CN113641013A - Polarization-based bidirectional isolator and device thereof - Google Patents
Polarization-based bidirectional isolator and device thereof Download PDFInfo
- Publication number
- CN113641013A CN113641013A CN202110932394.4A CN202110932394A CN113641013A CN 113641013 A CN113641013 A CN 113641013A CN 202110932394 A CN202110932394 A CN 202110932394A CN 113641013 A CN113641013 A CN 113641013A
- Authority
- CN
- China
- Prior art keywords
- polarization
- beam splitter
- polarized light
- optical
- polarization beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 169
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 72
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 32
- 239000004038 photonic crystal Substances 0.000 claims description 17
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 12
- 239000010409 thin film Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 5
- 239000010408 film Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000003321 amplification Effects 0.000 abstract description 14
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 14
- 239000013307 optical fiber Substances 0.000 description 6
- 230000001427 coherent effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
-
- 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
- G02F1/095—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 in an optical waveguide structure
- G02F1/0955—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 in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention provides a polarization-based bidirectional isolator, comprising: the device comprises a first optical rotation device, a polarization beam splitter and a second optical rotation device. The invention adopts the rotation polarization characteristic of the Faraday rotator and the beam splitting capability of the polarization beam splitter, can complete the bidirectional passing of different polarized light, and can play a certain role in isolation. The laser system can be protected under specific conditions, and meanwhile, the amplification efficiency of the system can be improved.
Description
Technical Field
The invention relates to the technical field of ultrafast laser, in particular to ultrafast fiber laser technology, and specifically relates to a polarization-based bidirectional isolator, a device and an application thereof.
Background
The ytterbium-doped fiber laser has the advantages of high average power, excellent heat dissipation performance, high-efficiency electro-optic conversion efficiency, excellent beam quality, relatively low cost, relatively small space volume and the like, and is more and more widely applied to the fields of basic science, industrial processing, biomedical treatment and the like.
In order to increase the average power output by the fiber laser, a large mode field fiber, such as a rod-shaped photonic crystal fiber, is generally used, and on the other hand, in order to increase the gain and the average power of the system, a double-pass amplification technique and a ring structure are often used.
However, the existing two-way amplification technology and the annular structure have certain defects: because the angle of the output end face of the large-mode-field optical fiber is generally small, certain reflection can be caused on the output end face of the optical fiber, and because the gain of the double-pass system with the annular structure is high, useless amplification components can be formed reversely, the gain of main amplification is preempted, and the amplification efficiency and the synthesis efficiency are greatly reduced.
Disclosure of Invention
Therefore, an object of the present invention is to overcome the defects and limitations in the prior art, and to provide a polarization-based bidirectional isolator, a device thereof, and an application thereof, wherein the isolator can suppress the reverse amplification caused by the end-face reflection, and the isolator has a simple structure, so that the overall efficiency of a coherent combining system can be greatly improved.
To achieve the above object, a first aspect of the present invention provides a polarization-based bidirectional isolator, comprising: a first optical rotator, a polarization beam splitter, a second optical rotator; wherein:
the output end of the first optical rotator is connected with the left input end of the polarization beam splitter; the left input end of the polarization beam splitter is connected with the output end of the first optical rotator, and the right end of the polarization beam splitter is connected with the left output end of the second optical rotator; the left output end of the second optical rotator is connected with the right end of the polarization beam splitter;
preferably, the first optical rotator and/or the second optical rotator is a faraday rotator.
The polarization-based bidirectional isolator according to the first aspect of the present invention, wherein the first optical rotation device is configured to rotate polarization directions of left-side incoming light and right-side incoming light; the polarization beam splitter is used for filtering part of polarized light passing through the first optical rotation device or the second optical rotation device; the second optical rotation device is used for rotating the polarization directions of the left-side entering light and the right-side entering light;
preferably, the first optical rotation device and the second optical rotation device perform the same direction regulation and control on the polarization direction of light through a magnetic field.
The polarization based bidirectional isolator according to the first aspect of the present invention, wherein the polarization beam splitter is selected from one or more of: a polarizing beam splitter cube, a polarizing thin film beam splitter, a glan-thomson prism, preferably a polarizing beam splitter cube or a polarizing thin film beam splitter.
