CN116931287A - Ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and implementation method thereof - Google Patents
Ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and implementation method thereof Download PDFInfo
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- 230000010287 polarization Effects 0.000 claims abstract description 98
- 150000001340 alkali metals Chemical group 0.000 claims abstract description 52
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 230000007704 transition Effects 0.000 claims description 22
- 230000003595 spectral effect Effects 0.000 claims description 7
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- 230000000644 propagated effect Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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Abstract
The invention discloses an ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and an implementation method thereof, comprising the following steps: the incident light passes through the 1/2 wave plate, the permanent magnet providing axial magnetic field and the center of the alkali metal atom air chamber; placing a power meter behind the polarization beam splitting module, and rotating a 1/2 wave plate to enable incident linearly polarized light to penetrate the center of the polarization beam splitting module to the greatest extent; setting the temperature of the alkali metal atom air chamber through an alkali metal atom air chamber heating device, so that the polarization direction of the polarized light with extremely narrow frequency intervals in the incident linearly polarized light is rotated; the incident light passes through the alkali metal atomic air chamber to cause the dispersion curves of the left-handed component and the right-handed component of the incident linear polarized light to be split, the left-handed component and the right-handed component of the incident linear polarized light at the same frequency correspond to different refractive indexes, the polarization direction of the emergent light is determined by superposition of the left-handed component and the right-handed component of the incident linear polarized light, and the polarization direction of the emergent light rotates relative to the incident light. The invention distinguishes light with wavelength difference in tens pm or even smaller range, and can precisely control wavelength difference according to the need, and has simple structure and strong environmental adaptability.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to an ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and an implementation method thereof.
Background
The dichroic mirror has very important application in scientific research, and can transmit light wave with wavelength in a certain range by utilizing the special property of the dichroic mirror, but not reflect light meeting the wavelength requirement, separate light with different wave bands and select light with wavelength meeting the requirement. The dichroic mirrors can be generally divided into a long-pass dichroic mirror and a short-pass dichroic mirror, wherein the long-pass dichroic mirror and the short-pass dichroic mirror respectively distinguish transmission wave bands and reflection wave bands by initial wavelengths, and long-pass light which is larger than a certain wave band has high transmissivity so as to be selected, and the rest wave bands are reflected and transmitted to be cut off; short pass, i.e. light smaller than a certain wavelength band has a high transmissivity and is selected, the remaining wavelength bands are reflected and the propagation is cut off.
Currently, a dichroic mirror mostly adopts a coating technology to realize wavelength selection, and generally one surface of the dichroic mirror is coated with a dichroic film, and the other surface is coated with an antireflection film. This method can distinguish light having a large difference in wavelength, for example: tens of nanometers, but cannot separate light with wavelength intervals in the tens of picometers or less, thus making certain applications, for example: single-cavity double-frequency laser in precise measurement cannot be distinguished.
Disclosure of Invention
The invention provides an ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and a realization method thereof, which takes the principle that the rotation angle of the polarization state of light caused by Faraday anomalous dispersion is closely related to the frequency of light waves as a basic principle, and realizes the ultra-narrow band dichroic mirror, thereby distinguishing light with the wavelength difference in the range of tens of pm or even smaller, and simultaneously accurately controlling the wavelength difference according to the requirement, and has simple structure and extremely strong environmental adaptability, and is described in detail below:
an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect, comprising: the Faraday rotation module and the PBS light splitting module,
the Faraday rotation module consists of a 1/2 wave plate, an alkali metal atom air chamber, a permanent magnet for providing an axial magnetic field, an alkali metal atom air chamber heating device and a permanent magnet temperature control device;
the incident light passes through the 1/2 wave plate, the permanent magnet providing axial magnetic field and the center of the alkali metal atom air chamber; placing a power meter behind the polarization beam splitting module, and rotating a 1/2 wave plate to enable incident linearly polarized light to penetrate the center of the polarization beam splitting module to the greatest extent; setting the temperature of the alkali metal atom air chamber through an alkali metal atom air chamber heating device, so that the polarization direction of the polarized light with extremely narrow frequency intervals in the incident linearly polarized light is rotated;
the incident light passes through the alkali metal atomic air chamber to cause the dispersion curves of the left-handed component and the right-handed component of the incident linear polarized light to be split, the left-handed component and the right-handed component of the incident linear polarized light at the same frequency correspond to different refractive indexes, the polarization direction of the emergent light is determined by superposition of the left-handed component and the right-handed component of the incident linear polarized light, and the polarization direction of the emergent light rotates relative to the incident light.
