CN105511121A - Photoisolator - Google Patents
Photoisolator Download PDFInfo
- Publication number
- CN105511121A CN105511121A CN201610072874.7A CN201610072874A CN105511121A CN 105511121 A CN105511121 A CN 105511121A CN 201610072874 A CN201610072874 A CN 201610072874A CN 105511121 A CN105511121 A CN 105511121A
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- light splitting
- diaphragm
- light
- splitting device
- optoisolator
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
Abstract
The invention provides a photoisolator. A first polarization beam splitting device, an optical rotation device and a second polarization beam splitting device are arranged on the photoisolator along a light path direction; a first diaphragm is arranged between the first polarization beam splitting device and the second polarization beam splitting device on the photoisolator; the first diaphragm comprises a first barrier part which is arranged between a first beam splitting optical path and a second beam splitting optical path of the first polarization beam splitting device; a barrier part of the diaphragm is arranged between the first beam splitting optical path and the second beam splitting optical path; and return light with a certain angle is blocked through the barrier part. Through ingenious arrangement of the barrier part, the return light with a variable angle is effectively blocked under the condition of not influencing normal use, and thus the optical isolation performance of the photoisolator is effectively improved.
Description
Technical field
The present invention relates to optical technical field, particularly relate to a kind of optoisolator.
Background technology
In high powered laser system, in order to prevent the steady running affecting laser instrument in back light retrieval system from even destroying laser instrument internal component, often need add optoisolator, light can only unidirectionally be passed through.
But, existing optoisolator is by being provided with optically-active device and light splitting device, when there being strong reflection to return, light is made to be back in laser instrument in former road by the cooperation of optically-active device and light splitting device, although optoisolator effectively can isolate reflected light, prevent its return laser light device inner, but when reflected light is not that Yan Yuanlu returns, return in inclination certain angle, light path after optically-active device and light splitting device is offset, will to a certain extent in reflect back into laser, it will cause laser instrument to damage, the maintenance charge making high powered laser system need to enclose great number is used, increase use cost.
Summary of the invention
The object of this invention is to provide a kind of optoisolator with good light isolation performance.
In order to realize object of the present invention, the invention provides a kind of optoisolator, optical path direction is provided with the first light splitting device, optically-active device and the second light splitting device, wherein, optoisolator is provided with the first diaphragm between the first light splitting device and the second light splitting device, and the first diaphragm comprises the first stop part be arranged between the first light splitting optical path of the first light splitting device and the second light splitting optical path of the first light splitting device.
From such scheme, due to light splitting device and optically-active device with the use of under, the light that former road returns is after light splitting device and optically-active device, light path skew can not be there is, the light returned can not incide in collimating apparatus and then also can not turn back in laser instrument, but when there is the back light reflection with certain angle, its return light path just there will be change, position between the first light splitting optical path and the second light splitting optical path is provided with the stop part of diaphragm, by stop part, back light is stopped, when not affecting normal use, the ingenious position of stop part stops the back light of indefinite angle effectively, effectively improve the light isolation performance of optoisolator.
Further scheme is, the first diaphragm is provided with the first transmittance section and the second transmittance section, and the first light splitting optical path is through the first transmittance section, and the second light splitting optical path is through the second transmittance section.
Therefore in order to further improve light isolation performance, arranging diaphragm in larger area, and arranging transmittance section respectively for light splitting optical path, make the laser exported can export from transmittance section, the light returned all is stopped by the diaphragm outside stop part and transmittance section.
Further scheme is, the first diaphragm is arranged in the first light splitting device, optically-active device or the second light splitting device.
Therefore, diaphragm except separate type be arranged on except between light splitting device, diaphragm can also snugly be connected in light splitting device.
Further scheme is, optically-active device comprises faraday rotator, and the first light splitting optical path and the second light splitting optical path are through faraday rotator.
Further scheme is, optically-active device also comprises the wave plate be arranged between the first light splitting device and faraday rotator.
