CN104102015A - Radial-polarization-light generation device and laser processing system - Google Patents
Radial-polarization-light generation device and laser processing system Download PDFInfo
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- CN104102015A CN104102015A CN201310121118.5A CN201310121118A CN104102015A CN 104102015 A CN104102015 A CN 104102015A CN 201310121118 A CN201310121118 A CN 201310121118A CN 104102015 A CN104102015 A CN 104102015A
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Abstract
The invention is applicable to the technical field of optics and provides a radial-polarization-light generation device and a laser processing system. 2n (n is an integer larger than or equal to 1) half-wave plates form the radial-polarization-light generation device. Slow axes of the half-wave plates are all parallel to cross sections of the half-wave plates so that the structure is significantly simple and manufacturing is simple. The plurality of half-wave plates are used to control the polarization state of incident light at the same time, that is, the polarization state of the cross sections of light beams is re-modulated in space so that the light beams are distributed in an approximately anisotropic manner and thus an effect of radial polarization is achieved and radial polarization light is generated, and theoretically, complete radial polarization can be achieved. Moreover, the purity of the generated radial polarization light is determined by the number (2n) of the haft-wave plates so that the purity of the radial polarization light can be improved as needed.
Description
Technical field
The invention belongs to optical technical field, relate in particular to a kind of radial polarisation light generating device and laser-processing system.
Background technology
Radial polarized light beam is a kind of novelty, the polarized light pattern of form uniqueness, and its polarization mechanism is different from traditional liner polarization and circular polarization.For linearly polarized light beam and circularly polarized light beam, on beam cross-section, the vibration of any point electric field intensity is all consistent, and direction is identical, and size is identical, and therefore this polarization state is isotropy polarization state; And radial polarized light beam, on cross section the vibration of any point electric field intensity inconsistent, size is identical, and direction difference, this is a kind of anisotropic polarization state.Radial polarized light beam is a kind of important kind of rotational symmetry light beam.For rotational symmetry light beam, its outstanding feature is: on beam cross-section, any point electric field intensity direction remains unchanged with angle radially.The electric field intensity of radial polarized light beam on xsect all the time with radial parallel.
Radial polarized light beam, due to its unique polarization form and remarkable beam characteristics, has caused people's very big interest in scientific research and industry member, in the hard-core technologies such as cut, particle acceleration, optical microphotograph, has boundless application prospect.For example: the parameter of laser cut metal depends on the polarization characteristic of light beam to a great extent.In order to meet industrial needs, must be axisymmetric and maximum in the absorptive rate of radiation on processing metal surface.People replace traditional linearly polarized light beam with circularly polarized light beam, thereby have obtained the effect of current best laser cut metal.Studies show that, adopt efficiency that radial polarized light beam carries out laser cut metal to be while adopting circularly polarized light beam 2 times.But existing radial polarisation light generating device complex structure, and to produce radial polarisation optical purity lower.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of radial polarisation light generating device, is intended to solve the baroque problem of existing radial polarisation light generating device.
The embodiment of the present invention is achieved in that a kind of radial polarisation light generating device, comprises 2n half-wave plate, and the slow axis of each half-wave plate is all parallel to its xsect, and wherein n is more than or equal to 1 integer.
Another object of the embodiment of the present invention is to provide a kind of laser-processing system that adopts above-mentioned radial polarisation light generating device.
The embodiment of the present invention is to be more than or equal to 1 integer by 2n(n) individual half-wave plate formation radial polarisation light generating device, the slow axis of each half-wave plate is all parallel to its xsect, and structure is extremely simple, is easy to make.Utilize multiple half-wave plates the polarization state of incident light to be controlled at this simultaneously, spatially again modulate by polarization state on beam cross section, making it present a kind of approximate anisotropic polarization distributes, thereby reach the effect of radial polarisation, produce thus radial polarisation light, and can reach complete radial polarisation in theory.In addition, the purity of radial polarisation light that produces determined by the number of half-wave plate (2n), so can improve as required the purity of radial polarisation light.
