CN102621704A - Four-pass laser amplifying device - Google Patents
Four-pass laser amplifying device Download PDFInfo
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- CN102621704A CN102621704A CN2012100777105A CN201210077710A CN102621704A CN 102621704 A CN102621704 A CN 102621704A CN 2012100777105 A CN2012100777105 A CN 2012100777105A CN 201210077710 A CN201210077710 A CN 201210077710A CN 102621704 A CN102621704 A CN 102621704A
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Abstract
The invention provides a four-pass laser amplifying device which comprises a first polarizing device, a faraday rotator, a half-wave plate, a second polarizing device, a quarter-wave plate, an amplifier, a first reflector and a second reflector, wherein the first polarizing device, the faraday rotator, the half-wave plate, the second polarizing device, the quarter-wave plate, the amplifier and the first reflector are sequentially arranged on a main light path, and the second reflector is arranged on a slave light path; the first polarizing device is suitable for the transmission of first-polarization-state polarized light and can reflect second-polarization-state polarized light; an angle between polarization planes of the first-polarization-state polarized light and the second-polarization-state polarized light is 90 degrees; the faraday rotator is a left-rotating faraday rotator; an inclined angle between the incident light vibration plane of the half-wave plate and an optical axis of crystal is 22.5 degrees; the half-wave plate is suitable to be used for rotating a polarization plane of incident polarized light clockwise by taking the traveling direction of light as an axis; and the second polarizing device is suitable for the transmission of first-polarization-state polarized light and can reflect second-polarization-state polarized light. The amplifying device disclosed by the invention is compact in structure, and space-saving.
Description
Technical field
The present invention relates to a kind of laser amplification device, relate in particular to a kind of laser quadruple pass multiplying arrangement.
Background technology
Along with the development of laser technology, people require increasingly highly to laser instrument output energy, and laser aid develops to the direction of compact conformation gradually simultaneously.
Prior art will realize amplifying for 4 times of laser energy, can adopt scheme as shown in Figure 1, and laser makes laser realize amplifying step by step successively through 4 the same laser amplifiers.This scheme will realize 4 times of amplifications of energy, and the laser amplifier quantity that takies is many, and simultaneously, laser amplifier needs water receiving, connects electricity, needs the space of use big, and in the process that laser amplifier is installed, wastes time and energy, and production cost is high.
So laser instrument multiplying arrangement cost of the prior art is high, it is big to take up room, and uses inconvenient.
Summary of the invention
The technical matters that the present invention will solve provides a kind of laser quadruple pass multiplying arrangement of compact conformation, saves the space and has reduced cost.
According to an aspect of the present invention, a kind of laser quadruple pass multiplying arrangement is provided, comprises:
Be successively set on first polarizer, Faraday polarization apparatus, 1/2nd wave plates, second polarizer, quarter-wave plate, amplifier and first catoptron on the main optical path; And be arranged on second catoptron on the light path; This second catoptron is suitable for the polarized light vertical reflection from second polarizer is returned second polarizer, makes reflected light after second polarizer reflects once more, be coupled into main optical path;
Said first polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state; The polarization polarization surface of said first polarization state and second polarization state differs 90 degree;
Said Faraday polarization apparatus is left-handed Faraday polarization apparatus;
The incident light plane of oscillation of said 1/2nd wave plates and the angle between the optical axis of crystal are 22.5 degree; It is axis 45 degree that turn clockwise with the direct of travel of light that this 1/2nd wave plate is suitable for the plane of polarization of incident polarized light;
Said second polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state.
Optional, described laser quadruple pass multiplying arrangement also comprises:
The beam-shrinked mirror group is suitable for the beam size of input polarization light is narrowed down to the crystal diameter of amplifier.
Optional, described laser quadruple pass multiplying arrangement also comprises: second amplifier;
Between second polarizer of this second amplifier in second catoptron and main optical path from light path.
Optional, the location swap of said quarter-wave plate and said amplifier.
Optional, the location swap of said Faraday polarization apparatus and said 1/2nd wave plates.
According to a further aspect of the present invention, a kind of laser quadruple pass multiplying arrangement is provided, comprises:
Be successively set on first polarizer, Faraday polarization apparatus, 1/2nd wave plates, second polarizer, quarter-wave plate, amplifier and first catoptron on the main optical path; And be arranged on second catoptron on the light path; This second catoptron is suitable for the polarized light vertical reflection from second polarizer is returned second polarizer, makes reflected light after second polarizer reflects once more, be coupled into main optical path;
Said first polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state; The polarization polarization surface of said first polarization state and second polarization state differs 90 degree;
Said Faraday polarization apparatus is the dextrorotation Faraday polarization apparatus;
The incident light plane of oscillation of said 1/2nd wave plates and the angle between the optical axis of crystal are 22.5 degree; It is that axis is rotated counterclockwise 45 degree with the direct of travel of light that this 1/2nd wave plate is suitable for the plane of polarization of incident polarized light;
Said second polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state.
