CN204360025U - A kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization - Google Patents
A kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization Download PDFInfo
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- CN204360025U CN204360025U CN201420548675.5U CN201420548675U CN204360025U CN 204360025 U CN204360025 U CN 204360025U CN 201420548675 U CN201420548675 U CN 201420548675U CN 204360025 U CN204360025 U CN 204360025U
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Abstract
The utility model belongs to optical technical field, is specifically related to a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization.It comprises the V-arrangement axicon lens and W shape axicon lens that are fixed together and are centrosymmetric and arrange, V-arrangement axicon lens center has entrance aperture, the reflecting surface of V-arrangement axicon lens is made up of male cone (strobilus masculinus) and inner conical surface, the reflecting surface of 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, male cone (strobilus masculinus) and inner conical surface are positioned opposite with inner cone reflecting surface respectively, male cone (strobilus masculinus), inner conical surface, outer cone reflecting surface and inner cone reflecting surface form the multiple reflections unitized construction of inner hollow, and the cone angle of male cone (strobilus masculinus), inner conical surface, outer cone reflecting surface and inner cone reflecting surface is 90 °.The utility model structure is simple, and symmetry is good, anti-imbalance ability is strong, thermal stability and good mechanical performance, and make simple, cost is low, can be widely used in gas, solid and semiconductor laser and produce high power, highly purified angle polarized light.
Description
Technical field
The utility model belongs to optical technical field, is specifically related to a kind of for selecting V-arrangement and 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.
Utility model content
The purpose of this utility model is exactly the deficiency existed to solve above-mentioned background technology, providing a kind of structure is simple, cost is low V-arrangement and W shape combined lens structure for selecting angle polarization, can produce highly purified angle polarized light when being applied to laser instrument.
The technical solution adopted in the utility model is: a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization, comprise the ring-type V-arrangement axicon lens and W shape axicon lens that Rotational Symmetry is arranged centered by optical axis that be fixed together, described V-arrangement axicon lens center has entrance aperture, the reflecting surface of described V-arrangement axicon lens is made up of male cone (strobilus masculinus) and inner conical 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 male cone (strobilus masculinus) and inner conical surface are positioned opposite with inner cone reflecting surface respectively, described male cone (strobilus masculinus), inner conical surface, outer cone reflecting surface and inner cone reflecting surface form the multiple reflections unitized construction of inner hollow, described male cone (strobilus masculinus), inner conical surface, the cone angle of outer cone reflecting surface and inner cone reflecting surface is 90 °.
Further, described male cone (strobilus masculinus), inner conical surface, inner cone reflecting surface and outer cone reflecting surface are coated with golden film respectively.
Further, the described outer cone reflecting surface of W shape axicon lens and the junction of inner cone reflecting surface are provided with planar annular.
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 V-arrangement axicon lens and W shape axicon lens are the metal bronze mirror with high reflectance.
The utility model 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 combined lens structure of an inner hollow is formed by the V-arrangement reflecting surface formed by two conical surfaces and the W shape reflecting surface formed by two V-arrangement conical surfaces, after laser beam injects combined lens, outwards penetrate along being parallel to incident light direction again after multiple reflections in combined lens, through after the repeatedly conical reflecting in combined lens, S polarized light keeps very high reflectivity, P-polarized light then loss is larger, final can in laserresonator starting of oscillation and maintain polarization state just only have angle polarization.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 utility model 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 utility model.
Fig. 2 is the structural representation of the utility model V-arrangement axicon lens.
Fig. 3 is the side view of the utility model V-arrangement axicon lens.
Fig. 4 is the structural representation of the utility model W shape axicon lens.
Fig. 5 is the side view of the utility model W shape axicon lens.
Fig. 6 is another kind of structural representation of the present utility model.
In figure: 1, V-arrangement axicon lens; 2, W shape axicon lens; 3, entrance aperture; 4, male cone (strobilus masculinus); 5, inner conical surface; 6, outer cone reflecting surface; 7, inner cone reflecting surface; 8, optical axis; 9, laser beam; 10, planar annular.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, is convenient to be well understood to the utility model, but they do not form restriction to the utility model.
As Figure 1-5, combined lens structure of the present utility model comprises the V-arrangement axicon lens 1 of ring-type and W shape axicon lens 2 that are fixed together and are centrosymmetric and arrange, wherein, V-arrangement axicon lens 1 is wimble structure in annular, its central area has entrance aperture 3, as the entrance of laser beam 9, the V-arrangement reflecting surface of its ring-type is made up of male cone (strobilus masculinus) 4 and inner conical surface 5; The center section of W shape axicon lens 2 is outer wimble structure, outer peripheral portion is interior wimble structure, the reflecting surface of its W shape is made up of the inner cone reflecting surface 7 of the outer cone reflecting surface 6 and outer region that are positioned at middle section, outer cone reflecting surface 6 is provided with the junction of inner cone reflecting surface 7 transitional region 10 that a width is D, transitional region 10 can be planar annular, also can be and outer cone reflecting surface 6 and the tangent annular cambered surface of inner cone reflecting surface 7, the width in this region can require according to processing technology and suitably adjust, so that make.Male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 are the plane had for high reflectance, male cone (strobilus masculinus) 4 and inner conical surface 5 are installed together in mode positioned opposite with inner cone reflecting surface 7 respectively, male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 form the multiple reflections unitized construction of inner hollow, four centered by optical axis 8 Rotational Symmetry.For ensureing that incident light can along outside injection parallel with incident light, the cone angle of male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 is 90 °, and namely the angle of incident ray and male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 is 45 °.
