CN101382654B - Light beam rotary apparatus and method capable of compensating intensity variation caused by polarization - Google Patents
Light beam rotary apparatus and method capable of compensating intensity variation caused by polarization Download PDFInfo
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- CN101382654B CN101382654B CN2008102227387A CN200810222738A CN101382654B CN 101382654 B CN101382654 B CN 101382654B CN 2008102227387 A CN2008102227387 A CN 2008102227387A CN 200810222738 A CN200810222738 A CN 200810222738A CN 101382654 B CN101382654 B CN 101382654B
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Abstract
The invention relates a beam rotating device with intensity changed by compensable polarization and a method, belonging to the field of optical technology. The device consists of a polarizing splitting prism, a 1/4 wave plate, a double refracted wave wafer and a porro prism. The invention adopts the revolving porro prism to realize the rotation of beams and adopts the double refracted wave wafer to compensate the porro prism, so as to eliminate the fluctuation of beam intensity caused by resolving the porro prism and further realize beam rotation without changing beam intensity. The invention has an application value in the field of optical information processing.
Description
Technical field
But the present invention relates to the beam rotator and the method for the Strength Changes that a kind of compensating polarizing causes.The invention belongs to optical technical field.
Background technology
The device of realizing the light beam rotation can make the light beam with certain optical field distribution rotate around turning axle, obtains its rotating mirror-image.Light beam is by behind this whirligig, and the light beam that overturns through odd number can rotate along with the rotation of upset axis of symmetry.The device that can realize the light beam rotation mainly comprises Dove prism (Dove Prism), benhain prism (Pechan Prism) and K type prism etc., and wherein the use of Dove prism is the most extensive.These prisms can be realized the rotation of light beam under the situation of the transmission direction that does not change light beam, wherein Dove prism produces 1 upset to light beam, and benhain prism produces 5 upsets to light beam, and K type prism produces 3 upsets to light beam.But device the having relatively high expectations of above realization light beam rotation to processing, guarantee the precision of two Angular Dimensions and a length dimension as the processing request of Dove prism, the machining precision that can realize can have a strong impact on the quality of light beam, and then reduces the precision of light beam rotation.In addition, these prisms can change the intensity of light beam simultaneously in rotation, and are not easy intensity fluctuation is recompensed.
The present invention intends utilizing Porro prism (Porro Prism) to realize the rotation of light beam.Incident beam can obtain and the upset light beam of incident beam with respect to Porro prism right angle rib symmetry after the Porro prism reflection, and light beam also can rotate in the time of the rotation Porro prism.This method is simpler to the requirement of the machining precision of Porro prism, only needs two right angle faces of Porro prism vertically to get final product.With respect to foregoing several prisms, the advantage that Porro prism has is simple in structure, be easy to process.Because Porro prism is similar to the birefringece crystal sheet to the character that light beam polarization changes, therefore can adopt the birefringece crystal sheet that the polarization change of folded light beam is compensated in addition, guarantee that light beam intensity in rotation does not change.
Summary of the invention
But the objective of the invention is to propose the beam rotator and the method for the Strength Changes that a kind of compensating polarizing causes.
The objective of the invention is to realize by following technical proposals:
The inventive system comprises polarization splitting prism, quarter wave plate, birefringent waveplates wafer and Porro prism.The transmitted light transmission direction of described polarization splitting prism is positioned on the reference planes, and the polarization direction of transmitted light is parallel to reference planes; The normal direction of described quarter wave plate quick shaft direction and reference planes is the angle of π/4; Described birefringent waveplates wafer and Porro prism is coaxial is solidified togather, the crystallographic axis of birefringent waveplates wafer is parallel to the right angle rib of Porro prism, makes parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism right angle rib; Described Porro prism can pivot, and the right angle rib is vertical with incident beam all the time in the time of rotation.
