阅读说明：本技术 扰模器 (Mode scrambler ) 是由 许亮 曹丛绘 杨科 陈明 于 2020-12-09 设计创作，主要内容包括：本发明提供一种扰模器,包括底座、旋转挤压块以及旋转驱动机构；旋转挤压块的右端沿前后向的轴线转动连接底座；底座设有与旋转挤压块上下相对的挤压部；旋转驱动机构设于底座,旋转驱动机构与旋转挤压块动力耦合连接,以驱动旋转挤压块向挤压部转动,而通过旋转挤压块与挤压部上下挤压光纤；旋转挤压块与挤压部用于挤压光纤的挤压面为相互吻合的凹凸面。本发明提供的扰模器,通过扰模器的机械结构对光纤进行摆动挤压,从而打破光纤中传输激光的模式平衡,增强模间耦合作用,控制能量的传递和交换,达到调节激光光束质量的效果,最终输出理想光束质量的激光。(The invention provides a mold scrambler, which comprises a base, a rotary extrusion block and a rotary driving mechanism, wherein the rotary extrusion block is arranged on the base; the right end of the rotary extrusion block is rotationally connected with the base along a front-back axis; the base is provided with an extrusion part which is opposite to the rotary extrusion block up and down; the rotary driving mechanism is arranged on the base and is in power coupling connection with the rotary extrusion block so as to drive the rotary extrusion block to rotate towards the extrusion part and extrude the optical fiber up and down through the rotary extrusion block and the extrusion part; the extrusion surfaces of the rotary extrusion block and the extrusion part for extruding the optical fiber are concave-convex surfaces which are matched with each other. The mode scrambler provided by the invention swings and extrudes the optical fiber through the mechanical structure of the mode scrambler, so that the mode balance of laser transmission in the optical fiber is broken, the coupling effect between the modes is enhanced, the transmission and exchange of energy are controlled, the effect of adjusting the quality of laser beams is achieved, and finally the laser with ideal beam quality is output.)

1. A mold scrambler is characterized by comprising a base, a rotary extrusion block and a rotary driving mechanism;

the right end of the rotary extrusion block is rotationally connected with the base along a front-back axis;

the base is provided with an extrusion part which is opposite to the rotary extrusion block up and down;

the rotary driving mechanism is arranged on the base and is in power coupling connection with the rotary extrusion block so as to drive the rotary extrusion block to rotate towards the extrusion part and extrude the optical fiber up and down through the rotary extrusion block and the extrusion part;

the rotary extrusion block and the extrusion surface of the extrusion part for extruding the optical fiber are concave-convex surfaces which are matched with each other.

2. The mode scrambler of claim 1, wherein the rotary drive mechanism is a differential drive mechanism.

3. The die scrambler according to claim 2, wherein said base has a threaded mounting hole extending vertically through the left end of said rotary extrusion block;

the rotation driving mechanism comprises a differential screw and a matched screw;

the differential screw is arranged at the screw thread mounting hole in a threaded manner, and a central hole screw thread is arranged in the differential screw in a vertically penetrating manner;

the matched screw thread is arranged at the central hole thread, and one end of the matched screw is abutted to the left end of the rotary extrusion block.

4. The die scrambler according to claim 3, wherein a ball groove is formed in an end surface of the mating screw near the left end of the rotary extrusion block, a ball is disposed in the ball groove, and the mating screw abuts against the left end of the rotary extrusion block through the ball.

5. The mold scrambler according to any of claims 1 to 4, wherein the front side of said base is provided with a mounting slot, and said rotary extrusion block is rotatably connected to the bottom wall of said mounting slot;

the lower side wall of the mounting groove forms the extrusion part, and the left side wall of the mounting groove is penetratingly provided with a left perforation for the optical fiber to extend into the space between the rotary extrusion block and the extrusion part from the left perforation;

the rotary driving mechanism is arranged on the upper side wall of the mounting groove.

6. The mold scrambler according to claim 5, wherein the upper side wall of the mounting groove is connected to the rotary extrusion block through a reset mechanism for driving the rotary extrusion block to rotate towards the upper side wall of the mounting groove.

