CN114924434A - Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof - Google Patents
Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof Download PDFInfo
- Publication number
- CN114924434A CN114924434A CN202210567396.2A CN202210567396A CN114924434A CN 114924434 A CN114924434 A CN 114924434A CN 202210567396 A CN202210567396 A CN 202210567396A CN 114924434 A CN114924434 A CN 114924434A
- Authority
- CN
- China
- Prior art keywords
- faraday
- alkali metal
- temperature
- metal atom
- gas chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/091—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect based on magneto-absorption or magneto-reflection
Abstract
The invention discloses a miniature Faraday atomic filter based on Faraday anomalous dispersion and an implementation method thereof, wherein the miniature Faraday atomic filter comprises the following steps: the light-transmitting holes on two sides of the alkali metal atom gas chamber are plated with anti-reflection films with the wavelengths corresponding to the absorption lines of the alkali metal atoms, and buffer gas is filled in the anti-reflection films; the permanent magnet or the coil is wrapped around the alkali metal atom air chamber to generate a uniform strong magnetic field parallel to the light propagation direction; the first and second polaroids are respectively positioned at two sides of the alkali metal atom gas chamber and are opposite to the alkali metal atom gas chamber; the polarization directions of the two polaroids are mutually vertical; and the temperature control system is used for heating the alkali metal atom air chamber and preserving heat at the same time, detecting the temperature and controlling the temperature. The volume of the Faraday atomic filter is reduced to 1/1000 which is the mainstream, the mechanical stability is stronger, the application range is wider, the plug-and-play function is hopefully realized, and the application of the Faraday atomic filter in the fields of space communication, laser technology, quantum information, metering and the like is greatly widened.
Description
Technical Field
The invention relates to the technical field of atomic light filtering and laser, in particular to a miniature atomic light filter based on Faraday anomalous dispersion and an implementation method thereof.
Background
The Faraday atomic filter based on the Faraday anomalous dispersion effect has the advantages of narrow bandwidth, high transmittance, high signal-to-noise ratio, long-term stable operation and insensitivity to external temperature, and is suitable for severe environments with severe temperature changes, such as: and (4) field environment.
However, existing Faraday atomic filters are large in size, with most gas cell volumes greater than 5.3cm 3 And the magnetic field strength can not be generated, the Faraday rotation requirement can be met, and the magnetic field has good enough uniformity. Taking the currently mainstream cylindrical glass gas chamber with a length of 30mm and a diameter of 15mm as an example, if a magnetic field of 1000Gs is generated on the central symmetry axis, the volume of the needed magnet and the fixed structure thereof is more than 0.5dm 3 This is the main factor limiting the reduction of the volume of the atomic filter, and in this scheme, the magnetic field inhomogeneity is more than 20%, which also has little effect on the optical rotation performance of the atomic filter.
In addition to magnetic field limitations, the larger the volume of the gas cell, the more difficult it is to control the temperature of the gas cell. On the one hand, atom condensation phenomenon appears easily in the logical plain noodles at air chamber both ends in bulky atom light filter, leads to the unable normal work of atom light filter, needs comparatively complicated insulation construction design, ensures can not take place atom condensation, and this has further increased atom light filter's volume, and atom light filter's volume is greater than 1dm even 3 (ii) a On the other hand, the heating power required for heating up the large-volume atomic filter is higher, and the time required for heating up is longer, which increases the start-up time and power consumption of the atomic filter during normal operation, and is not favorable for engineering application.
Disclosure of Invention
The invention provides a miniature atomic filter based on Faraday anomalous dispersion and a realization method thereof, which overcome the problem of large volume in the existing Faraday atomic filter technology and provide a miniature atomic filter realized by utilizing a miniature atomic gas chamber and a magnet (or a spiral coil), a temperature control device and a polarizing element corresponding to the miniature atomic gas chamber, and a method for filtering light by applying the atomic filter, wherein the method is described in detail as follows:
a miniature faraday atomic filter based on faraday anomalous dispersion, the faraday atomic filter comprising:
the light-transmitting holes on two sides of the alkali metal atom gas chamber are plated with anti-reflection films with the wavelengths corresponding to the absorption lines of the alkali metal atoms, and buffer gas is filled in the anti-reflection films;
the permanent magnet or the coil is wrapped around the alkali metal atom air chamber to generate a uniform strong magnetic field parallel to the light propagation direction;
the first and second polaroids are respectively positioned at two sides of the alkali metal atom gas chamber and are opposite to the alkali metal atom gas chamber; the polarization directions of the two polaroids are mutually vertical;
and the temperature control system is used for heating the alkali metal atom air chamber and preserving heat at the same time, detecting the temperature and controlling the temperature.
