CN103441411B - Based on the laser aid that the degree of polarization of even light pipe is controlled - Google Patents
Based on the laser aid that the degree of polarization of even light pipe is controlled Download PDFInfo
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- CN103441411B CN103441411B CN201310391452.2A CN201310391452A CN103441411B CN 103441411 B CN103441411 B CN 103441411B CN 201310391452 A CN201310391452 A CN 201310391452A CN 103441411 B CN103441411 B CN 103441411B
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Abstract
The present invention relates to the device controlling laser polarization degree, be specially a kind of laser aid controlled based on the degree of polarization of even light pipe, solve the problem that device exists structure complexity, cost is high of existing adjustment laser polarization degree. a kind of laser aid controlled based on the degree of polarization of even light pipe, frame is adjusted including the LASER Light Source of linear polarization and the light source polarization direction of the described LASER Light Source rotation of adjustment, the linearly polarized laser light beam sent by LASER Light Source is successively through beam expanding lens, form incident light beam strikes inwall after plus lens shaping and be coated with the even light pipe of metallic reflective coating, the inwall of described even light pipe at least has a pair and is mutually perpendicular to face, the angle that the right-angle side that the face that is mutually perpendicular in described incident light polarization direction and even light pipe cross section is formed is formed is denoted as angle, polarization direction θ, described light source polarization direction adjusts frame adjustment LASER Light Source rotation and makes angle, polarization direction θ adjustable from 0 ° to 45 °. the present invention is reasonable in design, simple in construction, has reached degree of polarization and has controlled the beneficial effect of excellent effect.
Description
Technical field
The present invention relates to the device controlling laser polarization degree, be specially a kind of laser aid controlled based on the degree of polarization of even light pipe.
Background technology
Degree of polarization is the important physical amount of the polarization characteristic describing light. The degree of polarization of light beam is commonly defined as the ratio of the luminous power of the polarized component of light beam and the total optical power of light beam, and degree of polarization directly affects the signal to noise ratio of high-precision optical monitoring accuracy, the sensitivity of photoelectric sensor, optic communication signal. Therefore the degree of polarization controlling light beam is significant at multiple fields.
Authorization Notice No. CN1848554B proposes a kind of controllable polarization degree LASER Light Source, restraints different polarization degree light beam by two, synthesizes controllable polarization degree light beam by polarized combination instrument. Adjusted the strength ratio of two-beam by electro-optical feedback, and two-beam becomes conjunction Shu Shixian have controllable degree of polarization. The method needs the degree of polarization to two-beam and luminous power to realize accurately controlling, it is necessary to adopting a large amount of photoelectric device, structure is complicated, relatively costly.
Authorization Notice No. CN101247017A is drawn by two opposite direction laser of bidirectional optical fiber ring resonator 2X2 wide-band coupler, then closes bundle with polarization beam combiner, it is thus achieved that controllable polarization degree. The method structure is complicated, relatively costly.
Authorization Notice No. CN102980661A proposes the standard fiber light supply apparatus of a kind of variable polarization degree. This device utilizes beam splitter that same light source laser is divided into 2 bundles, utilizes Polarization Controller to control the polarization state of two-beam respectively, and closes bundle output and can provide 0～100%. Can realizing becoming degree of polarization with single light source to control, but relate to light source beam splitting, add light path debugging difficulty, and need also exist for Polarization Controller and realize degree of polarization control, structure is complicated.
Summary of the invention
The present invention is to solve the problem that device exists structure complexity, cost is high of existing adjustment laser polarization degree, it is provided that a kind of laser aid controlled based on the degree of polarization of even light pipe.
The present invention adopts the following technical scheme that realization:
A kind of laser aid controlled based on the degree of polarization of even light pipe, frame is adjusted including the LASER Light Source of linear polarization and the light source polarization direction of the described LASER Light Source rotation of adjustment, the linearly polarized laser light beam sent by LASER Light Source is successively through beam expanding lens, form incident light beam strikes inwall after plus lens shaping and be coated with the even light pipe of metallic reflective coating, the inwall of described even light pipe at least has a pair and is mutually perpendicular to face, the angle that the right-angle side that the face that is mutually perpendicular in described incident light polarization direction and even light pipe cross section is formed is formed is denoted as angle, polarization direction θ, described light source polarization direction adjusts frame adjustment LASER Light Source rotation and makes angle, polarization direction θ adjustable from 0 ° to 45 °.