Optional, said laser quadruple pass multiplying arrangement also comprises:
The beam-shrinked mirror group is suitable for the beam size of input polarization light is narrowed down to the crystal diameter of amplifier.
Optional, said laser quadruple pass multiplying arrangement also comprises: second amplifier;
Between second polarizer of this second amplifier in second catoptron and main optical path from light path.
Optional, the location swap of said quarter-wave plate and said amplifier.
Optional, the location swap of said Faraday polarization apparatus and said 1/2nd wave plates.
Compared with prior art, the invention has the advantages that: (1) compact conformation, save the space; (2) cost is low, has reduced the usage quantity of laser amplifier; (3) time of saving installation and resonance-amplifier is easy to use.
Description of drawings
Fig. 1 is in the prior art, the structural representation of laser quadruple pass multiplying arrangement;
Fig. 2 is the performance introduction synoptic diagram of Faraday polarization apparatus and 1/2nd wave plates (be λ/2 wave plates, be shown as λ/2 wave plates among the figure);
Fig. 3 a is according to one embodiment of the invention, the structural representation of a kind of laser quadruple pass multiplying arrangement that provides;
Fig. 3 b is according to one embodiment of the invention, changes synoptic diagram behind polarization polarization state of light clockwise Faraday polarization apparatus of process and 1/2nd wave plates;
Fig. 3 c is according to one embodiment of the invention, changes synoptic diagram behind polarization polarization state of light counterclockwise Faraday polarization apparatus of process and 1/2nd wave plates;
Fig. 4 is according to a further embodiment of the invention, the structural representation of a kind of laser quadruple pass multiplying arrangement that provides;
Fig. 5 is according to a further embodiment of the invention, the structural representation of a kind of laser quadruple pass multiplying arrangement that provides;
Fig. 6 is according to a further embodiment of the invention, the structural representation of a kind of laser quadruple pass multiplying arrangement that provides;
Fig. 7 is according to a further embodiment of the invention, the structural representation of a kind of laser quadruple pass multiplying arrangement that provides.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, to further explain of the present invention.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Principle is for a better understanding of the present invention at first introduced the character of Faraday polarization apparatus and 1/2nd wave plates.With reference to figure 2, what wherein the first half was described is the characteristic of Faraday polarization apparatus, and what the latter half was described is the characteristic of 1/2nd wave plates.
Faraday polarization apparatus comprises dextrorotation and left-handed two kinds, and wherein, dextrorotation makes the vibration plane/vibration vector of polarized light change 45 ° clockwise, and the left-handed vibration plane/vibration vector of polarized light that makes changes 45 ° counterclockwise.With reference to figure 2 the first half, to clockwise turn to example, the dextrorotation Faraday polarization apparatus changes 45 ° clockwise with incident light.When polarized light oppositely passes through Faraday polarization apparatus, will change 45 ° by the fairing hour hands.
Similarly, the Faraday polarization apparatus that is rotated counterclockwise (left-handed) all is rotated counterclockwise 45 ° for forward and the polarized light that oppositely passes through.
And for 1/2nd wave plates, with reference to figure 2 the latter halfs, it changes 2 θ with forward entrance fairing hour hands; Then change 2 θ during through 1/2nd wave plates counterclockwise when polarized light is reverse.Wherein θ representes the direction of vibration of incident polarized light and the optical axis included angle of wave plate.
According to one embodiment of the invention, a kind of laser quadruple pass multiplying arrangement is provided; Of Fig. 3 a, this multiplying arrangement comprises: polaroid 101, Faraday polarization apparatus 1/102nd, two wave plate 103, polaroid 104, quarter-wave plate 105, amplifier 106, catoptron 107 and 108.
