CN108539569B - Ultra-narrow band atomic filter and method for realizing filtering - Google Patents
Ultra-narrow band atomic filter and method for realizing filtering Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
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- 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
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
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Abstract
The invention discloses an ultra-narrow band atomic filter and a method for realizing filtering, and the technical scheme is that an atomic high excited state transition spectral line with weaker oscillator intensity is transferred to a transition spectral line with lower excited state of an atom with stronger oscillator intensity by utilizing the speed transfer effect of an atom, and the Faraday effect is combined, so that when probe light passes through the atomic filter, magneto-optical rotation is generated, and a target optical signal corresponding to pump laser is output. The pump light is frequency stabilized by using a saturated absorption spectrum, and the magnitude of a magnetic field can be strictly controlled by changing the magnitude of current. The rubidium bubbles are arranged in the magnetic shielding box to eliminate the influence of the geomagnetic field. Compared with the traditional atomic filter, the atomic filter has narrower passband bandwidth and better filtering effect.
Description
Technical Field
The invention belongs to the technical field of photoelectrons, and relates to an ultra-narrow band Faraday anomalous dispersion atomic optical filter realized by utilizing the speed transfer effect and the Faraday effect of atoms and a method for realizing optical filtering.
Background
In laser communication, light is attenuated by dispersion, absorption, and other factors during transmission, and a signal is weak when the light reaches a receiving system. The function of the optical filter is to extract a weak narrow-band optical signal from a strong broadband background light. The optical filter is used for transmitting optical signals, so that background light noise can be effectively inhibited, the signal to noise ratio of signals of a receiving system is improved, and the detection sensitivity of the receiving system can be improved.
The faraday anomalous dispersion atomic filter (FADOF) is the most studied and widely used atomic filter at present, and has the advantages that: narrow bandwidth, high transmission, large field angle and high out-of-band noise rejection ratio. The principle of FADOF was proposed by Ohman as early as 1956, which utilizes the Faraday optical rotation property at the atomic vapor resonance transition frequency to achieve optical filtering. Subsequently, not only in theoretical terms, a large number of studies have been carried out in experiments on different atoms. 780nm is transition line wavelength of rubidium atom D2, and corresponding FADOFs are also researched a lot, but most FADOFs have bandwidth in GHz level.
The 420nm atomic transition and the 780nm transition have a common ground state energy level, an atomic high excited state transition spectral line with weak oscillator strength is transferred to a transition spectral line of an atomic low excited state with strong oscillator strength by utilizing the speed transfer effect of atoms, the ultra-narrow band FADOF can be realized, the bandwidth is about dozens of MHz to one hundred MHz, and the report on the aspect is not available so far.
Disclosure of Invention
In view of the above, the present invention provides an ultra-narrow band faraday anomalous dispersion atomic filter implemented by using the speed transfer effect and faraday effect of atoms, the passband bandwidth of the atomic filter is from tens MHz to one hundred MHz, which is narrower than most existing atomic filters, and the atomic filter can be applied to the fields of novel optical clocks, high precision laser spectrum frequency stabilization, etc.
In order to solve the above-mentioned technical problems, the present invention is thus solved.
An ultra-narrow band atomic filter comprises a rubidium atomic filter and a pumping light generating component;
the rubidium atom optical filter comprises a first laser for generating 780nm laser, and a first half wave plate, a first polarizer, a first transflective mirror, a first rubidium bubble, a second transflective mirror and a second polarizer which are sequentially arranged on an emergent light path of the 780nm laser; the polarization directions of the first polarizer and the second polarizer are perpendicular and orthogonal to each other; the first transflective mirror and the second transflective mirror are highly transparent to 780nm laser and highly reflective to 420nm laser; a coil is wound on the bubble wall of the first rubidium bubble and used for generating an axial static magnetic field consistent with the 780nm laser direction;
the pump light generating assembly generates pump light with the wavelength of 420nm, the pump light is reflected into the first rubidium bubble through the second transflective mirror, the pump light interacts with rubidium atoms together with detection light with the wavelength of 780nm generated by the first laser, and the detection light is combined with the Faraday effect, so that when passing through the rubidium atom optical filter, magneto-optical rotation occurs, and after passing through the second polarizer, the detection light generates a target light signal corresponding to the pump light.