Further scheme is, optically-active device also comprises the wave plate be arranged between the second light splitting device and faraday rotator.
Further scheme is, the first diaphragm is arranged on wave plate or faraday rotator.
Therefore, optically-active device by wave plate and faraday rotator as the cooperation of magnetic rotation crystal, its setting position can rotate as required, polarisation of light state is effectively made to rotate by optically-active device, thus effectively improve light isolation, and the setting position of diaphragm all can carry out multiple choices according to actual conditions.
Further scheme is, optoisolator also comprises the second diaphragm being arranged on the first light splitting device prime, and the second diaphragm comprises the 3rd transmittance section, and the input path of the first light splitting device is through the 3rd transmittance section.
Further scheme is, the second diaphragm comprises the second stop part, and the second stop part is arranged on the 3rd printing opacity periphery.
Further scheme is, optoisolator also comprises the 3rd diaphragm being arranged on the second light splitting device rear class, 3rd diaphragm comprises the 4th transmittance section and the 3rd stop part, and the output light path of the second light splitting device is through the 4th transmittance section, and the 3rd stop part is arranged on the 4th printing opacity periphery.
Therefore, the second diaphragm is arranged on the rear class of collimating apparatus, and by the rear class arranging the second light splitting device of the 3rd diaphragm, can stops and absorb most of back light, further improve light isolation.
Accompanying drawing explanation
Fig. 1 is the light output schematic diagram of optoisolator first embodiment of the present invention.
Fig. 2 is that the first light of optoisolator first embodiment of the present invention returns schematic diagram.
Fig. 3 is that the second light of optoisolator first embodiment of the present invention returns schematic diagram.
Fig. 4 is the light output schematic diagram of optoisolator second embodiment of the present invention.
Fig. 5 is the structural drawing of optoisolator in optoisolator second embodiment of the present invention.
Fig. 6 is the light output schematic diagram of optoisolator of the present invention 3rd embodiment.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
Optoisolator first embodiment:
With reference to Fig. 1, Fig. 1 is the light output schematic diagram of optoisolator, optoisolator is provided with optical fiber 11, collimating apparatus 12, diaphragm 13, light splitting device 14, diaphragm 15, wave plate 16, magnetic rotation crystal 17, light splitting device 18 and diaphragm 19 along optical path direction, one end of optical fiber 11 is connected with collimating apparatus 12, the other end of optical fiber 11 is connected with laser instrument, after the resonator cavity Output of laser of laser instrument through Optical Fiber Transmission to collimating apparatus 12, then through collimating apparatus 12 along output light path collimation export.
Diaphragm 13 is provided with transmittance section at middle part, and diaphragm 13 is provided with stop part on the position of periphery, transmittance section, and the output light path of collimating apparatus 12 passes the transmittance section of diaphragm 13.Laser through diaphragm 13 incides light splitting device 14, namely the input path of light splitting device 14 is through diaphragm 13 transmittance section, light splitting device 14 comprises the Amici prism be made by analyzing crystal etc., as wollaston prism or Rochon prism etc., also can be the analyzing crystal directly prepared by birefringece crystal, light splitting device 14 carries out beam splitting to the polarization state of free laser or closes bundle exporting, orthogonal first divided beams of output polarization state and the second divided beams after laser incident polarization light-dividing device 14, first divided beams transmits along the first light splitting optical path, second divided beams transmits along the second light splitting optical path.
Optically-active device comprises wave plate 16 and faraday rotator in the present embodiment, faraday rotator adopts magnetic rotation crystal 17, first divided beams and the second divided beams are subsequently successively through wave plate 16 and magnetic rotation crystal 17, the divided beams of linearly polarized light is after wave plate 16 and magnetic rotation crystal 17, and rotation adjustment is carried out in the polarization direction of wave plate 16 and magnetic rotation crystal 17 pairs of divided beams.Subsequently from the first divided beams through optically-active adjustment and the second divided beams incident polarization light-dividing device 18 of the output of optically-active device, light splitting device 18 carries out conjunction bundle to the first divided beams and the second divided beams, outside laser after finally closing bundle to output to along the output light path of light splitting device 18 through diaphragm 19, diaphragm 19 is provided with transmittance section at middle part, and diaphragm 19 is provided with stop part on the position of periphery, transmittance section, the output light path of light splitting device 18 passes the transmittance section of diaphragm 19.
