CN107037614A - A kind of adaptive thermal compensation high power light isolator - Google Patents
A kind of adaptive thermal compensation high power light isolator Download PDFInfo
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- CN107037614A CN107037614A CN201710446870.5A CN201710446870A CN107037614A CN 107037614 A CN107037614 A CN 107037614A CN 201710446870 A CN201710446870 A CN 201710446870A CN 107037614 A CN107037614 A CN 107037614A
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- optical crystal
- beam splitter
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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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- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
The present invention discloses a kind of adaptive thermal compensation high power light isolator, the compensator being made by using negative index temperature coefficient materials, while it has been carried out compensation to the thermal lens on magneto-optical crystal, also so that being consistent by the hot spot parameter of two pieces of performance parameter identical magneto-optical crystals, so as to carry out the optimal compensation to the thermally induced birefringence on magneto-optical crystal, and thermally induced birefringence can obtain the optimal compensation elimination with thermal lensing effect under different operating power, beam splitter is using birefringent prism to structure, reduce o light and transmission range of the e light in beam splitter material, so as to reduce absorption of the beam splitter material to light beam, reduce the thermal lensing effect of beam splitter, pass through the present invention program, the optimal compensation can be carried out to the thermal lens caused by high laser power and thermally induced birefringence, improve the isolation of high power light isolator, beam quality and resistance to high power performance, simultaneously can be to the adaptive thermal compensation of relatively low laser power.
Description
Technical field
The present invention relates to laser application field, especially a kind of adaptive thermal compensation high power light isolator.
Background technology
Because high power laser light system of processing is very sensitive to the abnormal light entered, if, return to the light of laser compared with
By force, the steady running of laser will be influenceed, more serious will damage whole laser system, so to add in laser system
Enter optoisolator, make light can only forward direction pass through, and reverse return light is filtered out.
Optoisolator be a kind of allow positive light by and stop the optical passive component that backlight passes through, to suppress high
Return light is to the adverse effect caused by laser in power laser system of processing.The magneto-optical crystal of usual optoisolator is to 1um
Laser have 0.25% absorption, this absorption fever phenomenon can be ignored in the case of relatively low laser power, but very high
In the case of laser power, thermal birefringence effect and thermal lensing effect can be produced in crystal by absorbing heating, be had a strong impact on
The extinction ratio and optical quality of output beam, cause focal shift during Laser Processing, reduce the fineness of job spotlight, and then
Influence the quality of Laser Processing.
The content of the invention
In order to solve the deficiencies in the prior art, it is an object of the invention to provide a kind of structure is reliable, isolation is high from
Adapt to thermal compensation high power light isolator.
In order to realize above-mentioned technical purpose, the technical scheme is that：
A kind of adaptive thermal compensation high power light isolator, its optical fiber collimator for including sequentially setting, enter light diaphragm, first point
Beam device, the first optical rotation plate, the first magneto-optical crystal, the first compensator, the second optical rotation plate, the second magneto-optical crystal, the second compensator,
Two beam splitters, light extraction diaphragm, described the first compensator and the second compensator are that negative index temperature coefficient materials are made, its
It is respectively placed in after the first magneto-optical crystal and the second magneto-optical crystal and for allowing by the first magneto-optical crystal and the second magneto-optical crystal
Hot spot parameter be consistent, the performance parameter of first magneto-optical crystal and the second magneto-optical crystal is identical.
Further, it is described as the first beam splitter of the invention and the one of which structural implementation of the second beam splitter
First beam splitter and the second beam splitter are birefringent prism to structure.
It is preferred that, the birefringent prism of first beam splitter and the second beam splitter can to two prism locations in structure
Exchange.
Further, it is described as the first beam splitter of the invention and other two kinds of structural implementations of the second beam splitter
First beam splitter and the second beam splitter are polarization splitting prism or block birefringece crystal.
Further, the first described magneto-optical crystal and the second magneto-optical crystal are TGG crystal or TGG ceramics or TGG glass.