V-arrangement axicon lens 1 and W shape axicon lens 2 are the metal bronze mirror with high reflectance, and the reflectivity of male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 pairs of S polarized lights wants a little higher than P-polarization light reflectance.Can at male cone (strobilus masculinus) 4, inner conical surface 5, outer cone reflecting surface 6 and inner cone reflecting surface 7 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 height of male cone (strobilus masculinus) 4 and inner conical surface 5, and B is the height of inner cone reflecting surface 7, and C is the height of outer cone reflecting surface 6, and D is the width of planar annular 10.As shown in Figure 1, after laser beam 9 enters this combined lens from the entrance aperture of the V-arrangement axicon lens 1 of ring-type, will successively in the internal reflection conical surface (6,7,4,5,7,6) upper generation 6 secondary reflection, then outside injection parallel with incident light.As shown in Figure 6, another kind of structural representation for a change after the structural parameters of combined lens, after laser beam 9 enters this combined lens from the entrance aperture of the V-arrangement axicon lens 1 of ring-type, first will there are 5 secondary reflections in optical axis 8 side, other 5 secondary reflections are completed at the opposite side entering symmetry, namely successively at upper generation 10 secondary reflection of the internal reflection conical surface (6,7,4,5,7,7,5,4,7,6), then outside injection parallel with incident light, is conducive to the rotational symmetry homogeneity improving endovenous laser bundle like this.
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 °, 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 (6)
1. one kind for selecting V-arrangement and the W shape combined lens structure of angle polarization, it is characterized in that: comprise the ring-type V-arrangement axicon lens (1) and W shape axicon lens (2) that Rotational Symmetry is arranged centered by optical axis that be fixed together, described V-arrangement axicon lens (1) center has entrance aperture (3), the reflecting surface of V-arrangement axicon lens (1) is made up of male cone (strobilus masculinus) (4) and inner conical surface (5), the reflecting surface of described W shape axicon lens (2) is made up of the inner cone reflecting surface (7) of the outer cone reflecting surface (6) and outer region that are positioned at middle section, described male cone (strobilus masculinus) (4) and inner conical surface (5) are positioned opposite with inner cone reflecting surface (7) respectively, described male cone (strobilus masculinus) (4), inner conical surface (5), outer cone reflecting surface (6) and inner cone reflecting surface (7) form the multiple reflections unitized construction of inner hollow, described male cone (strobilus masculinus) (4), inner conical surface (5), the cone angle of outer cone reflecting surface (6) and inner cone reflecting surface (7) is 90 °.
2. according to claim 1 a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization, it is characterized in that: described male cone (strobilus masculinus) (4), inner conical surface (5), outer cone reflecting surface (6) and inner cone reflecting surface (7) are coated with golden film respectively.
3. according to claim 1 a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization, it is characterized in that: the outer cone reflecting surface (6) of described W shape axicon lens (2) and the junction of inner cone reflecting surface (7) are provided with transitional region (10).
4. according to claim 3 a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization, it is characterized in that: described transitional region (10) is the planar annular perpendicular to optical axis.
5. according to claim 3 a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization, it is characterized in that: described transitional region (10) is annular cambered surface tangent with outer cone reflecting surface (6), inner cone reflecting surface (7) respectively.
6. arbitrary described a kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization according to claim 1-5, it is characterized in that: described V-arrangement axicon lens (1) and W shape axicon lens (2) are the metal bronze mirror with high reflectance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420548675.5U CN204360025U (en) | 2014-09-23 | 2014-09-23 | A kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization |
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| CN201420548675.5U CN204360025U (en) | 2014-09-23 | 2014-09-23 | A kind of for selecting V-arrangement and the W shape combined lens structure of angle polarization |
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| CN204360025U true CN204360025U (en) | 2015-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597612A (en) * | 2014-09-23 | 2015-05-06 | 武汉光谷科威晶激光技术有限公司 | V-shaped and W-shaped combined mirror structure for selecting angular polarization |
-
2014
- 2014-09-23 CN CN201420548675.5U patent/CN204360025U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597612A (en) * | 2014-09-23 | 2015-05-06 | 武汉光谷科威晶激光技术有限公司 | V-shaped and W-shaped combined mirror structure for selecting angular polarization |
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