CN213022834U - Light path regulation and control device - Google Patents
Light path regulation and control device Download PDFInfo
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- CN213022834U CN213022834U CN202021172118.XU CN202021172118U CN213022834U CN 213022834 U CN213022834 U CN 213022834U CN 202021172118 U CN202021172118 U CN 202021172118U CN 213022834 U CN213022834 U CN 213022834U
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Abstract
The utility model discloses a light path regulating device, which comprises a first lens and a second lens which are both focusing lenses, wherein the first lens and the second lens are arranged in a confocal way; the first lens, the second lens and the first polarizer are sequentially arranged along the direction of the laser emergent light source, and the light source enters the prism after passing through the first polarizer; the quarter-wave plate, the half-wave plate and the second polarizer are sequentially arranged along the direction of the light source reflected by the prism, and the light source enters the image sensor after passing through the second polarizer; the electromagnet is arranged above and/or below the prism, and the magnetic induction direction is vertical to the vertical axis of the prism; the prism inclined plane is attached with a one-dimensional photonic crystal; a heating plate is arranged above the prism; the utility model has the advantages that the temperature is determined by using the Gus Hansen displacement value amplified by weak measurement in the magnetic field intensity environment; the magnetic field intensity is determined through the amplified Gus Hansen displacement at a certain temperature.
Description
Technical Field
The utility model relates to an optical displacement measurement field especially relates to a light path regulation and control device.
Background
The goos-hansen shift (GH) refers to the lateral offset parallel to the plane of incidence of the center of the reflected beam relative to the center of the incident beam at the interface of the two media. This shift is due to the phase change produced by each plane wave making up the beam, and was found experimentally in goos-hansen in 1947. Typically, GH shifts are on the order of wavelengths, which prevents direct observation in a single reflection, and cannot be directly manipulated for goos hansen shifts.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: to the problem that above-mentioned exists, provide a light path regulation and control device, through after taking place the reflection of the ancient Hansen displacement in one-dimensional photonic crystal structure, can produce sensitive regulation and control effect to the ancient Hansen displacement when can enlargiing.
The utility model adopts the technical scheme as follows:
an optical path regulating device comprises a laser, a first lens, a second lens, a first polarizer, a prism, a quarter-wave plate, a half-wave plate, a second polarizer and an image sensor, wherein the laser is used for generating laser light sources with different wavelengths; the first lens and the second lens are both focusing lenses, and are arranged in a confocal manner; the first lens, the second lens and the first polarizer are sequentially arranged along the direction of the laser emergent light source, and the light source enters the prism after passing through the first polarizer; the quarter-wave plate, the half-wave plate and the second polarizer are sequentially arranged along the direction of the light source reflected by the prism, and the light source enters the image sensor after passing through the second polarizer; the electromagnets are arranged above and/or below the prism, and the magnetic induction direction is vertical to the vertical axis of the prism; the prism inclined plane is attached with a one-dimensional photonic crystal; and a heating plate is arranged above the prism.
The traditional Gus Hansen displacement measurement method can only change the temperature independently or adjust and control the change of the magnetic field intensity independently under the condition of only a magnetic field; the utility model provides a light path regulation and control device takes place barycenter lateral displacement through adopting on one-dimensional photonic crystal surface, has realized regulating and controlling temperature or magnetic field at the ancient Hansen displacement device under the complex environment, has promoted the measuring precision under the complex environment.
Furthermore, the one-dimensional photonic crystal comprises graphene layers and vanadium dioxide layers, wherein the graphene layers and the vanadium dioxide layers are alternately arranged in a periodic mode, and the calculation shows that the best effect can be achieved when the period number is 20.
Furthermore, the first polarizer and the second polarizer are both a glan laser polarizer.
The Glan laser polarizer has the advantages of covering ultraviolet light, visible light and intermediate infrared light with bandwidth, enabling the polarization angle to be close to the Brewster cutting angle, being high in polarization degree, being air-gap and the like, and enabling the polarization degree of emergent polarized light to be better.