Preferably, the pump light generated by the pump light generation assembly is frequency stabilized by a saturation absorption spectrum.
Preferably, the pump light generation assembly includes a second laser, and 420nm laser output by the second laser is divided into two laser beams by a second half-wave plate and a polarization beam splitter prism, wherein one of the two laser beams is used as the pump light, and the other laser beam is used for frequency stabilization of a saturated absorption spectrum;
laser used for frequency stabilization of a saturated absorption spectrum is divided into frequency stabilization pump light and frequency stabilization detection light through a first high-reflection mirror; the frequency stabilization pump light and the frequency stabilization probe light enter the second rubidium bubble and interact with rubidium atoms; the frequency-stabilized detection light passing through the second rubidium bubble is detected by a second photoelectric detector, and a detection signal enters a servo feedback circuit system for processing and is used for stabilizing the working wavelength of the second laser, so that the 420nm laser frequency is locked on a saturated absorption peak;
and after passing through the quarter-wave plate, the 420nm laser serving as the pump light is irradiated into the first rubidium bubble by the second transflective mirror.
Preferably, in the pump light generation assembly, for the frequency stabilization pump light and the frequency stabilization probe light divided by the first high-reflection mirror, the frequency stabilization probe light directly enters the second rubidium bubble, and the frequency stabilization pump light enters the second rubidium bubble from the opposite side of the frequency stabilization probe light after being continuously reflected by the second high-reflection mirror, the third high-reflection mirror and the fourth high-reflection mirror.
Preferably, the first rubidium bubble is loaded in a first magnetic shielding box and is used for shielding the influence of an external magnetic field on the experiment.
Preferably, the first rubidium bubble and the second rubidium bubble are both cylindrical glass bubbles, and two end faces of the first rubidium bubble and the second rubidium bubble are smooth; the glass bulb is filled with rubidium atoms and buffer gas.
Preferably, a first detector is arranged on the light-emitting side of the second polarizer, and the signal-to-noise ratio of the filtering signal detected by the first detector is optimized by optimizing the light intensity of the 420nm pumping light and the 780nm detecting light.
Preferably, the second rubidium bubble is wrapped with a heating element for controlling the working temperature of the rubidium bubble; a second rubidium bulb containing a heating element is further disposed within a second magnetic shield box.
Preferably, the magnetic field size of the axial static magnetic field is in the range of 0 to 10G.
Preferably, the first polarizer and the second polarizer are both Glan Taylor prisms; the first laser and the second laser are both interference filter lasers.
The invention also provides a method for realizing light filtering by using any one of the ultra-narrow band atomic filters, which comprises the following steps:
the second laser generates 420nm laser, and the 420nm laser is divided into two beams of laser by the second half-wave plate and the polarization beam splitter prism, wherein one beam of the 420nm laser is used as pump light, and the other beam of the 420nm laser is used for frequency stabilization of a saturated absorption spectrum;
laser used for frequency stabilization of a saturated absorption spectrum is divided into frequency stabilization pump light and frequency stabilization detection light through a first high-reflection mirror; the frequency stabilization pump light and the frequency stabilization probe light enter the second rubidium bubble and interact with rubidium atoms; the frequency-stabilized detection light passing through the second rubidium bubble is detected by a second photoelectric detector, and a detection signal enters a servo feedback circuit system for processing and is used for stabilizing the working wavelength of the second laser, so that the 420nm laser frequency is locked on a saturated absorption peak;
780nm laser generated by a first laser is used as detection light, and enters the first rubidium bubble after passing through a first half-wave plate, a first polarizer and a first transflective mirror; meanwhile, the 420nm pump light after frequency stabilization passes through a quarter-wave plate and a second transflective mirror, and then is irradiated into a first rubidium bubble to interact with rubidium atoms together with 780nm probe light; through Faraday effect, when the detection light passes through the atomic filter, magneto-optical rotation occurs, and after the detection light passes through the second polarizer, a target light signal corresponding to the pump laser is generated.