Diaphragm 15 is arranged between the first light splitting optical path of light splitting device 14 and the second light splitting optical path of light splitting device 14, namely diaphragm 15 is arranged between the first divided beams and the second divided beams, preferably, diaphragm 15 comprises stop part, the stop part of diaphragm 15 between light splitting optical path in arranging with being covered with, and be respectively arranged with transmittance section in the upper end of diaphragm 15 and bottom, first divided beams just passes in the transmittance section of diaphragm 15 upper end, and the second divided beams just passes in the transmittance section of diaphragm 15 bottom.
With reference to Fig. 2, Fig. 2 is that the first light of optoisolator returns schematic diagram, when there being back light to return along former road, after back light incident polarization light-dividing device 18, be divided into two bundle polarization states vertical return divided beams outgoing, two return divided beams successively through magnetic rotation crystal 17 and wave plate 16 subsequently, light splitting device 14 is incided after the optically-active effect of magnetic rotation crystal 17 and wave plate 16, be positioned at first of upper end return divided beams adjustment polarization state after do not occur refraction and linearly return output, first return divided beams and be irradiated on the stop part of diaphragm 13 subsequently, be positioned at second of lower end return divided beams adjustment polarization state after occur refraction after and export, second return divided beams and be irradiated on the stop part of diaphragm 13 subsequently, the visible back light returned along former road is after the light process of light splitting device and optically-active device, its back light does not all turn back in collimating apparatus 12.
With reference to Fig. 3, Fig. 3 is that the second light of optoisolator returns schematic diagram, when have back light with original optical path in a certain angle be back into firing angle return time, make back light successively after light splitting device 18, magnetic rotation crystal 17, wave plate 16 and light splitting device 14, first returns divided beams and second returns divided beams light path inclination and offset all occurs, now, first returns divided beams is radiated on the stop part of diaphragm 15 after inclination and offset, then effectively stop that the incident collimating apparatus 12, the first of back light returns divided beams and is irradiated to after inclination and offset on diaphragm 13.
Optoisolator second embodiment:
With reference to the light output schematic diagram that Fig. 4 and Fig. 5, Fig. 4 are optoisolator second embodiments, Fig. 5 is the structural drawing of diaphragm 20.Under same principle based on above-mentioned optoisolator first embodiment, optoisolator second embodiment is improved diaphragm 20, diaphragm 20 is arrange in relatively large area compared to diaphragm 15, diaphragm 20 is provided with two transmittance sections 22, first light splitting optical path of light splitting device 14 and the second light splitting optical path, on position between transmittance section 22, diaphragm 20 is provided with stop part 21, and on the position of stop part 21 between the first light splitting optical path and the second light splitting optical path.When the back light returned along former road is incident, returning divided beams will through transmittance section 22, but due under point light action of light splitting device 14, making to return divided beams will be irradiated on diaphragm 13, when back light with original optical path in a certain angle be back into firing angle return time, the back light of inclination then cannot pass transmittance section 22, and part returns divided beams and is irradiated on stop part 21, back light will be stopped by diaphragm 20, effectively prevent back light from inciding collimating apparatus 12.
Optoisolator the 3rd embodiment:
With reference to the light output schematic diagram that Fig. 6, Fig. 6 are optoisolator of the present invention 3rd embodiments.On the basis of above-described embodiment, the quantity being arranged on the first diaphragm between light splitting device can also for multiple, optoisolator as shown in Figure 6 the 3rd embodiment also comprises the mutually isostructural diaphragm 23 with diaphragm 20, diaphragm 23 is arranged between magnetic rotation crystal 17 and polarization light-dividing device 18, to realize object of the present invention equally, also to be arranged between wave plate 16 and magnetic rotation crystal 17 by another first diaphragm, it is also to realize object of the present invention.
