CN104317063A - W-shaped combined mirror structure used for azimuthal polarization selection - Google Patents
W-shaped combined mirror structure used for azimuthal polarization selection Download PDFInfo
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- CN104317063A CN104317063A CN201410489916.8A CN201410489916A CN104317063A CN 104317063 A CN104317063 A CN 104317063A CN 201410489916 A CN201410489916 A CN 201410489916A CN 104317063 A CN104317063 A CN 104317063A
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- reflecting surface
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- 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
- G02B27/285—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 comprising arrays of elements, e.g. microprisms
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Abstract
The invention belongs to the technical field of optics, and particularly relates to a W-shaped combined mirror structure used for azimuthal polarization selection. The W-shaped combined mirror structure comprises an annular reflecting mirror and a W-shaped tapered mirror. The center of the annular reflecting mirror is provided with an incidence hole. The reflecting surface of the W-shaped tapered mirror is composed of an outer tapered reflecting surface in the central region and an inner tapered reflecting surface in the peripheral region. The annular reflecting surface of the annular reflecting mirror and the inner tapered reflecting surface are arranged oppositely. The annular reflecting surface, the inner tapered reflecting surface and the outer tapered reflecting surface are sequentially connected into a multi-reflection combined structure which is hollow inside. The taper angles of the outer tapered reflecting surface and the inner tapered reflecting surface are 90 degrees. The W-shaped combined mirror structure used for azimuthal polarization selection has the advantages of simple structure, good symmetry, strong anti-imbalance ability, excellent thermal stability and mechanical performance, simple manufacture and low cost, and can be widely used in gas, solid and semiconductor lasers to generate high-power and high-purity azimuthally polarized light.
Description
Technical field
The invention belongs to optical technical field, being specifically related to a kind of for selecting the W shape combined lens structure of angle polarization.
Background technology
Angle polarized light is a kind of annular beam, and on ring, the polarization direction of any point is all perpendicular to radial direction, carries out process can obtain angle polarized light to the laser beam of laser instrument output.Due to the particular polarization vector structure of angle polarized light, it is made to obtain application in a lot of field.At field of scientific study, angle polarized light can be used for guiding atom.Under strong focusing, angle polarized light also can realize particle-capture as " light tweezers ".Angle polarized light can also be used for two-photon fluorescence imaging, breaks through diffraction limit, improves resolution.In industrial processes field, angle polarized light can be used for punching and welding, to improve punching and the depth of weld; Angle polarized light also becomes radial polarisation light, to improve cutting speed and crudy by outer optical system conversion.
At present, the generation of angle polarized light is divided into passive and active two kinds of modes.Passive mode mainly adopts element such as combination wave plate, grating etc. to make spatial rearrangement to the linearly polarized light that laser instrument produces, or uses the TEM of a pair polarized orthogonal
01light beam coherence stack obtains.The vibration that active mode generally adopts the polarization selection element such as birefringece crystal or circular grating mirror to realize angle polarized light in laserresonator exports.Compared to passive method, active method transformation efficiency is high, can realize high-power output.Experimental study shows, adopts active method to obtain angle polarized light, only needs polarization selector at least high by 4% than P polarization light reflectance to S polarization light reflectance, just can obtain highly purified angle polarized light.But the production method due to birefringece crystal needs to coordinate the other technologies such as mode selection by pinhole, and implement poor stability, the angle polarized light polarization purity obtained is not high; And grating mirror designs and produces complexity, price comparison is expensive.
Summary of the invention
Object of the present invention is exactly the deficiency existed to solve above-mentioned background technology, providing the W shape combined lens structure for selecting angle polarization that a kind of structure is simple, cost is low, can produce highly purified angle polarized light when being applied to laser instrument.