The light with the wavelength interval of tens pm in the incident linearly polarized light accumulates the polarization rotation angle based on Faraday rotation effect, the polarization direction is changed into P polarization and S polarization after passing through the alkali metal atomic gas chamber, the final polarization rotation angle is different by odd times of 90 degrees, and the light splitting is realized through the PBS light splitting module.
A method of implementing an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effects, the method comprising:
setting a specific alkali metal atom air chamber temperature by an alkali metal atom air chamber heating device by taking a dual-wavelength Fabry-Perot laser with a frequency interval as a preset value as an incident light source, and enabling polarization directions of two extremely narrow frequency intervals in incident linearly polarized light to rotate respectively;
the two linearly polarized light frequencies in the incident light are different, so that the polarization rotation angles of the two linearly polarized light are different by odd times of 90 degrees, and the polarization beam splitting module is utilized for beam splitting;
respectively placing a gram Taylor prism with a extinction ratio of 1:100000 after the P polarization output and the S polarization output of the polarization beam splitter module, and measuring the polarized light power of the gram Taylor prism S after the P polarization output of the polarization beam splitter module; and the polarization splitting module S performs polarization output and then measures the polarized light power of the Glan taylor prism P.
Wherein the heating temperature of the alkali metal atom air chamber is 130-165 ℃, and the axial magnetic field provided by the permanent magnet is within the range of 6.5-8 kG.
Further, the working wavelength of the faraday rotation module only needs to correspond to an atomic transition spectral line, and the transition spectral line is in a ground state or in an excited state.
The technical scheme provided by the invention has the beneficial effects that:
1. the invention provides a method for distinguishing light with small interval (such as tens of pm) and even smaller range by utilizing different rotation angles based on the close correlation between the rotation of Faraday anomalous dispersion and the frequency of light polarization state;
2. the working wavelength of the invention only depends on atomic resonance transition spectral lines, and the ground state and the excited state can be both realized, and the invention is not limited to a special wave band;
3. the wavelength interval of the dichroic mirror can be set according to actual needs, and the dichroic mirror has a simple structure and extremely strong environmental adaptability.
Drawings
FIG. 1 is a diagram of an arrangement of ultra-narrow band dichroic mirrors based on Faraday anomalous dispersion effects;
fig. 2 is a flow chart of a method for implementing an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect.
In the drawings, the list of components represented by the various numbers is as follows:
1: a 1/2 wave plate; 2: a permanent magnet that provides an axial magnetic field;
3: a permanent magnet temperature control device; 4: an alkali metal atom gas cell;
5: an alkali metal atomic gas chamber heating device; 6: a Faraday rotation module;
7: and the PBS beam splitting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
An embodiment of the present invention provides an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect, referring to fig. 1 and 2, comprising: faraday rotation module 6, PBS spectroscopic module 7.
The Faraday rotation module 6 consists of a 1/2 wave plate 1, an alkali metal atom air chamber 4, a permanent magnet 2 for providing an axial magnetic field, an alkali metal atom air chamber heating device 5 and a permanent magnet temperature control device 3; the existence of an external magnetic field can cause the magnetic energy level of a working atom to generate Zeeman splitting, so that the left-handed component and the right-handed component of the incident linearly polarized light correspond to different resonance transition frequencies, the resonance transition frequency of the right-handed component is generally reduced, and the resonance transition frequency of the left-handed circularly polarized component is increased. The difference of the resonance transition frequencies of the left-handed component and the right-handed component can lead the absorption and dispersion curves of the atomic vapor in the alkali metal atomic gas chamber to be split, namely the absorption of the left-handed component and the right-handed component can generate larger difference, and the dispersion can also generate larger difference. The dispersion directly corresponds to the refractive index, and the difference of the dispersion of the left-handed component and the dispersion of the right-handed component causes the refractive index to be different when the left-handed component and the right-handed component propagate in the same atomic medium, so that the phase change of the same optical path of propagation is different, and after the left-handed component and the right-handed component propagate in the Faraday rotation module, the polarization state of linearly polarized light formed by superposition of the left-handed component and the right-handed component rotates compared with the polarization state of incident light, which is called resonance rotation.
