Nonlinear polarization rotation mode locking module device and mode locking adjusting clamp

Abstract

The utility model relates to the technical field of ultrafast fiber lasers, in particular to a nonlinear polarization rotation mode locking module device and a mode locking adjusting clamp. The mold locking module device comprises a shell, an upper cover plate, a lower cover plate and a worm gear, an upper groove is formed in the top of the shell, a lower groove is formed in the bottom of the shell, the upper cover plate is installed in the upper groove of the shell, and the lower cover plate is installed in the lower groove of the shell; a first semicircular groove and a first square groove which are perpendicular to each other are formed in the bottom of the upper groove of the shell; a second semicircular groove and a second square groove which are perpendicular to each other are formed in the bottom of the upper cover plate; the worm wheel comprises a wheel disc and circular truncated cones, the circular truncated cones are arranged at the two ends of the wheel disc, the circular truncated cones are installed in a space defined by the first semicircular groove and the second semicircular groove, a slide is installed on the end face of each circular truncated cone, and the wheel disc is located in a space defined by the first square groove and the second square groove. According to the utility model, the mold locking process is simplified, and the mold locking precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrafast fiber lasers, in particular to a nonlinear polarization rotation mode-locking module device and a mode-locking adjustment fixture. Background Art

[0002] Ultrafast fiber lasers are capable of producing ultrashort laser pulses (typically on the picosecond or femtosecond scale). They are widely used in scientific research, medical treatment, materials processing, and other fields. The operating principle of ultrafast fiber lasers involves the generation and stable output of ultrashort pulses through nonlinear effects (such as nonlinear polarization rotation) and precise tuning of intracavity optical elements.

[0003] Existing ultrafast fiber lasers are assembled using discrete optical components. These discrete components include PDI polarization-dependent isolators, PBS polarization splitters, WDM wavelength division multiplexers, monitoring ports, and polarization controllers, etc. These components are connected in series via optical fibers. During mode locking, the polarization state of the laser pulse is usually controlled by manually rotating the wave plate combination, and polarization selection is performed through a polarization beam splitter prism to ultimately achieve narrowing of the laser pulse and mode-locked output. The adjustment process is cumbersome, inefficient, and low in precision. Secondly, these discrete components not only increase the number of welding points, but also make the controller bulky and the integration efficiency low. The assembly process of discrete components is complex, prone to errors, and has high maintenance costs.

[0004] The locking module of the prior art has the following technical problems:

[0005] 1. The clamping process is complicated, inefficient and low-precision.

[0006] 2. Discrete components are bulky, have low integration efficiency, and a complicated assembly process. Utility Model Content

[0007] In order to solve at least one of the above-mentioned technical problems, an embodiment of the present invention provides a nonlinear polarization rotation mode locking module device.

[0008] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0009] A nonlinear polarization rotation locking module device comprises: a shell, an upper cover plate, a lower cover plate and a worm gear, wherein the shell is provided with an upper groove on the top and a lower groove on the bottom, the upper cover plate is mounted in the upper groove of the shell, and the lower cover plate is mounted in the lower groove of the shell; the bottom of the upper groove of the shell is provided with a first semicircular groove and a first square groove which are perpendicular to each other, and the bottom of the upper cover plate is provided with a second semicircular groove and a second square groove which are perpendicular to each other; the worm gear comprises a wheel disc and a frustum, the frustum being provided at both ends of the wheel disc and mounted in a space enclosed by the first semicircular groove and the second semicircular groove, and a glass slide being mounted on the end face of the frustum, and the wheel disc is located in the space enclosed by the first square groove and the second square groove.

[0010] An embodiment of the present utility model also provides a locking adjustment fixture for adjusting the nonlinear polarization rotation locking module device as described above, the locking adjustment fixture includes a fixture seat, a motor and a worm, the motor is mounted on the fixture seat, the worm is mounted on the output shaft of the motor, the housing is mounted on the fixture seat, and the worm is engaged with the worm wheel.