Further, the first described optical rotation plate and the second optical rotation plate are quartzy optical rotation plate or 1/2nd wave plates.
Further, the outer circumferential side of first magneto-optical crystal is equipped with the first magnet ring, described the second magneto-optical crystal it is outer
The week side of boss is equipped with the second magnet ring.
, can will be above-mentioned as a kind of another embodiment of adaptive thermal compensation high power light isolator of the present invention
The first compensator of adaptive thermal compensation high power isolator be placed in before the first magneto-optical crystal, by the second described compensator
It is placed in before the second magneto-optical crystal.
Using above-mentioned technical scheme, the present invention is compared to prior art, having the beneficial effect that acquired by it：By using
The compensator that negative index temperature coefficient materials are made, while it has been carried out compensation to the thermal lens on magneto-optical crystal, also
So that being consistent by the hot spot parameter of two pieces of performance parameter identical magneto-optical crystals, so that double to the thermic on magneto-optical crystal
Refraction has carried out the optimal compensation, and using this structure, thermally induced birefringence can be obtained with thermal lensing effect under different operating power
The optimal compensation is eliminated, and beam splitter, to structure, reduces o light and transmission distance of the e light in beam splitter material using birefringent prism
From, so as to reduce absorption of the beam splitter material to light beam, the thermal lensing effect of beam splitter is reduced, by the present invention program,
The optimal compensation can also be carried out to the thermal lens caused by high laser power and thermally induced birefringence, improve high power light isolator
Isolation, beam quality and resistance to high power performance, while can be to the adaptive thermal compensation of relatively low laser power.
Brief description of the drawings
The present invention is further elaborated with reference to the accompanying drawings and detailed description：
Fig. 1 is the structure simplified diagram of adaptive thermal compensation high power light isolator embodiment one of the invention；
Fig. 2 is the positive thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment one of the invention；
Fig. 3 is the reverse thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment one of the invention；
Fig. 4 is the structure simplified diagram of adaptive thermal compensation high power light isolator embodiment two of the invention；
Fig. 5 is the positive thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment two of the invention；
Fig. 6 is the reverse thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment two of the invention；
Fig. 7 is the structure simplified diagram of adaptive thermal compensation high power light isolator embodiment three of the invention；
Fig. 8 is the positive thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment three of the invention；
Fig. 9 is the reverse thang-kng schematic diagram of adaptive thermal compensation high power light isolator embodiment three of the invention.
Embodiment
A kind of adaptive thermal compensation high power light isolator, its optical fiber collimator for including sequentially setting, enters light diaphragm,
One beam splitter, the first optical rotation plate, the first magneto-optical crystal, the first compensator, the second optical rotation plate, the second magneto-optical crystal, the second compensation
Device, the second beam splitter, light extraction diaphragm, described the first compensator and the second compensator is negative index temperature coefficient materials system
Into it is respectively placed in after the first magneto-optical crystal and the second magneto-optical crystal and for allowing by the first magneto-optical crystal and the second magneto-optic
The hot spot parameter of crystal is consistent, and the performance parameter of first magneto-optical crystal and the second magneto-optical crystal is identical.
Further, it is described as the first beam splitter of the invention and the one of which structural implementation of the second beam splitter
First beam splitter and the second beam splitter are birefringent prism to structure.
It is preferred that, the birefringent prism of first beam splitter and the second beam splitter can to two prism locations in structure
Exchange.
Further, it is described as the first beam splitter of the invention and other two kinds of structural implementations of the second beam splitter
First beam splitter and the second beam splitter are polarization splitting prism or block birefringece crystal.
Further, the first described magneto-optical crystal and the second magneto-optical crystal are TGG crystal or TGG ceramics or TGG glass.
Further, the first described optical rotation plate and the second optical rotation plate are quartzy optical rotation plate or 1/2nd wave plates.