7. The mode scrambler according to claim 6, wherein the upper side wall of said mounting groove is vertically penetrated with a mounting hole, and said reset mechanism comprises a tension screw and a spring;

the lower end of the tensioning screw extends into the mounting groove from the mounting hole, and is in threaded connection with the rotary extrusion block;

the upper end of the tensioning screw is positioned outside the mounting groove, the upper end of the tensioning screw is provided with an annular abutting part, and the annular abutting part is positioned above the mounting hole;

the spring is sleeved outside the upper end of the tensioning screw, and is positioned between the annular abutting part and the upper hole edge of the mounting hole.

8. The mold scrambler according to claim 5, wherein a sliding slot is formed through the rotary extrusion block, the sliding slot extends along the rotation direction of the rotary extrusion block, a compression screw is disposed at the sliding slot, and a threaded end of the compression screw passes through the rotary extrusion block from the sliding slot and is in threaded connection with the bottom wall of the mounting groove, so as to limit the rotary extrusion block forward and backward.

9. The mold scrambler according to claim 5, wherein a cover plate is disposed at the notch of the mounting groove to limit the forward and backward positions of the rotary compression block by the cover plate and the groove bottom of the mounting groove.

10. The die scrambler according to any of claims 1 to 4, wherein the extrusion surfaces of said rotary extrusion block and said extrusion part are undulated curved surfaces that fit each other.

Technical Field

The invention relates to the technical field of optical fibers, in particular to a mode scrambler.

Background

The output power of the high-power optical fiber laser is closely related to the diameter of the fiber core of the optical fiber: in order to prevent the possible optical damage and nonlinear effect problem of the fiber end face under high power, the fiber diameter of the optical fiber is generally increased along with the increase of the laser power, but the thick core causes the beam quality of the output laser to be reduced.

Disclosure of Invention

The invention provides a mode scrambler, which is used for solving the problem that a laser beam is deteriorated when a fiber core diameter of a high-power laser is increased to improve laser power.

The invention provides a mold scrambler, which comprises a base, a rotary extrusion block and a rotary driving mechanism, wherein the rotary extrusion block is arranged on the base;

the right end of the rotary extrusion block is rotationally connected with the base along a front-back axis;

the base is provided with an extrusion part which is opposite to the rotary extrusion block up and down;

the rotary driving mechanism is arranged on the base and is in power coupling connection with the rotary extrusion block so as to drive the rotary extrusion block to rotate towards the extrusion part and extrude the optical fiber up and down through the rotary extrusion block and the extrusion part;

the rotary extrusion block and the extrusion surface of the extrusion part for extruding the optical fiber are concave-convex surfaces which are matched with each other.

According to the mode scrambler provided by the invention, the rotary driving mechanism is a differential transmission mechanism.

According to the die scrambler provided by the invention, the base is provided with a threaded mounting hole corresponding to the left end of the rotary extrusion block in a vertically penetrating manner;

the rotation driving mechanism comprises a differential screw and a matched screw;

the differential screw is arranged at the screw thread mounting hole in a threaded manner, and a central hole screw thread is arranged in the differential screw in a vertically penetrating manner;

the matched screw thread is arranged at the central hole thread, and one end of the matched screw is abutted to the left end of the rotary extrusion block.

According to the die scrambler provided by the invention, the end face, close to the left end of the rotary extrusion block, of the matched screw is provided with a ball groove, a ball is arranged at the ball groove, and the matched screw is abutted against the left end of the rotary extrusion block through the ball.

According to the mold scrambler provided by the invention, the front side surface of the base is provided with a mounting groove, and the rotary extrusion block is rotationally connected with the bottom wall of the mounting groove;

the lower side wall of the mounting groove forms the extrusion part, and the left side wall of the mounting groove is penetratingly provided with a left perforation for the optical fiber to extend into the space between the rotary extrusion block and the extrusion part from the left perforation;

the rotary driving mechanism is arranged on the upper side wall of the mounting groove.

According to the mold scrambler provided by the invention, the upper side wall of the mounting groove is connected with the rotary extrusion block through the reset mechanism, and the reset mechanism is used for driving the rotary extrusion block to rotate towards the upper side wall of the mounting groove.