Wherein the temperature control system comprises:
the heating module is used for heating the alkali metal atom air chamber and preserving heat through a heat preservation material;
a thermistor or thermocouple for temperature detection;
and the temperature feedback control circuit is used for controlling the temperature, and the temperature control precision is higher than 0.01 ℃.
Further, the first and second polarizing plates are used for polarization and polarization analysis, respectively.
The permanent magnet is a hollow cylinder, and a uniform strong magnetic field with the length matched with the length of the bubble filled with the buffer gas is generated in the center of the cylinder.
Further, the faraday atom filter further includes: and the shell is used for fixing the alkali metal atom gas chamber, the permanent magnet or the coil, the first polaroid, the second polaroid and the temperature control system.
The shell is filled with a polyurethane foam heat-insulating material serving as an inner part, and a polytetrafluoroethylene material serving as an outer material.
In a second aspect, a method for implementing filtering of a miniature faraday atomic filter based on faraday anomalous dispersion, the method comprising:
assembling a cesium atom air chamber filled with buffer gas, a permanent magnet, a first polaroid and a second polaroid together by using a designed shell, wherein a heating sheet and a thermistor on the surface of the atom air chamber are externally connected with a temperature control module;
adjusting the polarization directions of the first polarizer and the second polarizer to be mutually orthogonal;
raising the temperature, splitting the cesium atom absorption line in the gas chamber under the action of a magnetic field, so that the cesium atom absorption line is divided into two cesium atom absorption lines, the left-handed circularly polarized light and the right-handed circularly polarized light in the incident light have optical path difference after passing through the cesium atom gas chamber, and the polarization direction of linearly polarized light superposed by the left-handed circularly polarized light and the right-handed circularly polarized light rotates to realize optical rotation;
adjusting the temperature to select the most suitable working point.
The technical scheme provided by the invention has the beneficial effects that:
1. the volume of the Faraday atomic filter is reduced to 1/1000 which is the mainstream, the mechanical stability is stronger, the application range is wider, the plug-and-play function is hopefully realized, and the application of the Faraday atomic filter in the fields of space communication, laser technology, quantum information, metering and the like is greatly widened;
2. the micro Faraday atomic filter designed by the invention can generate a uniform strong magnetic field in the range of the alkali metal atom air chamber more easily, and the optical rotation performance of the atomic filter is improved;
3. because the volume of the alkali metal atom air chamber in the miniature atom optical filter is small, a temperature control system with better temperature control effect is easy to design, and the anti-interference capability of the atom optical filter to the external temperature change is enhanced while the power consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of a micro Faraday atomic filter;
wherein: 1. a first polarizing plate; 2. a permanent magnet or coil; 3. an alkali metal atom gas cell; 4. a second polarizing plate; 5. a temperature control system. The arrow direction is the light transmission direction, and the direction of B is the magnetic field direction.
FIG. 2 is a schematic diagram of the magnetic field distribution within a 3mm gas cell in the micro Faraday atomic filter;
FIG. 3 is a flow chart of filtering by a miniature Faraday atom filter;
fig. 4 is a schematic diagram showing the effect of one embodiment of the miniature faraday atom filter.