Electrifying the coil to generate an axial static magnetic field, and accurately controlling the size of the magnetic field by changing the size of the current so that the magnetic field is uniform and the direction of the magnetic field is consistent with the direction of the detection light;
optimizing the size of the static magnetic field to ensure that the signal light transmits as much as possible, the background light is filtered, and the first photoelectric detector arranged on the light-emitting side of the second polarizer detects the filtering signal;
the light intensity of the 420nm pump light and the 780nm detection light is optimized, so that the signal-to-noise ratio of the filtering signal detected by the first detector is optimal.
Compared with the prior art, the invention has the beneficial effects that:
the technical scheme of the invention utilizes the speed transfer effect of atoms to transfer the 420nm transition spectral line with weaker oscillator strength to the 780nm transition spectral line with stronger oscillator strength, and combines the Faraday effect of the atoms to filter the optical signals at the resonance frequency through but not the optical signals at resonance, thereby realizing the Faraday anomalous dispersion atomic filter with ultra-narrow bandwidth. Compared with the traditional atomic filter, the scheme combines the speed transfer effect and the Faraday effect of atoms, the passband bandwidth is far narrower than that of the traditional atomic filter, and the bandwidth is about dozens of MHz to one hundred MHz. In the specific implementation process of the scheme, 420nm laser is used as pump light, the frequency is stabilized on a saturation absorption peak, and 780nm laser is used as probe light. The rubidium bubbles are placed in the magnetic shielding box, so that the influence of the geomagnetic field on experimental results is eliminated.
Drawings
FIG. 1 is a schematic diagram of a 780nm ultra-narrow bandwidth atomic optical filter using rubidium atoms in an embodiment of the present invention;
wherein, 1 — a first laser; 2-a first half-wave plate; 3-a first polarizer; 4-a first transflective mirror; 5-a first magnetic shield case; 6, a coil; 7-first rubidium bubbles; 8-a second transflective mirror; 9-a second polarizer; 10 — a first photodetector; 11-a quarter wave plate; 12 — a second laser; 13-a second half-wave plate; 14-a polarization beam splitter prism; 15-first high-reflection mirror; 16-a second high-reflection mirror; 17-third high reflection mirror; 18-fourth high-reflection mirror; 19-second rubidium bubbles; 20 — a second photodetector.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The principle of the invention is as follows: the laser corresponding to the atomic transition wavelength with weaker oscillator strength is used as pumping light, the laser corresponding to the atomic transition wavelength with stronger oscillator strength is used as detection light, the laser interacts with atoms, the atomic high excited state transition spectral line with weaker oscillator strength is transferred to the transition spectral line of the atomic low excited state with stronger oscillator strength through a speed transfer effect, and the Faraday effect is combined, so that when the detection light passes through the atomic optical filter, magneto-optical rotation is generated, and a target optical signal corresponding to the pumping laser is output.
Based on the principle, the ultra-narrow-band Faraday anomalous dispersion atomic filter provided by the invention comprises two major parts, wherein one part is a filter part, and the other part is a pump light generation part.
The filter portion comprises a first laser 1, a first half-wave plate 2, a first polarizer 3 and a second polarizer 9; a first rubidium bubble 7 is placed between the first transflective mirror 4 and the second transflective mirror 8 and then between the first polarizer 3 and the second polarizer 9. The first transflective lens 4 and the second transflective lens 8 are highly transparent to 780nm laser and highly reflective to 420nm laser; a coil 6 is wound on the bulb wall of the first rubidium bulb 7 and used for generating an axial static magnetic field; a first rubidium bubble 7 is loaded in the magnetic shielding box 5 and used for shielding the influence of an external magnetic field on an experiment; the polarization directions of the first polarizer 3 and the second polarizer 9 are perpendicular and orthogonal to each other.