Further, the outer circumferential side of first magneto-optical crystal is equipped with the first magnet ring, described the second magneto-optical crystal it is outer
The week side of boss is equipped with the second magnet ring.
, can will be above-mentioned as a kind of another embodiment of adaptive thermal compensation high power light isolator of the present invention
The first compensator of adaptive thermal compensation high power isolator be placed in before the first magneto-optical crystal, by the second described compensator
It is placed in before the second magneto-optical crystal.
Embodiment one
As shown in figure 1, the adaptive thermal compensation high power light isolator of the present invention includes sequentially setting optical fiber collimator 111, enters light
Diaphragm 112, the first beam splitter, the first optical rotation plate 114, the first magneto-optical crystal 115, the first compensator 116, the second optical rotation plate 117,
Second magneto-optical crystal 118, the second compensator 119, the second beam splitter, light extraction diaphragm 121, described the first magneto-optical crystal 115
Outer circumferential side is equipped with the first magnet ring 122, and the outer circumferential side of the second described magneto-optical crystal 118 is equipped with the second magnet ring 123.
First beam splitter and the second beam splitter use the frame mode of birefringent prism pair, wherein the prism of the first beam splitter
113a and prism 113b position are interchangeable, and the prism 120a and prism 120b of the second beam splitter position are interchangeable, the first rotation
Mating plate 114 can realize 22.5 degree of deflections to the polarization direction of positive transmission light, and brilliant with the first magneto-optical crystal 115 and the second magneto-optic
The yawing moment of the positive transmission light polarization direction of 118 pairs of body is on the contrary, the first optical rotation plate 114 can be to the polarization direction of reverse transfer light
Realize 22.5 degree of deflections, and the deflection with the first magneto-optical crystal 115 and brilliant 118 bodies of the second magneto-optic to reverse transfer light polarization direction
Direction is consistent.
Second optical rotation plate 117 can realize 67.5 degree of deflections to the polarization direction of positive transmission light, and with the first magneto-optical crystal
115 is identical with the yawing moment of 118 pairs of positive transmission light polarization directions of the second magneto-optical crystal, and the second optical rotation plate 117 can be to reverse
67.5 degree of deflections are realized in the polarization direction of transmission light, and with the first magneto-optical crystal 115 and the second magneto-optical crystal 118 to reverse transfer
The yawing moment of light polarization direction is opposite.
The output light of laser is changed into collimated light beam after optical fiber collimator 111, and collimated light beam is from entering light diaphragm 112
Clear aperature passes through, and its clear aperature is slightly larger than collimated beam diameter.
Schematic diagram during apparatus of the present invention forward direction thang-kng is as shown in Fig. 2 collimated light beam incides the prism of the first beam splitter
On 213a, 213b, can be divided into polarization direction it is vertical and two consistent bunch polarisations of the direction of propagation.
Two bunch polarisation vertical incidence enter the first optical rotation plate 214, and polarization direction is simultaneously toward clockwise（Also can the inverse time
Pin, according to design requirement）It has rotated 22.5 degree.
Then two bunch polarisation vertical incidence enter the first magneto-optical crystal 215, and polarization direction is simultaneously toward counterclockwise（
Can be clockwise, according to design requirement）It has rotated 22.5 degree.Then two bunch polarisations enter the first compensator 216, due to first
Magneto-optical crystal 215 has absorption to high-power incident light, generates thermal lensing effect, and light beam generates deformation, is mended by first
Repay after device 216, light beam has returned to original state.
Two bunch polarisations are after the second optical rotation plate 217, and polarization direction is toward counterclockwise（Also can be counterclockwise, according to setting
Meter demand）It has rotated 67.5 degree.
Then two bunch polarisation vertical incidence enter the second magneto-optical crystal 218, and polarization direction is simultaneously toward counterclockwise（
Can be clockwise, according to design requirement）It has rotated 22.5 degree.Then two bunch polarisations enter the second compensator 219, due to second
Magneto-optical crystal 218 has absorption to high-power incident light, generates thermal lensing effect, and light beam generates deformation, is mended by second
Repay after device 219, light beam has returned to original state.