Therefore, due to light splitting device and optically-active device with the use of under, the light that former road returns is after light splitting device and optically-active device, light path skew can not be there is, the light returned can not incide in collimating apparatus and then also can not turn back in laser instrument, but when there is the back light reflection with certain angle, its return light path just there will be change, position between the first light splitting optical path and the second light splitting optical path is provided with the stop part of diaphragm, by stop part, back light is stopped, when not affecting normal use, the ingenious position of stop part stops the back light of indefinite angle effectively, effectively improve the light isolation performance of optoisolator.
Above-described embodiment is preferred embodiment of the present invention, more change can be had when practical application, as the second diaphragm between light splitting device 14 and light splitting device 18, except being arranged on except between light splitting device 14 and wave plate 16, still other are arranged between light splitting device 14 and light splitting device 18 on optional position, and be arranged on light splitting device 14 with adopting attaching mode, wave plate 16, on the surface of magnetic rotation crystal 17 or light splitting device 18, as long as the stop part of diaphragm is arranged between two light splitting optical paths and just can realizes object of the present invention.And change wave plate 16 and the position both magnetic rotation crystal 17, that gyrotropi crystal and wave plate set gradually along optical path direction, the side near light splitting device 14 is arranged on by magnetic rotation crystal 17, wave plate 16 is arranged on the side near light splitting device 18, according to the handling principle of optically-active, be to realize object of the present invention equally.Simultaneously, optically-active device of the present invention can also adopt other gyrotropi crystal, such as quartz crystal replaces wave plate to carry out optically-active process to light beam together with magnetic rotation crystal, and above-described embodiment collimating apparatus is removed, only adopt the combination of polarization light-dividing device and optically-active device, light directly exports polarization light-dividing device, and these changes are also to realize object of the present invention.
Claims (10)
1. optoisolator, is provided with the first light splitting device, optically-active device and the second light splitting device along optical path direction;
It is characterized in that:
Described optoisolator is provided with the first diaphragm between described first light splitting device and described second light splitting device, and described first diaphragm comprises the first stop part between the first light splitting optical path and the second light splitting optical path of described first light splitting device being arranged on described first light splitting device.
2. optoisolator according to claim 1, is characterized in that:
Described first diaphragm is provided with the first transmittance section and described second transmittance section, and described first light splitting optical path is through described first transmittance section, and described second light splitting optical path is through described second transmittance section.
3. optoisolator according to claim 1 and 2, is characterized in that:
Described first diaphragm is arranged in described first light splitting device, described optically-active device or described second light splitting device.
4. optoisolator according to claim 1, is characterized in that:
Described optically-active device comprises faraday rotator, and described first light splitting optical path and described second light splitting optical path are through described faraday rotator.
5. optoisolator according to claim 4, is characterized in that:
Described optically-active device also comprises the wave plate be arranged between described first light splitting device and described faraday rotator.
6. optoisolator according to claim 4, is characterized in that:
Described optically-active device also comprises the wave plate be arranged between described second light splitting device and described faraday rotator.
7. the optoisolator according to claim 5 or 6, is characterized in that:
Described first diaphragm is arranged on described wave plate or described faraday rotator.
8. the optoisolator according to any one of claim 2,4,5,6, is characterized in that:
Described optoisolator also comprises the second diaphragm being arranged on described first light splitting device prime, and described second diaphragm comprises the 3rd transmittance section, and the input path of described first light splitting device is through described 3rd transmittance section.
9. optoisolator according to claim 8, is characterized in that:
Described second diaphragm comprises the second stop part, and described second stop part is arranged on described 3rd printing opacity periphery.