According to the mold scrambler provided by the invention, the upper side wall of the mounting groove is provided with a mounting hole in a vertically penetrating manner, and the reset mechanism comprises a tensioning screw and a spring;

the lower end of the tensioning screw extends into the mounting groove from the mounting hole, and is in threaded connection with the rotary extrusion block;

the upper end of the tensioning screw is positioned outside the mounting groove, the upper end of the tensioning screw is provided with an annular abutting part, and the annular abutting part is positioned above the mounting hole;

the spring is sleeved outside the upper end of the tensioning screw, and is positioned between the annular abutting part and the upper hole edge of the mounting hole.

According to the mold scrambler provided by the invention, the rotary extrusion block is provided with the sliding groove in a front-back penetrating manner, the sliding groove extends along the rotation direction of the rotary extrusion block, the sliding groove is provided with the compression screw, and the threaded end of the compression screw penetrates through the rotary extrusion block from the sliding groove to be in threaded connection with the bottom wall of the mounting groove and is used for limiting the front and back of the rotary extrusion block.

According to the mold scrambler provided by the invention, a cover plate is arranged at the notch of the mounting groove so as to limit the front and back of the rotary extrusion block through the cover plate and the groove bottom of the mounting groove.

According to the die scrambler provided by the invention, the extrusion surfaces of the rotary extrusion block and the extrusion part are mutually matched wavy curved surfaces.

The mode scrambler provided by the invention swings and extrudes the optical fiber through the mechanical structure of the mode scrambler, so that the mode balance of laser transmission in the optical fiber is broken, the coupling effect between the modes is enhanced, the transmission and exchange of energy are controlled, the effect of adjusting the quality of laser beams is achieved, and finally the laser with ideal beam quality is output.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 mode scrambler provided in the present invention;

FIG. 2 is a schematic view of the mode scrambler of FIG. 1 from another perspective;

FIG. 3 is a cross-sectional view of the mode scrambler of FIG. 2 taken along line A-A;

FIG. 4 is a schematic diagram of a portion of the mode scrambler of FIG. 1;

FIG. 5 is a schematic view of the base of FIG. 4;

FIG. 6 is a schematic view of the base of FIG. 5 from another perspective;

FIG. 7 is a schematic view of the rotary extrusion block of FIG. 4;

FIG. 8 is a schematic view of the rotary extrusion block of FIG. 7 from another perspective;

reference numerals:

100: a mode scrambler; 1: a base; 11: a pressing section;

12: a threaded mounting hole; 13: mounting grooves; 14: punching a hole on the left side;

15: mounting holes; 16: punching a hole on the right side; 17: a notch;

2: rotating the extrusion block; 21: a chute; 22: a compression screw;

23: rotating the positioning pin; 24: a bearing; 3: a rotation driving mechanism;

31: a differential screw; 32: a mating screw; 33: a ball bearing;

4: a reset mechanism; 41: tightening the screw; 42: a spring;

43: a gasket; 5: a cover plate; 51: a cover plate screw;

6: protecting the sleeve; 200: an optical fiber.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, 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.

The mode scrambler of the present invention is described below with reference to fig. 1 to 8, and as shown in fig. 1, 2 and 4, the mode scrambler 100 includes a base 1, a rotary extrusion block 2 and a rotary driving mechanism 3.

As shown in fig. 3 and 4, the right end of the rotary extrusion block 2 is rotatably connected to the base 1 along a forward and backward axis. Specifically, in this embodiment, the base 1 is provided with a positioning pin hole, a rotation positioning pin 23 is inserted into the positioning pin hole, a bearing 24 is installed on the rotation positioning pin 23, and the rotation extrusion block 2 is sleeved on the bearing 24.

As shown in fig. 1, 3 and 7, the base 1 is provided with a pressing part 11 vertically opposite to the rotary pressing block 2; the rotary driving mechanism 3 is disposed on the base 1, and the rotary driving mechanism 3 is in power coupling connection with the rotary extrusion block 2 to drive the rotary extrusion block 2 to rotate towards the extrusion portion 11, and the optical fiber 200 is extruded up and down through the rotary extrusion block 2 and the extrusion portion 11 (as shown in fig. 1, the optical fiber 200 penetrates through the protection sleeve 6).

