CN106501948B - Double-channel optical rotary coupler - Google Patents
Double-channel optical rotary coupler Download PDFInfo
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- CN106501948B CN106501948B CN201611241579.6A CN201611241579A CN106501948B CN 106501948 B CN106501948 B CN 106501948B CN 201611241579 A CN201611241579 A CN 201611241579A CN 106501948 B CN106501948 B CN 106501948B
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- light
- collimated light
- mode
- lens
- coupler
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00172—Optical arrangements with means for scanning
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
Abstract
The invention discloses a double-channel optical rotary coupler, which comprises a rotating shaft and a rotor rotating around the rotating shaft, wherein the coupler is provided with a static end which is static relative to a world coordinate system and a movable end which rotates around the rotating shaft relative to the world coordinate system; a beam splitter rotating with the rotor around the rotation axis, a third collimating lens, a reflecting mirror, a third converging lens and a fourth converging lens. The coupler overcomes the defects of the prior art, and realizes that two paths of single-mode optical signals can be simultaneously rotationally coupled in the same coupler.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a dual-channel optical rotary coupler.
Background
An optical rotary coupler or optical rotary connector is a device widely used in industrial and medical fiber laser scanning endoscopes. The optical rotary coupler has the main function of realizing single-mode coupling between two sections of optical fibers, wherein one section of optical fiber is static, and the other section of optical fiber rotates around an optical axis at a high speed. The single mode fiber rotating at high speed can realize circular scanning in the laser scanning endoscope.
The dual-channel optical rotary coupler is characterized in that a static end which is static is provided with two single-mode optical fibers 1 and 2, and as shown in figure 1, each single-mode optical fiber transmits an independent single-mode optical signal; the rotating movable end is also provided with two single-mode fibers 3 and 4, and the single-mode fibers 3 and 4 rotate around the same rotating shaft at a high speed; during the rotation, single-mode light 3 continuously receives the optical signal emitted from single-mode fiber 1, single-mode light 4 continuously receives the optical signal emitted from single-mode fiber 2, and the optical power coupling efficiency of channels 1-3 and channels 2-4 is optimal (> 80%). Because two optical fibers at the movable end cannot be placed on the rotating shaft at the same time, the dual-channel optical rotary coupling is a difficult problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a dual-channel optical rotary coupler which is simple in structure and can realize simultaneous rotary coupling of two paths of single-mode optical signals in the same coupler.
In order to achieve the purpose, the invention adopts the technical scheme that: a dual channel optical rotary coupler, the coupler including an axis of rotation and a rotor rotating about the axis of rotation, the coupler having a stationary end that is stationary relative to a world coordinate system, a movable end that rotates about the axis of rotation relative to the world coordinate system, the coupler including first and second optical fibers located on the stationary end, third and fourth optical fibers located on the movable end, the coupler further comprising:
the first collimating lens is positioned on a light emitting path of the first optical fiber, and the first optical fiber is collimated by the first collimating lens to form first single-mode collimated light;
the second collimating lens is positioned on the light emitting path of the second optical fiber, and the second optical fiber is collimated by the second collimating lens to form second single-mode collimated light;
the first converging lens is positioned on the light outgoing path of the first single-mode collimated light and is used for focusing the first single-mode collimated light;
the beam combiner is positioned on the light emitting path of the second single-mode collimated light, and a first reflecting film is plated at a focus spot formed by the first single-mode collimated light after being focused by the first focusing lens on the beam combiner;
the part of the second single-mode collimated light which penetrates through the beam combiner and the part of the first single-mode collimated light which is reflected by the first reflecting film form a coaxial light beam;
a second converging lens positioned on the light exit path of the coaxial light beam for focusing the second single-mode collimated light in the coaxial light beam;
the beam splitter is used for splitting the coaxial light beams, and a second reflecting film is plated at a focus spot formed by focusing the second single-mode collimated light in the coaxial light beams by the second converging lens;
after the first single-mode collimated light in the coaxial light beam passes through the second converging lens, the part of the light beam penetrating through the beam splitter is focused by a third converging lens and then is coupled into a third optical fiber; after the second single-mode collimated light in the coaxial light beam passes through the second converging lens and the beam splitter, the part reflected by the second reflecting film on the beam splitter sequentially passes through a third collimating lens, a reflector and a fourth converging lens and then is coupled to enter a fourth optical fiber;
the first collimating lens, the second collimating lens, the beam combiner, the first converging lens and the second converging lens are static relative to the rotating shaft; the beam splitter, the third collimating lens, the reflecting mirror, the third converging lens and the fourth converging lens rotate around the rotating shaft along with the rotor.