By the compensation of the first compensator 216, the light class of the first magneto-optical crystal 215 and the second magneto-optical crystal 218 is incided
Parameter is consistent, along with the polarization direction that light beam enters the line polarisation of the first magneto-optical crystal 215 and the second magneto-optical crystal 218 is hung down
Directly, so as to carry out the optimal compensation to thermally induced birefringence.
Now, the polarization direction of two bunch polarisations is altogether past counterclockwise with respect to for the line polarisation after the first beam splitter 213
Direction（Also can be clockwise, according to design requirement）Have rotated 90 degree, two bunch polarisations by the second beam splitter prism 220a,
After 220b, a branch of collimated light is coupled into again.
The clear aperature of collimated light from light extraction diaphragm passes through, and its clear aperature is slightly larger than collimated beam diameter herein.It is real
The function of positive optical transport is showed.
Schematic diagram during the reverse thang-kng of of the invention adaptive thermal compensation high power light isolator as shown in figure 3, return light from
The clear aperature of light extraction diaphragm 321 passes through, and is divided to by prism 320a, 320b of the second beam splitter for two vertical bunch of polarization direction
Polarisation, and passed through the second compensator 319 and the second magneto-optical crystal 318 by positive light light path, because magneto-optical crystal is nonreciprocal
Property device, the polarization directions of two bunch polarisations is still simultaneously toward counterclockwise（Also can be clockwise, according to design requirement）Rotation
22.5 degree.
Then two bunch polarisations are after the second optical rotation plate 317, and polarization direction is past to be rotated clockwise 67.5 degree.
Two bunch polarisations enter the first magneto-optical crystal 315 after the first compensator 316, because magneto-optical crystal is nonreciprocal
Property device, this two bunch polarisation is after the first magneto-optical crystal 315, and its polarization direction is still simultaneously toward rotate counterclockwise 22.5
Degree.
Then two bunch polarisations are after the first optical rotation plate 314,22.5 degree toward counterclockwise rotates of polarization direction.
Now, the shape that the polarization direction of two bunch polarisations has been returned to after prism 320a, 320b of the second beam splitter
State.
When this two bunch polarisation is after prism 313a, 313b of the first beam splitter, light beam cannot be synthesized again, is all entered
Light diaphragm 312 is blocked, it is impossible to entered back into optical fiber collimator 311, realizes the function of isolation backlight.
Embodiment two
As shown in figure 4, the adaptive thermal compensation high power light isolator of the present invention include sequentially setting optical fiber collimator 411, enter
Light diaphragm 412, the first beam splitter 413, the first optical rotation plate 414, the first magneto-optical crystal 415, the first compensator 416, the second optically-active
Piece 417, the second magneto-optical crystal 418, the second compensator 419, the second beam splitter 420, light extraction diaphragm 421, the first described magneto-optic
The outer circumferential side of crystal 415 is equipped with the first magnet ring 422, and the outer circumferential side of the second described magneto-optical crystal 418 is equipped with the second magnet ring
423。
The optical isolator structure of the present embodiment is roughly the same with structure described in embodiment one, and difference is the first beam splitter
413 and second beam splitter 420 be to use polarization splitting prism（PBS）, two reverse bunch polarisations are respectively from polarization splitting prism
Side and front pass through, it is impossible to enter back into optical fiber collimator 411, other structures and light path are all identical with described in embodiment one,
Just repeat no more.
The positive thang-kng schematic diagram of the adaptive thermal compensation high power light isolator of the present embodiment is as shown in figure 5, wherein show
The optical fiber collimator 511 that goes out, enter light diaphragm 512, the first beam splitter 513, the first optical rotation plate 514, the first magneto-optical crystal 515,
One compensator 516, the second optical rotation plate 517, the second magneto-optical crystal 518, the second compensator 519, the second beam splitter 520, light extraction light
The first magnet ring 522, the periphery side ring of the second magneto-optical crystal 518 that the periphery side ring of late 421, first magneto-optical crystal 415 is set are set
Second magnet ring 523 is identical with the structure shown in Fig. 4.
