CN216362198U - Miniaturized integrated probe based on hollow optical fiber atomic air chamber - Google Patents
Miniaturized integrated probe based on hollow optical fiber atomic air chamber Download PDFInfo
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- CN216362198U CN216362198U CN202220032108.9U CN202220032108U CN216362198U CN 216362198 U CN216362198 U CN 216362198U CN 202220032108 U CN202220032108 U CN 202220032108U CN 216362198 U CN216362198 U CN 216362198U
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Abstract
The utility model relates to the field of radio frequency measurement, in particular to a miniaturized integrated probe based on a hollow optical fiber atom air chamber, which comprises a high-efficiency transmission optical fiber, a polarization beam splitting optical fiber grating, a semi-reflecting and semi-transmitting optical fiber grating, a hollow optical fiber containing an atom air chamber and a total reflection optical fiber grating; the utility model has the following technical effects: the integration level and portability of the sensing probe of the quantum radio frequency measurement system are improved by integrating the polarization beam splitting fiber grating, the semi-reflecting and semi-transmitting fiber grating, the hollow fiber containing the atomic gas chamber and the total reflection fiber grating on the common fiber, the same-direction input of the detection light and the coupling light is realized while the effective excitation of the rydberg atoms is ensured, the overall size of the sensing probe is reduced, and the laser utilization rate is improved.
Description
Technical Field
The utility model relates to the field of radio frequency measurement, in particular to a miniaturized integrated probe based on a hollow optical fiber atomic gas chamber.
Background
The quantum radio frequency measurement technology based on the rydberg atoms has the remarkable advantages of high sensitivity, high accuracy, ultra wide band, small size of a sensing probe and the like, and is a research hotspot in the field of current domestic and foreign quantum detection. The atomic gas chamber is a core key component of a quantum radio frequency measurement system based on the rydberg atoms, and the preparation of the rydberg atoms generally uses two-photon excitation of probe light and coupling light which are transmitted oppositely to reduce Doppler frequency shift quantity and improve the absorption rate of atoms to laser, so that the excitation efficiency of the rydberg atoms is improved. In the measuring system, the requirement of opposite transmission of the probe light and the coupling light is not beneficial to the integration of the whole optical path to a certain extent, compared with the same-direction transmission optical path, the length of the optical axis direction of the probe is increased by about 1 time, and the laser utilization rate is not high.
According to different application requirements, the atomic gas chamber is usually packaged into various shapes by using transparent materials such as quartz glass, sapphire and the like, and is subjected to vacuum treatment or is filled with different buffer gases, a certain amount of alkali metal atoms are filled in the atomic gas chamber, and the integral volume of the gas chamber is more than a few cubic centimeters. In order to reduce the size of the probe, improve the resolution of a measuring system and improve the portability of the measuring system, researchers bond and fix an atomic gas chamber, an optical fiber collimating lens, a polarization maintaining optical fiber and the like which are packaged by transparent materials, so that the probe can be moved, but the problems of large integral size, incapability of bending the bonded and fixed position, low integration degree and the like of the probe also exist; the alkali metal atoms are filled into the hollow optical fiber to realize the miniaturization of the air chamber, but the detection light and the coupling light still transmit oppositely, the size of the probe still has a further reduced space, and the utilization rate of the laser is not high enough, so that the practicability of the measuring system is limited.
SUMMERY OF THE UTILITY MODEL
Therefore, the small-sized integrated probe based on the hollow optical fiber atomic gas chamber is necessary to solve the problems that the existing atomic gas chamber is large in size, simple in integration and not high in laser utilization rate, and cannot meet practical requirements.