But the beam rotator of the Strength Changes that compensating polarizing provided by the invention causes is made of two functional blocks, and concrete steps are:
1. realize the rotation of light beam, concrete step is:
Incident beam is after the Porro prism reflection, and folded light beam will be with respect to the right angle rib symmetry of incident beam about Porro prism, and in the time of the rotation Porro prism, folded light beam will be rotated thereupon;
2. realize the compensation of light beam polarization, make the intensity of light beam not change, concrete steps are:
Incident beam transmitted light behind polarization splitting prism is the linearly polarized light that the polarization direction is parallel to reference planes, this light beam becomes circularly polarized light behind quarter wave plate, through behind birefringent waveplates wafer and the Porro prism in the light field upset, parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism right angle rib, and rotate along with the rotation of Porro prism, the polarization direction of passing through light beam behind the quarter wave plate once more is perpendicular to reference planes, next all be polarized Amici prism and reflect away, beam intensity does not change along with the rotation of Porro prism to have realized light beam thus.
Beneficial effect
Employing the present invention is simple in structure, be easy to processing, only need to guarantee two reflectings surface vertical of Porro prism, and the thickness of assurance birefringent waveplates wafer and installation are so that parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism right angle rib so that folded light beam is parallel with incident beam.Light path is easy to regulate, because two reflectings surface of Porro prism are vertical, the transmission direction of folded light beam only depends on the verticality of right angle rib and incident beam, the easier control of this beam rotator with respect to other in the time of the rotation Porro prism.
Description of drawings
Fig. 1 is a schematic diagram of the present invention, among the figure, and 1-polarization splitting prism, 2-1/4 wave plate, 3-birefringent waveplates wafer, 4-Porro prism.
Fig. 2 be among the present invention Porro prism to the rotation of light beam and the synoptic diagram of polarization variations.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
As shown in Figure 1, the inventive system comprises polarization splitting prism (1), quarter wave plate (2), birefringent waveplates wafer (3) and Porro prism (4).The transmitted light transmission direction of polarization splitting prism (1) is positioned on the reference planes, and the polarization direction of transmitted light is parallel to reference planes; The normal direction of quarter wave plate (2) quick shaft direction and reference planes is the angle of π/4; Birefringent waveplates wafer (3) and coaxial being solidified togather of Porro prism (4), the crystallographic axis of birefringent waveplates wafer (3) is parallel to the right angle rib of Porro prism, makes parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism (4) right angle rib; Porro prism (4) can pivot, and the right angle rib is vertical with incident beam all the time in the time of rotation.Concrete implementation step is: incident beam transmitted light behind polarization splitting prism (1) is the linearly polarized light that the polarization direction is parallel to reference planes, this light beam becomes circularly polarized light behind quarter wave plate, light field upset through birefringent waveplates wafer (3) and Porro prism (4) back light beam, and rotate along with the rotation of Porro prism (4), the polarization direction of passing through light beam behind the quarter wave plate once more is perpendicular to reference planes, next all be polarized Amici prism (1) and reflect away, beam intensity does not change along with the Porro prism rotation to have realized light beam.Porro prism to the rotation of light beam and polarization variations as shown in Figure 2.
Claims (2)
1. beam rotator that does not change light intensity, comprise polarization splitting prism (1), quarter wave plate (2), birefringent waveplates wafer (3), Porro prism (Porro Prism) (4), it is characterized in that: the transmitted light transmission direction of described polarization splitting prism (1) is positioned on the reference planes, and the polarization direction of transmitted light is parallel to reference planes; The normal direction of described quarter wave plate (2) quick shaft direction and reference planes is the angle of π/4; Described birefringent waveplates wafer (3) and coaxial being solidified togather of Porro prism (4), the crystallographic axis of birefringent waveplates wafer (3) is parallel to the right angle rib of Porro prism (4), makes parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism (4) right angle rib; Described Porro prism (4) can pivot, and the right angle rib is vertical with incident beam all the time in the time of rotation; Incident beam transmitted light behind polarization splitting prism (1) is the linearly polarized light that the polarization direction is parallel to reference planes, this light beam becomes circularly polarized light behind quarter wave plate, process birefringent waveplates wafer (3) and Porro prism (4) back are in the light field upset of light beam, parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism (4) right angle rib, and rotate along with the rotation of Porro prism (4), next the polarization direction of passing through light beam behind the quarter wave plate once more all is polarized Amici prism (1) and reflects away perpendicular to reference planes.