The reverse thang-kng schematic diagram of the adaptive thermal compensation high power light isolator of the present embodiment is as shown in fig. 6, wherein show
The optical fiber collimator 611 that goes out, enter light diaphragm 612, the first beam splitter 613, the first optical rotation plate 614, the first magneto-optical crystal 615,
One compensator 616, the second optical rotation plate 617, the second magneto-optical crystal 618, the second compensator 619, the second beam splitter 620, light extraction light
The first magnet ring 622, the periphery side ring of the second magneto-optical crystal 618 that the periphery side ring of late 621, first magneto-optical crystal 615 is set are set
Second magnet ring 623 is identical with the structure shown in Fig. 4.
Embodiment three
As shown in fig. 7, the adaptive thermal compensation high power light isolator of the present invention include sequentially setting optical fiber collimator 711, enter
Light diaphragm 712, the first beam splitter 713, the first optical rotation plate 714, the first magneto-optical crystal 715, the first compensator 716, the second optically-active
Piece 717, the second magneto-optical crystal 718, the second compensator 719, the second beam splitter 720, light extraction diaphragm 721, the first described magneto-optic
The outer circumferential side of crystal 715 is equipped with the first magnet ring 722, and the outer circumferential side of the second described magneto-optical crystal 718 is equipped with the second magnet ring
723。
With structure described in embodiment one substantially, difference is the He of the first beam splitter 713 to the optical isolator structure of the present embodiment
Second beam splitter 720 is that, using block birefringece crystal, other structures and light path are all identical with described in embodiment one, just no longer go to live in the household of one's in-laws on getting married
State.
The positive thang-kng schematic diagram of the adaptive thermal compensation high power light isolator of the present embodiment is as shown in figure 8, wherein show
The optical fiber collimator 811 that goes out, enter light diaphragm 812, the first beam splitter 813, the first optical rotation plate 814, the first magneto-optical crystal 815,
One compensator 816, the second optical rotation plate 817, the second magneto-optical crystal 818, the second compensator 819, the second beam splitter 820, light extraction light
The first magnet ring 822, the periphery side ring of the second magneto-optical crystal 818 that the periphery side ring of late 821, first magneto-optical crystal 815 is set are set
Second magnet ring 823 is identical with the structure shown in Fig. 7.
The reverse thang-kng schematic diagram of the adaptive thermal compensation high power light isolator of the present embodiment is as shown in figure 9, wherein show
The optical fiber collimator 911 that goes out, enter light diaphragm 912, the first beam splitter 913, the first optical rotation plate 914, the first magneto-optical crystal 915,
One compensator 916, the second optical rotation plate 917, the second magneto-optical crystal 918, the second compensator 919, the second beam splitter 920, light extraction light
The first magnet ring 922, the periphery side ring of the second magneto-optical crystal 918 that the periphery side ring of late 921, first magneto-optical crystal 915 is set are set
Second magnet ring 823 is identical with the structure shown in Fig. 7.
Described in summary embodiment, because the first compensator and the second compensator use negative index temperature coefficient materials
It is made, its effect is to allow the hot spot parameter by the first magneto-optical crystal and the second magneto-optical crystal to be consistent, therefore the present invention is certainly
Adapting to the implementation structure of thermal compensation high power light isolator can also be placed in the first compensator before the first magneto-optical crystal, by institute
The second compensator stated is used before being placed in the second magneto-optical crystal, implementation structure of remaining structure with the various embodiments described above
It is identical, just repeat no more.
Although describing embodiments of the present invention above in association with accompanying drawing, those skilled in the art are according to the present invention
Spirit and scope in the case of the equivalent modification made and change, each fall within appended claims limited range it
It is interior.
