CN217386016U - Polarization axis alignment device and polarization axis alignment system - Google Patents
Polarization axis alignment device and polarization axis alignment system Download PDFInfo
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- CN217386016U CN217386016U CN202221247819.4U CN202221247819U CN217386016U CN 217386016 U CN217386016 U CN 217386016U CN 202221247819 U CN202221247819 U CN 202221247819U CN 217386016 U CN217386016 U CN 217386016U
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Abstract
The utility model relates to a laser technical field discloses a polarization axis aligning device and polarization axis alignment system. The polarizer seat is arranged at the first end of the through hole, the protection plate is arranged at the second end of the through hole, a first installation position is arranged on one side, close to the protection plate, of the polarizer seat, and the polarizer is installed at the first installation position; the polarization splitting prism is arranged on the inner wall of the through hole and is positioned between the polarizing film and the protective plate, so that the polarizing film and the polarization splitting prism are arranged on the polarization splitting lens seat, the polarization axis aligning device is simple in structure, the processing technology is simplified, the assembly is convenient, and meanwhile, the relative positions of the polarizing film and the polarization splitting prism are convenient to position, and the debugging is convenient. The central lines of the first light through hole, the polaroid, the polarization splitting prism and the second light through hole are all on the same horizontal line, so that the light beam can sequentially penetrate through the first light through hole, the polaroid, the polarization splitting prism and the second light through hole, and the polarization main shaft of the optical fiber is debugged.
Description
Technical Field
The utility model relates to a laser technical field especially relates to a polarization axis aligning device and polarization axis alignment system.
Background
Polarization maintaining optical fibers are a special type of optical fiber that is widely used in polarization-related applications. The polarization maintaining optical fiber has the advantages of multi-directional direction, linear polarization maintaining capability and the like, can ensure that the linear polarization direction is unchanged, and improves the coherent signal-to-noise ratio so as to realize high-precision measurement of physical quantity. The alignment of the principal axes of polarization of the fiber is critical to allow transmission of the input polarization state without distortion.
In the prior art, the alignment device of the optical fiber polarization main shaft comprises a polarizing film and a polarization splitting prism, but the polarizing film and the polarization splitting prism are two modules, the two independent modules are complex to process, the polarizing film and the polarization splitting prism are difficult to debug in alignment, the error is large, and only coarse adjustment can be performed.
Accordingly, a polarization axis alignment apparatus and a polarization axis alignment system are needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Based on above, an object of the utility model is to provide a polarization axis aligning device and polarization axis alignment system, simple structure simplifies processing technology, and it is convenient to assemble, is convenient for fix a position polaroid and polarization splitting prism's relative position, the debugging of being convenient for.
In order to achieve the purpose, the utility model adopts the following technical proposal:
in one aspect, there is provided a polarization axis aligning apparatus, including:
the polarization beam splitter base is provided with a through hole along a first direction;
the polarizer seat is arranged at the first end of the through hole, the protection plate is arranged at the second end of the through hole, the polarizer seat is provided with a first light through hole along the first direction, and the protection plate is provided with a second light through hole along the first direction;
the polarizer seat is provided with a first installation position close to one side of the protection plate, and the polarizer is installed at the first installation position;
a polarization splitting prism installed on an inner wall of the through hole and located between the polarizing plate and the protective plate;
the central lines of the first light through hole, the polaroid, the polarization splitting prism and the second light through hole are all on the same horizontal line.
As a preferred technical solution of the polarization axis alignment device, a third light passing hole and a fourth light passing hole are disposed on two sides of the polarization splitting prism along the second direction, and both the third light passing hole and the fourth light passing hole are located on the side wall of the polarization splitting prism seat.
As a preferred technical solution of the polarization axis alignment apparatus, the third light passing hole and/or the fourth light passing hole are/is provided with a first optical power detector.
As a preferred technical scheme of a polarization axis aligning device, the first end of through-hole is provided with the internal thread, the polarizer seat is provided with the external screw thread, polarizer seat threaded connection in the internal thread.