In addition, the ultra-narrow band atomic filter further comprises a second laser 12 for generating 420nm pump laser light, a second half-wave plate 13, a polarization splitting prism 14, a second rubidium bubble 19, a first high-reflection mirror 15, a second high-reflection mirror 16, a third high-reflection mirror 17, a fourth high-reflection mirror 18, a second photoelectric detector 20, a servo feedback circuit system and a quarter-wave plate 11. The 420nm laser output by the second laser 12 is divided into two laser beams by a second half-wave plate 13 and a polarization beam splitter prism 14, wherein one laser beam is used as pump light, and the other laser beam is used for frequency stabilization of a saturated absorption spectrum; specifically, the method comprises the following steps:
the laser used for frequency stabilization of the saturated absorption spectrum is divided into two beams of laser with different light intensities by the high reflecting mirror 15, wherein the beam with stronger light intensity is used as frequency stabilization pump light, and the beam with weaker light intensity is used as frequency stabilization probe light; the frequency stabilization pump light and the frequency stabilization probe light interact with rubidium atoms in the second rubidium bubble 19; the frequency-stabilized detection light is detected by the second photoelectric detector 20, the 420nm laser frequency is locked on the saturated absorption spectrum through the servo feedback circuit system, and the servo feedback circuit system stabilizes the working wavelength of the second laser by controlling the second laser, so that frequency stabilization is realized;
and the other beam of 420nm laser, as a pumping light, passes through the quarter-wave plate 11, is hit into the first rubidium bubble 7 by the second transflective mirror 8, and is transmitted into the first rubidium bubble together with the 780nm laser generated by the first laser 1 to interact with rubidium atoms. 780nm laser light generated by the first laser 1 is used as detection light; the direction of the axial static magnetic field is consistent with the direction of the detection light, the detection light is enabled to rotate by the Faraday effect when passing through the atomic filter, the detection light is received by the first photoelectric detector 10 arranged on the emergent light path of the second polarizer 9 after passing through the second polarizer 9, and a target light signal corresponding to the pump laser is detected.
The invention also provides a method for realizing light filtering by using the ultra-narrow bandwidth atomic light filter, which comprises the following steps:
a second laser 12, a second half-wave plate 13, a polarization beam splitter prism 14, a high-reflection mirror 15, a second rubidium bulb 19, a high-reflection mirror 16, a high-reflection mirror 17, a high-reflection mirror 18 and a second photoelectric detector 20 which are used for generating 420nm laser are sequentially arranged in a 420nm saturated absorption spectrum frequency stabilizing light path; wherein, the second rubidium bubble 19 is arranged in a magnetic shielding box (not marked in the figure) for shielding the influence of the earth magnetic field on the experimental result; the 420nm laser generated by the second laser 12 passes through the high reflection mirror 15 and is divided into two beams of laser with different light intensities, wherein the reflected light is used as pump light, and the transmitted light is used as probe light; the pump light and the probe light interact with rubidium atoms in the second rubidium bubble 19; the detection light is detected by the second photoelectric detector 20, and the 420nm laser frequency is locked on the saturated absorption spectrum through the servo feedback circuit system;
780nm laser generated by the first laser 1 is used as detection light, and enters the first rubidium bubble 7 after passing through the first half-wave plate 2, the first polarizer 3 and the first transflective mirror 4; the frequency-stabilized 420nm laser is used as pump light, passes through a quarter-wave plate 11 and a second transflective mirror 8, is irradiated into a first rubidium bubble 7, and interacts with rubidium atoms together with the 780nm probe light; through Faraday effect, when passing through the atomic filter, the detection light rotates due to magneto-optical effect, and after passing through the second polarizer 9, the detection light is received by the first photoelectric detector 10 to detect a target optical signal corresponding to the pump laser.
