zoom homogenization heating system, characterized in that: The invention comprises a laser output head assembly, a zoom lens group and a zoom mechanical structure. The zoom lens group comprises a first lens group, a second lens group and a third lens group. The position of the first lens group relative to the laser output head assembly is fixed. The laser emitted by the laser output head assembly passes through the first lens group, the second lens group and the third lens group in sequence. The second lens group and the third lens group are respectively connected to the zoom mechanical structure. The zoom mechanical structure zooms the positions of the second lens group and the third lens group.

2. The laser zoom homogenization heating system according to claim 1, characterized in that: The zoom mechanical structure includes a guide groove inner cylinder, in which a second lens group barrel and a third lens group barrel are slidably arranged, the second lens group is fixed in the second lens group barrel, and the third lens group is fixed in the third lens group barrel, a guide groove outer cylinder is sleeved on the outer side of the guide groove inner cylinder, the second lens group barrel and the third lens group barrel are respectively connected with positioning slider screws, and the positioning slider screws pass through the guide groove inner cylinder and the guide groove outer cylinder.

3. The laser zoom homogenization heating system according to claim 1, characterized in that: The laser output head assembly comprises a laser light source, and the laser light source is a fiber-coupled output semiconductor laser light source.

4. The laser zoom homogenization heating system according to claim 3, characterized in that: The NA of the output pigtail of the fiber-coupled output semiconductor laser light source is 0.

22.

5. The laser zoom homogenization heating system according to claim 3, characterized in that: The laser output head assembly includes a QBH laser output head and a square fiber holder for square optical fibers. The QBH laser output head is fixed to the square optical fiber holder by screws. The square optical fiber holder is threadedly connected to a square optical fiber connection holder. The square optical fiber connection holder is fixed to the first lens group barrel of the square optical fiber by a square optical fiber fixing ring and fixing screws.

6. The laser zoom homogenization heating system according to claim 3, characterized in that: The laser output head assembly includes an SMA905 optical fiber connector and a round optical fiber seat for round optical fibers. The SMA905 optical fiber connector is fixed to the round optical fiber seat by threads. The round optical fiber seat is connected to the round optical fiber connection seat by threads. The round optical fiber connection seat is fixed to the first lens group barrel of the round optical fiber by a round optical fiber fixing ring and screws.

7. The laser zoom homogenization heating system according to claim 1, characterized in that: The first lens group includes three plano-convex lenses, namely, a first lens, a second lens and a third lens, in sequence along the laser propagation direction, with positive optical power; the second lens group includes a plano-concave lens with negative optical power; and the third lens group includes a biconvex lens with positive optical power.

8. The laser zoom homogenization heating system according to claim 1, characterized in that: The first lens group is a fixed group, the second lens group is a variable magnification group, and the third lens group is a compensation group.

9. The method for using the laser zoom homogenization heating system according to claim 8, characterized in that: The steps include: The light output position of the laser fiber-coupled output pigtail always satisfies the imaging relationship with the zoom system. The image of the fiber end face is imaged on the heated object using the lens system. The positions of the zoom group and the compensation group are changed respectively to achieve continuous change of the spot size.

10. The method for using the laser zoom homogenization heating system according to claim 9, characterized in that: In order to make the spot size change smoothly at the effective distance, the motion trajectories of the zoom group and the compensation group are both nonlinear.

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