The technical solution used in the present invention is: a kind of for selecting the W shape combined lens structure of angle polarization, comprise the Perimeter Truss Reflector and W shape axicon lens that Rotational Symmetry is arranged centered by optical axis that be fixed together, described Perimeter Truss Reflector center has entrance aperture, the inner face of described Perimeter Truss Reflector is provided with toroidal reflective surface, the reflecting surface of described W shape axicon lens is made up of the inner cone reflecting surface of the outer cone reflecting surface and outer region that are positioned at middle section, described toroidal reflective surface and inner cone reflecting surface positioned opposite, described toroidal reflective surface, inner cone reflecting surface and outer cone reflecting surface connect successively and form the multiple reflections unitized construction of inner hollow, the cone angle of described outer cone reflecting surface and inner cone reflecting surface is 90 degree.
Further, described toroidal reflective surface, outer cone reflecting surface and inner cone reflecting surface are coated with golden film respectively.
Further, described toroidal reflective surface is the plane perpendicular to optical axis.
Further, described toroidal reflective surface is sphere or the concave surface of larger radius of curvature.
Further, the radius-of-curvature of described sphere or concave surface is 10-30m.
Further, the described outer cone reflecting surface of W shape axicon lens and the junction of inner cone reflecting surface are provided with transitional region.
Further, described transitional region is the planar annular perpendicular to optical axis.
Further, described transitional region be respectively with outer cone reflecting surface and the tangent annular cambered surface of inner cone reflecting surface.
Further, described Perimeter Truss Reflector and W shape axicon lens are the metal bronze mirror with high reflectance.
The present invention makes full use of the reflectivity of metal conical reflector to S polarized light and is higher than feature to P-polarization light reflectance, the multiple reflections unitized construction of a hollow is formed by a toroidal reflective surface and two conical reflecting surfaces, after laser beam injects combined lens, in combined lens, multiple reflections Hou Zaianyuan road returns outside injection, through after the repeatedly conical reflecting in combined lens, S polarized light keeps very high reflectivity, P-polarized light then loss is comparatively large, finally can starting of oscillation the polarization state maintained just only has angle polarization in laserresonator.This combined lens is used as resonator cavity tail mirror, just in chamber, effectively can suppresses P-polarized light, and only allow S polarized light form vibration, thus play the effect of angle polarization selection.
Tail mirror assembly structure of the present invention is simple, polarization selectivity is good, antibody Monoclonal threshold value is high, symmetry good, anti-imbalance ability is strong, thermal stability and good mechanical performance, make simple, cost is low, can be widely used in gas, solid and semiconductor laser and produce high power, highly purified angle polarized light.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of Perimeter Truss Reflector of the present invention.
Fig. 3 is the side view of Perimeter Truss Reflector of the present invention.
Fig. 4 is the structural representation of W shape axicon lens of the present invention.
Fig. 5 is the side view of W shape axicon lens of the present invention.
Fig. 6 is metal bronze mirror to the graph of relation of S polarized light and P-polarized light reflectivity and incident angle.
1, Perimeter Truss Reflector; 2, W shape axicon lens; 3, entrance aperture; 4, toroidal reflective surface; 5, outer cone reflecting surface; 6, inner cone reflecting surface; 7, optical axis; 8, laser beam; 9, planar annular.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As Figure 1-5, the present invention includes is fixed together be centrosymmetric arrange Perimeter Truss Reflector 1 and W shape axicon lens 2, wherein, Perimeter Truss Reflector 1 central area has entrance aperture 3, as the entrance of laser beam 8, the inner of Perimeter Truss Reflector 1 is provided with toroidal reflective surface 4, toroidal reflective surface 4 can be the plane vertical with optical axis 7, also can be sphere or the concave surface of larger radius of curvature, when its be sphere or concave surface time, range of curvature radius is selected in 10-30m, has good stability; Toroidal reflective surface 4 has high reflectance, and when incident angle is 0 degree, reflectivity and the P-polarization light reflectance of S polarized light do not have difference.The center section of W shape axicon lens 2 is outer wimble structure, outer peripheral portion is interior wimble structure, its reflecting surface is made up of the inner cone