Furthermore, the frequency of the laser light source emitted by the laser is 5 THz.
Further, the prism is a BK7 prism.
The BK7 prism has good transmittance of visible spectrum, contains less bubbles or impurities, and has a low level of stripe and refractive index unevenness which have an adverse effect on the optical system.
Further, the focal length of the first lens is 125 mm; the focal length of the second lens is 250 mm.
The first lens is mainly used for focusing, and focusing light spots incident on the sample to a proper size; the second lens is mainly used for collimation.
The utility model also discloses a regulation and control method of light path regulation and control device, regulation and control method step based on the regulation and control device of goos hansen displacement includes:
A. the method comprises the following steps of sequentially building a first lens, a second lens, a first polarizer and a prism along the direction of a laser emergent light source, and sequentially building a quarter-wave plate, a half-wave plate, a second polarizer and an image sensor along the direction of a prism emitting light source;
B. adjusting the first polarizer and the second polarizer until the light intensity reflected from the prism presents a light spot split left and right;
C. slowly rotating the prism and finely adjusting the quarter-wave plate and the half-wave plate at the same time until the image sensor presents light spots which are equal in size and intensity and are mutually symmetrical;
D. controlling the magnetic field intensity to be unchanged by adopting a variable control method, and changing the temperature of the heating plate to change the range of the mass center displacement on the image sensor to be 0-800 wavelengths; the centroid displacement on the image sensor is the goos hansen displacement.
Furthermore, the temperature of the heating plate ranges from 298k to 358 k.
The utility model also discloses a light path regulation and control device, regulation and control method step based on regulation and control device of Gus Hansen displacement includes:
A. the method comprises the following steps of sequentially building a first lens, a second lens, a first polarizer and a prism along the direction of a laser emergent light source, and sequentially building a quarter-wave plate, a half-wave plate, a second polarizer and an image sensor along the direction of a prism emitting light source;
B. adjusting the first polarizer and the second polarizer until the light intensity reflected from the prism presents a light spot split left and right;
C. slowly rotating the prism and finely adjusting the quarter-wave plate and the half-wave plate at the same time until the image sensor presents light spots which are equal in size and intensity and are mutually symmetrical;
D. the temperature is controlled to be unchanged by adopting a variable control method, and the intensity of the magnetic field is changed, so that the variation range of the mass center displacement on the image sensor is 0-800 wavelengths; the centroid displacement on the image sensor is the goos hansen displacement.
Furthermore, the magnetic field intensity can be changed within the range of 0-10T.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. by adopting the light path regulating and controlling device provided by the utility model, the temperature of the device can be determined by using the Gus Hansen displacement value amplified by weak measurement in the magnetic field intensity environment;
2. adopt the utility model provides a pair of light path regulation and control device has realized confirming magnetic field intensity through the ancient Hansen displacement after enlarging under the uniform temperature.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a Gus Hansen displacement control device
FIG. 2 is a schematic diagram of a prism and a one-dimensional photonic crystal
FIG. 3 is a graphical representation of Gus Hansen displacement versus conductivity
FIG. 4 is a graph illustrating the magnetic field variation and Gus Hansen shift
FIG. 5 is a graph of the Gus Hansen displacement at different temperatures for a constant magnetic field strength
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Implementation scheme one
The embodiment discloses a light path regulating device, as shown in fig. 1, comprising a laser 1, a first lens 2, a second lens 3, a first polarizer 4, a prism 5, a quarter-wave plate 6, a half-wave plate 7, a second polarizer 8 and an image sensor 9, wherein the laser is used for generating laser light sources with different wavelengths; the frequency of the laser light source emitted by the laser is 5 THz; the first lens and the second lens are both focusing lenses, and are arranged in a confocal manner; the focal length of the first lens is 125 mm; the focal length of the second lens is 250mm, the position of the first polarizer is at the focal length of the second lens, the first lens is a focused light beam, and the second lens is mainly used for collimating the light beam; the first lens, the second lens and the first polarizer are sequentially arranged along the direction of the laser emergent light source, and the light source enters the prism after passing through the first