It is following to utilize this multiplying arrangement to carry out the light path that quadruple pass amplifies:
The linearly polarized light of horizontal polarization gets into (representing with arrow among Fig. 3 a) from a, through polaroid 101 transmissions; These polaroid 101 transmission level polarized lights, reflection orthogonal polarized light;
Faraday polarization apparatus 102 (left-handed) changes 45 ° counterclockwise with the linear polarization polarization surface of horizontal polarization;
/ 2nd wave plates 103 change 45 ° (at first rotate 1/2nd wave plates 103, let θ equal 22.5 °) clockwise with the linear polarization polarization surface; Thereby behind horizontal linear polarization transmittance polaroid 101, process Faraday polarization apparatus 102 and 1/2nd wave plates 103, or horizontal polarization attitude;
Polaroid 104 transmission level linearly polarized lights (polaroid 104 transmission level polarized lights, reflection orthogonal polarized light);
Horizontal linear polarization light becomes circularly polarized light behind quarter-wave plate 105, carry out first Cheng Fangda (can at first rotate quarter-wave plate 105 and make its output circularly polarized light, then quarter-wave plate fixed) through amplifier 106;
Circularly polarized light is after catoptron 107 reflections, and sense of rotation changes but still is circularly polarized light, carries out second Cheng Fangda through amplifier 106 again;
Circularly polarized light becomes perpendicular linear polarization light through behind the quarter-wave plate 105 once more, after polaroid 104 reflections, arrives catoptron 108, through catoptron 108 reflections, polaroid 104 reflections, remains perpendicular linear polarization light again;
Perpendicular linear polarization light gets into quarter-wave plate 105, becomes circularly polarized light, carries out the 3rd Cheng Fangda through amplifier 106;
Circularly polarized light is after catoptron 107 reflections, and sense of rotation changes but still is circularly polarized light, carries out quadruple pass through amplifier 106 again and amplifies;
Circularly polarized light becomes horizontal linear polarization light through behind the quarter-wave plate, after polaroid 104 transmissions, through 1/2nd wave plates, 1/103rd, two wave plate 103 the polarization of incident light attitude is rotated counterclockwise 45 °;
Perpendicular linear polarization light is exported from the b direction from polaroid 101 reflections.
Concrete, when incident light is the horizontal polarization light time, its transmission first polarizer; It still is a horizontal polarization light through Faraday polarization apparatus and 1/2nd wave plates, transmission second polarizer, and horizontal polarization light becomes circularly polarized light behind quarter-wave plate; Circularly polarized light carries out first Cheng Fangda through amplifier, returns amplifier through first mirror reflects, carries out second Cheng Fangda through amplifier; Circularly polarized light becomes orthogonal polarized light through behind the quarter-wave plate, is reflected to second catoptron through second polarizer, is reflected back toward second polarizer through second catoptron; Be reflected to quarter-wave plate through second polarizer; Orthogonal polarized light gets into quarter-wave plate and becomes circularly polarized light, carries out the 3rd Cheng Fangda through amplifier, after mirror reflects, carries out quadruple pass through amplifier again and amplifies; Circularly polarized light becomes horizontal polarization light through quarter-wave plate; Transmission second polarizer oppositely is called orthogonal polarized light through 1/2nd wave plates and Faraday polarization apparatus, by first polarizer reflection output.
Said process makes light pass through amplifier four times, thereby realizes that quadruple pass amplifies.In addition, Faraday polarization apparatus 102 can also prevent that the laser after energy amplifies from oppositely penetrating from a direction, breaks the prime optical device, realizes the isolation of laser.
It will be understood by those skilled in the art that above-mentioned Faraday polarization apparatus 102 also can be to make the vibration plane/vibration vector of polarized light change 45 ° type clockwise, at this moment, oppositely gets final product 1/2 wave plate.Understand for ease, please refer to Fig. 3 b and 3c, wherein shown when utilizing clockwise Faraday polarization apparatus (being the dextrorotation Faraday polarization apparatus) and counterclockwise Faraday polarization apparatus (being left-handed Faraday polarization apparatus) polarization polarized state of light synoptic diagram respectively.
If the beam size of incident greater than the crystal diameter of amplifier, add a beam-shrinked mirror group between polaroid 101 and Faraday polarization apparatus 103, to the laser beam bundle that contracts.
According to a further embodiment of the invention, a kind of laser quadruple pass multiplying arrangement is provided, as shown in Figure 4.Be with the difference of embodiment shown in Figure 3, wherein also comprise the beam-shrinked mirror group 109 between light path upper polarizer 101 and Faraday polarization apparatus 103.
Another embodiment according to the present invention provides a kind of laser quadruple pass multiplying arrangement, and is as shown in Figure 5.Be that with the difference of embodiment shown in Figure 3 quarter-wave plate 105 is between amplifier 106 and catoptron 107.