10. the optoisolator according to any one of claim 2,4,5,6, is characterized in that:
Described optoisolator also comprises the 3rd diaphragm being arranged on described second light splitting device rear class, described 3rd diaphragm comprises the 4th transmittance section and the 3rd stop part, the output light path of described second light splitting device is through described 4th transmittance section, and described 3rd stop part is arranged on described 4th printing opacity periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072874.7A CN105511121B (en) | 2016-02-02 | 2016-02-02 | Optoisolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072874.7A CN105511121B (en) | 2016-02-02 | 2016-02-02 | Optoisolator |
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| Publication Number | Publication Date |
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| CN105511121A true CN105511121A (en) | 2016-04-20 |
| CN105511121B CN105511121B (en) | 2018-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610072874.7A Active CN105511121B (en) | 2016-02-02 | 2016-02-02 | Optoisolator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353855A (en) * | 2016-11-14 | 2017-01-25 | 福建福晶科技股份有限公司 | Optical isolator at high isolation degree |
| CN108020887A (en) * | 2016-11-04 | 2018-05-11 | 珠海光库科技股份有限公司 | Fibre optic isolater and its compensation of refractive index method |
| CN108345131A (en) * | 2018-03-15 | 2018-07-31 | 中国科学技术大学 | A kind of faraday isolator device |
| CN113155040A (en) * | 2021-03-04 | 2021-07-23 | 上海精测半导体技术有限公司 | Device and method for detecting angle change of reflected light beam and film thickness measuring device |
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| JPH04204712A (en) * | 1990-11-30 | 1992-07-27 | Mitsubishi Kasei Corp | Optical isolator |
| JPH0540243A (en) * | 1991-08-06 | 1993-02-19 | Fuji Elelctrochem Co Ltd | Optical isolator |
| CN1365011A (en) * | 2000-07-14 | 2002-08-21 | Jds尤尼费斯公司 | Beam splitter and beam combiner with isolated polarized beam |
| CN102798989A (en) * | 2012-08-30 | 2012-11-28 | 深圳市艾格莱光电科技有限公司 | Faraday optical rotation method and device, and optical isolation method and device using Faraday optical rotation device |
| CN103913857A (en) * | 2014-04-01 | 2014-07-09 | 深圳市艾格莱光电科技有限公司 | Optical isolation method and optical isolation device |
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2016
- 2016-02-02 CN CN201610072874.7A patent/CN105511121B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04204712A (en) * | 1990-11-30 | 1992-07-27 | Mitsubishi Kasei Corp | Optical isolator |
| JPH0540243A (en) * | 1991-08-06 | 1993-02-19 | Fuji Elelctrochem Co Ltd | Optical isolator |
| CN1365011A (en) * | 2000-07-14 | 2002-08-21 | Jds尤尼费斯公司 | Beam splitter and beam combiner with isolated polarized beam |
| CN102798989A (en) * | 2012-08-30 | 2012-11-28 | 深圳市艾格莱光电科技有限公司 | Faraday optical rotation method and device, and optical isolation method and device using Faraday optical rotation device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020887A (en) * | 2016-11-04 | 2018-05-11 | 珠海光库科技股份有限公司 | Fibre optic isolater and its compensation of refractive index method |
| CN108020887B (en) * | 2016-11-04 | 2020-05-29 | 珠海光库科技股份有限公司 | Optical fiber isolator and refractive index compensation method thereof |
| CN106353855A (en) * | 2016-11-14 | 2017-01-25 | 福建福晶科技股份有限公司 | Optical isolator at high isolation degree |
| CN108345131A (en) * | 2018-03-15 | 2018-07-31 | 中国科学技术大学 | A kind of faraday isolator device |
| CN108345131B (en) * | 2018-03-15 | 2023-10-20 | 中国科学技术大学 | Faraday isolator device |
| CN113155040A (en) * | 2021-03-04 | 2021-07-23 | 上海精测半导体技术有限公司 | Device and method for detecting angle change of reflected light beam and film thickness measuring device |
| CN113155040B (en) * | 2021-03-04 | 2023-02-28 | 上海精测半导体技术有限公司 | Device and method for detecting angle change of reflected light beam and film thickness measuring device |
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| CN105511121B (en) | 2018-01-26 |
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