The polarization-based bidirectional isolator according to the first aspect of the present invention, wherein when the polarization beam splitter is a polarization thin film beam splitter, the spatial separation of the pulses is achieved by the difference of reflectivity and transmissivity of the polarization thin film beam splitter to the pulses with different polarization directions.
The polarization based bi-directional isolator according to the first aspect of the present invention, wherein the device left side receives horizontally polarized light; the first optical rotation device rotates the polarization direction of the horizontally polarized light into a polarization direction 45 degrees from the vertical direction; the polarization beam splitter arranged at 45 degrees to the vertical direction enables linearly polarized light after the first optical rotation device rotates to directly pass through the polarization beam splitter; the second optical rotator rotates the polarization direction of the left input line polarized light by 45 degrees in the direction opposite to the rotation direction of the first optical rotator, and restores the polarization direction same as that of the horizontal polarized light;
preferably, when the horizontally polarized light has a vertically polarized component, the horizontally polarized light is isolated by the polarization beam splitter after being rotated by the first optical rotation device;
more preferably, the horizontally polarized light is transmitted from left to right.
The polarization based bi-directional isolator according to the first aspect of the present invention, wherein the right side of the device receives vertically polarized light; the second optical rotation device rotates the vertically polarized light polarization by 45 degrees in the opposite direction; the polarization beam splitter enables linearly polarized light after the second optical rotation device rotates to directly pass through the polarization beam splitter; the first optical rotation device rotates the polarization direction of the right-side input line polarized light by 45 degrees opposite to the rotation direction of the second optical rotation device, and restores the same polarization direction as the vertically polarized light.
The polarization-based bidirectional isolator according to the first aspect of the present invention, wherein, when there is a horizontally polarized component in the vertically polarized light, the vertically polarized light is isolated by the polarization beam splitter after being rotated by the second optical rotation device; and/or
The vertically polarized light is transmitted from right to left.
A second aspect of the invention provides a double pass and annular amplifying device comprising the polarization based bidirectional isolator of the first aspect.
The double-pass and annular amplifying device according to the second aspect of the present invention, wherein the double-pass and annular amplifying device further comprises: the device comprises a femtosecond laser front end, an isolator, a half-wave plate, a polarization beam splitter, a reflector, a plano-convex lens, a rod-shaped photonic crystal fiber, a first optical rotator and a second optical rotator; wherein:
the femtosecond laser front-end module preferably outputs an linear polarization ultrashort pulse sequence;
the femtosecond laser front-end module is preferably a fiber laser or a solid-state laser, and more preferably an ytterbium-doped fiber oscillator or a ytterbium-doped fiber amplifier; most preferably an ytterbium-doped fiber oscillator based on semiconductor protectable absorption mirror mode locking;
the average power of the linear polarization ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 10-60 mW, more preferably 20-50 mW, and further preferably 40 mW;
the central wavelength range of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 1-1.06 μm, and most preferably 1.04 μm;
the half-height and width range of the spectrum of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 10-20 nm, and most preferably 16 nm; and/or
The repetition frequency range of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 40-50 MHz, and most preferably 45 MHz.
A third aspect of the invention provides an isolation device for preventing bidirectional return light, the isolation device comprising the polarization-based bidirectional isolator of the first aspect.
According to one aspect of the present invention, a simple polarization-based bidirectional isolator is provided. The device comprises: the device comprises a first Faraday optical rotation device, a polarization beam splitter and a second Faraday optical rotation device; wherein:
the output end of the first Faraday rotator is connected with the left input end of the polarization beam splitter, and the first Faraday rotator is used for rotating the polarization directions of left-side entering light and right-side entering light;
the left end of the polarization beam splitter is connected with the output end of the first Faraday optical rotator and is also connected with the output end of the second Faraday optical rotator, and the polarization beam splitting cube or the film beam splitter is used for filtering part of polarized light passing through the first Faraday optical rotator or the second Faraday optical rotator;
the left output end of the second Faraday rotator is connected with the right end of the polarization beam splitter, and the second Faraday rotator is used for rotating the polarization directions of left-side entering light and right-side entering light;
according to the isolator device based on bidirectional polarization filtering, the first Faraday optical rotator and the second Faraday optical rotator are Faraday optical rotators, and the polarization directions of light are regulated and controlled in the same direction by utilizing a magnetic field.