Wherein the magnetic field intensity is 1000Gs, the pressure of the buffer gas is 5 Torr, and the curves are respectively the transmission spectra of the atomic filter at different temperatures.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
Example 1
A miniature faraday atom filter, see figure 1, comprising:
a micro alkali metal atom gas chamber 3 made of quartz or glass, wherein light through holes on two sides of the alkali metal atom gas chamber 3 are plated with anti-reflection films with the wavelengths corresponding to the absorption lines of the alkali metal atoms, and buffer gas is filled in the alkali metal atom gas chamber 3;
a permanent magnet or coil 2 wrapped around the alkali metal atom gas chamber 3 to generate a uniform strong magnetic field parallel to the light propagation direction;
the first polaroid 1 and the second polaroid 4 are respectively positioned at two sides of the alkali metal atom gas chamber 3 and are opposite to the alkali metal atom gas chamber; the polarization directions of the two polaroids (1 and 4) are mutually vertical;
and the temperature control system 5 is used for heating the alkali metal atom air chamber 3 by using an internal heating module, preserving heat by using a heat preservation material with the heat conductivity coefficient lower than 0.05W/(m × K), detecting the temperature by using an internal thermistor or thermocouple by using the temperature control system 5, and controlling the temperature by using a self-contained temperature feedback control circuit, wherein the temperature control precision is higher than 0.01 ℃.
Further, the miniature faraday atom filter further comprises: and the shell is used for fixing the elements (the parts are numbered as 1-5) and enhancing the heat preservation.
Example 2
The solution of example 1 is further described below with reference to fig. 2 and 3, and is described in detail below:
fig. 1 is a schematic structural diagram of a micro faraday atom filter designed in the embodiment of the present invention. The atomic filter is composed of: the device comprises a first polaroid 1, a permanent magnet or a coil 2, atomic bubbles 3 filled with inert gas in an atomic gas chamber 3, a second polaroid 4 and a temperature control system 5.
The first polarizer 1 is a polarizing element, and only when the polarization direction of the laser is the same as the direction of the first polarizer 1, the laser can pass through, and the splitting ratio in the use wavelength range of the first polarizer 1 is greater than 1000: 1. the polarization directions of the first and second polarizers 1 and 4 are shown by white arrows (one horizontal arrow and one vertical arrow) in fig. 1, and the two arrows are orthogonal to each other. The first and second polarizers 1 and 4 are respectively arranged at two ends of the atomic gas chamber 3 and are parallel to two end surfaces of the atomic gas chamber 3, so as to play a role in polarization and polarization analysis.
The alkali metal atom gas chamber 3 in the embodiment of the present invention is illustrated by taking cesium atom bubbles filled with an inert gas as an example, and other types of atom bubbles may be selected for specific implementation, which is not limited in the embodiment of the present invention.
Before the temperature control system 5 is not warmed up, the incident light will not pass through the second polarizer 4 after passing through the first polarizer 1. Because permanent magnet 2 is a hollow cylinder, can produce a section length and the even high magnetic field that cesium atom bubble length suits in the cylinder center, compare with the magnetic field generating device among the prior art, this permanent magnet 2's structure is small, the magnetic field intensity who produces is big, the homogeneity is good, has important meaning to promoting faraday atom optical filter's optical rotation performance.
Wherein cesium atom bubbles 3 filled with an inert gas are provided at the center position of the permanent magnet 2. The laser light enters the hollow permanent magnet 2 after entering the first polarizing plate 1, passes through the cesium atom bubbles 3, and finally exits the second polarizing plate 4. The heating module and the temperature sensor of the temperature control system 5 are tightly attached to the surface of the cesium atom bubble and connected with the temperature feedback control circuit of the temperature control system, so that the temperature control of the cesium atom bubble 3 is realized.
In the above embodiments, the first and second polarizers 1 and 4 are preferably circular thin film polarizers, which are much smaller than other polarizing elements, and may be replaced with polarizing beam splitting prisms or glantrier prisms having a higher splitting ratio.
Further, the atomic bubbles 3 are preferably made of quartz, and have a higher transmittance than ordinary glass. The inert gas is argon or xenon, and the gas pressure is preferably 0.1 to 50 torr. The heating module is preferably a heating wire or a heating film, and the temperature sensor is preferably a thermistor or a thermocouple. Since the bubble length in the micro faraday atom filter is reduced to one tenth of that of the past atom filter, in order to achieve the same optical rotation effect, the atom density in the air chamber needs to be increased by raising the temperature of the air chamber, so the preferred working temperature range of the atom air chamber 3 is 60-150 ℃.