As shown in fig. 3, 4 and 7, the pressing surfaces of the rotary pressing block 2 and the pressing portion 11 for pressing the optical fiber 200 are concave-convex surfaces that are matched with each other. Specifically, in the present embodiment, the pressing surfaces of the rotary pressing block 2 and the pressing portion 11 are wavy curved surfaces that fit each other.

According to the mode scrambler 100 provided by the invention, the optical fiber 200 is subjected to swinging extrusion through the mechanical structure of the mode scrambler 100, so that the mode balance of laser transmission in the optical fiber 200 is broken, the coupling effect between the modes is enhanced, the energy transmission and exchange are controlled, the effect of adjusting the laser beam quality is achieved, and finally laser with ideal beam quality is output. The adjustable high-power fiber laser system is applied to a high-power fiber laser system, the adjustability and controllability of the beam quality and the energy distribution of output laser are realized, and the application effect and the application field of the high-power fiber laser system are improved.

In the present embodiment, the rotation driving mechanism 3 is a differential transmission mechanism, and specifically, as shown in fig. 1 and 3, in the present embodiment, the base 1 is provided with a threaded mounting hole 12 penetrating up and down corresponding to the left end of the rotation extrusion block 2; the rotation driving mechanism 3 comprises a differential screw 31 and a matched screw 32; the differential screw 31 is installed at the thread installation hole 12 in a threaded manner, and the differential screw 31 is provided with a central hole thread in a vertically penetrating manner; the matching screw 32 is arranged at the thread position of the central hole in a threaded mode, and one end of the matching screw 32 is abutted to the left end of the rotary extrusion block 2. The optical fiber 200 to be extruded is threaded in the protective sleeve 6 and then placed between the special designed extrusion waveforms of the base 1 and the rotary extrusion block 2, and the rotary extrusion block 2 is adjusted to rotate through the rotary driving mechanism 3 to perform appropriate extrusion, so that the quality of the light beam is adjusted.

Further, as shown in fig. 1 and fig. 3, in the present embodiment, a ball groove is provided on an end surface of the mating screw 32 near the left end of the rotary extrusion block 2, a ball 33 is provided at the ball groove, and the mating screw 32 abuts against the left end of the rotary extrusion block 2 through the ball 33. The external thread and the central hole thread of the differential screw 31 are concentric and same-rotation-direction threads, but lead is different. If the lead of the excircle thread of the differential screw 31 is PhA and the lead of the central hole thread of the differential screw 31 is PhB, when the differential screw 31 is rotated for adjustment (the matched screw 32 is not rotated), the adjustment distance of one rotation is PhA-PhB. By controlling the difference between PhA and PhB, fine distance adjustment can be achieved to meet the crush sensitivity when the optical fiber 200 is crush-adjusted. The matching screw 32 is used as a movable top head and is arranged at the thread of the central hole of the differential screw 31, and the ball 33 at the top of the matching screw is pressed against the rotary extrusion block 2.

As shown in fig. 3 and 4, the front side surface of the base 1 is provided with a mounting groove 13, and the rotary extrusion block 2 is rotatably connected with the bottom wall of the mounting groove 13; the lower side wall of the mounting groove 13 forms an extrusion part 11, and the left side wall of the mounting groove 13 is penetratingly provided with a left through hole 14 for the optical fiber 200 to extend from the left through hole 14 to the space between the rotary extrusion block 2 and the extrusion part 11; the rotation driving mechanism 3 is provided on an upper side wall of the mounting groove 13. The inner side wall of the mounting groove 13 forms a swing limit for the rotating extrusion block 2, and as shown in fig. 3 and 5, in the present embodiment, the right side wall of the mounting groove 13 is penetratingly provided with a right perforation 16 for the optical fiber 200 to extend out of the mounting groove 13 from the right perforation 16.

