CN107092100A - A kind of three output bireflectance symmetric splitting ahrens prisms of Iceland spar and glass combination - Google Patents
A kind of three output bireflectance symmetric splitting ahrens prisms of Iceland spar and glass combination Download PDFInfo
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- CN107092100A CN107092100A CN201710367751.0A CN201710367751A CN107092100A CN 107092100 A CN107092100 A CN 107092100A CN 201710367751 A CN201710367751 A CN 201710367751A CN 107092100 A CN107092100 A CN 107092100A
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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
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Abstract
The invention belongs to the structure design of optical element and material selection field, Iceland spar and three output bireflectance symmetric splitting ahrens prisms of glass combination are related specifically to.This method uses Iceland spar and glass combination, it have devised one kind three and export symmetric splitting ahrens prism, the combination polariscope is the combined prism of three outputs, can symmetric splitting be polarized, light beam can be made to turn to 90 ° again, a steering prism can be saved in system design, the light beam polarization characteristic kept, combined prism also has the output window of a reference light simultaneously, the characteristics of reference light has relative to incident light without face deformation, incident light can be monitored by the analysis to reference optical signal or accordingly modulated, finally, the combination ahrens prism can also save calcite crystal material, reduce prism cost of manufacture.
Description
Technical field
The invention belongs to the structure design of optical element and material selection field, Iceland spar and glass combination are related specifically to
Three output bireflectance symmetric splitting ahrens prisms.
Background technology
With developing rapidly for the development of polarization optics, especially Polarization Detection technology, devating prism is always people pass
The object of note, it be light path be polarized, the core devices of analyzing.It is general at present that prism is made using calcite crystal, but naturally
Optical grade calcite crystal resource it is increasingly exhausted, find that to replace crystal or Curve guide impeller to reduce Iceland spar in single prism brilliant
The consumption of body material, and the function of single prism of raising are integrated, just turn into study hotspot.
The content of the invention
Based on problem above, it is an object of the invention to be selected by new prism structure design and material, using ice continent
Three output bireflectance symmetric splitting ahrens prisms of the method for stone crystal and glass combination, design Iceland spar and glass combination, make
Prism is provided simultaneously with 90 ° of steerings of light beam and symmetric splitting function, and provides to go out available for the three beams of light source state monitoring
Reference light is penetrated, the multifunctional unit of single combined prism is realized, while reducing the consumption of calcite crystal material.
H-BaK8 glass is optical glass, is a kind of optical window material, as a kind of optical glass, possess size it is big,
Low-cost feature, its optics is 290nm ~ 2400nm through scope, covers the transmission scope of calcite crystal prism, the present invention
From H-BaK8 glass key technology be H-BaK8 glass dispersion of refractive index curve almost Perfect be located at the master of Iceland spar two
The centre of dispersion of refractive index curve, as shown in Figure 1；When with calcite crystal prism arrangement, by structure design, it can make non-
Deviation, the angle approximately equal of two deflections of light occur when ordinary light and ordinary light are by prism.
The technical solution adopted by the present invention is that two prisms are glued together by resin glue, optical cement or air-gap, is formed
Irregular rib body structure, as shown in Figure 2；The material of described two prisms is respectively H-BaK8 glass and calcite crystal；It is described
H-BaK8 glass be optical glass, H-BaK8 be optical field to the generally acknowledged numbering of the glass, wherein BaK represents barium crown glass
Glass, H represents environment-friendly type lead-free, arsenic, cadmium and other radioactive elements；Described calcite crystal is natural light classes and grades in school Iceland spar
Crystal；As shown in figure 3, the light pass surface that described section is irregular quadrilateral prism is that left side incident end face and lower section outgoing are oblique
Face and right side reference light outgoing inclined-plane, top total reflection inclined-plane is also burnishing surface；The light pass surface of the right-angle prism is always
Edged surface and inclined-plane；The optical axis direction of described Iceland spar right-angle prism is parallel to thang-kng inclined-plane and two right-angle surfaces；Described is digonous
The structure angle of mirror light pass surface is respectively S2、S3And S4, the relation between structure angle is：
（1）
（2）
Another structure angle S of described combined prism1Perseverance is 45 °, the purpose is to be totally reflected light beam, realizes 90 ° of steerings.