It should be noted that the external conditions are as follows: the magnetic field intensity, the length of the alkali metal air chamber and the temperature of the alkali metal air chamber are the same, the resonance rotation effect is closely related to the frequency of incident light, and the closer the frequency of the incident light is to the atomic resonance transition frequency, the stronger the resonance rotation effect is, namely, two light beams with different frequencies are incident to the same Faraday rotation module, and the two light beams can obtain different polarization rotation angles. When light having a wavelength difference in the range of several tens pm or less is incident on the faraday rotation module, due to the above-described resonance rotation effect, by controlling the outside such as: the conditions of magnetic field intensity, alkali metal air chamber length, alkali metal air chamber temperature and the like enable the two to become P polarization and S polarization respectively after rotation, namely, the polarization angles are different by odd times of 90 degrees, and then the light in the corresponding polarization direction is selected through the PBS beam splitting module, so that the ultra-narrow band dichroic mirror beam splitting can be realized.
The optical rotation effect in the embodiment of the present invention occurs in the faraday rotation module 6, and external conditions can be changed, for example: the magnetic field intensity, the length of the alkali metal air chamber, the temperature of the alkali metal air chamber and the like change two light beams with arbitrary wavelength intervals into P polarization and S polarization, namely the polarization rotation angles are different by odd times of 90 degrees, so that the two polarized light beams realize dichroic mirror light splitting through the PBS light splitting module 7. Particularly for extremely small wavelength intervals, for example: light in the range of tens of pm or even smaller is distinguished.
The faraday rotation module 6 mainly functions to rotate the polarization direction of light when external conditions, such as: when the conditions such as the magnetic field intensity, the length of the alkali metal air chamber and the temperature of the alkali metal air chamber are determined, the resonance rotation effect is closely related to the frequency of the incident light, the rotation angles of the light with different frequencies are different, and finally, the light with the wavelength interval of tens of pm or less can be split by utilizing the PBS (PBS) beam splitting module 7 through the polarization direction difference. The Faraday rotator module 6 consists of a 1/2 wave plate 1, an alkali metal atom air chamber 4, a permanent magnet 2 for providing an axial magnetic field, an alkali metal atom air chamber heating device 5 and a permanent magnet temperature control device 3; the PBS beam splitting module 7 is a polarization beam splitting prism with a extinction ratio of 1:10000.
The 1/2 wave plate 1 is used for adjusting the polarization direction of incident ray polarized light; meanwhile, in order to ensure that the magnetic field can meet the requirement of the rotation angle of the polarization direction of incident light, the size of the alkali metal atom air chamber 4 should be as small as possible, so that the distance between the magnets is as small as possible, and the axial magnetic field strength can be kept uniform under the condition of being as large as possible. When the incident light passes through the alkali metal atom air chamber 4, the existence of the external magnetic field can cause the magnetic energy level of the working atom to generate Zeeman splitting, so that the dispersion curves of the left-hand component and the right-hand component of the incident linear polarized light are split, and the left-hand component and the right-hand component of the incident linear polarized light at the same frequency correspond to different refractive indexes, so that after the same path is propagated in the alkali metal atom air chamber 4, the phase change of the two components is different, and finally the polarization direction of the emergent light is determined by superposition of the left-hand component and the right-hand component of the incident linear polarized light, so that the polarization direction of the emergent light rotates relative to the incident light.
The faraday rotation module 6 in the embodiment of the invention sets the specific conditions of the length, the axial magnetic field intensity and the like of the alkali metal atom air chamber 4, namely the heating temperature, namely the atomic density and the like of the alkali metal atom air chamber 4, so that the light with the wavelength interval of tens of pm or smaller in the incident linear polarized light can accumulate the polarization rotation angle based on the faraday rotation effect, the polarization direction is changed into P polarization and S polarization after passing through the alkali metal atom air chamber 4, namely the final polarization rotation angle is different by odd times of 90 degrees, and the light splitting is realized through the PBS light splitting module 7. The faraday rotation module 6 may have an operating wavelength corresponding to only an atomic transition line, and the transition line may be a ground state or an excited state. For example: rubidium atom 5S 1/2 -5P 3/2 The transition can be used for light separation near 780nm wavelength, 5S 1/2 -5P 1/2 The transition can be used for light separation near 795nm wavelength, cs atom 6S 1/2 -6P 3/2 The transition can be used for light separation with 852nm wavelength, 6S 1/2 -6P 1/2 The transition can be used for light separation with 894nm wavelength, and Cs atom excited state 5P 3/2 -4D 5/2 The transition can be used for light separation of 1529nm wavelength, and the wavelength corresponding to the transition spectral line of other alkali metal atoms is within the protection scope of the embodiment of the invention.