[0011] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0012] 1. The nonlinear polarization rotation locking module device mainly consists of a housing, an upper cover, a lower cover, and a worm gear. The top of the housing is provided with an upper groove for accommodating the upper cover, and the bottom is provided with a lower groove for mounting the lower cover. The upper and lower grooves are provided with a semicircular groove and a square groove, respectively, that match the worm gear. The worm gear is structured as a disc with a rounded table at each end. The rounded table is installed in the semicircular groove, and the disc is embedded in the square groove. This design allows the worm gear (i.e., the glass slide) to rotate stably within the device. During locking, the worm gear is adjusted by adjusting the fixture to obtain the optimal locking angle of the glass slide. The worm gear is then fixed with glue, which simplifies the locking process and improves the locking accuracy. After locking, the square groove prevents the worm gear from contacting or colliding with external objects, preventing the worm gear from loosening due to external forces after being glued and fixed, thereby causing the locking state to change.

[0013] 2. The coordination of the housing, upper cover, and lower cover allows for reasonable space to be arranged for each device, providing a foundation for the subsequent installation of various components. This reduces the volume of the nonlinear polarization rotation mode-locking module in the ultrafast laser seed source and improves the reliability of the mode-locking optical path.

[0014] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings, which constitute part of this specification, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and are not intended to unduly limit the present invention. Furthermore, the spacing or dimensions between components are exaggerated to illustrate the locations of the components, and the schematic diagrams are for illustrative purposes only.

[0016] Figure 1 This is a schematic diagram of a clamping module device provided by an embodiment of the present utility model;

[0017] Figure 2 This is a front view of the clamping module device provided by an embodiment of the utility model;

[0018] Figure 3 This is a top view of the clamping module device provided by an embodiment of the present utility model;

[0019] Figure 4 This is a left view of the clamping module device provided by an embodiment of the utility model;

[0020] Figure 5 This is a perspective view of the upper side of the housing provided by an embodiment of the present utility model;

[0021] Figure 6 This is a perspective view of the lower side of the housing provided by an embodiment of the present utility model;

[0022] Figure 7 This is a rear view of the housing provided by an embodiment of the present utility model;

[0023] Figure 8 This is a top view of the housing provided by an embodiment of the present utility model;

[0024] Figure 9 This is a right side view of the housing provided by an embodiment of the present utility model;

[0025] Figure 10 This is a three-dimensional diagram of a worm gear provided by an embodiment of the present utility model;

[0026] Figure 11 It is a side view of the worm gear provided by an embodiment of the present utility model;

[0027] Figure 12 This is a bottom view of the upper cover provided by an embodiment of the present utility model;

[0028] Figure 13 This is a right side view of the upper cover provided by an embodiment of the present utility model;

[0029] Figure 14 This is a front view of the lower cover provided by an embodiment of the present utility model;

[0030] Figure 15 This is a top view of the lower cover provided by an embodiment of the present utility model;

[0031] Figure 16 This is a left view of the lower cover provided by an embodiment of the utility model;

[0032] Figure 17 This is a schematic diagram of the cooperation between the housing and the worm gear provided in an embodiment of the present utility model;

[0033] Figure 18 This is a schematic diagram of a mold clamping adjustment fixture provided by an embodiment of the present utility model;

[0034] Figure 19 This is a schematic diagram of a clamp seat provided by an embodiment of the present utility model;

[0035] Figure 20 This is a schematic diagram of the debugging state provided by an embodiment of the present utility model;

[0036] In the figure: 1. Housing; 11. Upper groove; 12. First semicircular groove; 13. First square groove; 14. Lower groove; 2. Upper cover; 21. Second semicircular groove; 22. Second square groove; 3. Lower cover; 4. Fiber protection sleeve; 5. End cap; 6. Worm gear; 61. Rotary disc; 62. Round table; 63. Slide slot; 7. Fixture holder; 71. Mounting hole; 72. Clearance slot; 73. Carrier; 8. Worm; 9. Motor; DETAILED DESCRIPTION

[0037] It should be noted that the following detailed description is illustrative and is intended to further illustrate the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Explanation of terms:

[0039] DI polarization-dependent isolator: used to isolate light with different polarization states, prevent unnecessary feedback into the laser cavity, and maintain the unidirectionality and stability of the optical path.