In the above example, a strong uniform magnetic field having a length of 3mm can be generated at the center of the cylinder by the permanent magnet 2, the magnetic field strength is preferably 100 to 1200Gs, and the variation of the magnetic field strength can be realized by changing the inner and outer diameters of the permanent magnet 2. For a permanent magnet with magnetic field strength of 1000Gs, the inner diameter is 4mm, the outer diameter is 28mm, the length of the cylinder is 8mm, the uniformity of the magnetic field is more than 95%, and the magnetic field distribution along the light propagation direction in the range of atomic gas cells is shown in FIG. 2.
Example 3
In order to solve the problems that the conventional Faraday atomic filter is large in size, difficult to generate a uniform strong magnetic field and high in power consumption, the embodiment of the invention designs a miniature alkali metal atomic gas chamber 3 which is a cylinder with the length of 3mm and the diameter of 3mm and has the volume of 21.2mm 3 Applied to atomic filters.
Based on the alkali metal atom gas chamber 3, a set of magnetic field device matched with the alkali metal atom gas chamber is designed, and the volume of the magnetic field device is 0.98cm 3 The field strength is 1000Gs in the 3mm range and the field homogeneity is greater than 95%, which produces a larger, more massive field with a smaller volume than the previous mainstream field solutionsA uniform magnetic field.
The volume of the air chamber is reduced by 250 times (from 5.3cm of the main flow) 3 Reduce to 21.2mm 3 ) And then, the phenomenon of atom condensation on the end face of the air chamber can be well avoided, the heat insulation structure is simpler, the size of the atom filter can be further reduced, the heating power required by the temperature rise of the air chamber is greatly reduced, and the power consumption of the system is greatly reduced.
Meanwhile, the volume of the atomic filter can be compressed to the limit by replacing the polarizing element in the mainstream faraday atomic filter by a cube-type polarization splitting prism and a Glan Taylor prism with the length, width and height of 25.4mm with a circular thin film polarizing plate with the diameter of 12.7mm and the thickness of 0.55 mm. Through comprehensive design in many aspects, the total volume of the miniature Faraday atomic filter is 1.1cm 3 1/1000, which is the volume of the mainstream faraday atom filter. In addition, the Faraday filter has the advantages of quick start, low power consumption, more stable mechanical structure and stronger anti-interference performance, and is expected to realize plug-and-play Faraday filters.
Example 4
A method for realizing the light filtering by applying the miniature Faraday atom light filter comprises the following steps:
polyurethane foam heat-insulating material is used as internal filling, polytetrafluoroethylene material is used as a shell, and the shell is designed to wrap an atomic air chamber. The shell is utilized to assemble a micro coating alkali metal atom bubble 3 filled with buffer gas, a micro annular permanent magnet 2, a temperature control system 5 and two circular thin film polaroids (1 and 4) into the atom light filter;
adjusting the first and second polarizing plates (1 and 4) at both ends of the atomic bubble to be orthogonal to each other;
the temperature of the atomic bubbles is raised by using a temperature control system 5, and at the moment, the incident light is optically rotated due to the Faraday effect of alkali metal atoms in a uniform magnetic field to obtain a transmission spectrum;
the temperature of the atomic bubbles is controlled by the temperature control system 5, so that the transmittance and the line width of the transmission spectrum are comprehensively optimized.
The embodiment of the invention realizes filtering by utilizing the Faraday optical rotation effect of alkali metal gas on incident laser under the action of a strong magnetic field, and the volume of the embodiment is only 1/200 of the traditional Faraday atom filter. A uniform strong magnetic field with the length of 3mm is generated at the center of the magnet along the light propagation direction by using an annular permanent magnet with the inner diameter of 10.5mm, the outer diameter of 12.5mm and the thickness of 8 mm. Under the action of a strong magnetic field, the absorption lines of alkali metal atoms are split under the action of the Zeeman effect and divided into two absorption lines which respectively correspond to absorption lines of right-handed circularly polarized light and left-handed circularly polarized light, and the frequencies of the two absorption lines are slightly different. At the moment, left-handed circularly polarized light and right-handed circularly polarized light in the incident laser have different dispersion curves when passing through the alkali metal atomic gas, so that the left-handed circularly polarized light and the right-handed circularly polarized light have phase difference after passing through the atomic gas chamber, and the polarization direction of linearly polarized light formed by the superposition of the left-handed circularly polarized light and the right-handed circularly polarized light is changed.