As a preferred technical scheme of the polarization axis aligning device, a plurality of threaded holes are arranged in the circumferential direction of the internal thread, and a screw is in threaded connection with the threaded holes, and the end of the screw abuts against the outer wall of the polarization plate seat.
As a preferred technical solution of the polarization axis alignment apparatus, the outer wall of the polarizer base is provided with a first positioning step, and the first positioning step can abut against the end face of the first end of the polarization splitting mirror base.
As a preferred technical solution of the polarization axis alignment apparatus, the outer wall of the protection plate is provided with a second positioning step, the protection plate extends into the second end of the through hole, and the second positioning step abuts against the end face of the second end of the polarization splitting mirror base.
As an optimal technical scheme of a polarization axis aligning device, the first installation position is a positioning groove, the first light-passing hole is communicated with the bottom of the positioning groove, a positioning surface is arranged at the bottom of the positioning groove, and the polaroid is abutted to the positioning surface when being installed in the positioning groove.
As a preferable technical solution of the polarization axis alignment device, the extinction ratio of the polarizer is not less than 1000: 1; the extinction ratio of the polarization beam splitter prism is not less than 1000: 1.
on the other hand, the polarization axis alignment system comprises a dual-frequency laser, an optical fiber coupling device, a multimode optical fiber and any one of the polarization axis alignment devices, wherein the dual-frequency laser, the polarization axis alignment device, the optical fiber coupling device and the multimode optical fiber are sequentially arranged, and a second optical power detection piece is arranged at the output end of the polarization axis alignment device.
The utility model has the advantages that:
the utility model provides a polarization axis aligning device, wherein, a polarizer seat is arranged at the first end of a through hole, a protection plate is arranged at the second end of the through hole, one side of the polarizer seat, which is close to the protection plate, is provided with a first installation position, and a polarizer is arranged at the first installation position; polarization beam splitting prism installs on the inner wall of through-hole, and is located between polaroid and the protection shield, has realized that polaroid and polarization beam splitting prism all install on polarization beam splitting mirror seat, and relative prior art's components of a whole that can function independently structure, this polarization axis aligning device simple structure simplifies processing technology, and it is convenient to assemble, simultaneously, is convenient for fix a position polaroid and polarization beam splitting prism's relative position, the debugging of being convenient for. The polarizer seat is provided with a first light through hole along a first direction, and the protection plate is provided with a second light through hole along the first direction; the central lines of the first light through hole, the polaroid, the polarization splitting prism and the second light through hole are all on the same horizontal line, so that the light beam can sequentially penetrate through the first light through hole, the polaroid, the polarization splitting prism and the second light through hole, and the polarization main shaft of the optical fiber is debugged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is an exploded view of a polarization axis alignment apparatus according to an embodiment of the present invention;
fig. 2 is a top cross-sectional view of a polarization axis alignment apparatus according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a polarizer holder according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a polarization axis alignment system according to an embodiment of the present invention.
The figures are labeled as follows:
10. a dual-frequency laser; 20. a polarization axis alignment device; 30. an optical fiber coupling device; 40. a multimode optical fiber;
1. a polarization beam splitter base; 11. a through hole; 12. a third light passing hole; 13. a fourth light passing hole; 14. a threaded hole; 15. mounting a step;
2. a polarizer holder; 21. a first light passing hole; 22. a first positioning step; 23. positioning a groove; 231. a positioning surface;
3. a protection plate; 31. a second light passing hole; 32. a second positioning step;
4. a polarizing plate; 5. polarization beam splitting prism.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1 to 3, the present embodiment provides a polarization axis alignment apparatus including a polarization splitting mirror mount 1, a polarizer mount 2, a protective plate 3, a polarizing plate 4, and a polarization splitting prism 5.