Energizing the coil 6 to generate an axial static magnetic field, and accurately controlling the magnitude of the magnetic field by changing the magnitude of the current, wherein the required magnetic field is uniform and the direction of the magnetic field is consistent with the direction of the detection light;
by optimizing the size of the magnetic field, the deflection angle of the signal light reaches 90 degrees as much as possible, the background light is filtered by the mutually perpendicular polarizers because of no deflection, and the first photoelectric detector 10 detects the filtering signal;
the light intensities of the 420nm pump light and the 780nm probe light are changed so that the signal-to-noise ratio of the filtered signal detected by the first detector 10 is optimized.
Specifically, in one embodiment of the present invention, as shown in fig. 1, an axial static magnetic field is generated by energizing a coil 6 wound around the wall of a first rubidium bubble 7, and the magnitude of the magnetic field can be precisely controlled by changing the magnitude of the current.
The second rubidium bubble 19 in the 420nm saturated absorption frequency stabilization is also arranged in a magnetic shielding box (not shown in the figure) and is used for shielding the influence caused by the earth magnetic field; the second rubidium bulb 19 is wrapped with a heating element (not shown), which can control the operating temperature of the second rubidium bulb 19 to operate under optimal conditions.
The direction of the axial static magnetic field is consistent with the direction of 780nm detection light, and 780nm transmission signals are generated at the position of a velocity transfer spectrum under the action of 420nm pump light through the Faraday effect. The signal-to-noise ratio of the filtering signal detected by the first detector 10 is optimized by adjusting the magnitude of the static magnetic field, the intensity of the pumping light and the intensity of the detecting light.
In the embodiment of the invention, the method for filtering 780nm signal light by adopting the ultra-narrow band atomic filter specifically comprises the following steps:
the coil 6 is electrified with current, the size of a magnetic field is controlled by changing the size of the current, and the range of the magnetic field is 0-10G; the whole first rubidium bubble 7 device is arranged in the magnetic shielding box 5, so that the influence of a geomagnetic field is eliminated;
the 420nm pump laser locks the output frequency of the laser on one absorption peak by using a saturated absorption spectrum frequency stabilization method; the 420nm laser is used as pump light, the laser power is required to be as large as possible, and the light emitting power of the 420nm laser can reach 20mW or even higher;
780nm laser is used as detection light, the power does not need to be very high, and the power is generally in the magnitude of hundreds of microwatts. The pump light and the detection light interact with rubidium atoms in the rubidium bubbles, and the power of the detection light and the pump light is optimized respectively, so that the signal-to-noise ratio of the target signal light after passing through the second polarizer is optimal.
The method for realizing light filtering by adopting the light filter comprises the following steps:
the second laser 12 generates 420nm laser, and the 420nm laser is divided into two laser beams by the second half-wave plate 13 and the polarization beam splitter prism 14, wherein one laser beam is used as pump light, and the other laser beam is used for frequency stabilization of a saturated absorption spectrum;
laser for frequency stabilization of a saturated absorption spectrum is divided into frequency-stabilized pump light and frequency-stabilized probe light through a first high-reflection mirror 15; the frequency stabilization pump light and the frequency stabilization probe light enter the second rubidium bubble 19 and interact with rubidium atoms; the frequency-stabilized detection light passing through the second rubidium bulb 19 is detected by a second photoelectric detector 20, and a detection signal enters a servo feedback circuit system for processing, so as to stabilize the working wavelength of the second laser 12, and thus the 420nm laser frequency is locked on a saturation absorption peak;
780nm laser generated by the first laser 1 is used as detection light, and enters the first rubidium bubble 7 after passing through the first half-wave plate 2, the first polarizer 3 and the first transflective mirror 4; meanwhile, the 420nm pump light after frequency stabilization passes through the quarter-wave plate 11 and the second transflective mirror 8, and then is emitted into the first rubidium bubble 7, and interacts with rubidium atoms together with 780nm probe light; through the Faraday effect, when the detection light passes through the atomic filter, the rotation of the magneto-optical occurs, and after the detection light passes through the second polarizer 9, a target optical signal corresponding to the pump laser is generated.