Preferably, the second single-mode collimated light and the first single-mode collimated light form an included angle of 90 degrees; the surface of the beam combiner forms an included angle of 45 degrees with the axial lead direction of the rotating shaft, and the rotating shaft penetrates through the center of the beam combiner along the axial lead direction of the rotating shaft; the surface where the beam splitter is located and the axial lead direction of the rotating shaft form an included angle of 135 degrees, and the rotating shaft penetrates through the center of the beam splitter along the axial lead direction of the rotating shaft.
Further preferably, the first reflection film is located at the center of the beam combiner, and the area of the first reflection film corresponds to the area of a focal spot formed by focusing the first single-mode collimated light through the first focusing lens.
Further preferably, the second reflection film is located at the center of the beam splitter, and the area of the second reflection film corresponds to the area of a focal spot formed by focusing the second single-mode collimated light through the second condensing lens.
Further preferably, the beam combiner is a transparent optical flat plate or window.
Further preferably, the beam splitter is a transparent optical flat plate or window.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the double-channel optical rotary coupler, the beam combiner, the beam splitter and the lenses are adopted, so that two paths of single-mode optical signals can be simultaneously and rotationally coupled around the rotating shaft, the double-channel optical rotary coupler is provided, the structure is simple, the operation is convenient, and the problems in the prior art are effectively solved.
Drawings
FIG. 1 is a schematic structural diagram of a dual-channel optical rotary coupler according to the present invention;
wherein: 1. a first optical fiber; 2. a second optical fiber; 3. a third optical fiber; 4. a fourth optical fiber; 5. a first single-mode collimated light; 6. a second single-mode collimated light;
10. a rotating shaft; 11. a rotor; 12. a first collimating lens; 13. a second collimating lens; 14. a first condensing lens; 15. a beam combiner; 151. a first reflective film; 16. a second condenser lens; 17. a beam splitter; 171. a second reflective film; 18. a third collimating lens; 19. a mirror; 20. a third condensing lens; 21. a fourth converging lens.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1, a dual channel optical rotary coupler includes a rotary shaft 10 and a rotor 11 rotating around the rotary shaft 10, the coupler has a stationary end which is stationary with respect to a world coordinate system, a movable end which rotates around the rotary shaft 10 with respect to the world coordinate system, the coupler includes a first optical fiber 1 and a second optical fiber 2 on the stationary end, and a third optical fiber 3 and a fourth optical fiber 4 on the movable end. The third optical fiber 3 and the fourth optical fiber 4 rotate around the rotation axis 10 at any speed, and there is no relative movement between the third optical fiber 3 and the fourth optical fiber 4.
Here, the coupler further includes a first collimating lens 12, a second collimating lens 13, a beam combiner 15, a first condensing lens 14, a second condensing lens 16, which are stationary with respect to the rotation axis 10; a beam splitter 17, a third collimator lens 18, a mirror 19, a third condenser lens 20, a fourth condenser lens 21, which rotate with the rotor 11 about the rotation axis 10.
Specifically, the first collimating lens 12 and the second collimating lens 13 are respectively located on the light emitting paths of the first optical fiber 1 and the second optical fiber 2, the first optical fiber 1 is collimated by the first collimating lens 12 to form first single-mode collimated light 5, and the second optical fiber 2 is collimated by the second collimating lens 13 to form second single-mode collimated light 6. In this example, the first and second single-mode collimated lights 5 and 6 form an angle of 90 °.
The first focusing lens 14 is located on an outgoing path of the first single-mode collimated light 5, and is used for focusing the first single-mode collimated light 5.