According to the invention, the isolator device based on bidirectional polarization filtering is characterized in that the polarization beam splitter is selected from one or more of the following components: the device comprises a polarization beam splitting cube beam splitter, a polarization film beam splitting sheet and a Glan-Thomson prism; preferably, the polarization beam splitter is a polarization beam splitting cube or a thin film polarization beam splitting plate.
Further preferably, the polarization beam splitter is a thin film polarization beam splitter, and the pulses are spatially separated by using the difference of reflectivity and transmissivity of the polarization thin film beam splitter to the pulses with different polarization directions.
The left side of the device receives horizontally polarized light a; the first Faraday rotator rotates the polarization direction of the horizontal polarized light by 45 degrees to form a b with an included angle of 45 degrees between the polarization direction and the vertical direction; the obliquely arranged polarization beam splitter enables linearly polarized light which is rotated by 45 degrees by the first Faraday rotator to directly pass through the polarization beam splitter, and transmitted light is c; the second Faraday rotator rotates the polarization direction of the left input line polarized light by 45 degrees in the opposite direction of the rotation direction of the first Faraday rotator to recover the polarization direction the same as a, and horizontal polarized light d is obtained; if a vertical polarization component exists in a, j is isolated by the polarization beam splitter after the first Faraday rotator rotates 45 degrees;
the right side of the device receives vertically polarized light e; the second Faraday rotator rotates the polarization direction of the vertically polarized light by 45 degrees to be f opposite to the rotation direction of the first Faraday rotator; the polarization beam splitter enables linearly polarized light which is rotated by 45 degrees by the second Faraday optical rotator to directly pass through the polarization beam splitter, and transmitted light is g; the first Faraday rotator rotates the polarization direction of right-side input line polarized light by 45 degrees in the direction opposite to the rotation direction of the second Faraday rotator to recover the polarization direction same as the polarization direction of e, so that vertical polarized light h is obtained; if the horizontal polarization component exists in the e, the horizontal polarization component is separated into i by the polarization beam splitter after being rotated by 45 degrees by the second Faraday rotator;
the polarization-based bidirectional isolator of the present invention can have the following beneficial effects, but is not limited to:
1. the polarization-based bidirectional isolator can greatly improve the amplification and coherent synthesis efficiency of structures such as a double-pass ring amplifier and the like, and can greatly weaken the influence of return light reflected by the end face of an optical fiber on a system by utilizing the characteristics of a Faraday rotator and a polarization beam splitter.
2. The polarization-based bidirectional isolator has strong applicability, is not limited to a double-pass annular amplifying structure, and is an isolating device capable of preventing bidirectional return light.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 shows a schematic diagram of a polarization-based bidirectional isolator of embodiment 1 of the present invention.
Fig. 2 shows a schematic diagram of an apparatus using a polarization-based bidirectional isolator in a double-pass annular amplifying structure according to embodiment 2 of the present invention.
Description of reference numerals:
(1) a first Faraday rotator; (2) a polarization beam splitter; (3) a second Faraday rotator; 1. a femtosecond laser front end; 2. an isolator; 3. a half-wave plate; 4. a first polarizing beam splitter; 5. a first reflector; 6. a first plano-convex lens; 7. a first rod-like photonic crystal fiber; 8. a second plano-convex lens; 9. a second reflector; 10. a first Faraday rotator; 11. the second polarization beam splitter is obliquely arranged at an included angle of 45 degrees with the vertical direction; 12. a second Faraday rotator; 13. a third reflector; 14. a third plano-convex lens; 15. a second rod-shaped photonic crystal fiber; 16. and a fourth plano-convex lens.
a. Horizontally polarized light emitted from left to right; b. linearly polarized light of 45 degrees is rotated by a first Faraday rotator; c. linearly polarized light directly transmitted by the polarization beam splitter; d. rotating the horizontally polarized light in the direction opposite to the rotating direction of the first Faraday rotator by the second Faraday rotator; e. vertical polarized light emitted from right to left; f. linearly polarized light of 45 degrees is rotated by a second Faraday rotator; g. linearly polarized light directly transmitted by the polarization beam splitter; h. rotating vertically polarized light in a direction opposite to that of the second Faraday rotator by the first Faraday rotator; i. horizontally polarized light transmitted from right to left; j. vertically polarized light transmitted from left to right; A. linearly polarized light emitted by the front end of the femtosecond laser; B. separating the upwardly transmitted vertically polarized light by a first polarizing beam splitter; C. splitting the horizontally polarized light transmitted to the right by a first polarization beam splitter; D. b, vertical polarized light amplified by the first rod-shaped photonic crystal fiber; E. c, horizontal polarized light amplified by the second rod-shaped photonic crystal fiber; F. horizontally polarized light reflected by the end cap at the left side of the first rod-shaped photonic crystal fiber; G. the vertically polarized light is reflected by the end cap at the left side of the second rod-shaped photonic crystal fiber; H. the horizontal polarized light and the vertical polarized light after the two times of amplification are synthesized into linearly polarized light with an included angle of 45 degrees with the vertical direction at the first polarization beam splitter.