Energizing the coil 6 to generate an axial static magnetic field, and accurately controlling the magnitude of the magnetic field by changing the magnitude of the current so as to ensure that the magnetic field is uniform and the direction of the magnetic field is consistent with the direction of the detection light;
optimizing the size of the static magnetic field to enable the signal light to transmit as far as possible, filtering out background light, and detecting a filtering signal by a first photoelectric detector 10 arranged on the light-emitting side of a second polarizer 9;
the light intensities of the 420nm pump light and the 780nm probe light are optimized so that the signal-to-noise ratio of the filtered signal detected by the first detector 10 is optimized.
The ultra-narrow band atomic filter embodiments described above are merely illustrative of the principles of the present invention and are not intended to limit the scope of the present invention. Modifications and variations of the above-described embodiments may be made by those skilled in the art without departing from the technical principles and spirit of the present invention, and such modifications and variations should also be considered as within the scope of the present invention. The scope of the invention is to be determined by the following claims.
Claims (8)
1. An ultra-narrow band atomic filter is characterized by comprising a rubidium atomic filter and a pumping light generating component;
the rubidium atom optical filter comprises a first laser (1) for generating 780nm laser, and a first half wave plate (2), a first polarizer (3), a first transflective mirror (4), a first rubidium bubble (7), a second transflective mirror (8) and a second polarizer (9) which are sequentially arranged on an outgoing light path of the 780nm laser; the polarization directions of the first polarizer (3) and the second polarizer (9) are perpendicular and orthogonal to each other; the first transflective mirror (4) and the second transflective mirror (8) are highly transparent to 780nm laser and highly reflective to 420nm laser; a coil (6) is wound on the bulb wall of the first rubidium bulb (7) and is used for generating an axial static magnetic field consistent with the 780nm laser direction;
the pump light generating assembly generates pump light with the wavelength of 420nm, the pump light is reflected into the first rubidium bubble (7) through the second transflective mirror (8), the pump light and detection light with the wavelength of 780nm generated by the first laser (1) interact with rubidium atoms, and the Faraday effect is combined, so that when the detection light passes through the rubidium atom optical filter, magneto-optical rotation occurs, and after the detection light passes through the second polarizer (9), a target light signal corresponding to the pump light is generated.
2. The ultra-narrow band atomic filter according to claim 1, wherein in the pump light generating assembly, for the frequency stabilized pump light and the frequency stabilized probe light divided by the first high reflecting mirror (15), the frequency stabilized probe light directly enters the second rubidium bubble (19), and the frequency stabilized pump light enters the second rubidium bubble (19) from the opposite side of the frequency stabilized probe light after successive reflections by the second high reflecting mirror (16), the third high reflecting mirror (17) and the fourth high reflecting mirror (18).
3. An ultra-narrow band atomic filter according to claim 1, characterised in that said first rubidium bubble (7) is housed in a first magnetic shielding box (5) for shielding the effect of the external magnetic field on the experiment.
4. The ultra-narrow band atomic filter according to claim 2, wherein the first rubidium bubble (7) and the second rubidium bubble (19) are both cylindrical glass bubbles, and both end faces are flat; the glass bulb is filled with rubidium atoms and buffer gas.
5. The ultra-narrow band atomic filter according to claim 1, wherein a first detector (10) is installed at the light exit side of the second polarizer (9), and the signal-to-noise ratio of the filter signal detected by the first detector (10) is optimized by optimizing the light intensity of the 420nm pump light and the 780nm probe light.
6. The ultra-narrow band atomic filter according to claim 5, wherein the magnitude of the magnetic field of the axial static magnetic field is in the range of 0 to 10G.
7. The ultra-narrow band atomic filter according to claim 1, characterized in that the first polarizer (3) and the second polarizer (9) are both glan-taylor prisms; the first laser (1) and the second laser (12) are both interference filter lasers.