Incident laser light is frequency-selected by two mutually orthogonal first and second thin film polarizers 1 and 4, and only incident light with a frequency near an atomic absorption line can be emitted under the action of an optical rotation effect. The temperature of the atomic bubbles is accurately controlled by the temperature control system 5, so that the atomic bubbles always work at the optimal working temperature. The shell of above-mentioned design plays the effect of fixed all components on the one hand, and on the other hand plays heat retaining effect, has strengthened the interference killing feature of miniature faraday atomic filter to ambient temperature.
The miniature Faraday atomic optical filter designed by the embodiment of the invention greatly reduces the volume of the Faraday atomic optical filter, obtains a more uniform strong magnetic field, reduces the power consumption, has stronger mechanical stability, is insensitive to external mechanical vibration and temperature change, is suitable for various severe environments with large vibration and temperature change such as field or vehicle-mounted environment, and is expected to realize the plug-and-play function of the Faraday atomic optical filter (because the Faraday atomic optical filter can not change the propagation direction of a light path, the plug-and-play function can be realized by directly placing the Faraday atomic optical filter in the light path), and has important significance for scientific research and industrial application related to atomic optical filtering.
Example 5
The method steps of example 4 are further described below in conjunction with fig. 3 and 4, and are described in detail below:
step 101: assembling a cesium atom air chamber 3 filled with buffer gas, a permanent magnet 2, a first film polaroid 1 and a second film polaroid 4 together by using a designed shell, wherein a heating sheet and a thermistor on the surface of the atom air chamber 3 are externally connected with a temperature control module;
step 102: adjusting the polarization directions of the first and second thin film polarizers 1 and 4 to be orthogonal to each other, wherein the Faraday optical effect is weak because the temperature is not raised, and the incident light cannot exit from the second thin film polarizer 4;
step 103: raising the temperature, splitting the cesium atom absorption lines in the gas chamber under the action of a magnetic field into two cesium atom absorption lines, so that the left-handed circularly polarized light and the right-handed circularly polarized light in the incident light have optical path difference after passing through the cesium atom gas chamber 3, and rotating the polarization direction of linearly polarized light superposed by the left-handed circularly polarized light and the right-handed circularly polarized light to realize optical rotation;
in specific implementation, when the temperature rises, the cesium atom absorption lines are split into two absorption lines under the action of a magnetic field, and the two absorption lines respectively correspond to absorption lines of left-handed circularly polarized light and absorption lines of right-handed circularly polarized light, and the frequencies of the absorption lines are slightly different. And the left-handed circularly polarized light and the right-handed circularly polarized light have different dispersion curves, and the refractive indexes of the left-handed circularly polarized light and the right-handed circularly polarized light are different when the left-handed circularly polarized light and the right-handed circularly polarized light pass through the atomic gas chamber, so that optical path difference is generated, and the phase difference of the left-handed circularly polarized light and the right-handed circularly polarized light after the left-handed circularly polarized light and the right-handed circularly polarized light are emitted from the gas chamber is changed relative to the phase difference before the left-handed circularly polarized light and the right-handed circularly polarized light enter the gas chamber due to the optical path difference.
When the left circularly polarized light and the right circularly polarized light are superimposed to form linearly polarized light, the polarization direction of the linearly polarized light is directly related to the phase difference between the left circularly polarized light and the right circularly polarized light, and the phase difference is changed, so that the polarization direction of the linearly polarized light is rotated, that is, a faraday optical rotation effect is generated, and is a known physical phenomenon in the art, which is not described in detail herein.
Wherein, the incident light near the frequency of atomic absorption peak can be emitted from the second film polarizer 4 after optical rotation, while the incident light far away from the frequency of absorption peak can not be emitted, thus realizing frequency selection of the incident light.
Step 104: adjusting the temperature to select the most suitable working point.
However, when the temperature is changed, the rotation angle of the polarization direction of incident light is changed, and the absorption of cesium atoms is also changed, and the final transmission spectrum is determined by both of these factors, so that it is necessary to select an optimum temperature so as to have a transmittance as high as possible.