As shown in fig. 1 and 3, the upper side wall of the mounting groove 13 is connected to the rotary extrusion block 2 through a reset mechanism 4, and the reset mechanism 4 is used for driving the rotary extrusion block 2 to rotate towards the upper side wall of the mounting groove 13. Specifically, the upper side wall of the mounting groove 13 is provided with a mounting hole 15 penetrating up and down (in this embodiment, the base 1 is provided with a notch 17, the mounting hole 15 is provided at the notch 17, and the mounting hole 15 is a counter bore), and the reset mechanism 4 includes a tension screw 41 and a spring 42; the lower end of the tensioning screw 41 extends into the mounting groove 13 from the mounting hole 15, and the lower end of the tensioning screw 41 is in threaded connection with the rotary extrusion block 2; the upper end of the tensioning screw 41 is positioned outside the mounting groove 13, the upper end of the tensioning screw 41 is provided with an annular abutting part, and the annular abutting part is positioned above the mounting hole 15; the spring 42 is fitted over the upper end of the tension screw 41, and the spring 42 is located between the annular abutment portion and the upper hole edge of the mounting hole 15. Wherein, tensioning screw 41 is equipped with the gasket 43, and the gasket 43 forms annular butt portion, and spring 42 wears on tensioning screw 41's screw rod, and both ends act on the upper hole edge of mounting hole 15 and tensioning screw 41's the gasket 43 of the screw rod root respectively, provide outside power for tensioning screw 41, pull extrusion piece 2 and press on the ball 33 of supporting screw 32.

As shown in fig. 1, 4 and 8, in the present embodiment, a sliding groove 21 is provided in the rotary extrusion block 2 to penetrate forward and backward, the sliding groove 21 extends along the rotation direction of the rotary extrusion block 2, a compression screw 22 is provided at the sliding groove 21, and a threaded end of the compression screw 22 penetrates through the rotary extrusion block 2 from the sliding groove 21 to be in threaded connection with the bottom wall of the mounting groove 13, so as to limit the rotary extrusion block 2 forward and backward. After the rotation extrusion adjustment is completed, the compression screw 22 compresses the rotation extrusion block 2 on the base 1, and the locking and positioning are completed.

As shown in fig. 1 and 2, in the present embodiment, a cover plate 5 is provided at the notch of the mounting groove 13 to limit the rotation compression block 2 forward and backward by the groove bottom of the cover plate 5 and the mounting groove 13, and the cover plate 5 is fixed to the base 1 by a cover plate screw 51. The rotating pressing block 2 can be pressed by the cover plate 5.

As shown in fig. 4, 5 and 7, the base 1 and the rotary extrusion block 2 have specially designed extrusion waveforms, the waveforms are mutually engaged and complementary, and the energy-transmitting optical fiber 200 is extruded by the extrusion waveforms to generate different degrees of bending deformation of the optical fiber 200, so that a mode coupling effect is generated, and the beam quality of the output laser is changed. The included angle c formed by the central lines a and b of the specially designed extrusion waveforms on the base 1 and the rotary extrusion block 2 at the rotation center (the rotation center is the rotary positioning pin 23), and the designed limit structure controls the adjusting angle of the included angle c to be + delta₁To-delta₂Within the range of (1). When a and b are parallel, i.e. c is 0 °, the distance between a and b is D, and the extruded optical fiber 200 is in the full-wave extrusion initial state, and meanwhile, the standard beam quality extrusion state is obtained by controlling the value of D. Therefore, when the quality of the actual laser beam is adjusted, the two parameters of the actual extrusion wave number of the extrusion waveform and the average extrusion distance under full-wave extrusion are controlled by controlling the included angle c, and the large enough expansion adjusting range and the improvement adjusting sensitivity are obtained in a limited space to tune the quality of the actual laser beam so as to approach the quality value of the standard beam. When is + delta₁<c<When the temperature is 0 ℃, the actual extrusion wave number of the extruded optical fiber 200 is less than the wave number of the waveform on the base 1 and the rotary extrusion block 2, and the average extrusion distance is less than D; when c is 0 °, the extruded optical fiber 200 is in a full-waveform extrusion initial state, and the average extrusion distance is equal to D; 0 degree<c<-Δ₂While the extruded optical fiber 200 is in a full waveform extruded stateThe average crush distance is greater than D.

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.