The PBS spectroscopic module 7 is configured to separate two light beams rotating in the polarization direction in the faraday rotation module 6 according to the difference in the polarization direction, so that ultra-narrow band spectroscopic can be realized.
Example 1
The embodiment of the invention provides a good property of utilizing atomic resonance transition and obvious phenomenon, which takes Faraday rotation caused by splitting of working atomic magneton energy level caused by Zeeman effect as a basic principle and aims at realizing ultra-narrow band such as: the dichroic mirror functions by splitting incident linearly polarized light at a wavelength interval of several tens pm or less. Faraday rotation module 6 in the embodiment of the invention uses Cs atoms 6S 1/2 -6P 3/2 D 2 The line transition is illustrated as an example. The method mainly uses the Langber-beer law and Faraday optical rotation effect related theoretical model to generate magnetic fieldWhen the atomic energy level structure is split, the Zeeman splitting can be correspondingly divided into linearity or nonlinearity according to whether the external magnetic field strength is a weak field or a strong field. The atomic energy level is divided to cause different transition frequencies of left-handed and right-handed components of incident linearly polarized light, a dispersion curve is divided to cause different refractive indexes of the two components, so that phase shift is introduced, and finally, the polarization direction of the incident linearly polarized light is deflected, and when external conditions are the same, the polarization rotation angle is closely related to the frequency of the incident linearly polarized light, and according to the difference of the polarization rotation angles, ultra-narrow band, namely, light splitting with a wavelength interval of tens of pm or a smaller range can be realized.
Example 2
A method for implementing an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect, see fig. 2, the method comprising the steps of:
201: because the interval between two wavelengths in the incident linearly polarized light is very narrow and is tens of pm or more narrow, the embodiment of the invention uses the dual-wavelength Fabry-Perot laser with the frequency interval of 9.192GHz as an incident light source;
in practical application, if the two polarization rotations are changed into P light and S light through Faraday rotation, namely, the polarization rotation angles are different by 90 degrees and odd times, a larger magnetic field and a higher temperature are needed, so that the phase offset accumulation can meet the requirements of the two polarization rotation angles which are different by 90 degrees and odd times, and then the polarization is utilized for light splitting.
The Faraday rotation module 6 is arranged so that incident light can pass through the 1/2 wave plate 1, the permanent magnet 2 for providing axial magnetic field and the center of the alkali metal atom air chamber 4; the polarization beam splitting module 7 is arranged, the power meter is arranged behind the polarization beam splitting module 7, and the 1/2 wave plate 1 is rotated, so that incident linearly polarized light is transmitted through the center of the polarization beam splitting module 7 to the greatest extent; the specific alkali metal atom air chamber temperature is set through the alkali metal atom air chamber heating device 5, so that the polarization directions of two polarized lights with extremely narrow frequency intervals in the incident linear polarized lights are respectively rotated, and finally, the polarization rotation directions are different due to different accumulated phase offsets of the left-right rotation components of the two linearly polarized lights in different frequencies, so that the polarization rotation angles of the two frequency lights are different by odd times of 90 degrees. Thereby performing light splitting by using the polarization light splitting module.
The temperature of the permanent magnet needs to be controlled because the magnitude of the axial magnetic field is closely related to the temperature of the permanent magnet, and the heating temperature of the alkali metal atom air chamber in the embodiment of the invention needs to be 130-165 ℃, so that the influence of the heating of the alkali metal atom air chamber on the magnitude of the axial magnetic field provided by the permanent magnet is avoided; the permanent magnet 2 in the embodiment of the invention provides an axial magnetic field with a magnitude in the range of 6.5kG-8 kG.
202: after light is split by the polarization splitting module 7, respectively placing a gram Taylor prism with a extinction ratio of 1:100000 after P polarization output and S polarization output of the polarization splitting module 7, and measuring the polarization light power of the gram Taylor prism S after the P polarization output of the polarization splitting module 7; and after the polarization beam splitting module S outputs polarization, the polarization power of the Glan Taylor prism P is measured, so that the polarization beam splitting effect is tested.
In particular, the embodiment of the invention utilizes polarization to realize ultra-narrow-band dichroic mirrors based on Faraday rotation effect, and splits light with a wavelength interval of tens of pm or smaller. Meanwhile, the outside magnetic field is adjusted, the temperature of the alkali metal atom air chamber is controlled, and the polarization is utilized to carry out light splitting according to different wavelength interval requirements.