Two light beams after the polarization beam splitting shown in Fig. 3 and vertical direction angle can be obtained according to the law of refractionθ 1、θ 2,
And the splitting angle Δ and symmetric splitting deviation δ of combined prism：
（3）
（4）
（5）
（6）.
A kind of conventional Iceland spar Double-element bireflectant polarization beamsplitting prism structure and index path are as shown in figure 4, by two blocks of Iceland spar
Crystal prism is constituted；The Iceland spar and three output bireflectance symmetric splitting ahrens prism ratios of glass combination that the present invention is designed are with rule
The Iceland spar Double-element bireflectant polarization beamsplitting prism of lattice reduces by about 70% calcite crystal materials'use amount, and this is outstanding in calcite crystal
It is that bulky crystal is increasingly rare present, is had great importance, while H-BaK8 glass prices are low more than calcite crystal
It is honest and clean, the manufacturing cost of single prism can be reduced；The used H-BaK8 glass transmissions scope covering Iceland spar of present invention design
The transparency range of crystal prism, therefore the combined prism that the present invention is designed covers conventional Iceland spar Double-element bireflectant polarization beamsplitting prism
Applicable wavelengths scope；Fig. 5 be according to the law of refraction calculate structure angle is identical and S2In the case of for 45 °, shown in Fig. 4
Conventional Iceland spar Double-element bireflectant polarization beamsplitting prism and Iceland spar of the present invention and H-BaK8 glass combination prism beam splitting pair
Claim the comparison of implementations, it can be seen that the combined prism symmetric splitting performance that the present invention is designed will greatly be better than structure angle phase
Same Iceland spar Double-element bireflectant polarization beamsplitting prism, in 300 ~ 2000nm broadband, the combined prism that the present invention is designed is symmetrical
Beam splitting deviation is averagely only 1/5th of Iceland spar Double-element bireflectant polarization beamsplitting prism symmetric splitting deviation.
Light beam turns from combined prism left end face vertical incidence after the top reflecting surface total reflection of H-BaK8 glass prisms
To 90 °, then occurring refraction below H-BaK8 glass prisms on interface and reflecting, because of light pass surface on the right side of H-BaK8 glass prisms
With lower section light pass surface angle S4It is set as and Iceland spar right-angle prism structure angle S2Equal, from reflection law, the reflected beams are hung down
Straight H-BaK8 glass prism its right end face outgoing, the reflected beams can be as reference beam, and the state to light source is carried out in real time
Monitoring, or feedback control is carried out to light source according to Monitoring Data is further；Because the reference beam passes through for light beam of light source
Formed after perpendicular end surface incidence, two secondary reflections, a perpendicular end surface outgoing, middle situation about being reflected without oblique angle, so should
Reference beam has face type consistent with light source, distortionless advantage.
The beneficial effects of the invention are as follows：Calcite crystal resource is saved, prism cost of manufacture, the symmetrical performance of beam splitting is reduced
It is good, the steering of light beam, symmetric splitting and offer are rolled into one without face type distortion three functions of reference light, the light beam kept is inclined
Shake quality, save optical path space, reduce light intensity loss, improve the easy degree of optical path adjusting.
Brief description of the drawings：
The dispersion of refractive index curve for the H-BaK8 glass that Fig. 1 uses for the present invention and the non-ordinary light of Iceland spar, ordinary light principal refractive index
Dispersion curve figure, wherein ngFor the refractive index of H-BaK8 glass, noFor the principal refractive index of Iceland spar ordinary light, neIt is non-for Iceland spar
The principal refractive index of ordinary light；
Fig. 2 is the structure chart of Iceland spar of the present invention and three output bireflectance symmetric splitting ahrens prisms of glass combination, wherein double
The direction of calcite crystal optical axis is represented to arrow；
Fig. 3 is the structure and index path of Iceland spar of the present invention and three output bireflectance symmetric splitting ahrens prisms of glass combination,
Its orbicular spot represents direction perpendicular to paper；
Fig. 4 is the structure and index path of conventional Iceland spar Double-element bireflectant polarization beamsplitting prism, and wherein four-headed arrow represents that Iceland spar is brilliant
Body optical axis is oriented parallel to paper, and round dot represents direction perpendicular to paper；
Fig. 5 is that Iceland spar of the present invention exports bireflectance symmetric splitting ahrens prism and identical S with the three of glass combination1、S2、S3Knot
The contrast curve of the conventional Iceland spar Double-element bireflectant polarization beamsplitting prism symmetric splitting deviation at structure angle, wherein structure angle S2=45 °, δ
Represent the symmetric splitting deviation of combined prism of the present invention, δbRepresent that conventional Iceland spar Double-element bireflectant polarization beamsplitting prism symmetric splitting is inclined
Difference.