reflecting surface 6 of the outer cone reflecting surface 5 and outer region that are positioned at middle section, outer cone reflecting surface 5 is provided with the junction of inner cone reflecting surface 6 transitional region 9 that a width is D, transitional region 9 can be the planar annular vertical with optical axis, also can be respectively with outer cone reflecting surface 5 and the tangent annular cambered surface of inner cone reflecting surface 6, the setting in this region is mainly in order to reduce the difficulty of processing, the width of this transitional region can require according to processing technology and suitably adjust, so that make.Outer cone reflecting surface 5 and inner cone reflecting surface 6 are the plane had for high reflectance, toroidal reflective surface 4 and inner cone reflecting surface 5 are installed together in mode positioned opposite, toroidal reflective surface 4, outer cone reflecting surface 5 and inner cone reflecting surface 6 form the multiple reflections unitized construction of inner hollow, and three is Rotational Symmetry centered by optical axis 7.For ensureing that incident light can penetrate along former road direction outward, the cone angle of outer cone reflecting surface 5 and inner cone reflecting surface 6 is 90 degree, namely incident ray vertical with toroidal reflective surface 4, and the angle of outer cone reflecting surface 5 and inner cone reflecting surface 6 be 45 °.The cone angle of outer cone reflecting surface 5 and inner cone reflecting surface 6 is not limited to 90 degree, and both also can reach effect same in supplementary angle each other.
Perimeter Truss Reflector 1 and W shape axicon lens 2 are the metal bronze mirror with high reflectance, and the reflectivity of toroidal reflective surface 4, outer cone reflecting surface 5 and inner cone reflecting surface 6 pairs of S polarized lights wants a little higher than P-polarization light reflectance.Can at toroidal reflective surface 4, outer cone reflecting surface 5 and inner cone reflecting surface 6 surface gold-plating film, improve laser reflectivity further, also can plate other particular polarization selective membranes, increase the reflectivity difference of S polarized light and P-polarized light, to improve polarization selective power.
Increase along with the conical reflecting number of times in combined lens is become large by the reflectivity difference of S polarized light and P-polarized light.And conical reflecting number of times adjusts by structural parameters A, B, C, D of combined lens, wherein, A is the width of toroidal reflective surface 4, and B is the height of inner cone reflecting surface 6, and C is the height of outer cone reflecting surface 5, and D is the width of planar annular 9.In the present embodiment example, will there are 5 secondary reflections after entering this combined lens from the entrance aperture of Perimeter Truss Reflector in laser beam 8, then penetrate outward by former road direction successively between internal reflection surface (5,6,4,6,5).Wherein, for 1 secondary reflection occurred in toroidal reflective surface 4, its incident angle is zero, and therefore, S polarized light and P-polarization light reflectance do not have difference; And for 2 secondary reflections occurred each on outer cone reflecting surface 5 and inner cone reflecting surface 6, its incident angle is 45 degree, therefore, the reflectivity of S polarized light is higher than P-polarization light reflectance, and the reflectivity difference of these two kinds of polarized lights becomes large along with the increase of conical reflecting number of times.
Metal bronze mirror is to S polarized light and the P-polarization light reflectance change curve with incident angle, and the mathematic(al) representation of these two kinds of polarized light reflectivity is respectively: R
s=((n-cos θ)
2+ k
2)/((n+cos θ)
2+ k
2) and R
p=((n-sec θ)
2+ k
2)/((n+sec θ)
2+ k
2), wherein, θ is incident angle, n and k is respectively real part and the imaginary part of reflecting surface Refractive Index of Material.For plane reflection bronze mirror, when incidence angle θ=0 °, S polarized light and P-polarization light reflectance do not have difference.And for the inner cone catoptron of same metal copper material and outer cone catoptron, when incidence angle θ=45 °, now can obviously find out from Fig. 6, the reflectivity of S polarized light is higher than P-polarization light reflectance, i.e. R
s> R
p.Therefore, when S polarized light and P-polarized light are after the metal conical surface m secondary reflection of combinations thereof mirror, its total reflectivity is just respectively
with
namely the reflectivity difference of two kinds of polarized lights is increasing by the increase along with order of reflection.This combined lens is used as resonator cavity tail mirror, just in chamber, effectively can suppresses P-polarized light, and only allow S polarized light form vibration, thus play the effect of angle polarization selection.