Detailed Description
The invention is further illustrated by the following specific examples, which, however, are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
This section generally describes the materials used in the testing of the present invention, as well as the testing methods. Although many materials and methods of operation are known in the art for the purpose of carrying out the invention, the invention is nevertheless described herein in as detail as possible. It will be apparent to those skilled in the art that the materials and methods of operation used in the present invention are well within the skill of the art, provided that they are not specifically illustrated.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For convenience of illustration and description, the embodiment of the present invention is illustrated using two amplifiers as an example, and it should not be understood that the present invention is limited to two.
Example 1
This example serves to illustrate the structure of the polarization based bi-directional isolator of the present invention.
As shown in fig. 1: FIG. 1 is a polarization based bi-directional isolator. It includes: a first Faraday rotator (1), a polarization beam splitter (2) and a second Faraday rotator (3).
The left side of the device receives horizontally polarized light a; the first Faraday rotator 1 rotates the polarization direction of the horizontal polarized light by 45 degrees to form a polarization direction b with an included angle of 45 degrees between the polarization direction b and the horizontal direction b; the polarization beam splitter 2 enables linearly polarized light which is rotated by 45 degrees by the first Faraday optical rotator 1 to directly pass through the polarization beam splitter, and transmitted light is c; the second Faraday rotator 3 rotates the polarization direction of the left input line polarized light by 45 degrees opposite to the rotation direction of the first Faraday rotator 1 to recover the polarization direction same as the horizontal polarized light a, and then horizontal polarized light d is obtained; if the horizontal polarized light a has a vertical polarized component, the horizontal polarized light a is rotated by 45 degrees by the first faraday rotator 1 and then isolated by the polarization beam splitter into vertical polarized light j.
The right side of the device receives vertically polarized light e; the second Faraday rotator 3 rotates the polarization direction of the vertically polarized light by 45 degrees to f, which is opposite to the rotation direction of the first Faraday rotator 1; the polarization beam splitter 2 enables linearly polarized light which is rotated by 45 degrees by the second Faraday optical rotator 3 to directly pass through the polarization beam splitter, and transmitted light is g; the first Faraday rotator 1 rotates the polarization direction of the right input line polarized light by 45 degrees opposite to the rotation direction of the second Faraday rotator 3 to recover the polarization direction same as that of the vertical polarized light e, so as to obtain vertical polarized light h; if there is a horizontal polarization component in the vertically polarized light e, the horizontally polarized light i will be separated by the polarization beam splitter after being rotated by 45 degrees by the second faraday rotator 3.
Example 2
This embodiment is for explaining the structure of the two-pass ring amplifying device of the present invention.
To further illustrate the operation of the polarization based bi-directional isolator of the present invention, it is illustrated in the double pass annular amplifying device shown in FIG. 2. It is not intended that the bi-directional isolator be used in the device only.
As shown in fig. 2: FIG. 2 shows a schematic of an apparatus using a polarization based bi-directional isolator in a two-pass ring amplification apparatus. The double-pass annular amplifying device comprises: the device comprises a femtosecond laser front end 1, an isolator 2, a half-wave plate 3, a first polarization beam splitter 4, a first reflector 5, a first plano-convex lens 6, a first rod-shaped photonic crystal fiber 7, a second plano-convex lens 8, a second reflector 9, a first Faraday optical rotator 10, a second polarization beam splitter 11 obliquely arranged at an included angle of 45 degrees with the vertical direction, a second Faraday optical rotator 12, a third reflector 13, a third plano-convex lens 14, a second rod-shaped photonic crystal fiber 15 and a fourth plano-convex lens 16.