Specifically, the polarization splitting mirror base 1 is provided with a through hole 11 along a first direction; the polarizer base 2 is arranged at the first end of the through hole 11, the protection plate 3 is arranged at the second end of the through hole 11, the polarizer base 2 is provided with a first light through hole 21 along the first direction, and the protection plate 3 is provided with a second light through hole 31 along the first direction; a first installation position is arranged on one side of the polarizer seat 2 close to the protection plate 3, and the polarizer 4 is installed at the first installation position; the polarization splitting prism 5 is arranged on the inner wall of the through hole 11 and is positioned between the polaroid 4 and the protection plate 3; the central lines of the first light through hole 21, the polarizing plate 4, the polarization splitting prism 5 and the second light through hole 31 are all on the same horizontal line. In the embodiment, the polarizing film 4 and the polarization splitting prism 5 are both arranged on the polarization splitting mirror base 1, compared with the split structure in the prior art, the polarization axis aligning device is simple in structure, more convenient and fast to fix and install, the processing technology is simplified, and meanwhile, the relative positions of the polarizing film 4 and the polarization splitting prism 5 are convenient to position, and debugging is facilitated. Furthermore, the central lines of the first light through hole 21, the polarizing plate 4, the polarization splitting prism 5 and the second light through hole 31 are all on the same horizontal line, so that the light beam can sequentially penetrate through the first light through hole 21, the polarizing plate 4, the polarization splitting prism 5 and the second light through hole 31, and the polarization main shaft of the optical fiber is debugged. In other embodiments, the polarization axis alignment device can also be used in the reverse direction, and the light beam passes through the second light passing hole 31, the polarization splitting prism 5, the polarizer 4 and the first light passing hole 21 in sequence, and the reverse direction can also be used as a polarization splitting system with high extinction ratio, so as to reduce the influence of stray light and polarization aliasing.
Preferably, the bottom wall of the through hole 11 is provided with an installation step 15, when the polarizer 4 and the polarization splitting prism 5 are assembled, the protection plate 3 is firstly detached, then the polarizer 4 is installed at the first installation position, then the polarization splitting prism 5 is installed on the installation step 15, and finally the protection plate 3 is installed to prevent the polarization splitting prism 5 from falling off. In this embodiment, after the polarization splitting prism 5 is installed on the installation step 15, the polarization splitting prism 5 is adhered to the installation step 15 by using an ultraviolet adhesive, so as to improve the installation stability of the polarization splitting prism 5.
Further, the first end of through-hole 11 is provided with the internal thread, and polarizer seat 2 is provided with the external screw thread, and polarizer seat 2 threaded connection is in the internal thread. When debugging the polarization main shaft, need debug the rotation angle of polaroid 4, the polaroid seat 2 rotates through the relative through-hole 11 of screw thread, and then drives polaroid 4 and rotates, carries out the angle modulation, and threaded connection can finely tune when having realized polaroid 4 angle debugging, improves polaroid 4's debugging precision.
Further preferably, a plurality of threaded holes 14 are circumferentially arranged on the internal thread, and the screw is screwed in the threaded holes 14 and the end part of the screw abuts against the outer wall of the polarizer holder 2. When the polarizer 4 needs to be debugged, the screw is unscrewed so that the polarizer base 2 can rotate; when polaroid 4 removed to the demand position, screw up the screw, screw tip butt in the outer wall of polaroid seat 2 prevents that polaroid seat 2 from rotating relative polarization beam splitting prism 5, has improved the reliability of equipment during operation.
The polarization axis alignment means is adapted so that only a horizontal beam is emitted after the light source has entered the polarizer 4. Preferably, the polarization splitting prism 5 is provided with a third light passing hole 12 and a fourth light passing hole 13 on two sides along the second direction, and both the third light passing hole 12 and the fourth light passing hole 13 are located on the side wall of the polarization splitting mirror base 1. In the fine adjustment process of the polarizer 4, the light exiting the polarizer 4 inevitably has both the light in the horizontal direction and the light in other non-horizontal directions, and the third through hole 11 and the fourth through hole 11 can facilitate the light beam exiting in the non-horizontal direction, so as to prevent the light beam in the non-horizontal direction from interfering with the light beam in the horizontal direction, thereby affecting the alignment effect.
