CN211206998U - Reflective polarization-independent online isolator and optical fiber laser - Google Patents
Reflective polarization-independent online isolator and optical fiber laser Download PDFInfo
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- CN211206998U CN211206998U CN201922379687.5U CN201922379687U CN211206998U CN 211206998 U CN211206998 U CN 211206998U CN 201922379687 U CN201922379687 U CN 201922379687U CN 211206998 U CN211206998 U CN 211206998U
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- 230000010287 polarization Effects 0.000 title claims abstract description 65
- 239000013307 optical fiber Substances 0.000 title description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 68
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model provides a reflection-type polarization-independent online isolator and fiber laser, including first collimater, first polarization beam splitter, first 1/2 wave plate, second polarization beam splitter, optical rotation subassembly, second 1/2 wave plate, third polarization beam splitter, speculum, third 1/2 wave plate, fourth polarization beam splitter and second collimater; the first collimator, the first polarization splitting prism, the first 1/2 wave plate, the second polarization splitting prism, the optical rotation assembly, the second 1/2 wave plate, the third polarization splitting prism and the reflector are sequentially arranged along an output light path; the reflector, the third polarization beam splitter prism, the second 1/2 wave plate, the optical rotation assembly, the second polarization beam splitter prism, the third 1/2 wave plate, the fourth polarization beam splitter prism and the second collimator are sequentially arranged along a reflection light path. The present case adopts polarization beam splitting prism and make full use of device, and effective cost reduces, and reduces whole volume size, does benefit to isolator and fiber laser's miniaturization more.
Description
Technical Field
The utility model relates to an optical isolator field especially relates to a reflection type polarization irrelevant online isolator and fiber laser.
Background
The optical isolator is a directional passive device which allows light to pass in one direction and prevents the light from passing in the opposite direction, and can be used in the fields of optical communication, optical measurement and the like. If the light energy returned from the fiber laser system is strong, the performance of the whole system may be reduced sharply, even the whole system is burnt, so an isolation device of the light path needs to be added in the light path to filter the part of the returned light as much as possible, so as to avoid the influence of the part of the returned light on the laser system and improve the stability of the output of the system.
The existing isolator generally adopts a linear light path, and because output light or return light is transmitted in a single direction, an optical device in the isolator only passes through once and is not optimally used, so that the size of the whole isolator is large, and the cost is high.
SUMMERY OF THE UTILITY MODEL
A first object of the present invention is to provide a reflective polarization independent online isolator with compact structure and low cost.
A second object of the present invention is to provide an optical fiber laser having the above online isolator.
In order to realize the first object of the present invention, the present invention provides a reflective polarization-independent online isolator, which comprises a first collimator, a first polarization beam splitter, a first 1/2 wave plate, a second polarization beam splitter, an optical rotation assembly, a second 1/2 wave plate, a third polarization beam splitter, a reflector, a third 1/2 wave plate, a fourth polarization beam splitter and a second collimator; the first polarization beam splitting prism is provided with a first beam splitting dielectric film and a second beam splitting dielectric film which are parallel to each other, the second polarization beam splitting prism is provided with a third beam splitting dielectric film, the third polarization beam splitting prism is provided with a fourth beam splitting dielectric film and a fifth beam splitting dielectric film which are parallel to each other, and the fourth polarization beam splitting prism is provided with a sixth beam splitting dielectric film and a seventh beam splitting dielectric film which are parallel to each other; the first collimator, the first polarization splitting prism, the first 1/2 wave plate, the second polarization splitting prism, the optical rotation assembly, the second 1/2 wave plate, the third polarization splitting prism and the reflector are sequentially arranged along an output light path; the reflector, the third polarization beam splitter prism, the second 1/2 wave plate, the optical rotation assembly, the second polarization beam splitter prism, the third 1/2 wave plate, the fourth polarization beam splitter prism and the second collimator are sequentially arranged along a reflection light path.
In a further aspect, the output optical path includes a first output optical branch path and a second output optical branch path arranged in parallel; the first light splitting dielectric film, the first 1/2 wave plate, the third light splitting dielectric film, the optical rotation component, the fourth light splitting dielectric film and the reflector are sequentially arranged along the first output light splitting path; the first collimator, the second light splitting dielectric film, the third light splitting dielectric film, the optical rotation assembly, the second 1/2 wave plate and the fifth light splitting dielectric film are sequentially arranged along the second output light splitting path.