Embodiment：
Embodiment one：As shown in figure 3, it is irregular quadrilateral prism and right-angle prism, material that the structure of two prisms, which is respectively section,
Matter is respectively H-BaK8 glass and calcite crystal, and the optical axis direction of Iceland spar right-angle prism is parallel to thang-kng inclined-plane and two right angles
Glued by air-gap form between face, two prisms, structure angle is respectively in combined prism：S1=45.00 °, S2=36.00 °, S3=
126.00 °, S4=36.00°；It is 632.8nm to take lambda1-wavelength, now, and the refractive index of H-BaK8 glass is 1.57041, ice continent
The non-ordinary light principal refractive index of stone crystal is 1.48515, and ordinary light principal refractive index is 1.65567, and light is from H-BaK8 glass prisms
Left end face vertical incidence, 90 ° redirect to vertically downward direction after being totally reflected on upper reflecting surface, in H-BaK8 glass and air
Refraction occurs on gap interface and reflects, wherein reflected light is formed from light pass surface vertical surface outgoing on the right side of H-BaK8 glass prisms
Reference light, refraction light reaches air-gap and Iceland spar interface through air-gap, occurs birefringence beam splitting, and two light beams are straight in Iceland spar
Air is refracted into the lower section thang-kng right-angle surface of angle prism, splitting angle further expands；According to the law of refraction, according to formula（3）~
（6）, the splitting angles that can calculate three output bireflectance symmetric splitting ahrens prisms of Iceland spar and glass combination are
7.11 °, symmetric splitting deviation is 0.11 °, and the numerical value is identical S1、S2、S3Structure angle（That is S1=45.00 °, S2=36.00 °, S3=
126.00°）Conventional Iceland spar Double-element bireflectant polarization beamsplitting prism symmetric splitting deviation 1/4.
Embodiment two：As shown in figure 3, the structure of combined prism is respectively a section for irregular quadrilateral prism and always
Angle prism, material is respectively H-BaK8 glass and calcite crystal, and the optical axis direction of Iceland spar right-angle prism is oblique parallel to thang-kng
Glued by optical cement form between face and two right-angle surfaces, two prisms, structure angle is respectively in combined prism：S1=45.00 °, S2=
46.63 °, S3=136.63 °, S4=46.63 °, it is 365.0nm to take lambda1-wavelength, and now, the refractive index of H-BaK8 glass is
1.59725, the non-ordinary light principal refractive index of calcite crystal is 1.50190, and ordinary light principal refractive index is 1.69100, and light is from H-
BaK8 glass prism left end face vertical incidence, 90 ° redirect to vertically downward direction after being totally reflected on upper reflecting surface, in H-
BaK8 glass hangs down with reflection and birefringence, wherein reflected light occur on Iceland spar interface from light pass surface on the right side of H-BaK8 glass prisms
Straight surface outgoing, forms reference light, and two beams refraction light is refracted into air in the lower section thang-kng right-angle surface of Iceland spar right-angle prism,
Splitting angle further expands；According to the law of refraction, according to formula（3）~（6）, Iceland spar and glass combination can be calculated
The splitting angle of three output bireflectance symmetric splitting ahrens prisms is 11.55 °, and symmetric splitting deviation is 0.49 °, and the numerical value is about phase
Same S1、S2、S3Structure angle（That is S1=45.00 °, S2=46.63 °, S3=136.63°）Conventional Iceland spar bireflectance polarized beam splitting rib
The 1/4 of mirror symmetric splitting deviation.