As shown in following formula (1), the complex polarization parameter of reflection lightAlong with incident light polarization direction, angle of incidence between two kinds of reflecting mediumsAnd refraction angleChange and reflecting interface on the relative index of refraction n of bi-material and change. Namely along with incident light polarization direction is different, angle, the polarization direction θ of incident illumination is different, and the polarization state (polarization direction and ovality) of reflecting light can be different therewith.
(1)
Because metal material coefficient of refractionShow as plural form, therefore can be changed when linear polarization coherent light retrodeviates polarization state by the reflection of metal-plated membrane interface by Metal film reflector, if after be there is the light-pipe structure in the face of being mutually perpendicular to (if cross section is right angled triangle or rectangle) primary event, the complex polarization parameter of reflection lightDistribution along with line of incidence polarization laser angle, polarization direction θ from 0 ° to 45 ° increase and quickly form variation distribution (as shown in Figure 5). Under identical angle of incidence and incident polarization direction, the face of being mutually perpendicular to can make reflection light produce identical polarization direction, the ellipse degree of bias, and the elliptically polarized light of contrary rotation direction, thus exacerbating the variation of polarization. After multiple reflections, when angle, polarization direction θ equal to 45 ° time output light polarization state access expansion light (as shown in Figure 7), thus degree of polarization can realize from 1 to close to 0.03 control (as shown in Figure 8).
The present invention is reasonable in design, simple in construction, it is not necessary to the devices such as optic/electro converter box photoelectric measurement, has reached degree of polarization and has controlled the beneficial effect of excellent effect, and this device is easily integrated simultaneously, have simple in construction, with low cost, the advantage such as be easily integrated.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is even light pipe cross section is the schematic diagram of angle, polarization direction θ of right angled triangle.
Fig. 3 is even light pipe cross section is the schematic diagram of angle, polarization direction θ of rectangle.
Fig. 4 even smooth inside pipe wall film system schematic diagram.
Fig. 5 is the polarization direction angular dependence figure of polarization complex plane distribution and incident illumination, wherein, ● represent θ=0, × represent θ=10, represent θ=20, represent θ=30, ★ represents θ=45.
Fig. 6 is the graph of a relation of polarisation distribution and θ=0 °, angle, polarization direction of incident illumination.
Fig. 7 is the graph of a relation of polarisation distribution and θ=45 °, angle, polarization direction of incident illumination.
Fig. 8 is angle, the polarization direction θ graph of a relation of degree of polarization and incident illumination.
In figure, 101-LASER Light Source, 102-light source polarization direction adjusts frame, 103-beam expanding lens, 104-plus lens, the even light pipe of 105-, 201-incident light polarization direction, 301-metallic reflective coating, 302-substrate.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
As shown in Figure 1, a kind of laser aid controlled based on the degree of polarization of even light pipe, frame 102 is adjusted including the LASER Light Source 101 of linear polarization and the light source polarization direction of the described LASER Light Source rotation of adjustment, the linearly polarized laser light beam sent by LASER Light Source is successively through beam expanding lens 103, form incident light beam strikes inwall after plus lens 104 shaping and be coated with the even light pipe 105(of metallic reflective coating 301 as shown in Figure 4), namely it is the incident illumination with certain solid angle by optical shaping device (i.e. beam expanding lens 103 and plus lens 104) by extreme for line of incidence beam shaping, incident illumination realizes linearly polarized laser depolarization at the multiple reflections of hollow light pipe, and control to incide the polarization direction of the extreme light of line in light pipe by light source adjustment frame, cause the change of output polarization degree, thus realizing degree of polarization control. the inwall of described even light pipe 105 at least has the face that is mutually perpendicular to a pair, and (such as cross section is right angled triangle or cross section is rectangle, as shown in Figure 2,3), the angle that the right-angle side that the face that is mutually perpendicular in described incident light polarization direction 201 and even light pipe 105 cross section is formed is formed is denoted as angle, polarization direction θ, described light source polarization direction adjusts frame 102 and adjusts LASER Light Source 101 rotation and make angle, polarization direction θ adjustable from 0 ° to 45 °, it is achieved the degree of polarization control from 1 to 0.03.
When being embodied as, it is shown that it is normal optical instrument that light source polarization direction adjusts frame 102, and its degree of regulation is preferably 0.02 °.
Described LASER Light Source 101 adopts altitude line polarization laser light source.