Brief description of the drawings
Fig. 1 is that linearly polarized light passes through after existing half-wave plate, and light beam polarization face is subject to the schematic diagram that modulation deflects;
Fig. 2 is the structural representation (be made up of 8 blocks of half-wave plates, and between adjacent half-wave plate, the angle of slow axis being 22.5 °) of the radial polarisation light generating device that provides of the embodiment of the present invention;
Fig. 3 is the structural representation of 0 ° of half-wave plate providing of the embodiment of the present invention;
Fig. 4 is the radial polarisation light generating device slow axis distribution plan that the embodiment of the present invention provides;
Fig. 5 is the polarisation distribution schematic diagram of outgoing beam after the linearly polarized light SVR that passes through to be made up of 8 blocks of half-wave plates;
It is enough large that Fig. 6 is that linearly polarized light passes through SVR(n) after the polarisation distribution schematic diagram of outgoing beam.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention is to be more than or equal to 1 integer by 2n(n) individual half-wave plate formation radial polarisation light generating device, the slow axis of each half-wave plate is all parallel to its xsect, and structure is extremely simple, is easy to make.Utilize multiple half-wave plates the polarization state of incident light to be controlled at this simultaneously, spatially again modulate by polarization state on beam cross section, making it present a kind of approximate anisotropic polarization distributes, thereby reach the effect of radial polarisation, produce thus radial polarisation light, and can reach complete radial polarisation in theory.In addition, the purity of radial polarisation light that produces determined by the number of half-wave plate (2n), so can improve as required the purity of radial polarisation light.
As an example of n=4 example, realization of the present invention is described in detail below.
It should be noted that at this half-wave plate (phase delay device) is as a kind of conventional polarizer, it can be made up of kinds of artificial or natural birefringence crystal, is often used to change the polarization state of incident beam.Half-wave plate can make the o light propagated therein and e light produce the relative phase shift of a π, and it can, by a specific angle of plane of polarization rotation of the linearly polarized light of incident, often be used as Polarization Control device at laser technology field.If the existing half-wave plate of a branch of linearly polarized light incident, the angle of light beam polarization face and wave plate slow axis is φ (as 45 °), and after this wave plate modulation, light beam polarization face will rotate taking wave plate slow axis as axis of symmetry 2 φ (as 90 °), as shown in Figure 1.
If the xsect of radial polarisation light is radially divided into m part, in the time that m is enough large, the polarization form of every portion can be regarded direction linear polarization radially as, and therefore radial polarisation light can be regarded the unlimited many parts of polarization directions radially cut apart linearly polarized light radially as and combines.The embodiment of the present invention is utilized polylith half-wave plate, and adjacent half-wave plate slow-axis direction is in a certain angle each other, incident light by time, be subject on spatial modulation beam cross section linear polarization no longer single, but the parallel alley that points to approx cross section to.In the time that the half-wave plate using is more, the polarization state of outgoing beam more approaches radial polarisation.
As shown in Fig. 2～4, the radial polarisation light generating device that the embodiment of the present invention provides comprises that 2n half-wave plate 1(n is more than or equal to 1 integer), the slow axis of each half-wave plate 1 is parallel to its xsect, and structure is extremely simple, is easy to make.Utilize multiple half-wave plates 1 polarization state of incident light to be controlled at this simultaneously, spatially again modulate by polarization state on beam cross section, making it present a kind of approximate anisotropic polarization distributes, thereby reach the effect of radial polarisation, produce thus radial polarisation light, and can reach complete radial polarisation in theory.In addition, the purity of the radial polarisation light that produces is determined by the number (2n) of half-wave plate 1, so can improve as required the purity of radial polarisation light.
Above-mentioned each half-wave plate 1 slow axis is in same plane, and the angle ω of 1 slow axis of adjacent half-wave plate is preferably 90 °/n, so that the radial polarisation optical purity producing is higher.Further, clockwise or counterclockwise, the angle between the slow axis of one of them half-wave plate and the slow axis of all the other each half-wave plates is ω, 2 ω, 3 ω ... M ω, M is more than or equal to 1 integer, so that polarization state is spatially modulated evenly.Make the slow axis of one of them half-wave plate parallel with its point angle angular bisector herein, be beneficial to like this orientation of adjusting this radial polarisation light generating device, make the slow axis of this half-wave plate and the polarization direction of incident ray polarized light consistent.
As preferably, the xsect of each half-wave plate 1 is fan-shaped, the cylindric radial polarisation light generating device of sequentially bonding formation of the radial side of 2n half-wave plate 1, or be referred to as λ/2 wave plate (spatially variable retarder, SVR) of spatial variations.When n=4, form cylindric radial polarisation light generating device by 8 measure-alike half-wave plates 1 by its side is sequentially bonding, and make the angle ω=90 °/4=22.5 ° of 1 slow axis of adjacent half-wave plate.