The combiner 15 is located on the light exit path of the second single-mode collimated light 6, in this example, the plane where the combiner 15 is located and the axial direction of the rotating shaft 10 form an included angle of 45 degrees, and the rotating shaft 10 penetrates through the center of the combiner 15 along the axial direction of the rotating shaft 10. A first reflective film 151 is coated on the beam combiner 15 at a focal spot formed by the first single-mode collimated light 5 focused by the first focusing lens 14, in this example, the first reflective film 151 is located at the center of the beam combiner 15, and the area of the first reflective film 151 corresponds to the area of the focal spot formed by the first single-mode collimated light 5 focused by the first focusing lens 14 (generally, about 100 square microns). When the second single-mode collimated light 6 passes through the beam combiner 15, the first single-mode collimated light 5 can only be reflected by the first reflective film 151 when passing through the beam combiner 15, except that the first reflective film 151 at the center of the beam combiner 15 cannot pass through the beam combiner. Thus, the part of the second single-mode collimated light 6 that is transmitted through the beam combiner 15 and the part of the first single-mode collimated light 5 that is reflected by the first reflection film 151 form a coaxial light beam.
The second focusing lens 16 is located in the exit path of the coaxial beam for focusing the second single-mode collimated light 6 in the coaxial beam.
A beam splitter 17 for splitting the coaxial light beam. In this example, the surface on which the beam splitter 17 is located makes an angle of 135 ° with the axial direction of the rotating shaft 10, and the rotating shaft 10 passes through the center of the beam splitter 17 in the axial direction thereof. A second reflection film 171 is coated on the beam splitter 17 at a focal spot formed by the second single-mode collimated light 6 in the coaxial light beam after being focused by the second converging lens 16, in this example, the second reflection film 171 is located at the center of the beam splitter 17, and the area of the second reflection film 171 corresponds to the area of the focal spot formed by the second single-mode collimated light 6 after being focused by the second converging lens 16 (generally, about 100 square microns).
After passing through the second converging lens 16, the first single-mode collimated light 5 in the coaxial light beam is focused by the third converging lens 20, and then is coupled into the third optical fiber 3; after passing through the second converging lens 16, the second single-mode collimated light 6 in the coaxial light beam is reflected by the second reflective film 171 on the beam splitter 17, and then the reflected part sequentially passes through the third collimating lens 18, the reflecting mirror 19 and the fourth converging lens 21 and is coupled into the fourth optical fiber 4.
In this example, the beam combiner 15 employs a transparent optical plate or window, and the beam splitter 17 also employs a transparent optical plate or window.
In summary, the coupler in this embodiment overcomes the defects of the prior art by using the beam combiner 15, the beam splitter 17 and the plurality of lenses, and realizes that two single-mode optical signals can be simultaneously rotationally coupled in the same coupler.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. A dual channel optical rotary coupler, the coupler comprising an axis of rotation and a rotor rotating about the axis of rotation, the coupler having a stationary end that is stationary relative to a world coordinate system, a movable end that rotates about the axis of rotation relative to the world coordinate system, the coupler comprising first and second optical fibers on the stationary end, third and fourth optical fibers on the movable end, the coupler further comprising:
the first collimating lens is positioned on a light emitting path of the first optical fiber, and the first optical fiber is collimated by the first collimating lens to form first single-mode collimated light;
the second collimating lens is positioned on the light emitting path of the second optical fiber, and the second optical fiber is collimated by the second collimating lens to form second single-mode collimated light;
the first converging lens is positioned on the light outgoing path of the first single-mode collimated light and is used for focusing the first single-mode collimated light;
the beam combiner is positioned on a light emitting path of the second single-mode collimated light, and a first reflecting film is plated at a focus spot formed by the first single-mode collimated light after being focused by the first focusing lens on the beam combiner;
the part of the second single-mode collimated light which penetrates through the beam combiner and the part of the first single-mode collimated light which is reflected by the first reflecting film form a coaxial light beam;
a second converging lens positioned on the light exit path of the coaxial light beam for focusing the second single-mode collimated light in the coaxial light beam;
the beam splitter is used for splitting the coaxial light beams, and a second reflecting film is plated at a focus spot formed by focusing the second single-mode collimated light in the coaxial light beams by the second converging lens;
after the first single-mode collimated light in the coaxial light beam passes through the second converging lens, the part of the light beam penetrating through the beam splitter is focused by a third converging lens and then is coupled into a third optical fiber; after the second single-mode collimated light in the coaxial light beam passes through the second converging lens and the beam splitter, the part reflected by the second reflecting film on the beam splitter sequentially passes through a third collimating lens, a reflector and a fourth converging lens and then is coupled to enter a fourth optical fiber;
the first collimating lens, the second collimating lens, the beam combiner, the first converging lens and the second converging lens are static relative to the rotating shaft; the beam splitter, the third collimating lens, the reflecting mirror, the third converging lens and the fourth converging lens rotate around the rotating shaft along with the rotor.