For example: when the buffer gas pressure is 5 torr and the magnetic field strength is 1000 gauss, the optimal temperature is 75.5 ℃, and the transmittance is highest.
The miniature Faraday atomic filter of the embodiment greatly reduces the volume of the Faraday atomic filter, improves the anti-interference capability of the atomic filter on mechanical vibration and greatly reduces the power consumption of the atomic filter by designing the miniature atomic air chamber 3 and the corresponding annular permanent magnet 2 and adopting the first and second thin film polarizing films 1 and 4 to replace a polarization beam splitter prism and a Glan Taylor prism.
The embodiment of the invention adopts a brand-new designed magnetic field generation scheme, realizes a more uniform strong magnetic field by using the permanent magnet 3 with smaller volume, and improves the optical rotation performance of the atomic filter. Through better heat preservation measure and the higher feedback control circuit of control by temperature change precision, when promoting 5 stability of temperature control system, promoted atomic filter to the interference killing feature of ambient temperature change.
FIG. 4 is a diagram showing the effect of the micro Faraday atomic filter in the above embodiment, wherein the magnetic field strength is 1000 Gauss, the buffer gas pressure is 5 Torr, the abscissa is the measuring laser frequency, and the zero point of the abscissa corresponds to the cesium atom 6 2 S 1/2 F-4 to 6 2 P 3/2 F ═ 3 transition frequency. The ordinate is the absolute transmission of the micro faraday atomic filter. Different color curves correspond to the transmission spectra at different temperatures. The data set on the right of fig. 4 shows the maximum transmission and the full width at half maximum of the transmission peak of the transmission spectrum of the atomic filter at different temperatures.
The above embodiments are merely to illustrate the principle of the embodiment of the present invention, and the volume of the atomic gas cell 3 and the magnetic field strength of the permanent magnet 2 in the atomic filter can be changed, and are not limited to the embodiments of the present invention, for example: the volume of the atomic cell 3 becomes 30mm 3 Or 15mm 3 The magnetic field strength becomes 800Gs or 1200 Gs.
In the embodiment of the present invention, except for the specific description of the model of each device, the model of other devices is not limited as long as the device can perform the above functions.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-mentioned serial numbers of the embodiments of the present invention are only for description and do not represent the merits of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A miniature faraday atomic filter based on faraday anomalous dispersion, said faraday atomic filter comprising:
the light-transmitting holes on two sides of the alkali metal atom gas chamber are plated with antireflection films with the wavelengths corresponding to the absorption lines of the alkali metal atoms, and buffer gas is filled in the alkali metal atom gas chamber;
the permanent magnet or the coil is wrapped around the alkali metal atom air chamber to generate a uniform strong magnetic field parallel to the light propagation direction;
the first and second polaroids are respectively positioned at two sides of the alkali metal atom gas chamber and are opposite to the alkali metal atom gas chamber; the polarization directions of the two polaroids are mutually vertical;
and the temperature control system is used for heating the alkali metal atom air chamber and preserving heat at the same time, detecting the temperature and controlling the temperature.
2. A faraday atomic filter based on faraday anomalous dispersion according to claim 1 and characterised in that said temperature control system comprises:
the heating module is used for heating the alkali metal atom air chamber and preserving heat through a heat preservation material;
a thermistor or thermocouple for temperature detection;
and the temperature feedback control circuit is used for controlling temperature, and the temperature control precision is higher than 0.01 ℃.
3. A miniature faraday atomic filter based on faraday anomalous dispersion as defined in claim 1 wherein said first and second polarizers are used for polarization and polarization analysis, respectively.
4. A miniature Faraday atomic filter according to claim 1, wherein the permanent magnet is a hollow cylinder, and a strong, uniform magnetic field is generated in the center of the cylinder, the length of the strong magnetic field being adapted to the length of the gas bubbles filled with the buffer gas.
5. A faraday atomic filter based on faraday anomalous dispersion according to claim 1 and characterised in that said faraday atomic filter further comprises: and the shell is used for fixing the alkali metal atom gas chamber, the permanent magnet or the coil, the first polaroid, the second polaroid and the temperature control system.