In summary, the embodiment of the invention uses the principle that the faraday anomalous dispersion causes the optical polarization rotation angle to be closely related to the optical wave frequency, and the faraday dual-frequency light with the Cs atom dual-wavelength interval of 9.192GHz is distinguished, that is, the light with the wavelength difference of tens of pm or less is distinguished, and meanwhile, the wavelength difference can be precisely controlled as required, and the device has a simple structure and extremely strong environmental adaptability. The method plays a positive role in the works of geometric precision measurement, cold atom physics, laser spectroscopy, time keeping time service and the like, the dual-wavelength Fabry-Perot laser with extremely narrow wavelength intervals is split by utilizing polarization rotation caused by Faraday rotation, related physical research can be carried out by utilizing light containing two frequencies and light with two separated frequencies at the same time, the laser frequency of the Faraday dual-frequency laser can be locked to a corresponding atomic transition spectral line, and the stability is greatly improved.
Those skilled in the art will appreciate that the drawings are schematic representations of only one preferred embodiment, and that the above-described embodiment numbers are merely for illustration purposes and do not represent advantages or disadvantages of the embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (5)
1. An ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect, comprising: the Faraday rotation module and the PBS light splitting module,
the Faraday rotation module consists of a 1/2 wave plate, an alkali metal atom air chamber, a permanent magnet for providing an axial magnetic field, an alkali metal atom air chamber heating device and a permanent magnet temperature control device;
the incident light passes through the 1/2 wave plate, the permanent magnet providing axial magnetic field and the center of the alkali metal atom air chamber; placing a power meter behind the polarization beam splitting module, and rotating a 1/2 wave plate to enable incident linearly polarized light to penetrate the center of the polarization beam splitting module to the greatest extent; setting the temperature of the alkali metal atom air chamber through an alkali metal atom air chamber heating device, so that the polarization direction of the polarized light with extremely narrow frequency intervals in the incident linearly polarized light is rotated;
the incident light passes through the alkali metal atomic air chamber to cause the dispersion curves of the left-handed component and the right-handed component of the incident linear polarized light to be split, the left-handed component and the right-handed component of the incident linear polarized light at the same frequency correspond to different refractive indexes, the polarization direction of the emergent light is determined by superposition of the left-handed component and the right-handed component of the incident linear polarized light, and the polarization direction of the emergent light rotates relative to the incident light.
2. The ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect according to claim 1, wherein light having a wavelength interval of several tens pm among incident linearly polarized light accumulates polarization rotation angle based on faraday optical rotation effect, the polarization direction becomes P-polarization and S-polarization after passing through the alkali metal atomic gas cell, and the final polarization rotation angle is different by an odd multiple of 90 °, and the light splitting is realized by the PBS spectroscopic module.
3. A method for implementing an ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect, the method comprising:
setting a specific alkali metal atom air chamber temperature by an alkali metal atom air chamber heating device by taking a dual-wavelength Fabry-Perot laser with a frequency interval as a preset value as an incident light source, and enabling polarization directions of two extremely narrow frequency intervals in incident linearly polarized light to rotate respectively;
the two linearly polarized light frequencies in the incident light are different, so that the polarization rotation angles of the two linearly polarized light are different by odd times of 90 degrees, and the polarization beam splitting module is utilized for beam splitting;
respectively placing a gram Taylor prism with a extinction ratio of 1:100000 after the P polarization output and the S polarization output of the polarization beam splitter module, and measuring the polarized light power of the gram Taylor prism S after the P polarization output of the polarization beam splitter module; and the polarization splitting module S performs polarization output and then measures the polarized light power of the Glan taylor prism P.
4. A method for realizing ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect according to claim 3, characterized in that said heating temperature of alkali metal atomic gas chamber is 130-165 ℃, and the magnitude of axial magnetic field provided by permanent magnet is in the range of 6.5-8 kG.
5. A method for realizing ultra-narrow band dichroic mirror based on faraday anomalous dispersion effect according to claim 3, characterized in that the operation wavelength of faraday rotation module only needs to correspond to atomic transition spectral line, the transition spectral line is in ground state or in excited state.
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| CN202310620671.7A CN116931287A (en) | 2023-05-29 | 2023-05-29 | Ultra-narrow band dichroic mirror based on Faraday anomalous dispersion effect and implementation method thereof |
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