Further, the reflection light path comprises a first reflection light splitting path and a second reflection light splitting path which are arranged in parallel; the reflector, the fourth light splitting dielectric film, the optical rotation component, the third light splitting dielectric film and the seventh light splitting dielectric film are sequentially arranged along the first reflection light splitting path; the fifth light splitting dielectric film, the second 1/2 wave plate, the optical rotation component, the third light splitting dielectric film, the third 1/2 wave plate, the sixth light splitting dielectric film and the second collimator are sequentially arranged along the second reflection light splitting path.
In a further aspect, the first, second, third, fourth, fifth, sixth and seventh dichroic dielectric films are parallel to each other.
In a further embodiment, the optical rotation assembly includes a faraday optical rotation element, a magnet and a third 1/2 wave plate, the magnet is located at the periphery of the faraday optical rotation element, the faraday optical rotation element and the third 1/2 wave plate are sequentially arranged along the output optical path, and the third 1/2 wave plate and the faraday optical rotation element are sequentially arranged along the reflection optical path.
In a further embodiment, the optical rotation assembly includes a faraday optical rotation element, a magnet and a third 1/2 wave plate, the magnet is located at the periphery of the faraday optical rotation element, the third 1/2 wave plate and the faraday optical rotation element are sequentially arranged along the output optical path, and the faraday optical rotation element and the third 1/2 wave plate are sequentially arranged along the reflection optical path.
In order to realize the second objective of the present invention, the present invention provides a fiber laser, including the online isolator according to the above-mentioned scheme.
It can be seen from the above scheme that, the Polarization Beam Splitter (PBS) is used as the polarization beam splitter and is plated in a matching way, the cost is relatively low, and a reflective optical path is used, wherein the second PBS, the optical rotation component, the second 1/2 wave plate and the third PBS are multiplexed, especially the optical rotation component comprises the faraday optical rotation component with the largest cost, so that the device is fully utilized, the investment of the device is reduced, the cost is further reduced, and the reflective optical path can further reduce the whole volume, and is more beneficial to the miniaturization of an isolator and an optical fiber laser.
Drawings
Fig. 1 is an optical path diagram of an embodiment of the on-line isolator according to the present invention in a forward transmission state.
Fig. 2 is a light path diagram of the embodiment of the on-line isolator of the present invention when backward light is transmitted.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
In-line isolator embodiment:
referring to fig. 1, the reflective polarization-independent online isolator includes a first collimator 11, a first polarization splitting prism 12, a first 1/2 wave plate 121, a second polarization splitting prism 13, an optical rotation assembly including a faraday rotation element 14, a magnet and a fourth 1/2 wave plate 15, a second 1/2 wave plate 161, a third polarization splitting prism 16, a mirror 17, a third 1/2 wave plate 181, a fourth polarization splitting prism 18 and a second collimator 19, and a magnet (not shown) located at the periphery of the faraday rotation element 14.
The on-line isolator of this case has output light path and reflection light path, as can be seen from fig. 1, output light path from left to right ground, be for export then transmit to speculum 17 from collimator 11, and output light path includes parallel arrangement's first output beam splitting way L1 and second output beam splitting way L2, reflection light path from right to left ground, be for reflecting from speculum 17, input to second polarization beam splitter prism 13 and reflect and transmit to collimator 19, reflection light path includes parallel arrangement's first reflection beam splitting way L3 and second reflection beam splitting way L4.
The first polarization splitting prism 12 is provided with a first splitting dielectric film 21 and a second splitting dielectric film 22 which are parallel to each other, the second polarization splitting prism 13 is provided with a third splitting dielectric film 23, the third polarization splitting prism 16 is provided with a fourth splitting dielectric film 24 and a fifth splitting dielectric film 25 which are parallel to each other, the fourth polarization splitting prism 18 is provided with a sixth splitting dielectric film 26 and a seventh splitting dielectric film 27 which are parallel to each other, and the first splitting dielectric film 21, the second splitting dielectric film 22, the third splitting dielectric film 23, the fourth splitting dielectric film 24, the fifth splitting dielectric film 25, the sixth splitting dielectric film 26 and the seventh splitting dielectric film 27 are parallel to each other.
The first light splitting dielectric film 21, the first 1/2 wave plate 121, the third light splitting dielectric film 23, the faraday rotator 14, the fourth 1/2 wave plate 15, the fourth light splitting dielectric film 24 and the reflector 17 are sequentially arranged along the first output light splitting path L1, and the first collimator 11, the second light splitting dielectric film 22, the third light splitting dielectric film 23, the faraday rotator 14, the fourth 1/2 wave plate 15, the second 1/2 wave plate 161 and the fifth light splitting dielectric film 25 are sequentially arranged along the second output light splitting path L2.
The reflector 17, the fourth light splitting dielectric film 24, the fourth 1/2 wave plate 15, the faraday rotator 14, the third light splitting dielectric film 23 and the seventh light splitting dielectric film 27 are sequentially arranged along the first reflection light splitting path L3, and the fifth light splitting dielectric film 25, the second 1/2 wave plate 161, the fourth 1/2 wave plate 15, the faraday rotator 14, the third light splitting dielectric film 23, the third 1/2 wave plate 181, the sixth light splitting dielectric film 26 and the second collimator 19 are sequentially arranged along the second reflection light splitting path L4.
When light is transmitted in the forward direction, light output from the collimator 11 enters the second light splitting dielectric film 22 and is split into P light and S light, wherein one light beam is reflected to enter the first output light splitting path L1 and is transmitted along the first output light splitting path, the other light beam is transmitted along the second output light splitting path L2, the light is combined by the third polarization light splitting prism 16 after passing through a device on the light path and is input to the reflecting mirror 17, the reflected light enters the fourth light splitting dielectric film 24 after being reflected by the reflecting mirror 17 and is split into P light and S light, wherein one reflected light beam is transmitted along the first reflection light splitting path L3 and is reflected by the third light splitting dielectric film 23 and is output toward the seventh light splitting dielectric film 27, the other reflected light beam is reflected to enter the second reflection light splitting path L4 and is transmitted along the second reflection light splitting dielectric film 354, is reflected by the third light splitting dielectric film 23 and is output toward the sixth light splitting dielectric film 26, and the combined light beam is output to the second collimator 19.
Referring to fig. 2, when returning light is input from the second collimator 19 in return, the returning light enters the sixth spectroscopic dielectric film 26 and is split into P light and S light, and then reflected by the third spectroscopic dielectric film 23, and the rotational polarization state of the optical rotatory element is input to the third polarization splitting prism 16, one of the returning split light is reflected out of the optical path from the fourth spectroscopic dielectric film 24, and the other returning split light is transmitted out of the optical path from the fifth spectroscopic dielectric film 25.
Of course, the above-mentioned embodiments are only preferred embodiments of the present disclosure, and in practical use, the positions of the faraday rotator 14 and the fourth 1/2 wave plate 15 can be changed, so as to achieve the object of the present invention.
Fiber laser example:
the optical fiber laser comprises a seed light source, a beam combiner, a filter and the online isolator.
From top to bottom, adopt polarization beam splitting Prism (PBS) as polarization beam splitting device, and the cooperation is plated, its cost is lower relatively, and utilize reflective light path, wherein multiplexed the second polarization beam splitting prism, optical component, second 1/2 wave plate, third polarization beam splitting prism, especially optical component includes the biggest Faraday optical component of cost, not only make full use of device, reduce the input of device, further with cost reduction, and reflective light path it can further reduce whole volume size, do benefit to isolator and fiber laser's miniaturization more.