In this embodiment, the first direction is an X direction, the second direction is a Y direction, and the X direction and the Y direction are perpendicular to each other.
In the prior art, the polarization main axis is aligned by the naked eye and machining, and small deviation still exists in the alignment of the polarization axis, so that the transmission distortion of the polarization state of the light beam is caused. In this embodiment, the third light passing hole 12 and/or the fourth light passing hole 13 are provided with a first optical power detector. First light power detection piece can be with the light power of non-horizontal direction light beam, and when the detected value of first light power detection piece was minimum or zero, fixed polarization piece seat 2 this moment can obtain that only horizontal direction's light beam jets out behind the light source input polaroid 4, accomplishes the debugging, and through the mode that first light power detection piece measured, the debugging precision is higher. In other embodiments, the first optical power meter may be disposed at the second through hole 11, and when the detection value of the first optical power meter is the maximum value, the polarizer holder 2 is fixed at this time, and it is proved that the optical power of the light beam in the horizontal direction is strongest, so that only the light beam in the horizontal direction is emitted after the light source is input into the polarizer 4.
Preferably, the outer wall of polarizer seat 2 is provided with first location step 22, and first location step 22 can the butt in the terminal surface of the first end of polarization splitting microscope seat 1, prevents that polarizer seat 2 from installing too deeply, has improved the installation accuracy of polaroid 4, makes things convenient for manually operation.
In this embodiment, the first installation position is the positioning groove 23, the first light passing hole 21 communicates with the bottom of the positioning groove 23, the bottom of the positioning groove 23 is provided with the positioning surface 231, and when the polarizer 4 is installed in the positioning groove 23, the polarizer 4 abuts against the positioning surface 231, so that the installation accuracy of the polarizer 4 is improved. In this embodiment, after the polarizer 4 is mounted in the positioning groove 23, the polarizer 4 is fixed on the positioning groove 23 by using an ultraviolet adhesive to prevent the polarizer 4 from separating from the positioning groove 23.
Further, the outer wall of the protection plate 3 is provided with a second positioning step 32, the part of the protection plate 3 extends into the second end of the through hole 11, and the second positioning step 32 abuts against the end face of the second end of the polarization splitting lens base 1, so that the protection plate 3 is prevented from being installed too deeply, the installation precision of the protection plate 3 is improved, and the manual operation is facilitated.
Further, in the present embodiment, the extinction ratio of the polarizing plate 4 is not less than 1000: 1; the extinction ratio of the polarization splitting prism 5 is not less than 1000: 1.
as shown in fig. 4, this embodiment further provides a polarization axis alignment system, which includes a dual-frequency laser 10, an optical fiber coupling device 30, a multimode optical fiber 40, and the polarization axis alignment device 20, where the dual-frequency laser 10, the polarization axis alignment device 20, the optical fiber coupling device 30, and the multimode optical fiber 40 are sequentially disposed, and an output end of the polarization axis alignment device 20 is provided with a second optical power detector. The second optical power detector can detect the optical power of the light beam emitted from the output end of the polarization axis alignment device 20, adjust the posture of the polarization axis alignment device 20, allow the laser beam to pass through the center of the light through hole of the polarization axis alignment device 20, and fix the polarization axis alignment device 20 when the second optical power detector is the maximum value. The attitude of the optical fiber coupling device 30 is then adjusted so that the light beam passes through the center of the light passing hole of the optical fiber coupling device 30. The fiber coupling device 30 is terminated with a multimode optical fiber 40. The optical power meter detects the light component at the output end of the multimode fiber 40 and rotates the fiber coupling device 30 so that the light component at the output end measured by the optical power meter is maximum, i.e. the polarization axis of the fiber coupling device 30 is aligned.