2. realize light beam rotation and do not change the method for beam intensity for one kind, it is characterized in that:
1. realize the rotation of light beam, incident beam is after Porro prism (4) reflection, and folded light beam will be with respect to the right angle rib symmetry of incident beam about Porro prism (4), and in the time of rotation Porro prism (4), folded light beam will be rotated thereupon;
2. realize the compensation of light beam polarization, incident beam transmitted light behind polarization splitting prism (1) is the linearly polarized light that the polarization direction is parallel to reference planes, this light beam becomes circularly polarized light behind quarter wave plate, process birefringent waveplates wafer (3) and Porro prism (4) back are in the light field upset of light beam, parallel beam and be π perpendicular to the phase differential of polarized component on the both direction of Porro prism (4) right angle rib, and rotate along with the rotation of Porro prism (4), the polarization direction of passing through light beam behind the quarter wave plate once more is perpendicular to reference planes, next all be polarized Amici prism (1) and reflect away, beam intensity does not change along with the rotation of Porro prism (4) to have realized light beam thus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102227387A CN101382654B (en) | 2008-09-23 | 2008-09-23 | Light beam rotary apparatus and method capable of compensating intensity variation caused by polarization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102227387A CN101382654B (en) | 2008-09-23 | 2008-09-23 | Light beam rotary apparatus and method capable of compensating intensity variation caused by polarization |
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| Publication Number | Publication Date |
|---|---|
| CN101382654A CN101382654A (en) | 2009-03-11 |
| CN101382654B true CN101382654B (en) | 2010-06-09 |
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| CN2008102227387A Expired - Fee Related CN101382654B (en) | 2008-09-23 | 2008-09-23 | Light beam rotary apparatus and method capable of compensating intensity variation caused by polarization |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995351B (en) * | 2014-03-15 | 2016-02-24 | 吉林大学 | A kind of photoscanning display and interactive device |
| CN107272307B (en) * | 2016-04-08 | 2020-11-17 | 信泰光学(深圳)有限公司 | Projection device |
| CN111098026B (en) * | 2019-12-19 | 2020-11-17 | 中国科学院西安光学精密机械研究所 | Light beam deflection self-compensation system and method of laser double-pendulum-axis machining head |
| CN112698513A (en) * | 2021-01-14 | 2021-04-23 | 苏州大学 | Light beam optical axis self-stabilization device and method based on transmission type mechanical modulation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199042A (en) * | 1992-01-10 | 1993-03-30 | Litton Systems, Inc. | Unstable laser apparatus |
| EP0548625A1 (en) * | 1991-12-09 | 1993-06-30 | Hughes Aircraft Company | Direct view and infrared imaging apparatus for a portable missile launcher |
| US5847871A (en) * | 1994-04-05 | 1998-12-08 | Raytheon Company | Monolithic multifunctional optical elements |
| CN1724968A (en) * | 2004-07-23 | 2006-01-25 | 安捷伦科技有限公司 | Heterodyne laser interferometer with porro prisms for measuring stage displacement |
-
2008
- 2008-09-23 CN CN2008102227387A patent/CN101382654B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0548625A1 (en) * | 1991-12-09 | 1993-06-30 | Hughes Aircraft Company | Direct view and infrared imaging apparatus for a portable missile launcher |
| US5199042A (en) * | 1992-01-10 | 1993-03-30 | Litton Systems, Inc. | Unstable laser apparatus |
| US5847871A (en) * | 1994-04-05 | 1998-12-08 | Raytheon Company | Monolithic multifunctional optical elements |
| CN1724968A (en) * | 2004-07-23 | 2006-01-25 | 安捷伦科技有限公司 | Heterodyne laser interferometer with porro prisms for measuring stage displacement |
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| CN101382654A (en) | 2009-03-11 |
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