[0040] PBS polarization beam splitter: used to separate or combine light beams with different polarization states to achieve polarization control in the optical path.

[0041] WDM wavelength division multiplexer: used to combine or separate optical signals of different wavelengths, allowing light of different wavelengths to be transmitted in the same optical fiber.

[0042] Monitoring port: used to monitor the signal parameters in the optical path in real time, such as power, wavelength, etc., to ensure that the system works in the best condition.

[0043] Polarization controller: used to adjust the polarization state of light waves in optical fibers. By changing the polarization state of light, it regulates nonlinear effects and thus affects the mode-locking state.

[0044] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, in one embodiment of the present invention, a nonlinear polarization rotation locking module device is proposed, comprising: a housing 1, an upper cover plate 2, a lower cover plate 3 and a worm gear 6. Figure 5 、 Figure 6 As shown, the top of the housing 1 is provided with an upper groove 11, and the bottom is provided with a lower groove 14. The upper cover plate 2 is installed in the upper groove 11 of the housing 1, and the lower cover plate 3 is installed in the lower groove 14 of the housing 1;

[0045] like Figure 7 、 Figure 8 、 Figure 9 As shown, the bottom of the upper groove 11 of the housing 1 is provided with a first semicircular groove 12 and a first square groove 13 which are perpendicular to each other. Figure 12 、 Figure 13 As shown, the bottom of the upper cover plate 2 is provided with a second semicircular groove 21 and a second square groove 22 which are perpendicular to each other. Figure 10 、 Figure 11 As shown, the worm wheel 6 includes a wheel disc 61 and a frustum 62, and the frustum 62 is arranged at both ends of the wheel disc 61. Figure 17 As shown, the truncated table 62 is installed in the space surrounded by the first semicircular groove 12 and the second semicircular groove 21, and a glass slide is installed on the end surface of the truncated table 62. The wheel 61 is located in the space surrounded by the first square groove 13 and the second square groove 22.

[0046] The nonlinear polarization rotation locking module device primarily consists of a housing 1, an upper cover plate 2, a lower cover plate 3, and a worm gear 6. The housing 1 has an upper groove 11 at the top for accommodating the upper cover plate 2, and a lower groove 14 at the bottom for mounting the lower cover plate 3. The upper groove 11 and the lower groove 14 are respectively configured with a semicircular groove and a square groove that match the worm gear 6. The worm gear 6 comprises a disc 61 with rounded bosses 62 at each end. The rounded bosses 62 are mounted within the semicircular grooves, and the disc 61 is embedded within the square grooves. This design allows the worm gear 6 (i.e., the glass slide) to rotate stably within the device. During locking, the worm gear 6 is adjusted by adjusting the fixture to obtain the optimal locking angle for the glass slide, and then the worm gear 6 is fixed by glue. This simplifies the locking process and improves locking accuracy. After locking, the square grooves prevent the worm gear 6 from contacting or colliding with external objects, preventing it from loosening due to external forces after being glued in place, which could cause a change in the locking state.

[0047] The upper groove 11 on the top of the shell 1 is in the shape of a U-shaped character with a downward concave center. The upper cover plate 2 is inserted into the U-shaped upper groove 11. The bottom of the upper cover plate 2 is pressed against the top surface of the upper groove 11. A boss is formed at the front end of the upper cover plate 2 (such as Figure 13 The bottom of the boss is pressed against the top surface of the lower cover plate 3 to ensure the sealing and stability between the upper cover plate 2 and the lower cover plate 3, and to ensure the precise positioning of the worm gear 6 and the overall stability of the clamping module.

[0048] like Figure 14 、 Figure 15 、 Figure 16 As shown, the side of the lower cover plate 3 is an L-shaped structure, consisting of a horizontal plate and a vertical plate. The horizontal plate is located at the bottom of the lower groove 14 of the housing 1, and the vertical plate is embedded in the housing 1, with the front end of the vertical plate flush with the front end of the housing 1. The upper cover plate 2 is pressed against the top surface of the vertical plate of the lower cover plate 3. The horizontal plate is located at the bottom of the lower groove 14 of the housing 1, providing support for the entire device; the bottom of the upper cover plate 2 is pressed against the top surface of the vertical plate of the lower cover plate 3. This design not only strengthens the sealing of the module, but also improves the overall strength of the structure, ensuring that the module will not shift or loosen during operation.