The technical scheme adopted by the utility model is as follows: a miniaturized integrated probe based on a hollow optical fiber atom air chamber is used for quantum radio frequency measurement based on Reedberg atoms and comprises a high-efficiency transmission optical fiber 1, a polarization beam splitting optical fiber grating 2, a semi-reflecting and semi-transmitting optical fiber grating 3, a hollow optical fiber 4 containing an atom air chamber and a total reflection optical fiber grating 5;
the high-efficiency transmission optical fiber 1 is used for high-efficiency transmission of detection light and coupling input and output of the polarization beam splitting fiber grating 2;
the polarization beam splitting fiber grating 2 is connected with the high-efficiency transmission fiber 1 and is divided into a coupling light polarization beam splitting fiber grating 21 and a detection light polarization beam splitting fiber grating 22, the coupling light polarization beam splitting fiber grating 21 is used for generating coupling light in a specific polarization state, the detection light polarization beam splitting fiber grating 22 is used for generating detection light in a specific polarization state, and the detection light and the coupling light in the specific polarization state can interact with alkali metal atoms in the hollow fiber 4 containing an atom gas chamber;
the semi-reflective and semi-transparent fiber grating 3 is connected with the polarization beam splitting fiber grating 2 and is divided into a coupling light semi-reflective and semi-transparent fiber grating 31 and a detection light semi-reflective and semi-transparent fiber grating 32, the coupling light semi-reflective and semi-transparent fiber grating 31 is used for realizing the partial reflection/transmission of coupling light, increasing the effective optical path of the coupling light in the hollow fiber 4 comprising an atom air chamber and enhancing the interaction of the coupling light and alkali metal atoms, the detection light semi-reflective and semi-transparent fiber grating 32 is used for realizing the partial reflection/transmission of the detection light, increasing the effective optical path of the detection light in the hollow atom air chamber and enhancing the interaction of the detection light and the alkali metal atoms;
the hollow optical fiber 4 containing the atomic gas chamber is connected with the semi-reflecting and semi-permeable fiber grating 3, the atomic gas chamber 41 is processed on the common optical fiber, a certain amount of alkali metal atoms 42 are filled in the atomic gas chamber, and the rydberg atoms are prepared by absorbing probe light and coupling light, so that the measurement of radio frequency field parameters is realized;
the total reflection fiber bragg grating 5 is connected with the hollow fiber 4 containing the atomic gas chamber and is divided into a coupling light total reflection fiber bragg grating 51 and a detection light total reflection fiber bragg grating 52, the coupling light total reflection fiber bragg grating 51 is used for realizing total reflection of coupling light, the coupling light is reflected to the hollow fiber 4 containing the atomic gas chamber, the utilization rate of the coupling light is improved, the detection light total reflection fiber bragg grating 52 is used for realizing total reflection of detection light, the detection light is reflected to the hollow fiber atomic gas chamber, and the utilization rate of the detection light is improved;
the detection light and the coupling light are input from the high-efficiency transmission optical fiber 1, pass through the polarization beam splitting optical fiber grating 2, the semi-reflecting and semi-transparent optical fiber grating 3, the hollow optical fiber 4 containing an atom air chamber and the total reflection optical fiber grating 5, then the original light path returns, and is output from the high-efficiency transmission optical fiber 1, the laser utilization efficiency is improved through an optical cavity formed by the total reflection optical fiber grating 5 and the semi-reflecting and semi-transparent optical fiber grating 3, the interaction between the laser and the atoms is enhanced, and the excitation efficiency of alkali metal atoms in the air chamber is effectively improved.
Further, the alkali metal atom is a cesium atom or a rubidium atom.
Furthermore, the polarization beam splitting fiber grating 2, the semi-reflecting and semi-transmitting fiber grating 3, the hollow fiber 4 containing the atomic gas chamber and the total reflection fiber grating 5 can be integrated on a common fiber.
Furthermore, the polarization beam splitting fiber grating 2, the semi-reflecting and semi-transmitting fiber grating 3 and the total reflection fiber grating 5 can be directly prepared on a common fiber by adopting a direct writing method, a phase mask method, a focused ion beam writing method and the like.
The utility model has the following technical effects: by integrating the polarization beam splitting fiber grating 2, the semi-reflecting and semi-transparent fiber grating 3, the hollow fiber 4 containing the atomic gas chamber and the total reflection fiber grating 5 on a common fiber, the integration and portability of the sensing probe of the quantum radio frequency measurement system are improved, the same-direction input of detection light and coupling light is realized while the effective excitation of the rydberg atoms is ensured, the overall size of the sensing probe is reduced, and the laser utilization rate is improved.
Drawings
FIG. 1 is a schematic structural diagram of a miniaturized integrated probe based on a hollow fiber atomic gas chamber according to the present invention;
the reference numbers illustrate:
1. a high efficiency transmission optical fiber; 2. a polarization beam splitting fiber grating; 21. coupling light polarization beam splitting fiber bragg grating; 22. detecting light polarization beam splitting fiber bragg grating; 3. a semi-reflecting and semi-transmitting fiber grating; 31. coupling light semi-reflecting and semi-transmitting fiber gratings; 32. the detection light semi-reflecting and semi-transmitting fiber grating; 4. a hollow optical fiber including an atomic gas chamber; 41. an atomic gas cell; 42. an alkali metal atom; 5. a total reflection fiber grating; 51. detecting light total reflection fiber grating; 52. and coupling the optical total reflection fiber grating.