In the embodiment as shown in fig. 2, the femtosecond laser front-end module 1 adopts an ytterbium-doped fiber oscillator capable of protecting mode locking of the absorption mirror by using a semiconductor, and the output ultra-short pulse sequence has the following corresponding parameters: the central wavelength is 1.04 mu m, the full width at half maximum of the spectrum is 16nm, the repetition frequency is 45MHz, and a linear polarization ultrashort pulse sequence A with the average power of 40mW can be output. After directly entering the isolator 2 and the half-wave plate 3, the light is divided into vertically polarized light B and horizontally polarized light C with equal power through a first polarization beam splitter 4.
The vertically polarized light B passes through a first reflector 5 and a first plano-convex lens 6 and then is coupled to a first rod-shaped photonic crystal fiber 7 for amplification, and then is collimated and emitted as a pulse D by a second plano-convex lens 8. Then enters the polarization-based bidirectional isolator through the second reflecting mirror 9 and consists of a first Faraday rotator 10, a second polarization beam splitter 11 and a second Faraday rotator 12, wherein the second polarization beam splitter and the second Faraday rotator are obliquely arranged at an included angle of 45 degrees with the vertical direction. D in the vertical polarization direction firstly rotates 45 degrees in the polarization direction of the first Faraday rotator, completely passes through the polarization beam splitter 11 with the angular bisector of the transmission end and the reflection end as the vertical direction, and rotates the polarization direction of light back to the vertical direction through the second Faraday rotator. And then the optical fiber is coupled into a second rod-shaped photonic crystal fiber 15 through a third plano-convex lens 14 for amplification, and then the optical fiber enters the first polarization beam splitter 4 after being collimated through a fourth plano-convex lens 16.
The horizontal polarized light C is opposite to the vertical polarized light B in the transmission direction, is coupled into a second rod-shaped photonic crystal fiber 15 through a fourth plano-convex lens and then is amplified through a third plano-convex lens 14 to be collimated into horizontal polarized light E, and enters a polarization-based bidirectional isolator through a third reflector 13, and firstly, the polarization direction is rotated by 45 degrees through a second Faraday optical rotator 12 to directly penetrate through a second polarization beam splitter 11 which is obliquely arranged at 45 degrees with the vertical direction included angle, and then the polarization is converted into horizontal polarization through a first Faraday optical rotator 1. Then the light beam is coupled into a first rod-shaped photonic crystal fiber 7 through a second reflecting mirror 9 and a second plano-convex lens 8 for amplification, and then the light beam is collimated by a first plano-convex lens 6 and enters a first polarization beam splitter 4 through a first reflecting mirror 5. And coherently combined with the vertically polarized light to form a pulse H output.
When the horizontal polarized light is output from the left end of the first rod-shaped photonic crystal fiber 7, part of the horizontal polarized light can be reflected on the end face of the left end, the horizontal polarized light enters the first Faraday optical rotator 10 and rotates 45 degrees in the opposite direction, then the horizontal polarized light is changed into vertical polarized light relative to the second polarization beam splitter 11 obliquely arranged at an included angle of 45 degrees with the vertical direction, and then the vertical polarized light is output from an F port, when the vertical polarized light is output from the left end of the second rod-shaped photonic crystal fiber 15, part of the vertical polarized light can be reflected on the end face of the left end, the horizontal polarized light enters the second Faraday optical rotator 12 and rotates 45 degrees, the horizontal polarized light is changed into vertical polarized light relative to the second polarization beam splitter 11 obliquely arranged at an included angle of 45 degrees with the vertical direction, the vertical polarized light is output from a G port, and the effect of homodromous passing and isolation is achieved.
The embodiment combines the advantages of the double-pass and annular amplifying devices, prevents the influence of the return light caused by the reflection of the end face of the rod-shaped optical fiber, and greatly improves the amplification and coherent combination efficiency of the system. The invention is beneficial to improving the power and efficiency level of the fiber laser and simultaneously expanding the application field of the fiber laser.
Although the present invention has been described to a certain extent, it is apparent that appropriate changes in the respective conditions may be made without departing from the spirit and scope of the present invention. It is to be understood that the invention is not limited to the described embodiments, but is to be accorded the scope consistent with the claims, including equivalents of each element described.
Claims (10)
1. A polarization based bidirectional isolator, comprising: a first optical rotator, a polarization beam splitter, a second optical rotator; wherein:
the output end of the first optical rotator is connected with the left input end of the polarization beam splitter; the left input end of the polarization beam splitter is connected with the output end of the first optical rotator, and the right end of the polarization beam splitter is connected with the left output end of the second optical rotator; the left output end of the second optical rotator is connected with the right end of the polarization beam splitter;
preferably, the first optical rotator and/or the second optical rotator is a faraday rotator.