[0049] There are two first square grooves 13 and two second square grooves 22. The two first square grooves 13 are arranged in parallel and divide the first semicircular groove 12 into three sections. The two second square grooves 22 are arranged in parallel and divide the second semicircular groove 21 into three sections. Therefore, two worm gears 6 can be installed in the clamping module device.

[0050] The bottom of the upper slot 11 of the housing 1 is provided with a threaded hole, arranged vertically and located between the two first square slots 13. The upper cover plate 2 is provided with bolt holes, which are installed on the housing 1 using bolts passing through the bolt holes of the upper cover plate 2. This design ensures high stability and durability of the module after assembly, and prevents loosening or deformation caused by external forces.

[0051] The lower cover 3's vertical plates are provided with threaded holes, arranged horizontally and located on both sides of the vertical plates. Bolt holes are provided on both sides of the housing 1, and bolts are passed through the bolt holes of the housing 1 to be installed in the threaded holes of the lower cover 3. This structural design enhances the overall strength of the entire device, ensures a reliable connection between the lower cover 3 and the housing 1, and further improves the stability and sealing of the module.

[0052] The coordination of the housing 1, upper cover 2, and lower cover 3 allows for reasonable space to be allocated for each component, facilitating subsequent component installation and integrating various optical functions. This significantly improves manufacturing costs and efficiency, reduces module size, and enhances the reliability of the clamping optical path, facilitating subsequent device integration. The specific arrangement of each component can be referenced to prior art (e.g., patents CN112234423A and CN113363795A) and is not intended to be limiting here.

[0053] A slide slot 63 is provided on the side of the circular platform 62 of the wheel 61. The slide slot 63 is located on the end surface of the circular platform 62 and is used to hold a slide. By adjusting the angle of the slide, the polarization state in the optical path can be fine-tuned, thereby achieving precise control of the mode locking state. This design enables the module to achieve complex optical control through simple rotational adjustment.

[0054] End caps 5 are removably mounted on both sides of the housing 1. A fiber protection sleeve 4 is installed on the end of the end cap 5 away from the housing 1 to protect the optical fiber from external mechanical forces and prevent damage due to excessive bending. This design not only improves the reliability of the optical fiber but also simplifies its installation and maintenance.

[0055] This embodiment also provides a mode locking adjustment fixture for adjusting the nonlinear polarization rotation mode locking module device. Figure 18 As shown, the clamping adjustment fixture includes a fixture base 7, a motor 9 and a worm 8. The motor 9 is mounted on the fixture base 7, the worm 8 is mounted on the output shaft of the motor 9, the housing 1 is mounted on the fixture base 7, and the worm 8 is meshed with the worm wheel 6 (as shown in FIG. Figure 20 shown).

[0056] The clamp base 7 provides stable support for the entire assembly, while the precise meshing of the worm 8 ensures smooth and accurate adjustments. The clamping module can be adjusted and assembled independently using the independent adjustment fixture. The adjustment fixture (including the motor 9) can also be used to test the next clamping module, enabling automatic clamping adjustments without the motor 9.

[0057] like Figure 19 As shown, the base of the fixture 7 has a platform 73 at its bottom, with a mounting hole 71 for the motor 9. Two sides of the platform 73 have recesses 72, and the housing 1 is mounted on the platform 73, with both sides of the housing 1 inserted into the recesses 72. This design of the fixture 7 not only stably secures the clamping module but also enables precise adjustment of the worm gear 6 by driving the worm 8 through the motor 9. The recesses 72 ensure the overall compactness of the device and ease of operation.