6. A miniature Faraday atomic filter according to claim 1, based on Faraday anomalous dispersion, wherein said housing is internally filled with polyurethane foam insulation and wherein a polytetrafluoroethylene material is used as an outer material.
7. A method for implementing filtering of a miniature faraday atomic filter based on faraday anomalous dispersion, the method comprising: assembling a cesium atom air chamber filled with buffer gas, a permanent magnet, a first polaroid and a second polaroid together by using a designed shell, wherein a heating sheet and a thermistor on the surface of the atom air chamber are externally connected with a temperature control module;
adjusting the polarization directions of the first and second polaroids to be orthogonal to each other;
raising the temperature, splitting the cesium atom absorption line in the gas chamber under the action of a magnetic field, so that the cesium atom absorption line is divided into two cesium atom absorption lines, the left-handed circularly polarized light and the right-handed circularly polarized light in the incident light have optical path difference after passing through the cesium atom gas chamber, and the polarization direction of linearly polarized light superposed by the left-handed circularly polarized light and the right-handed circularly polarized light rotates to realize optical rotation;
adjusting the temperature to select the most suitable working point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210567396.2A CN114924434A (en) | 2022-05-24 | 2022-05-24 | Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210567396.2A CN114924434A (en) | 2022-05-24 | 2022-05-24 | Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114924434A true CN114924434A (en) | 2022-08-19 |
Family
ID=82810981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210567396.2A Pending CN114924434A (en) | 2022-05-24 | 2022-05-24 | Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114924434A (en) |
-
2022
- 2022-05-24 CN CN202210567396.2A patent/CN114924434A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108844532B (en) | Microminiature nuclear magnetic resonance gyroscope using oblique incidence detection light path | |
| Rikken et al. | Observation of magnetoelectric directional anisotropy | |
| CN108667454B (en) | High-uniformity low-temperature-coefficient cavity bubble system | |
| CN106253040B (en) | A kind of mode locked fiber laser system by graphene speculum wavelength switching | |
| CN106654823B (en) | Pass through the mode locked fiber laser system of collimator wavelength switching | |
| CN103701030B (en) | A kind of unimodal for laser frequency stabilization 87rb isotope atom filter and filtering method thereof | |
| CN110473649B (en) | Asymmetric two-dimensional magneto-optical trap method and device for preparing ultra-long cold atom cloud | |
| CN105470791B (en) | Space structure optical fiber laser based on two-dimension nano materials mode locking | |
| JPH02302717A (en) | Optical isolator | |
| CN104242044A (en) | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method | |
| CN114924434A (en) | Miniature atomic optical filter based on Faraday anomalous dispersion and implementation method thereof | |
| CN100464208C (en) | Single beam magneto-optic well system | |
| CN105700059B (en) | Dual wavelength optical phase delay device | |
| Gentile et al. | Comparison of metastability-exchange optical pumping sources | |
| JPS60203914A (en) | Variable wavelength filter | |
| Doyle et al. | FREQUENCY SPLITTING AND MODE COMPETITION IN A DUAL‐POLARIZATION He‐Ne GAS LASER | |
| CN112013828A (en) | Nuclear magnetic resonance gyroscope with integrated pumping laser and atomic gas chamber | |
| Bi et al. | Ultra-narrow linewidth optical filter based on Faraday effect at isotope 87Rb 420 nm transitions | |
| CN115173216A (en) | Magic cavity length laser with frequency-to-cavity length thermal noise immunity and implementation method | |
| CN103605207A (en) | Light-operated echo wall mode generating system based on azobenzene material | |
| Ino et al. | Development of 3He polarized neutron spin filters at KEK | |
| CN112600058A (en) | Based on Rb87Modulation transfer spectrum frequency stabilization light path structure | |
| Guan et al. | 420 nm Faraday optical filter with 2.7 MHz ultranarrow bandwidth based on laser cooled 87 Rb atoms | |
| Pan et al. | Metastable helium Faraday filter for helium lidar to measure the density of the thermosphere | |
| CN111175893A (en) | Microstructure optical fiber polarizer with adjustable working wavelength |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |