CN220381315U - Reflective optical isolator - Google Patents
Reflective optical isolator Download PDFInfo
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- CN220381315U CN220381315U CN202321965294.2U CN202321965294U CN220381315U CN 220381315 U CN220381315 U CN 220381315U CN 202321965294 U CN202321965294 U CN 202321965294U CN 220381315 U CN220381315 U CN 220381315U
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- birefringent crystal
- beam splitting
- light path
- splitting
- wave plate
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- 230000003287 optical effect Effects 0.000 title claims abstract description 80
- 239000013078 crystal Substances 0.000 claims abstract description 72
- 230000010287 polarization Effects 0.000 claims description 12
- 229910009372 YVO4 Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000002955 isolation Methods 0.000 description 3
- 238000009795 derivation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
Abstract
The utility model provides a reflective optical isolator, comprising: the optical device comprises a first collimator, a first birefringent crystal, a first beam splitting cube, a Faraday optical rotation piece, an optical rotation 1/2 wave plate, a second beam splitting cube and a reflecting film which are sequentially arranged along the direction of an output light path, wherein the second collimator, the second birefringent crystal and the first beam splitting cube are sequentially arranged along the direction of a reflecting light path, and a third collimator, the third birefringent crystal and the second beam splitting cube which are sequentially arranged along the direction of a return light path.
Description
Technical Field
The utility model relates to the field of optical devices, in particular to a reflective optical isolator.
Background
An optical isolator is a directional optical passive device which allows light to pass in one direction and prevents light from passing in the opposite direction, and in a fiber laser system, if stronger reverse light exists in the system, the system is easy to be unstable, the performance is reduced, and even the whole system is burnt. Therefore, an isolator needs to be added into the system to play a role in protection.
The scheme of the existing optical isolator comprises a transmission type two-stage isolator, which is generally of a linear type design, and is connected in series through two isolation systems to achieve the effect of double isolation, and the transmission type two-stage isolator is characterized in that an optical path is a straight-through type, an optical device in the optical path is only used once, the optimal use is not achieved, the whole device is large in size, and the cost is high.
Another prior art optical isolator design includes a reflective dual-stage isolator, which uses a polarizing beam splitter Prism (PBS) as a polarizing beam splitter crystal, and uses a high reflectivity high reflection sheet to fold the optical path, and multiplexes the optical components. The structure is compact, and the cost is reduced compared with a transmission type double-stage isolator while the double-stage isolation effect is achieved. But the high reflection sheet is adopted as an optical piece with a reflection function, the requirements on the horizontal angle and the vertical angle of the high reflection sheet are higher during debugging, and the debugging difficulty is high. And the polarization splitting prism design can not collect and process the reverse light, the reverse light is consumed in the device, the device is easy to burn out, and the reverse light bearing power is not high.
Disclosure of Invention
The utility model aims to provide a reflective optical isolator which is compact in structure and has reverse light guiding.
In order to achieve the object of the present utility model, the present utility model provides a reflective optical isolator comprising: the optical system comprises a first collimator, a first birefringent crystal, a first beam splitting cube, a Faraday optical rotation piece, an optical rotation 1/2 wave plate, a second beam splitting cube and a reflecting film, wherein the first collimator, the first birefringent crystal, the first beam splitting cube, the Faraday optical rotation piece, the optical rotation 1/2 wave plate, the second beam splitting cube and the reflecting film are sequentially arranged along the direction of an output light path, the reflecting film is plated on the end face of the tail end of the second beam splitting cube, the first birefringent crystal is provided with a second beam splitting light path and a first beam splitting light path, the first 1/2 wave plate is arranged between the first collimator and the first birefringent crystal, the first beam splitting light path passes through the first 1/2 wave plate, the first beam splitting cube is provided with a first beam splitting medium film, the second beam splitting cube is provided with a second beam splitting medium film, and the first beam splitting medium film is perpendicular to the second beam splitting medium film; the second collimator, the second birefringent crystal and the first beam splitting cube are sequentially arranged along the direction of the reflection light path, the direction of the reflection light path is perpendicular to the direction of the output light path, the second birefringent crystal is provided with a third beam splitting light path and a fourth beam splitting light path, a second 1/2 wave plate is arranged between the second collimator and the second birefringent crystal, the fourth beam splitting light path passes through the second 1/2 wave plate, and the first birefringent crystal and the second birefringent crystal are respectively positioned at two sides of the first beam splitting medium film; the third collimator, the third birefringent crystal and the second beam splitting cube are sequentially arranged along the direction of the light return path, the direction of the light return path is perpendicular to the direction of the output light path, the third birefringent crystal is provided with a fifth beam splitting light path and a sixth beam splitting light path, a third 1/2 wave plate is arranged between the third collimator and the third birefringent crystal, the sixth beam splitting light path passes through the third 1/2 wave plate, and the optical rotation 1/2 wave plate and the third birefringent crystal are both positioned on the same side of the second beam splitting medium film.
Still further, the first birefringent crystal, the second birefringent crystal and/or the third birefringent crystal are made of YVO4 material.
Still further, the first beam splitting cube and/or the second beam splitting cube employ a PBS polarizing prism.
In a further scheme, the first 1/2 wave plate is attached to the end face of the first birefringent crystal.
In a further scheme, the second 1/2 wave plate is attached to the end face of the second birefringent crystal.
In a further scheme, a third 1/2 wave plate is attached to the end face of the third birefringent crystal.
The utility model has the beneficial effects that the scheme directly coats the reflecting film on the end face of the tail end of the second beam splitting cube, so that the debugging difficulty is reduced, the reflecting light path structure is compact, the optical device multiplexing brings the advantage of low cost, and in addition, the reverse light is led out from the third collimator by arranging the light-guiding-out light path of the reverse light in the direction of the light-returning light path, so that the reverse light bearing capacity of the device is improved.
Drawings
Fig. 1 is a diagram of the optical path of an embodiment of an optical isolator of the present utility model during forward transmission.
Fig. 2 is a diagram of the optical path of an embodiment of the optical isolator of the present utility model during reverse transmission.
The utility model is further described below with reference to the drawings and examples.
Detailed Description
Referring to fig. 1 and 2, the reflective optical isolator includes a first collimator 11, a first birefringent crystal 12, a first beam splitting cube 13, a faraday rotator 14, an optically active 1/2 wave plate 15, a second beam splitting cube 16, and a reflective film 21 sequentially arranged in an output optical path direction X, the reflective film 21 is plated on a distal end face of the second beam splitting cube 16, the distal end face of the second beam splitting cube 16 is an end face located at a distal end of the output optical path direction X, a magnet (not shown) is provided on an outer periphery of the faraday rotator 14, the first birefringent crystal 12 has a second beam splitting optical path L2 and a first beam splitting optical path L1, a first 1/2 wave plate 121 is provided between the first collimator 11 and the first birefringent crystal 12, the first beam splitting optical path L1 passes through the first 1/2 wave plate 121, the first 1/2 wave plate 121 is mounted on an end face of the first birefringent crystal 12, the first beam splitting cube 13 is provided with a first beam splitting medium film 131, the second beam splitting cube 16 is provided with a second beam splitting medium film 161, and the first beam splitting medium film 161 is perpendicular to the first beam splitting medium film 161.
In addition, the optical isolator further includes a second collimator 18, a second birefringent crystal 17, and a first beam splitting cube 13 sequentially arranged along a reflected optical path direction Y1, the reflected optical path direction Y1 is perpendicular to the output optical path direction X, the second birefringent crystal 17 has a third beam splitting optical path L3 and a fourth beam splitting optical path L4, a second 1/2 wave plate 171 is disposed between the second collimator 18 and the second birefringent crystal 17, the fourth beam splitting optical path L4 passes through the second 1/2 wave plate 171, the second 1/2 wave plate 171 is attached to an end face of the second birefringent crystal 17, and the first birefringent crystal 12 and the second birefringent crystal 17 are located on both sides of the first beam splitting dielectric film 131, respectively.
Furthermore, the optical isolator further comprises a third collimator 20, a third birefringent crystal 19 and a second beam splitting cube 16 which are sequentially arranged along a return light path direction Y2, the return light path direction Y2 is perpendicular to the output light path direction X, the third birefringent crystal 19 is provided with a fifth beam splitting optical path L5 and a sixth beam splitting optical path L6, a third 1/2 wave plate 191 is arranged between the third collimator 20 and the third birefringent crystal 19, the sixth beam splitting optical path L6 passes through the third 1/2 wave plate 191, the third 1/2 wave plate 191 is attached to the end face of the third birefringent crystal 19, and the optical rotation 1/2 wave plate 15 and the third birefringent crystal 19 are located on the same side of the second beam splitting medium film 161.
The first birefringent crystal 12, the second birefringent crystal 17 and the third birefringent crystal 19 are made of YVO4 material, and the first beam splitting cube 13 and the second beam splitting cube 16 are PBS polarizing prisms.
Referring to fig. 1, when the light outputted from the first collimator 11 enters the first birefringent crystal 12 while being forward transmitted in the output optical path direction X, the light is split into O light and E light by the birefringent crystal, the O light is polarized horizontally, the E light is polarized vertically, the E light is transmitted along the first beam splitting optical path L1, the O light is transmitted along the second beam splitting optical path L2, the E light of the L1 optical path passes through the first 1/2 wave plate 121, the polarization state is changed from the vertical state to the horizontal state, the E light is transmitted along the L1 optical path, passes through the first beam splitting cube 13, keeps the output original optical path direction, passes through the faraday rotator 14 and the optical rotation 1/2 wave plate 15, and then forward rotates by 0 ° while the polarization state keeps the horizontal state, and outputs to the reflective film 21 through the second beam splitting cube 16.
The reflected light is firstly output in the light path direction X, then transmitted along the light path direction Y1, passes through the second beam splitting cube 16, reaches the Faraday rotator 14 and the optical rotation 1/2 wave plate 15, is reversely rotated by 90 degrees, changes the polarization state from the horizontal state to the vertical state, reaches the first beam splitting cube 13, is reflected to the third beam splitting light path L3 at the first beam splitting medium film 21, and is transmitted through the second birefringent crystal 17 to reach the second collimator 18.
The O light of the L2 light path is output from the first birefringent crystal 12, passes through the first beam splitting cube 13, keeps transmission in the direction of the output light path, passes through the Faraday rotator 14 and the optical rotation 1/2 wave plate 15, and is forward rotated by 0 degrees, the polarization state keeps horizontal output, passes through the second beam splitting cube 16, reaches the reflecting film 21, and passes through the second beam splitting cube 16, reaches the Faraday rotator 14 and the optical rotation 1/2 wave plate 15, is reverse rotated by 90 degrees, and the polarization state is changed from the horizontal state to the vertical state, reaches the first beam splitting cube 13, is reflected to the second reflection beam splitting light path L4 at the first beam splitting medium film 21, is changed from the vertical state to the horizontal state through the second 1/2 wave plate 171, and is combined to reach the second collimator 18 through the second birefringent crystal 17, so that the normal output of the forward light is realized.
Referring to fig. 2, when the return light is sequentially transmitted in the reflected light path direction Y1, the output light path direction X, and the return light path direction Y2, the light output from the second collimator 18 is input to the second birefringent crystal 17, the light is split into O light and E light by the birefringent crystal, the O light polarization state is horizontal, the E light polarization state is vertical, wherein the E light is transmitted along the first output light splitting optical path L3, the O light is transmitted along the second output light splitting optical path L4, the E light of the L3 optical path is output from the second birefringent crystal 17, passes through the first light splitting cube 13, is reflected at the first light splitting dielectric film 21, passes through the faraday rotator 14 and the optical rotation 1/2 wave plate 15, the forward rotation is 0 ° and the polarization state is kept in the vertical state, the light reflected at the second light splitting dielectric film 22 to the first light splitting optical path L5, the E light path enters the third birefringent crystal 19, and the combined light reaches the third collimator 20.