[0058] The adjustment fixture is connected to the housing 1 via screws. When powered, the polarization controller motor 9 on the adjustment fixture transmits power via the worm 8 to the worm gear 6 on the clamping module, which in turn rotates. The program searches for the optimal clamping angle for the worm gear 6, which is then secured with glue. Finally, the adjustment fixture is disassembled, and the clamping module's lower cover 3 is screwed to the housing 1. This completes the clamping module assembly without the motor 9. This solves the reliability issue of the clamping optical path and simultaneously removes the polarization controller motor 9, significantly improving manufacturing efficiency, reducing module size, and lowering costs, facilitating subsequent equipment integration.

[0059] Although the above describes the specific implementation methods of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A nonlinear polarization rotation mode-locking module device, characterized in that: include: A housing, an upper cover plate, a lower cover plate and a worm gear, wherein the top of the housing is provided with an upper groove, the bottom is provided with a lower groove, the upper cover plate is installed in the upper groove of the housing, and the lower cover plate is installed in the lower groove of the housing; The bottom of the upper groove of the shell is provided with a first semicircular groove and a first square groove which are perpendicular to each other, and the bottom of the upper cover is provided with a second semicircular groove and a second square groove which are perpendicular to each other; The worm wheel includes a wheel disc and a frustum, the frustum is arranged at both ends of the wheel disc, the frustum is installed in the space surrounded by the first semicircular groove and the second semicircular groove, and a glass slide is installed on the end face of the frustum, and the wheel disc is located in the space surrounded by the first square groove and the second square groove.

2. The nonlinear polarization rotation mode locking module device according to claim 1, characterized in that: The upper groove on the top of the shell is in the shape of a U-shaped character with a downward concave middle. The upper cover plate is inserted into the U-shaped upper groove, and the bottom of the upper cover plate is pressed against the top surface of the upper groove. A boss is formed at the front end of the upper cover plate, and the bottom of the boss is pressed against the top surface of the lower cover plate.

3. The nonlinear polarization rotation mode-locking module device according to claim 2, wherein: The side of the lower cover plate is an L-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located at the bottom of the lower groove of the shell, the vertical plate is embedded in the shell, and the front end surface of the vertical plate is flush with the front end surface of the shell, and the upper cover plate is pressed onto the top surface of the vertical plate of the lower cover plate.

4. The nonlinear polarization rotation mode-locking module device according to claim 3, wherein: There are two first square grooves and two second square grooves, the two first square grooves are arranged in parallel and divide the first semicircular groove into three sections, and the two second square grooves are arranged in parallel and divide the second semicircular groove into three sections.

5. The nonlinear polarization rotation mode-locking module device according to claim 4, wherein: The bottom of the upper groove of the shell is provided with a threaded hole, which is arranged vertically and located between the two first square grooves. The upper cover plate is provided with a bolt hole, and the bolt passes through the bolt hole of the upper cover plate and is installed on the threaded hole of the shell.

6. The nonlinear polarization rotation mode-locking module device according to claim 4, wherein: The vertical plate of the lower cover is provided with threaded holes, which are arranged horizontally and located on both sides of the vertical plate. Bolt holes are provided on both sides of the shell, and the bolts pass through the bolt holes of the shell and are installed on the threaded holes of the lower cover.

7. The nonlinear polarization rotation mode-locking module device according to claim 1, wherein: A glass slide groove is provided on the circular platform on the side of the wheel, and the glass slide groove is provided on the end surface of the circular platform for mounting a glass slide.

8. The nonlinear polarization rotation mode-locking module device according to claim 1, wherein: End caps are installed on both sides of the shell, and the end caps are detachably installed on the shell. An optical fiber protective cover is installed on one end of the end cap away from the shell.

9. A mode locking adjustment fixture for adjusting the nonlinear polarization rotation mode locking module device according to any one of claims 1 to 8, characterized in that: The clamping adjustment fixture includes a fixture base, a motor and a worm. The motor is installed on the fixture base, the worm is installed on the output shaft of the motor, the housing is installed on the fixture base, and the worm is meshed with the worm wheel.

10. The mold clamping adjustment fixture according to claim 9, characterized in that: The bottom of the clamp seat is provided with a carrier, the carrier is provided with a mounting hole for mounting a motor, both sides of the carrier are provided with clearance grooves, the shell is installed on the carrier and both sides of the shell are inserted into the clearance grooves.

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