polarizer; the quarter-wave plate, the half-wave plate and the second polarizer are sequentially arranged along the direction of the light source reflected by the prism, the light source enters the image sensor after passing through the second polarizer, the quarter-wave plate is mainly used for offsetting the phase difference between an s-polarization component and a p-polarization component in the total reflection process, the half-wave plate is mainly used for adjusting the light intensity of the laser, the maximum light intensity range borne by the image sensor is avoided being exceeded, and the polarization state of the polarized light can be rotated by 90 degrees; the first polarizer and the second polarizer are both a Glan laser polarizer; the electromagnet is arranged above and/or below the prism, the magnetic induction direction is vertical to the vertical axis of the prism, the magnetic field intensity of the electromagnet can be changed according to the intensity of the electrified intensity, the magnetic field intensity is changed to a fixed value, and meanwhile, the direction of the magnetic field intensity can be controlled; the prism inclined plane is attached with a one-dimensional photonic crystal; the one-dimensional photonic crystal comprises a graphene layer 11 and a vanadium dioxide layer 12, wherein the graphene layer and the vanadium dioxide layer are alternately arranged in a periodic manner, and the optimal effect can be achieved when the number of periods is 20 through calculation; a heating plate 10 is arranged above the prism; the prism is a BK7 prism.
Example II
The embodiment discloses a regulation and control method of a light path regulation and control device based on the first embodiment, and the regulation and control method of the regulation and control device based on the Gus Hansen displacement comprises the following steps:
A. along the direction of laser outgoing light source, build first lens in proper order, second lens, first polarizer and prism, build quarter-wave plate, half-wave plate, second polarizer and image sensor in proper order along prism transmitting light source direction, all optical components who build are equal height coaxial optical components, guarantee that optical components is on the axle of same light path, the second lens can be used for collimated light beam, when the light beam passes through first lens and second lens and gets into BK7 prism through first polarizer, incident light can take place to reflect and form P polarized light and s polarized light at the photonic crystal surface.
B. Adjusting the first polarizer and the second polarizer until the light intensity reflected from the prism presents a light spot split left and right; when the light spots split left and right are adjusted, the P polarization state and Brewster angle of the first polarizer are realized, and the same is true for the second polarizer;
C. slowly rotating the prism and finely adjusting the quarter-wave plate and the half-wave plate at the same time until the image sensor presents light spots which are equal in size, same in intensity and symmetrical to each other, and the incidence is totally reflected at the moment;
D. controlling the magnetic field intensity to be unchanged by adopting a variable control method, and changing the temperature of the heating plate to change the range of the mass center displacement on the image sensor to be 0-800 wavelengths; the mass center displacement on the image sensor is Gus Hansen displacement; the temperature of the heating plate ranges from 298k to 358 k.
Example III
The embodiment is a regulation and control method of a light path regulation and control device based on the first embodiment and the second embodiment, and the regulation and control method of the regulation and control device based on the Gus Hansen displacement comprises the following steps:
A. the method comprises the following steps that a first lens, a second lens, a first polarizer and a prism are sequentially built along the direction of a laser emitting light source, a quarter-wave plate, a half-wave plate, a second polarizer and an image sensor are sequentially built along the direction of a prism emitting light source, all built optical components are equal-height coaxial optical components, the optical components are ensured to be on the same optical path axis, the second lens can be used for collimating light beams, when the light beams pass through the first lens and the second lens and enter a BK7 prism through the first polarizer, incident light can be reflected on the surface of a photonic crystal and form P polarized light and s polarized light;
B. adjusting the first polarizer and the second polarizer until the light intensity reflected from the prism presents a light spot split left and right; when the light spots split left and right are adjusted, the P polarization state and Brewster angle of the first polarizer are realized, and the same is true for the second polarizer;
C. and slowly rotating the prism and finely adjusting the quarter-wave plate and the half-wave plate at the same time until the image sensor presents light spots which are equal in size, same in intensity and symmetrical to each other, and the incidence at the moment is totally reflected.