Plating reflectance coating 301 in the glass material substrate 302 of described even light pipe 105, by Metal film reflector, makes light export from even light pipe exit end. When the cross section of described even light pipe 105 is rectangle, it is of a size of 4mm × 4mm × 60mm or its size. Described metallic reflective coating can be the metal film system that silver, aluminum etc. have absorbent properties.
Described beam expanding lens 103 adopts 20 power beam expansion lens; Described plus lens 104 adopts BK7 optical glass plus lens.
Time specifically used, as shown in Figure 1, LASER Light Source 101 is by inclined for line laser beam, 103 are expanded for diameter 20mm hot spot by beam expanding lens, converge then through plus lens 104, incide even light pipe 105 with 23 ° of angle of incidence (solid angle), adjust frame 102 by adjusting light source polarization direction, control incident light polarization direction 201 adjustable from 0 ° to 45 ° with angle, the polarization direction θ that the base (right-angle side) of even light pipe 105 is formed, it is achieved degree of polarization controls.
Because the absorbent properties of metal material, its coefficient of refractionShow as plural form, and absorptance relatively big (absorptance of silver is 20), along with incident light polarization orientation angle is different, causing that incident light polarization direction 201 is different from angle, the polarization direction θ that the base of even light pipe 105 is formed, the polarization state of reflecting light can be different therewith. When linearly polarized laser passes through the light-pipe structure with the face of being mutually perpendicular to of metal-plated membrane, the polarization direction of emergent ray and ovality form variation distribution, as shown in Figure 5. And then angle, the polarization direction θ of control incident ray polarization coherent light is adjustable from 0 ° to 45 °, it is achieved degree of polarization controls.
Claims (1)
1. one kind based on the controlled laser aid of the degree of polarization of even light pipe, it is characterized in that: the LASER Light Source (101) including linear polarization and the light source polarization direction adjusting described LASER Light Source rotation adjust frame (102), and it is 0.02 ° that light source polarization direction adjusts the degree of regulation of frame (102);The linearly polarized laser light beam sent by LASER Light Source forms incident light beam strikes inwall successively after beam expanding lens (103), plus lens (104) shaping and is coated with the even light pipe (105) of metallic reflective coating (301), and metallic reflective coating (301) is the aluminum metal film with absorbent properties; Described even light pipe (105) cross section is right angled triangle; The angle that the right-angle side that the face that is mutually perpendicular in described incident light polarization direction (201) and even light pipe (105) cross section is formed is formed is denoted as angle, polarization direction θ, and described light source polarization direction adjusts frame (102) adjustment LASER Light Source (101) rotation and makes angle, polarization direction θ adjustable from 0 ° to 45 °; Described beam expanding lens (103) is 20 power beam expansion lens; Described plus lens (104) is BK7 optical glass plus lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310391452.2A CN103441411B (en) | 2013-09-02 | 2013-09-02 | Based on the laser aid that the degree of polarization of even light pipe is controlled |
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| CN201310391452.2A CN103441411B (en) | 2013-09-02 | 2013-09-02 | Based on the laser aid that the degree of polarization of even light pipe is controlled |
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| CN103441411A CN103441411A (en) | 2013-12-11 |
| CN103441411B true CN103441411B (en) | 2016-06-15 |
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| CN112362307B (en) * | 2020-10-23 | 2022-07-29 | 北京空间机电研究所 | Double-beam-expanding cascade polarization testing system of large-caliber optical remote sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1848554A (en) * | 2004-04-05 | 2006-10-18 | Jds尤尼弗思公司 | Apparatus for emitting light with controllable degree of polarization |
| CN101247017A (en) * | 2008-01-23 | 2008-08-20 | 上海大学 | Laser capable of adjusting polarization degree |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1848554A (en) * | 2004-04-05 | 2006-10-18 | Jds尤尼弗思公司 | Apparatus for emitting light with controllable degree of polarization |
| CN101247017A (en) * | 2008-01-23 | 2008-08-20 | 上海大学 | Laser capable of adjusting polarization degree |
Non-Patent Citations (1)
| Title |
|---|
| Polarization characteristics of a linearly polarized laser beam after hollow light pipe in projectors;PengFei Zhao et al.;《Proc. SPIE 8557, Optical Design and Testing V》;20121126;第8557卷;第855722-1页倒数第2段，第855722-3页第1-2段，第855722-5页倒数第2段，第855722-6页第1段，第855722-7页第2段、图4-5 * |
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