Embodiment three：As shown in figure 3, the structure of combined prism is respectively a section for irregular quadrilateral prism and always
Angle prism, material is respectively H-BaK8 glass and calcite crystal, and the optical axis direction of Iceland spar right-angle prism is oblique parallel to thang-kng
Carrying out structure angle in gluing, combined prism by resin glue between face and two right-angle surfaces, two prisms is respectively：S1=45.00 °, S2=
45.00 °, S3=135.00 °, S4=45.00 °, it is 706.5nm to take lambda1-wavelength, and now, the refractive index of H-BaK8 glass is
1.56778, the non-ordinary light principal refractive index of calcite crystal is 1.48353, and ordinary light principal refractive index is 1.65207, and light is from H-
BaK8 glass prism left end face vertical incidence, 90 ° redirect to vertically downward direction after being totally reflected on upper reflecting surface, in H-
BaK8 glass is with occurring refraction and reflecting on resin glue interface, wherein reflected light is vertical from light pass surface on the right side of H-BaK8 glass prisms
Surface outgoing, forms reference light, and refraction light reaches resin glue and Iceland spar interface through resin glue, occurs birefringence beam splitting, two
Light beam is refracted into air in the lower section thang-kng right-angle surface of Iceland spar right-angle prism, and splitting angle further expands；It is fixed according to refraction
Rule, according to formula（3）~（6）, Iceland spar and three output bireflectance symmetric splitting ahrens prisms of glass combination can be calculated
Splitting angle be 9.70 °, symmetric splitting deviation be 0.26 °, the numerical value is about identical S1、S2、S3Structure angle（That is S1=45.00 °, S2
=45.00 °, S3=135.00°）Conventional Iceland spar Double-element bireflectant polarization beamsplitting prism symmetric splitting deviation 1/3.
Claims (1)
1. three output bireflectance symmetric splitting ahrens prisms of a kind of Iceland spar and glass combination, including one piece of section is irregular
The prism of quadrangle and one piece of right-angle prism, section are that the light pass surface of irregular quadrilateral prism is left incident end face, lower outgoing
Inclined-plane and right outgoing inclined-plane, the light pass surface of right-angle prism is a right-angle surface and inclined-plane, and a pair of thang-kng inclined-planes of two prisms pass through tree
Fat glue, optical cement or air-gap are glued together, it is characterised in that：Described section is that the material of irregular quadrilateral prism is H-
BaK8 glass, right-angle prism material is calcite crystal, and the optical axis of Iceland spar right-angle prism is parallel to thang-kng inclined-plane and two right angles
Face, section is equal to the light pass surface of right-angle prism two for the structure angle between the left light pass surface and lower outgoing inclined-plane of irregular quadrilateral prism
Between structure angle add 90 °, section is equal to straight for the structure angle between the right light pass surface and lower outgoing inclined-plane of irregular quadrilateral prism
Structure angle between the light pass surface of angle prism two.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710367751.0A CN107092100A (en) | 2017-05-23 | 2017-05-23 | A kind of three output bireflectance symmetric splitting ahrens prisms of Iceland spar and glass combination |
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| CN201710367751.0A CN107092100A (en) | 2017-05-23 | 2017-05-23 | A kind of three output bireflectance symmetric splitting ahrens prisms of Iceland spar and glass combination |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2289252Y (en) * | 1997-04-11 | 1998-08-26 | 严家彪 | Multipurpose polarizing prism |
| CN202102135U (en) * | 2011-07-08 | 2012-01-04 | 福州高意光学有限公司 | Deep-ultraviolet, visual and near-infrared polarizing prism |
-
2017
- 2017-05-23 CN CN201710367751.0A patent/CN107092100A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2289252Y (en) * | 1997-04-11 | 1998-08-26 | 严家彪 | Multipurpose polarizing prism |
| CN202102135U (en) * | 2011-07-08 | 2012-01-04 | 福州高意光学有限公司 | Deep-ultraviolet, visual and near-infrared polarizing prism |
Non-Patent Citations (2)
| Title |
|---|
| 任树锋: ""冰洲石晶体偏光棱镜设计概要"", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
| 李景镇: "《光学手册下卷》", 31 July 2010 * |
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