2. The dual-channel optical rotary coupler of claim 1, wherein the second single-mode collimated light is at a 90 ° angle to the first single-mode collimated light; the surface of the beam combiner forms an included angle of 45 degrees with the axial lead direction of the rotating shaft, and the rotating shaft penetrates through the center of the beam combiner along the axial lead direction of the rotating shaft; the plane of the beam splitter and the axial lead direction of the rotating shaft form a 135-degree included angle, and the rotating shaft penetrates through the center of the beam splitter along the self axial lead direction.
3. The dual-channel optical rotary coupler of claim 2, wherein the first reflective film is located at the center of the beam combiner, and the area of the first reflective film corresponds to the area of a focal spot formed by the first single-mode collimated light focused by the first focusing lens.
4. The dual-channel optical rotary coupler of claim 2, wherein the second reflective film is centered on the beam splitter and has an area corresponding to a focal spot area formed by the second single-mode collimated light focused by the second converging lens.
5. The dual channel optical rotary coupler of any of claims 1 to 4, wherein the beam combiner is a transparent optical plate or window.
6. The dual channel optical rotary coupler of any of claims 1 to 4, wherein the beam splitter is a transparent optical plate or window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611241579.6A CN106501948B (en) | 2016-12-29 | 2016-12-29 | Double-channel optical rotary coupler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611241579.6A CN106501948B (en) | 2016-12-29 | 2016-12-29 | Double-channel optical rotary coupler |
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| CN106501948A CN106501948A (en) | 2017-03-15 |
| CN106501948B true CN106501948B (en) | 2022-07-22 |
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| CN110575142A (en) * | 2019-09-16 | 2019-12-17 | 南京波斯泰克光电科技有限公司 | Multi-beam optical coherence tomography instrument of single spectrometer |
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| JP3947275B2 (en) * | 1997-08-28 | 2007-07-18 | オリンパス株式会社 | Endoscope |
| ATE391451T1 (en) * | 1998-01-26 | 2008-04-15 | Massachusetts Inst Technology | ENDOSCOPE FOR CAPTURE FLUORESCENCE IMAGES |
| AT411411B (en) * | 2002-05-17 | 2003-12-29 | Femtolasers Produktions Gmbh | SHORT-PULSE LASER DEVICE WITH PREFERRED PASSIVE MODE COUPLING AND MULTIPLE REFLECTION TELESCOPE FOR IT |
| CA2390072C (en) * | 2002-06-28 | 2018-02-27 | Adrian Gh Podoleanu | Optical mapping apparatus with adjustable depth resolution and multiple functionality |
| CN200982952Y (en) * | 2006-12-05 | 2007-11-28 | 华南师范大学 | Dual-channel optical fiber refractive index sensor |
| JP2009153862A (en) * | 2007-12-27 | 2009-07-16 | Olympus Medical Systems Corp | Endoscope washing and disinfecting apparatus |
| CN101270975B (en) * | 2008-05-16 | 2010-12-22 | 湖南大学 | Combined interference device for aspheric surface measurement |
| CN101477198B (en) * | 2009-01-14 | 2012-06-13 | 中国科学院上海光学精密机械研究所 | Universal optical antenna of synthetic aperture laser imaging radar |
| JP5639182B2 (en) * | 2009-11-02 | 2014-12-10 | オリンパス株式会社 | Beam splitter device, light source device, and scanning observation device |
| US10022042B2 (en) * | 2011-10-28 | 2018-07-17 | Massachusetts Eye & Ear Infirmary | Tissue and cellular imaging |
| CN206282038U (en) * | 2016-12-29 | 2017-06-27 | 苏州塞罗尔医学影像科技有限公司 | A kind of dual channel optical rotary coupler |
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