CN101320135A - Polarization beam splitter prism - Google Patents
Polarization beam splitter prism Download PDFInfo
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- CN101320135A CN101320135A CNA200810071393XA CN200810071393A CN101320135A CN 101320135 A CN101320135 A CN 101320135A CN A200810071393X A CNA200810071393X A CN A200810071393XA CN 200810071393 A CN200810071393 A CN 200810071393A CN 101320135 A CN101320135 A CN 101320135A
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Abstract
The invention discloses a polarization beam splitter prism which is characterized in that the polarization beam splitter prism comprises a triangular crystal prism; wherein, the reflecting planes of the triangular crystal prism are parallel to each other, the directions of the optical axes of the triangular crystal prism are same; along with the direction which is parallel to the principal section and corresponds to the two reflection planes of the triangular crystal prism, an irregular polarized light is incident upon the crystal and then is divided into two light beams which are polarized and perpendicular to each other and parallel to each other in the transmission directions by utilizing the light polarizing and splitting property of the triangular crystal prism and the reflection principle of the reflection plane. The structure of the invention has small volume and low cost, and is easy to realize.
Description
Technical field
The present invention relates to optical field, relate in particular to that a kind of to make a light beam be divided into polarization vertical mutually, and two light beams that the direction of propagation is parallel to each other constitute the polarization beam splitter prism that two bunch polarized light space distributions are parallel to each other.
Background technology
Polarization beam splitter prism produces single polarized light as the traditional optical element, has been widely used in fields such as optics, laser.Conventional polarization beam splitter prism only produces single polarization direction light, or two linearly polarized light beams have the light beam of certain angle.And producing the orthogonal light beam of two polarizations, the crystal prism that the while direction of propagation is parallel to each other normally adopts the Walk-off crystal.The birefringece crystal of the present largest refractive index difference that exists, as vanadic acid yttrium and rutile, about 6 ° of walk-off angle, when crystal was 10mm length, O light separated only 1mm with e light.Like this, to large spot, be the hot spot of 10mm as diameter, then need the 100mm long crystal to separate, manufacturing cost significantly increases like this, and light energy losses also strengthens simultaneously, and this obviously is unrealistic method.
Summary of the invention
The object of the invention provides a kind of simple in structure, low cost of manufacture to make a light beam be divided into polarization vertical mutually, and the polarization beam splitter prism of two light beams that the direction of propagation is parallel to each other.
The present invention is by the following technical solutions: polarization beam splitter prism comprises a diabolo crystal prism, the reflecting surface of triangle crystal prism is parallel to each other, the optical axis direction of triangle crystal prism is identical, along parallel principal section, relative two triangle crystal prism reflecting surface trend.
Each surface of an above-mentioned diabolo crystal prism is parallel to each other.
Distance between the above-mentioned diabolo crystal prism can be regulated.
An above-mentioned diabolo crystal prism is the birefringece crystal prism.
Be provided with the catoptron of parallel triangular prism of a pair of reflecting surface or pair of parallel at above-mentioned triangle crystal prism output terminal.
The present invention adopts above technical scheme, utilizes the triangle crystal prism to the polarisation of light beam splitting, and the principle of reflection of reflecting surface, and behind a branch of random polarized light incident crystal, it is vertical mutually to be broken down into polarization, and two light beams that the direction of propagation is parallel to each other; By regulating the distance between the diabolo crystal prism, can adjust the distance between two parallel light beams.This structural volume is little, cost is low, realizes easily.Can use and the major diameter isolator, separate mutually vertical frequency doubled light of polarization and fundamental wave etc. in the laser instrument.
Description of drawings
Now in conjunction with the accompanying drawings the present invention is done further auspicious stating:
Fig. 1 is the principle schematic of polarization beam splitter prism of the present invention;
Fig. 2 is the structural representation of one of polarization beam splitter prism embodiment of the present invention;
Fig. 3 is two the structural representation of polarization beam splitter prism embodiment of the present invention.
Embodiment
See also shown in Figure 1, the present invention includes a diabolo crystal prism 101,102, the reflecting surface 1011,1021 of triangle crystal prism 101,102 is parallel to each other, the optical axis direction of triangle crystal prism 101,102 is identical, along parallel principal section, relative two triangle crystal prism reflecting surface 1011,1021 trends.One diabolo crystal prism the 101, the 102nd, the birefringece crystal prism, its each surface can be parallel to each other.
Export the distance between two parallel light beams as required, the distance between the diabolo crystal prism 101,102 can be regulated.Suppose that the polarized light incident direction is a directions X, the vertical directions X in principal section be the Z direction, vertical principal section direction is the Y direction.A branch of random polarized light is after first triangle crystal prism 101 of X-direction incident, be decomposed into perpendicular to the principal section along the O light of Y direction vibration be parallel to the e light of principal section along the vibration of Z direction, according to birefringence, the direction of propagation unanimity of two-beam, suppose the refractive index n o＞ne of two-beam, reflecting slant and optical axis Z angle at 45, two bunch polarized lights will total reflection on 45 ° of reflectings surface 1011, o light is obeyed the reflection law of uniform dielectric, its reflection angle equals incident angle, promptly equal 45 °, so propagate along the optical axis direction of triangle crystal prism 101 o light reflection back, but direction of vibration is that Z is axial before the reflection of e light, after the reflection still along Z to propagation, though the still parallel principal section of its direction of vibration, but by Z become X to, its refractive index becomes ne ' ≈ no, therefore be equivalent in the medium of different refractivity, propagate before and after the reflection of e light, can obtain e reflection of light angle θ 1 according to the reflection formula of anisotropic medium, noSin45 °=neSin θ 1 ', e light after 101 outgoing of triangle crystal prism with θ 1 " outgoing, its θ 1 "=Arcsin[no*Sin (45 °-θ 1 ')], promptly e light will " depart from the o light direction road with θ 1 in air.O light and e light freely arrive before the triangle crystal prism 102 in air, O light separates L*tan (distance that θ 1 "); L is a diabolo crystal prism 101; distance of Z direction between 102; because a pair of triangle crystal prism 101; 102 reflecting surface 1011; 1021 are parallel to each other with e light in air, by the light path symmetry principle, after o light and e light enter triangle crystal prism 102, after reflection on 45 ° of reflectings surface 1021, transfer the two-beam that is parallel to each other again to, it is orthogonal in output end face to obtain the polarization direction, still remains the two bundle polarized lights that are parallel to each other.Can freely control distance of separation between o light and the e light by distance between the control two prisms, the reflecting surface 1011,1021 of regulating a pair of triangle crystal prism 101,102 simultaneously is parallel to each other, and can keep o, and e light is parallel to each other.