2. The bi-directional isolator of claim 1, wherein:
the first optical rotation device is used for rotating the polarization directions of the left-side entering light and the right-side entering light; the polarization beam splitter is used for filtering part of polarized light passing through the first optical rotation device or the second optical rotation device; the second optical rotation device is used for rotating the polarization directions of the left-side entering light and the right-side entering light;
preferably, the first optical rotation device and the second optical rotation device perform the same direction regulation and control on the polarization direction of light through a magnetic field.
3. The bidirectional isolator of claim 1 or 2, wherein: the polarizing beam splitter is selected from one or more of: a polarizing beam splitter cube, a polarizing thin film beam splitter, a glan-thomson prism, preferably a polarizing beam splitter cube or a polarizing thin film beam splitter.
4. The bidirectional isolator of any one of claims 1 to 3, wherein: when the polarization beam splitter is a polarization film beam splitter, the spatial separation of the pulses is realized through the difference of the reflectivity and the transmissivity of the polarization film beam splitter to the pulses with different polarization directions.
5. The bidirectional isolator of any one of claims 1 to 4, wherein: the left side of the device receives horizontally polarized light; the first optical rotation device rotates the polarization direction of the horizontally polarized light to be opposite to the polarization direction of which the vertical direction is 45 degrees; the polarization beam splitter arranged at 45 degrees to the vertical direction enables linearly polarized light after the first optical rotation device rotates to directly pass through the polarization beam splitter; the second optical rotator rotates the polarization direction of the left input line polarized light by 45 degrees in the direction opposite to the rotation direction of the first optical rotator, and restores the polarization direction same as that of the horizontal polarized light;
preferably, when the horizontally polarized light has a vertically polarized component, the horizontally polarized light is isolated by the polarization beam splitter after being rotated by the first optical rotation device;
more preferably, the horizontally polarized light is transmitted from left to right.
6. The bidirectional isolator of any one of claims 1 to 5, wherein: the right side of the device receives vertically polarized light; the second optical rotation device rotates the vertically polarized light polarization by 45 degrees in the opposite direction; the polarization beam splitter enables linearly polarized light after the second optical rotation device rotates to directly pass through the polarization beam splitter; the first optical rotation device rotates the polarization direction of the right-side input line polarized light by 45 degrees opposite to the rotation direction of the second optical rotation device, and restores the same polarization direction as the vertically polarized light.
7. The bi-directional isolator of claim 6, wherein:
when the vertical polarized light contains a horizontal polarized component, the vertical polarized light is isolated by the polarization beam splitter after being rotated by the second optical rotator; and/or
The vertically polarized light is transmitted from right to left.
8. A bi-pass and annular amplifying device is characterized in that: the double pass and annular amplifying device comprising a polarization based bi-directional isolator as claimed in any one of claims 1 to 7.
9. The double pass and annular amplifying device according to claims 1 to 8, further comprising: the device comprises a femtosecond laser front end, an isolator, a half-wave plate, a polarization beam splitter, a reflector, a plano-convex lens, a rod-shaped photonic crystal fiber, a first optical rotator and a second optical rotator; wherein:
the femtosecond laser front-end module preferably outputs an linear polarization ultrashort pulse sequence;
the femtosecond laser front-end module is preferably a fiber laser or a solid-state laser, and more preferably an ytterbium-doped fiber oscillator or a ytterbium-doped fiber amplifier; most preferably an ytterbium-doped fiber oscillator based on semiconductor protectable absorption mirror mode locking;
the average power of the linear polarization ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 10-60 mW, more preferably 20-50 mW, and further preferably 40 mW;
the central wavelength range of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 1-1.06 μm, and most preferably 1.04 μm;
the half-height and width range of the spectrum of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 10-20 nm, and most preferably 16 nm; and/or
The repetition frequency range of the ultrashort pulse sequence output by the femtosecond laser front-end module is preferably 40-50 MHz, and most preferably 45 MHz.