The O light of the L4 optical path is output from the second birefringent crystal 17, passes through the second 1/2 wave plate 171, changes the polarization state from the horizontal state to the vertical state, enters the first beam splitting cube 13, is reflected at the first beam splitting dielectric film 21, passes through the optical rotation component 14, rotates forward by 0 ° and keeps the vertical state for output, passes through the second beam splitting cube 16, and is reflected at the second beam splitting dielectric film 22 to the second return beam splitting optical path L6, the light of the L6 optical path passes through the third 1/2 wave plate 191, changes the polarization state from the vertical state to the horizontal state, enters the third birefringent crystal 19, and reaches the third collimator 20, thereby realizing the derivation of the return light.
From the above, this scheme is through directly plating the reflectance coating at the terminal end face of second beam splitting cube, reduces the debugging degree of difficulty then, and reflective light path compact structure, and optics multiplexing brings the advantage of low cost, in addition through setting up the derivation light path of reverse light in the light return light path direction, reverse light is derived from the third collimator, improves device reverse light bearing capacity.
Claims (6)
1. A reflective optical isolator comprising:
the optical system comprises a first collimator, a first birefringent crystal, a first beam-splitting cube, a Faraday optical rotation piece, an optical rotation 1/2 wave plate, a second beam-splitting cube and a reflecting film, wherein the first collimator, the first birefringent crystal, the first beam-splitting cube, the Faraday optical rotation piece, the optical rotation 1/2 wave plate, the second beam-splitting cube and the reflecting film are sequentially arranged along the direction of an output light path, the reflecting film is plated on the end face of the end of the second beam-splitting cube, the first birefringent crystal is provided with a second beam-splitting light path and a first beam-splitting light path, the first 1/2 wave plate is arranged between the first collimator and the first birefringent crystal, the first beam-splitting light path passes through the first 1/2 wave plate, the first beam-splitting cube is provided with a first beam-splitting medium film, and the second beam-splitting cube is provided with a second beam-splitting medium film, and the first beam-splitting medium film is perpendicular to the second beam-splitting medium film;
the second collimator, the second birefringent crystal and the first beam splitting cube are sequentially arranged along the direction of a reflection light path, the direction of the reflection light path is perpendicular to the direction of the output light path, the second birefringent crystal is provided with a third beam splitting light path and a fourth beam splitting light path, a second 1/2 wave plate is arranged between the second collimator and the second birefringent crystal, the fourth beam splitting light path passes through the second 1/2 wave plate, and the first birefringent crystal and the second birefringent crystal are respectively positioned at two sides of the first beam splitting medium film;
the light splitting device comprises a first collimator, a first birefringent crystal and a first beam splitting cube, wherein the first collimator, the first birefringent crystal and the first beam splitting cube are sequentially arranged along the light returning light path direction, the light returning light path direction is perpendicular to the output light path direction, the first birefringent crystal is provided with a first beam splitting light path and a first beam splitting light path, a first 1/2 wave plate is arranged between the first collimator and the first birefringent crystal, the first beam splitting light path passes through the first 1/2 wave plate, and the optical rotation 1/2 wave plate and the first birefringent crystal are both positioned on the same side of a first beam splitting medium film.
2. The optical isolator of claim 1, wherein:
the first birefringent crystal, the second birefringent crystal and/or the third birefringent crystal are made of YVO4 material.
3. The optical isolator of claim 1, wherein:
the first beam splitting cube and/or the second beam splitting cube adopts a PBS polarization beam splitting prism.
4. An optical isolator as claimed in any one of claims 1 to 3, wherein:
the first 1/2 wave plate is attached to the end face of the first birefringent crystal.
5. An optical isolator as claimed in any one of claims 1 to 3, wherein:
the second 1/2 wave plate is attached to the end face of the second birefringent crystal.
6. An optical isolator as claimed in any one of claims 1 to 3, wherein:
the third 1/2 wave plate is attached to the end face of the third birefringent crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321965294.2U CN220381315U (en) | 2023-07-24 | 2023-07-24 | Reflective optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321965294.2U CN220381315U (en) | 2023-07-24 | 2023-07-24 | Reflective optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220381315U true CN220381315U (en) | 2024-01-23 |
Family
ID=89571191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321965294.2U Active CN220381315U (en) | 2023-07-24 | 2023-07-24 | Reflective optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220381315U (en) |
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2023
- 2023-07-24 CN CN202321965294.2U patent/CN220381315U/en active Active
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