When incident light is not during along directions X incident triangle crystal prism 101, as long as incident angle is in the scope of two reflectings surface 1011,1021, all can obtain be parallel to each other o light and e light, so can obtain two bunch polarization beam splitting light in polarizers of big angle scope and wide wavelength coverage.
See also shown in Fig. 2 or 3, the present invention can also be provided with the catoptron 105,106 of a pair of reflecting surface parallel common triangular prism 103,104 or pair of parallel at triangle crystal prism 102 output terminals, and emergent light is got back on the direction of propagation of former incident light again.
Claims (5)
1, a kind of polarization beam splitter prism, it is characterized in that: it comprises a diabolo crystal prism, the reflecting surface of triangle crystal prism is parallel to each other, and the optical axis direction of triangle crystal prism is identical, along parallel principal section, relative two triangle crystal prism reflecting surface trend.
2, a kind of polarization beam splitter prism according to claim 1 is characterized in that: each surface of one diabolo crystal prism is parallel to each other.
3, a kind of polarization beam splitter prism according to claim 1 and 2 is characterized in that: the distance between the one diabolo crystal prism can be regulated.
4, a kind of polarization beam splitter prism according to claim 1 and 2 is characterized in that: one diabolo crystal prism is the birefringece crystal prism.
5, a kind of polarization beam splitter prism according to claim 1 is characterized in that: the catoptron that is provided with parallel triangular prism of a pair of reflecting surface or pair of parallel at triangle crystal prism output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810071393XA CN101320135A (en) | 2008-07-14 | 2008-07-14 | Polarization beam splitter prism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810071393XA CN101320135A (en) | 2008-07-14 | 2008-07-14 | Polarization beam splitter prism |
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| Publication Number | Publication Date |
|---|---|
| CN101320135A true CN101320135A (en) | 2008-12-10 |
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| CNA200810071393XA Pending CN101320135A (en) | 2008-07-14 | 2008-07-14 | Polarization beam splitter prism |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424878A (en) * | 2012-12-02 | 2013-12-04 | 上海理工大学 | Polarization light-splitting device |
| CN103424880A (en) * | 2013-06-21 | 2013-12-04 | 上海理工大学 | Device for generating cylindrical vector polarized light beam based on polarizing prisms |
| CN103869505A (en) * | 2012-12-17 | 2014-06-18 | 福州高意通讯有限公司 | Large-aperture polarization independent high-power isolator |
| CN107037539A (en) * | 2017-05-12 | 2017-08-11 | 北京航空航天大学 | Single polarization transmission formula photonic crystal fiber resonator |
| CN113013715A (en) * | 2021-02-25 | 2021-06-22 | 中国科学院理化技术研究所 | Discrete polarization laser beam splitting device and system thereof |
| CN113093412A (en) * | 2021-04-12 | 2021-07-09 | 武汉天马微电子有限公司 | Display panel, control method and display device |
-
2008
- 2008-07-14 CN CNA200810071393XA patent/CN101320135A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424878A (en) * | 2012-12-02 | 2013-12-04 | 上海理工大学 | Polarization light-splitting device |
| CN103424878B (en) * | 2012-12-02 | 2015-11-25 | 上海理工大学 | Light splitting device |
| CN103869505A (en) * | 2012-12-17 | 2014-06-18 | 福州高意通讯有限公司 | Large-aperture polarization independent high-power isolator |
| CN103424880A (en) * | 2013-06-21 | 2013-12-04 | 上海理工大学 | Device for generating cylindrical vector polarized light beam based on polarizing prisms |
| CN103424880B (en) * | 2013-06-21 | 2015-09-16 | 上海理工大学 | Polarizing prism produces the device of post vector light beam |
| CN107037539A (en) * | 2017-05-12 | 2017-08-11 | 北京航空航天大学 | Single polarization transmission formula photonic crystal fiber resonator |
| CN107037539B (en) * | 2017-05-12 | 2020-06-02 | 北京航空航天大学 | Single polarization transmission type photonic crystal fiber resonant cavity |
| CN113013715A (en) * | 2021-02-25 | 2021-06-22 | 中国科学院理化技术研究所 | Discrete polarization laser beam splitting device and system thereof |
| CN113093412A (en) * | 2021-04-12 | 2021-07-09 | 武汉天马微电子有限公司 | Display panel, control method and display device |
| CN113093412B (en) * | 2021-04-12 | 2023-11-03 | 武汉天马微电子有限公司 | Display panel, control method and display device |
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Open date: 20081210 |