10. An isolation device for blocking bidirectional return light, said isolation device comprising: the polarization based bi-directional isolator of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110932394.4A CN113641013A (en) | 2021-08-13 | 2021-08-13 | Polarization-based bidirectional isolator and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110932394.4A CN113641013A (en) | 2021-08-13 | 2021-08-13 | Polarization-based bidirectional isolator and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113641013A true CN113641013A (en) | 2021-11-12 |
Family
ID=78421679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110932394.4A Pending CN113641013A (en) | 2021-08-13 | 2021-08-13 | Polarization-based bidirectional isolator and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113641013A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114935795A (en) * | 2022-07-25 | 2022-08-23 | 中国科学技术大学 | Bidirectional isolator related to polarization maintaining optical fiber fast and slow axes and bidirectional mode-locked laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04349421A (en) * | 1991-05-27 | 1992-12-03 | Sumitomo Electric Ind Ltd | Optical isolator |
| CN1346065A (en) * | 2000-08-24 | 2002-04-24 | Jds尤尼费斯公司 | Bidirectional isolator |
| CN1514263A (en) * | 2002-07-09 | 2004-07-21 | 北京鑫海莱光电科技有限公司 | Multipassage photo isolator |
| CN213423520U (en) * | 2020-08-10 | 2021-06-11 | 珠海光焱科技有限公司 | High-power optical fiber two-stage isolator integrating return light monitoring |
-
2021
- 2021-08-13 CN CN202110932394.4A patent/CN113641013A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04349421A (en) * | 1991-05-27 | 1992-12-03 | Sumitomo Electric Ind Ltd | Optical isolator |
| CN1346065A (en) * | 2000-08-24 | 2002-04-24 | Jds尤尼费斯公司 | Bidirectional isolator |
| CN1514263A (en) * | 2002-07-09 | 2004-07-21 | 北京鑫海莱光电科技有限公司 | Multipassage photo isolator |
| CN213423520U (en) * | 2020-08-10 | 2021-06-11 | 珠海光焱科技有限公司 | High-power optical fiber two-stage isolator integrating return light monitoring |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114935795A (en) * | 2022-07-25 | 2022-08-23 | 中国科学技术大学 | Bidirectional isolator related to polarization maintaining optical fiber fast and slow axes and bidirectional mode-locked laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9991664B1 (en) | High-efficiency high-power ring laser amplifier | |
| EP3667839B1 (en) | Optical module and erbium-doped fiber amplifier | |
| JP5933591B2 (en) | Optically locked high energy OPO-OPA | |
| CN113410739A (en) | Pre-chirped management femtosecond pulse laser coherent synthesis amplifying device and system thereof | |
| CN106469887B (en) | Double-pass amplifier of photonic crystal fiber | |
| US8373924B2 (en) | Frequency-tripled fiber MOPA | |
| CN103236629A (en) | Polarization-stable optical fiber laser cascade amplifier | |
| JP2015506489A (en) | Laser light source with peak power exceeding 100 terawatts and high contrast | |
| CN103311791B (en) | Femtosecond optical parameter amplifier | |
| CN106911069A (en) | A kind of chamber adjustable optical fiber femtosecond laser long | |
| CN113641013A (en) | Polarization-based bidirectional isolator and device thereof | |
| CN112688147A (en) | Pre-chirp management femtosecond laser pulse amplification device and application | |
| CN203205699U (en) | Fiber solid mixing ultrashort pulse laser amplifier | |
| CN110350387A (en) | A kind of full polarization fibre mode-locked laser of the high single pulse energy of low-repetition-frequency | |
| CN204992240U (en) | Fiber laser of phase place biasing ware and applied phase place biasing ware | |
| JP2015035602A5 (en) | ||
| CN105048268B (en) | A kind of optical fiber laser of integrated phase bias device and application integration phase bias device | |
| RU2564519C2 (en) | Passively mode-locked fibre pulsed ring laser (versions) | |
| WO2020098300A1 (en) | Mixed type photo-isolator | |
| CN106711751B (en) | All-solid-state dual-wavelength ultrafast laser and working method thereof | |
| CN206259606U (en) | Novel high-efficiency high-power annular laser amplifier | |
| CN109031853A (en) | A kind of phase sensitive optical parametric amplifier and its operation method | |
| JP2014522097A (en) | Optical pulse source with increased peak power | |
| CN113991399B (en) | Bidirectional isolation ring laser amplification device, method and system based on circular polarization | |
| EP2302746A2 (en) | Method and apparatus for multipass optical amplification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211112 |