Concrete light path is following, when incident light is the horizontal polarization light time, and its transmission first polarizer; It still is a horizontal polarization light through Faraday polarization apparatus and 1/2nd wave plates, transmission second polarizer, and horizontal polarization light carries out first Cheng Fangda through amplifier; Horizontal polarization light becomes circularly polarized light behind quarter-wave plate, return quarter-wave plate through first mirror reflects, and circularly polarized light becomes orthogonal polarized light through behind the quarter-wave plate; Carry out second Cheng Fangda through amplifier, be reflected to second catoptron, be reflected back toward second polarizer through second catoptron through second polarizer; Be reflected to amplifier through second polarizer, carry out the 3rd Cheng Fangda through amplifier, orthogonal polarized light gets into quarter-wave plate and becomes circularly polarized light; After mirror reflects, pass through quarter-wave plate again; Circularly polarized light gets into quarter-wave plate and becomes horizontal polarization light, gets into amplifier and carries out quadruple pass amplification, horizontal polarization transmittance second polarizer; Oppositely be called orthogonal polarized light, by first polarizer reflection output through 1/2nd wave plates and Faraday polarization apparatus.
In other embodiment of the present invention, the placing direction of polaroid 101 also can be as shown in Figure 6.
In other embodiment of the present invention, can also be as shown in Figure 7 at interpolation second amplifier 109 from light path, thus further improve enlargement factor.
In the foregoing description, as polarizer required in the light path, still in other embodiment of the present invention, also can use other types polarizer well known in the art to substitute with polaroid (for example polaroid 101,104).
The present invention proposes a kind of laser quadruple pass multiplying arrangement of compact conformation, when energy improves, saved the space, and the energy of laser instrument output is highly stable.Provided by the inventionly linearly polarized laser is carried out the device that quadruple pass amplifies also be suitable for being applied to compact conformation simultaneously in the exigent laser aid of laser enlargement factor.
Should be noted that and understand, under the situation that does not break away from the desired the spirit and scope of the present invention of accompanying Claim, can make various modifications and improvement the present invention of above-mentioned detailed description.Therefore, the scope of the technical scheme of requirement protection does not receive the restriction of given any specific exemplary teachings.
Claims (10)
1. laser quadruple pass multiplying arrangement comprises:
Be successively set on first polarizer, Faraday polarization apparatus, 1/2nd wave plates, second polarizer, quarter-wave plate, amplifier and first catoptron on the main optical path; And be arranged on second catoptron on the light path; This second catoptron is suitable for the polarized light vertical reflection from second polarizer is returned second polarizer, makes reflected light after second polarizer reflects once more, be coupled into main optical path;
Said first polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state; The polarization polarization surface of said first polarization state and second polarization state differs 90 degree;
Said Faraday polarization apparatus is left-handed Faraday polarization apparatus;
The incident light plane of oscillation of said 1/2nd wave plates and the angle between the optical axis of crystal are 22.5 degree; It is axis 45 degree that turn clockwise with the direct of travel of light that this 1/2nd wave plate is suitable for the plane of polarization of incident polarized light;
Said second polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state.
2. laser quadruple pass multiplying arrangement according to claim 1 also comprises:
The beam-shrinked mirror group is suitable for the beam size of input polarization light is narrowed down to the crystal diameter of amplifier.
3. laser quadruple pass multiplying arrangement according to claim 1 also comprises: second amplifier;
Between second polarizer of this second amplifier in second catoptron and main optical path from light path.
4. laser quadruple pass multiplying arrangement according to claim 1, wherein, the location swap of said quarter-wave plate and said amplifier.
5. laser quadruple pass multiplying arrangement according to claim 1, wherein, the location swap of said Faraday polarization apparatus and said 1/2nd wave plates.
6. laser quadruple pass multiplying arrangement comprises:
Be successively set on first polarizer, Faraday polarization apparatus, 1/2nd wave plates, second polarizer, quarter-wave plate, amplifier and first catoptron on the main optical path; And be arranged on second catoptron on the light path; This second catoptron is suitable for the polarized light vertical reflection from second polarizer is returned second polarizer, makes reflected light after second polarizer reflects once more, be coupled into main optical path;
Said first polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state; The polarization polarization surface of said first polarization state and second polarization state differs 90 degree;
Said Faraday polarization apparatus is the dextrorotation Faraday polarization apparatus;
The incident light plane of oscillation of said 1/2nd wave plates and the angle between the optical axis of crystal are 22.5 degree; It is that axis is rotated counterclockwise 45 degree with the direct of travel of light that this 1/2nd wave plate is suitable for the plane of polarization of incident polarized light;
Said second polarizer is suitable for the polarized light of transmission first polarization state, reflects the polarized light of second polarization state.