Claims (7)
1. A reflective polarization-independent online isolator is characterized by comprising a first collimator, a first polarization beam splitter prism, a first 1/2 wave plate, a second polarization beam splitter prism, an optical rotation assembly, a second 1/2 wave plate, a third polarization beam splitter prism, a reflector, a third 1/2 wave plate, a fourth polarization beam splitter prism and a second collimator;
the first polarization beam splitter prism is provided with a first beam splitting dielectric film and a second beam splitting dielectric film which are parallel to each other, the second polarization beam splitter prism is provided with a third beam splitting dielectric film, the third polarization beam splitter prism is provided with a fourth beam splitting dielectric film and a fifth beam splitting dielectric film which are parallel to each other, and the fourth polarization beam splitter prism is provided with a sixth beam splitting dielectric film and a seventh beam splitting dielectric film which are parallel to each other;
the first collimator, the first polarization splitting prism, the first 1/2 wave plate, the second polarization splitting prism, the optical rotation assembly, the second 1/2 wave plate, the third polarization splitting prism and the reflector are sequentially arranged along an output optical path;
the reflector, the third polarization beam splitter prism, the second 1/2 wave plate, the optical rotation assembly, the second polarization beam splitter prism, the third 1/2 wave plate, the fourth polarization beam splitter prism and the second collimator are sequentially arranged along a reflection light path.
2. The inline isolator of claim 1, wherein:
the output optical path comprises a first output light splitting path and a second output light splitting path which are arranged in parallel;
the first light splitting dielectric film, the first 1/2 wave plate, the third light splitting dielectric film, the optical rotation assembly, the fourth light splitting dielectric film and the reflector are sequentially arranged along the first output light splitting path;
the first collimator, the second light splitting dielectric film, the third light splitting dielectric film, the optical rotation assembly, the second 1/2 wave plate and the fifth light splitting dielectric film are sequentially arranged along the second output light splitting path.
3. The inline isolator of claim 1, wherein:
the reflection light path comprises a first reflection light splitting path and a second reflection light splitting path which are arranged in parallel;
the reflector, the fourth light splitting dielectric film, the optical rotation component, the third light splitting dielectric film and the seventh light splitting dielectric film are sequentially arranged along the first reflection light splitting path;
the fifth light splitting dielectric film, the second 1/2 wave plate, the optical rotation assembly, the third light splitting dielectric film, the third 1/2 wave plate, the sixth light splitting dielectric film and the second collimator are sequentially arranged along the second reflection light splitting path.
4. The inline isolator of claim 1, wherein:
the first light splitting dielectric film, the second light splitting dielectric film, the third light splitting dielectric film, the fourth light splitting dielectric film, the fifth light splitting dielectric film, the sixth light splitting dielectric film and the seventh light splitting dielectric film are parallel to each other.
5. The on-line isolator of any one of claims 1 to 4, wherein:
the optical rotation subassembly includes Faraday rotation optical element, magnet and fourth 1/2 wave plate, the magnet is located Faraday rotation optical element's periphery, Faraday rotation optical element with fourth 1/2 wave plate follow output optical path arranges in proper order, fourth 1/2 wave plate with Faraday rotation optical element follows reflection optical path arranges in proper order.
6. The on-line isolator of any one of claims 1 to 4, wherein:
the optical rotation subassembly includes Faraday optical rotation piece, magnet and fourth 1/2 wave plate, the magnet is located Faraday optical rotation piece's periphery, fourth 1/2 wave plate with Faraday optical rotation piece follows output optical path arranges in proper order, Faraday optical rotation piece with the fourth 1/2 wave plate is followed reflection optical path arranges in proper order.
7. A fibre laser comprising an in-line isolator as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922379687.5U CN211206998U (en) | 2019-12-25 | 2019-12-25 | Reflective polarization-independent online isolator and optical fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922379687.5U CN211206998U (en) | 2019-12-25 | 2019-12-25 | Reflective polarization-independent online isolator and optical fiber laser |
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| CN211206998U true CN211206998U (en) | 2020-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885231A (en) * | 2021-09-13 | 2022-01-04 | 珠海光库科技股份有限公司 | Optical isolator |
| WO2024007749A1 (en) * | 2022-07-07 | 2024-01-11 | 华为技术有限公司 | Optical system, display device, and vehicle |
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2019
- 2019-12-25 CN CN201922379687.5U patent/CN211206998U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885231A (en) * | 2021-09-13 | 2022-01-04 | 珠海光库科技股份有限公司 | Optical isolator |
| WO2024007749A1 (en) * | 2022-07-07 | 2024-01-11 | 华为技术有限公司 | Optical system, display device, and vehicle |
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