In this embodiment, the first optical power detector and the second optical power detector may be optical power meters.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A polarization axis alignment device, comprising:
the polarization beam splitter base (1) is provided with a through hole (11) along a first direction;
the polarizer base (2) is mounted at a first end of the through hole (11), the protection plate (3) is mounted at a second end of the through hole (11), the polarizer base (2) is provided with a first light through hole (21) along the first direction, and the protection plate (3) is provided with a second light through hole (31) along the first direction;
the polarizer seat (2) is provided with a first installation position close to one side of the protection plate (3), and the polarizer (4) is installed at the first installation position;
a polarization splitting prism (5) which is installed on the inner wall of the through hole (11) and is positioned between the polarizing plate (4) and the protection plate (3);
the central lines of the first light through hole (21), the polaroid (4), the polarization splitting prism (5) and the second light through hole (31) are all on the same horizontal line.
2. The polarization axis alignment device according to claim 1, wherein a third light passing hole (12) and a fourth light passing hole (13) are disposed on two sides of the polarization splitting prism (5) along the second direction, and the third light passing hole (12) and the fourth light passing hole (13) are both disposed on the side wall of the polarization splitting prism base (1).
3. The polarization axis alignment device according to claim 2, wherein the third light passing hole (12) and/or the fourth light passing hole (13) is provided with a first optical power detector.
4. The polarization axis aligning apparatus of claim 1, wherein the first end of the through hole (11) is provided with an internal thread, the polarizer holder (2) is provided with an external thread, and the polarizer holder (2) is screwed to the internal thread.
5. The polarization axis alignment device according to claim 4, wherein the internal thread is circumferentially provided with a plurality of threaded holes (14), and a screw is screwed in the threaded hole (14) and abuts against the outer wall of the polarizer holder (2) at the end part.
6. The polarization axis alignment device according to claim 1, wherein the outer wall of the polarizer holder (2) is provided with a first positioning step (22), and the first positioning step (22) can abut against the end face of the first end of the polarization splitting mirror holder (1).
7. The polarization axis alignment device according to claim 1, wherein the outer wall of the protection plate (3) is provided with a second positioning step (32), the protection plate (3) partially protrudes into the second end of the through hole (11) and the second positioning step (32) abuts against the end face of the second end of the polarization splitting mirror holder (1).
8. The polarization axis alignment device according to claim 1, wherein the first mounting position is a positioning groove (23), the first light passing hole (21) communicates with a bottom of the positioning groove (23), the bottom of the positioning groove (23) is provided with a positioning surface (231), and when the polarizer (4) is mounted in the positioning groove (23), the polarizer (4) abuts against the positioning surface (231).
9. The polarization axis alignment device according to any one of claims 1 to 8, wherein the extinction ratio of the polarizing plate (4) is not less than 1000: 1; the extinction ratio of the polarization beam splitter prism (5) is not less than 1000: 1.
10. polarization axis alignment system, comprising a dual-frequency laser (10), a fiber coupling device (30), a multimode fiber (40) and a polarization axis alignment device according to any of claims 1 to 9, the dual-frequency laser (10), the polarization axis alignment device, the fiber coupling device (30) and the multimode fiber (40) being arranged in sequence, the output of the polarization axis alignment device being provided with a second optical power detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221247819.4U CN217386016U (en) | 2022-05-23 | 2022-05-23 | Polarization axis alignment device and polarization axis alignment system |
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| CN202221247819.4U CN217386016U (en) | 2022-05-23 | 2022-05-23 | Polarization axis alignment device and polarization axis alignment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224572A (en) * | 2023-05-09 | 2023-06-06 | 中国人民解放军63921部队 | Polarizing plate polarization direction alignment system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224572A (en) * | 2023-05-09 | 2023-06-06 | 中国人民解放军63921部队 | Polarizing plate polarization direction alignment system and method |
| CN116224572B (en) * | 2023-05-09 | 2023-08-22 | 中国人民解放军63921部队 | Polarizing plate polarization direction alignment system and method |
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Denomination of utility model: A polarization axis alignment device and polarization axis alignment system Effective date of registration: 20231213 Granted publication date: 20220906 Pledgee: Industrial Bank Co.,Ltd. Shanghai Hongkou sub branch Pledgor: Shanghai Yinguan Semiconductor Technology Co.,Ltd. Registration number: Y2023310000848 |