As shown in Fig. 3～5, the embodiment of the present invention is parallel to the half-wave plate of point angle 2 angular bisectors 3 as 0 ° of half-wave plate using slow axis, make the polarization direction of incident ray polarized light identical with described 0 ° of half-wave plate slow-axis direction, can make both directions identical by rotating whole radial polarisation light generating device herein.And clockwise or counterclockwise, the slow axis of the slow axis of all the other half-wave plates and described 0 ° of half-wave plate differs respectively ω=22.5 °, 2 ω=45 °, 3 ω=67.5 ° n ω or-ω=-22.5,-2 ω=-45 °,-3 ω=-67.5 °-n ω, between adjacent like this half-wave plate, the angle of slow axis is ω=22.5 °, as shown in Figure 4.
Particularly, in the time that incident ray polarized light passes through SVR, only need rotation SVR, just can make light beam polarization direction identical with 0 ° of half-wave plate slow-axis direction, and diverse location is subject to the modulation of different wave plates on cross section, therefore the polarization state of outgoing beam changes along with the spatial variations of half-wave plate.Outgoing beam polarization state should be such: the cross-sectional area that is subject to same half of wave plate modulation, polarization direction is parallel to this half-wave plate point angle angular bisector, Fig. 5 shows linearly polarized light by the polarisation distribution of outgoing beam after the SVR being made up of 8 (when n=4) half-wave plates, can find out that this polarization state and radial polarisation state are very close.N is larger, and outgoing beam polarization state more approaches radial polarisation, Fig. 6 show n when enough large outgoing beam polarization state distribute.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a radial polarisation light generating device, is characterized in that, described generation device comprises 2n half-wave plate, and the slow axis of each half-wave plate is all parallel to its xsect, and wherein n is more than or equal to 1 integer.
2. radial polarisation light generating device as claimed in claim 1, is characterized in that, angle ω=90 of slow axis ° between adjacent half-wave plate/n.
3. radial polarisation light generating device as claimed in claim 2, is characterized in that, clockwise or counterclockwise, the angle between the slow axis of one of them half-wave plate and the slow axis of all the other each half-wave plates is ω, 2 ω, 3 ω ... M ω, M is more than or equal to 1 integer.
4. the radial polarisation light generating device as described in any one in claim 1～3, is characterized in that, the slow axis of one of them half-wave plate is parallel with its point angle angular bisector.
5. radial polarisation light generating device as claimed in claim 4, is characterized in that, is parallel to the half-wave plate of point angle angular bisector as 0 ° of half-wave plate using slow axis, and the polarization direction of incident ray polarized light is identical with described 0 ° of half-wave plate slow-axis direction.
6. the radial polarisation light generating device as described in claim 1,2,3 or 5 any one, is characterized in that, the xsect of each half-wave plate is fan-shaped, the cylindric radial polarisation light generating device of sequentially bonding formation of the radial side of 2n half-wave plate.
7. radial polarisation light generating device as claimed in claim 4, is characterized in that, the xsect of each half-wave plate is fan-shaped, the cylindric radial polarisation light generating device of sequentially bonding formation of the radial side of 2n half-wave plate.
8. the laser-processing system of the employing radial polarisation light generating device as described in any one in claim 1～7.
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| CN201310121118.5A CN104102015A (en) | 2013-04-09 | 2013-04-09 | Radial-polarization-light generation device and laser processing system |
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Cited By (5)
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| CN104793344A (en) * | 2015-05-07 | 2015-07-22 | 中国科学院光电技术研究所 | Polarization conversion device |
| CN105436704A (en) * | 2016-01-12 | 2016-03-30 | 上海理工大学 | Double processing head laser processing device based on radial polarization beams |
| CN107014803A (en) * | 2017-06-06 | 2017-08-04 | 中国计量大学 | A kind of Raman spectrum detecting device |
| CN107783308A (en) * | 2017-10-30 | 2018-03-09 | 福建福晶科技股份有限公司 | A kind of broadband radial polarisation converter |
| CN108957089A (en) * | 2018-07-13 | 2018-12-07 | 福州大学 | A kind of optical voltage transformer realized based on combination half-wave plate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105436704A (en) * | 2016-01-12 | 2016-03-30 | 上海理工大学 | Double processing head laser processing device based on radial polarization beams |
| CN107014803A (en) * | 2017-06-06 | 2017-08-04 | 中国计量大学 | A kind of Raman spectrum detecting device |
| CN107014803B (en) * | 2017-06-06 | 2019-09-27 | 中国计量大学 | A Raman spectroscopy detection device |
| CN107783308A (en) * | 2017-10-30 | 2018-03-09 | 福建福晶科技股份有限公司 | A kind of broadband radial polarisation converter |
| CN108957089A (en) * | 2018-07-13 | 2018-12-07 | 福州大学 | A kind of optical voltage transformer realized based on combination half-wave plate |
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Application publication date: 20141015 |