The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (9)
1. one kind for selecting the W shape combined lens structure of angle polarization, it is characterized in that: comprise the Perimeter Truss Reflector (1) and W shape axicon lens (2) that Rotational Symmetry is arranged centered by optical axis that be fixed together, described Perimeter Truss Reflector (1) center has entrance aperture (3), the inner face of described Perimeter Truss Reflector (1) is provided with toroidal reflective surface (4), the reflecting surface of described W shape axicon lens (2) is made up of the inner cone reflecting surface (6) of the outer cone reflecting surface (5) and outer region that are positioned at middle section, the toroidal reflective surface (4) of Perimeter Truss Reflector (1) is positioned opposite with inner cone reflecting surface (6), described toroidal reflective surface (4), inner cone reflecting surface (6) and outer cone reflecting surface (5) connect successively and form the multiple reflections unitized construction of inner hollow, the cone angle of described outer cone reflecting surface (5) and inner cone reflecting surface (6) is 90 degree.
2. according to claim 1 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: described toroidal reflective surface (4), outer cone reflecting surface (5) and inner cone reflecting surface (6) are coated with golden film respectively.
3. according to claim 1 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: described toroidal reflective surface (4) is the plane perpendicular to optical axis.
4. according to claim 1 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: described toroidal reflective surface (4) is sphere or concave surface.
5. according to claim 4 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: the radius-of-curvature of described sphere or concave surface is 10-30m.
6. according to claim 1 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: between the outer cone reflecting surface (5) of described W shape axicon lens (2) and inner cone reflecting surface (6), be provided with transitional region (9).
7. according to claim 6 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: described transitional region (9) is the planar annular perpendicular to optical axis.
8. according to claim 6 a kind of for selecting the W shape combined lens structure of angle polarization, it is characterized in that: described transitional region (9) be respectively with outer cone reflecting surface (5) and the tangent annular cambered surface of inner cone reflecting surface (6).
9. any according to claim 1-8, for selecting the laser tail mirror assembly of angle polarization, is characterized in that: described Perimeter Truss Reflector (1) and W shape axicon lens (2) are the metal bronze mirror with high reflectance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410489916.8A CN104317063A (en) | 2014-09-23 | 2014-09-23 | W-shaped combined mirror structure used for azimuthal polarization selection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410489916.8A CN104317063A (en) | 2014-09-23 | 2014-09-23 | W-shaped combined mirror structure used for azimuthal polarization selection |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201373948Y (en) * | 2009-01-22 | 2009-12-30 | 上海理工大学 | Beam polarization state converting and regulating system |
| US20120320458A1 (en) * | 2010-02-25 | 2012-12-20 | The United States Of America, As Represented By The Secretary, Department Of Health And Human Serv | Azicon beam polarization devices |
| CN103326224A (en) * | 2013-06-19 | 2013-09-25 | 中国科学技术大学 | Radial polarization beam laser |
-
2014
- 2014-09-23 CN CN201410489916.8A patent/CN104317063A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201373948Y (en) * | 2009-01-22 | 2009-12-30 | 上海理工大学 | Beam polarization state converting and regulating system |
| US20120320458A1 (en) * | 2010-02-25 | 2012-12-20 | The United States Of America, As Represented By The Secretary, Department Of Health And Human Serv | Azicon beam polarization devices |
| CN103326224A (en) * | 2013-06-19 | 2013-09-25 | 中国科学技术大学 | Radial polarization beam laser |
Non-Patent Citations (1)
| Title |
|---|
| MASAMORI ENDO: "Azimuthally polarized 1 kW CO2 laser with a triple-axicon retroreflector optical resonator", 《OPTICS LETTERS》 * |
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Application publication date: 20150128 |