D. The temperature is controlled to be unchanged by adopting a variable control method, and the intensity of the magnetic field is changed, so that the variation range of the mass center displacement on the image sensor is 0-800 wavelengths; the mass center displacement on the image sensor is Gus Hansen displacement; the magnetic field intensity variation range is 0-10T.
Example four
The present embodiment discloses a method for adjusting and controlling a light path adjusting and controlling device based on the second embodiment and the third embodiment, as shown in fig. 3 and 4, fig. 3 shows that the magnetic field size B is 10T, the incident frequency is 5THz, and the fermi level E isFIn the case of an experiment of 0.4eV and a relaxation time τ of 1ps, the change in conductivity and S were experimentally measuredGHAn approximately linear relationship is presented. The SGH decreases approximately linearly with increasing conductivity, as shown in FIG. 4, at an incident angle of 41.2 degrees, an incident frequency of 5THz, and a Fermi level EF0.4eV, a relaxation time τ of 1ps, and an amplification angle ΔUnder the condition of 0, when the electric conductivities of the insulation state and the metal state are respectively 200S/m and 200000S/m, the relationship between the Gus Hansen displacement and the magnetic field intensity, S, can be obtained through experimentsGHBoth increase with increasing magnetic field. As shown in fig. 5, the graph is based on the change of the goos hansen shift with the change of the incident angle under the condition that the magnetic field intensity is constant and under different temperatures.
To sum up, the utility model provides a light path regulation and control device, through the one-dimensional photonic crystal that adopts vanadium dioxide and graphite alkene to constitute, the optical speed that adopts the frequency to send for 5THz laser source is at one-dimensional photonic crystal surface normal transverse displacement, has realized can regulating and control the purpose of temperature under the magnetic field environment to and regulate and control the purpose of magnetic field intensity under the environment of temperature, and has strengthened the feasibility of weak measurement technique.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (6)
1. An optical path adjusting device, characterized in that: the laser comprises a laser, a first lens, a second lens, a first polarizer, a prism, a quarter-wave plate, a half-wave plate, a second polarizer and an image sensor, wherein the laser is used for generating laser light sources with different wavelengths; the first lens and the second lens are both focusing lenses, and are arranged in a confocal manner; the first lens, the second lens and the first polarizer are sequentially arranged along the direction of the laser emergent light source, and the light source enters the prism after passing through the first polarizer; the quarter-wave plate, the half-wave plate and the second polarizer are sequentially arranged along the direction of the light source reflected by the prism, and the light source enters the image sensor after passing through the second polarizer; electromagnets are arranged above and/or below the prism, and the magnetic induction direction is vertical to the vertical axis of the prism; the prism inclined plane is attached with a one-dimensional photonic crystal; and a heating plate is arranged above the prism.
2. An optical path adjustment device according to claim 1, wherein: the one-dimensional photonic crystal comprises a graphene layer and a vanadium dioxide layer, wherein the graphene layer and the vanadium dioxide layer are alternately arranged periodically.
3. An optical path adjustment device according to claim 1 or 2, wherein: the first polarizer and the second polarizer are both Glan laser polarizers.
4. An optical path adjustment device according to claim 3, wherein: the frequency of the laser light source emitted by the laser is 5 THz.
5. An optical path conditioning device according to claim 4, characterized in that: the prism is a BK7 prism.
6. An optical path adjustment device according to any one of claims 1, 2, 4 and 5, wherein: the focal length of the first lens is 125 mm; the focal length of the second lens is 250 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021172118.XU CN213022834U (en) | 2020-06-22 | 2020-06-22 | Light path regulation and control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021172118.XU CN213022834U (en) | 2020-06-22 | 2020-06-22 | Light path regulation and control device |
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| Publication Number | Publication Date |
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| CN213022834U true CN213022834U (en) | 2021-04-20 |
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| CN202021172118.XU Active CN213022834U (en) | 2020-06-22 | 2020-06-22 | Light path regulation and control device |
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