7. laser quadruple pass multiplying arrangement according to claim 6 also comprises:
The beam-shrinked mirror group is suitable for the beam size of input polarization light is narrowed down to the crystal diameter of amplifier.
8. laser quadruple pass multiplying arrangement according to claim 6 also comprises: second amplifier;
Between second polarizer of this second amplifier in second catoptron and main optical path from light path.
9. laser quadruple pass multiplying arrangement according to claim 6, wherein, the location swap of said quarter-wave plate and said amplifier.
10. laser quadruple pass multiplying arrangement according to claim 6, wherein, the location swap of said Faraday polarization apparatus and said 1/2nd wave plates.
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| CN2012100777105A CN102621704A (en) | 2012-03-22 | 2012-03-22 | Four-pass laser amplifying device |
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| CN2012100777105A CN102621704A (en) | 2012-03-22 | 2012-03-22 | Four-pass laser amplifying device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050876A (en) * | 2013-01-05 | 2013-04-17 | 中国科学院合肥物质科学研究院 | Linearly polarized laser amplifier |
| CN103259184A (en) * | 2013-04-19 | 2013-08-21 | 中国科学院上海光学精密机械研究所 | Repetition frequency neodymium glass laser |
| CN106646757A (en) * | 2017-03-07 | 2017-05-10 | 昂纳信息技术（深圳）有限公司 | Multiplexer and light-combining method thereof |
| CN108680511A (en) * | 2018-05-18 | 2018-10-19 | 南京信息工程大学 | A kind of reflection enhancement type polarimeter based on circularly polarized light |
| CN110190492A (en) * | 2019-04-11 | 2019-08-30 | 北京盛镭科技有限公司 | Laser amplifier |
| CN112285938A (en) * | 2020-11-10 | 2021-01-29 | 北京工业大学 | Device and method for generating singular hollow beams |
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| US5268787A (en) * | 1993-02-17 | 1993-12-07 | Energy Compression Research Corp. | Multiple-pass method and apparatus for laser amplification |
| US6384966B1 (en) * | 1999-11-03 | 2002-05-07 | Time-Bandwidth Products Ag | Multiple pass optical amplifier with thermal birefringence compensation |
| CN2901639Y (en) * | 2006-03-23 | 2007-05-16 | 北京工业大学 | Laser pulse four-way amplifier |
| CN101499609A (en) * | 2009-03-13 | 2009-08-05 | 北京工业大学 | Light path structure for cascade bi-pass laser amplifier |
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| US5268787A (en) * | 1993-02-17 | 1993-12-07 | Energy Compression Research Corp. | Multiple-pass method and apparatus for laser amplification |
| US6384966B1 (en) * | 1999-11-03 | 2002-05-07 | Time-Bandwidth Products Ag | Multiple pass optical amplifier with thermal birefringence compensation |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050876A (en) * | 2013-01-05 | 2013-04-17 | 中国科学院合肥物质科学研究院 | Linearly polarized laser amplifier |
| CN103259184A (en) * | 2013-04-19 | 2013-08-21 | 中国科学院上海光学精密机械研究所 | Repetition frequency neodymium glass laser |
| CN103259184B (en) * | 2013-04-19 | 2015-03-25 | 中国科学院上海光学精密机械研究所 | Repetition frequency neodymium glass laser |
| CN106646757A (en) * | 2017-03-07 | 2017-05-10 | 昂纳信息技术（深圳）有限公司 | Multiplexer and light-combining method thereof |
| CN106646757B (en) * | 2017-03-07 | 2021-01-26 | 昂纳信息技术（深圳）有限公司 | Multiplexer and light combination method thereof |
| CN108680511A (en) * | 2018-05-18 | 2018-10-19 | 南京信息工程大学 | A kind of reflection enhancement type polarimeter based on circularly polarized light |
| CN108680511B (en) * | 2018-05-18 | 2023-08-25 | 南京信息工程大学 | Reflection enhancement type polarimeter based on circularly polarized light |
| CN110190492A (en) * | 2019-04-11 | 2019-08-30 | 北京盛镭科技有限公司 | Laser amplifier |
| CN112285938A (en) * | 2020-11-10 | 2021-01-29 | 北京工业大学 | Device and method for generating singular hollow beams |
| CN112285938B (en) * | 2020-11-10 | 2023-01-31 | 北京工业大学 | Device and method for generating singular hollow beams |
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Application publication date: 20120801 |