8. A method of filtering light using the ultra-narrow bandwidth atomic filter of any of claims 1 to 7, comprising the steps of:
the second laser (12) generates 420nm laser, and the laser is divided into two beams of laser by a second half-wave plate (13) and a polarization beam splitter prism (14), wherein one beam of the 420nm laser is used as pump light, and the other beam of the 420nm laser is used for frequency stabilization of a saturated absorption spectrum;
laser used for frequency stabilization of a saturated absorption spectrum is divided into frequency-stabilized pump light and frequency-stabilized probe light through a first high-reflection mirror (15); the frequency stabilization pump light and the frequency stabilization probe light enter the second rubidium bubble (19) and interact with rubidium atoms; the frequency-stabilized detection light passing through the second rubidium bubble (19) is detected by a second photoelectric detector (20), and a detection signal enters a servo feedback circuit system for processing and is used for stabilizing the working wavelength of the second laser (12), so that the frequency of the pump light is locked on a saturation absorption peak;
780nm laser generated by a first laser (1) is used as detection light, and enters a first rubidium bubble (7) after passing through a first half-wave plate (2), a first polarizer (3) and a first transflective mirror (4); meanwhile, the pump light after frequency stabilization passes through a quarter-wave plate (11) and a second transflective mirror (8) and then is hit into a first rubidium bubble (7) to interact with rubidium atoms together with probe light of 780 nm; through Faraday effect, when the detection light passes through the atomic filter, magneto-optical rotation is generated, and after the detection light passes through a second polarizer (9), a target light signal corresponding to the pump laser is generated;
energizing the coil (6) to generate an axial static magnetic field, and accurately controlling the magnitude of the magnetic field by changing the magnitude of the current so that the magnetic field is uniform and the direction of the magnetic field is consistent with the direction of the detection light;
optimizing the size of a static magnetic field to ensure that signal light transmits as far as possible, filtering background light, and detecting a filtering signal by a first photoelectric detector (10) arranged on the light emergent side of a second polarizer (9);
the light intensities of the pump light and the 780nm detection light are optimized, so that the signal-to-noise ratio of the filtering signal detected by the first detector (10) is optimized.
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| CN201810258209.6A CN108539569B (en) | 2018-03-27 | 2018-03-27 | Ultra-narrow band atomic filter and method for realizing filtering |
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| CN108539569B true CN108539569B (en) | 2021-04-13 |
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| CN110018631A (en) * | 2019-04-10 | 2019-07-16 | 温州激光与光电子协同创新中心 | The Cs atom microwave frequency standard and its implementation detected using faraday's laser pumping |
| CN110133878B (en) * | 2019-04-30 | 2022-06-10 | 陕西师范大学 | Ultra-narrow-band Faraday normal dispersion atomic filter based on cavity electromagnetic induction transparency and filtering method |
| CN111404030B (en) * | 2020-04-01 | 2021-02-19 | 浙江大学 | Novel Faraday anomalous dispersion Rb atom filter and method |
| CN112485732B (en) * | 2020-11-13 | 2021-07-02 | 山西大学 | Magnetometer calibration method and device based on rubidium atomic magnetic resonance spectrum |
| CN112600058B (en) * | 2020-12-07 | 2023-06-09 | 中国科学院上海光学精密机械研究所 | Rb-based 87 Modulation transfer spectrum frequency stabilization light path structure |
| CN113097854B (en) * | 2021-04-02 | 2022-09-30 | 温州激光与光电子协同创新中心 | Faraday active optical clock-based dark cavity laser and implementation method thereof |
| CN114284862A (en) * | 2021-11-24 | 2022-04-05 | 温州激光与光电子协同创新中心 | Faraday laser based on modulation transfer spectrum frequency stabilization and implementation method thereof |
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| CN103825193A (en) * | 2014-03-07 | 2014-05-28 | 北京大学 | Excited state Faraday anomalous dispersion atomic filtering method for ultra narrow band of communication waveband |
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