Claims (8)
1. a kind of adaptive thermal compensation high power light isolator, it is characterised in that：Its optical fiber collimator for including sequentially setting, enter
Light diaphragm, the first beam splitter, the first optical rotation plate, the first magneto-optical crystal, the first compensator, the second optical rotation plate, the second magneto-optical crystal,
Second compensator, the second beam splitter, light extraction diaphragm, described the first compensator and the second compensator are negative index temperature system
Number materials are made, its be respectively placed in after the first magneto-optical crystal and the second magneto-optical crystal and for allowing by the first magneto-optical crystal and
The hot spot parameter of second magneto-optical crystal is consistent, and the performance parameter of first magneto-optical crystal and the second magneto-optical crystal is identical.
2. a kind of adaptive thermal compensation high power light isolator according to claim 1, it is characterised in that：Described first
Beam splitter and the second beam splitter are birefringent prism to structure.
3. a kind of adaptive thermal compensation high power light isolator according to claim 2, it is characterised in that：Described first point
The birefringent prism of beam device and the second beam splitter is interchangeable to two prism locations in structure.
4. a kind of adaptive thermal compensation high power light isolator according to claim 1, it is characterised in that：Described first
Beam splitter and the second beam splitter are polarization splitting prism or block birefringece crystal.
5. a kind of adaptive thermal compensation high power light isolator according to claim 1, it is characterised in that：Described first
Magneto-optical crystal and the second magneto-optical crystal are TGG crystal or TGG ceramics or TGG glass.
6. a kind of adaptive thermal compensation high power light isolator according to claim 1, it is characterised in that：Described first
Optical rotation plate and the second optical rotation plate are quartzy optical rotation plate or 1/2nd wave plates.
7. a kind of adaptive thermal compensation high power light isolator according to claim 1, it is characterised in that：First magnetic
The outer circumferential side of luminescent crystal is equipped with the first magnet ring, and the outer circumferential side of the second described magneto-optical crystal is equipped with the second magnet ring.
8. a kind of adaptive thermal compensation high power light isolator, it is characterised in that：Will be adaptive described in one of claim 1 to 7
Answer the first compensator of thermal compensation high power isolator to be placed in before the first magneto-optical crystal, the second described compensator is placed in
Before two magneto-optical crystals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710446870.5A CN107037614A (en) | 2017-06-14 | 2017-06-14 | A kind of adaptive thermal compensation high power light isolator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710446870.5A CN107037614A (en) | 2017-06-14 | 2017-06-14 | A kind of adaptive thermal compensation high power light isolator |
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| CN202870426U (en) * | 2012-10-10 | 2013-04-10 | 光越科技(深圳)有限公司 | High power isolator |
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| EP2741124A2 (en) * | 2012-12-10 | 2014-06-11 | Electro-Optics Technology, Inc. | Low focal shift KW class optical isolator |
| CN104216050A (en) * | 2014-09-18 | 2014-12-17 | 光越科技(深圳)有限公司 | Polarization beam splitting and combining device |
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2017
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| US20050174573A1 (en) * | 2002-04-18 | 2005-08-11 | Qinetiq Limited | Imaging spectrometer |
| CN202870426U (en) * | 2012-10-10 | 2013-04-10 | 光越科技(深圳)有限公司 | High power isolator |
| EP2741124A2 (en) * | 2012-12-10 | 2014-06-11 | Electro-Optics Technology, Inc. | Low focal shift KW class optical isolator |
| CN103278943A (en) * | 2013-03-29 | 2013-09-04 | 北京航空航天大学 | Faraday rotator suitable for high-power opto-isolator |
| CN104216050A (en) * | 2014-09-18 | 2014-12-17 | 光越科技(深圳)有限公司 | Polarization beam splitting and combining device |
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| 胡姝铃等: "高功率光隔离器的热效应分析与优化", 《红外与激光工程》 * |
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Application publication date: 20170811 |