Detailed Description
The utility model will be further explained with reference to the drawings.
As shown in figure 1, the utility model provides a miniaturized integrated probe based on a hollow optical fiber atom air chamber, which is used for quantum radio frequency measurement based on rydberg atoms, and comprises a high-efficiency transmission optical fiber 1, a polarization beam splitting optical fiber grating 2, a semi-reflecting and semi-permeable optical fiber grating 3, a hollow optical fiber 4 containing an atom air chamber and a total reflection optical fiber grating 5;
the detection light is input from the high-efficiency transmission optical fiber 1, is transmitted to the hollow optical fiber 4 comprising an atomic air chamber through the coupling light polarization beam splitting optical fiber grating 21, the detection light polarization beam splitting optical fiber grating 22, the coupling light semi-reflection and semi-transmission optical fiber grating 31 and the detection light semi-reflection and semi-transmission optical fiber grating 32, is totally reflected under the action of the detection light total reflection optical fiber grating 51 through the atomic air chamber 41, is reflected to the atomic air chamber 41 in a 50 percent way under the action of the detection light semi-reflection and semi-transmission optical fiber grating 32, and is returned to the high-efficiency transmission optical fiber 1 through the detection light semi-reflection and semi-transmission optical fiber grating 32, the coupling light semi-reflection and semi-transmission optical fiber grating 31, the detection light polarization beam splitting optical fiber grating 22 and the coupling light polarization beam splitting optical fiber grating 21;
the coupled light is input from the high-efficiency transmission fiber 1, is transmitted to the hollow fiber 4 containing an atomic air chamber through the coupled light polarization beam splitting fiber grating 21, the detection light polarization beam splitting fiber grating 22, the coupled light semi-reflection and semi-transmission fiber grating 31 and the detection light semi-reflection and semi-transmission fiber grating 32, is totally reflected under the action of the coupled light total reflection fiber grating 52 through the atomic air chamber 41 and the detection light total reflection fiber grating 51 filled with alkali metal atoms 42, is reversely transmitted through the detection light total reflection fiber grating 51, the atomic air chamber 41 and the detection light semi-reflection and semi-transmission fiber grating 32, and under the action of the coupled light semi-reflection and semi-transmission fiber grating 31, 50% of the coupled light is reflected back to the atomic air chamber 41 through the detection light semi-reflection and semi-transmission fiber grating 32, and 50% of the coupled light returns to the high-efficiency transmission fiber 1 through the detection light polarization beam splitting fiber grating 22 and the coupled light polarization beam splitting fiber grating 21.
The polarization beam splitting fiber grating 2 realizes the consistent polarization directions of the detection light and the coupling light which penetrate through the atomic gas chamber; the coupled light polarization beam splitting fiber grating 21 and the coupled light semi-reflection and semi-transmission fiber grating 31 have no modulation function on the detection light; the detection light polarization beam splitting fiber grating 22, the detection light semi-reflection and semi-transmission fiber 32 and the detection light total reflection fiber grating 51 have no modulation function on the coupling light; the detection light and the coupling light are efficiently transmitted to the optical fiber 1, and the rest parts except the optical fiber grating part have no modulation function on the detection light and the coupling light.
The miniaturized integrated probe based on the hollow optical fiber atom gas chamber is one of core components in a quantum radio frequency measurement system based on the rydberg atoms. A Reidberg atom is an atom with one electron in a highly excited state with a large number of major quanta (n > 1). The utility model realizes the resonance energy level transition of atoms from a ground state to an intermediate state by detecting light and realizes the resonance energy level transition from the intermediate state to a Reedberg state by coupling light. The acquisition of the radio frequency field information is realized by measuring the detection spectrum returned by the high-efficiency transmission optical fiber 1.
Claims (6)
1. A miniaturized integrated probe based on a hollow optical fiber atom air chamber is used for quantum radio frequency measurement based on a rydberg atom, and is characterized in that: the device comprises an efficient transmission fiber (1), a polarization beam splitting fiber grating (2), a semi-reflecting and semi-transmitting fiber grating (3), a hollow fiber (4) containing an atom air chamber and a total reflection fiber grating (5);
the high-efficiency transmission optical fiber (1) is used for high-efficiency transmission of detection light and coupling input and output of the polarization beam splitting fiber grating (2);
the polarization beam splitting fiber grating (2) is connected with the high-efficiency transmission fiber (1) and is divided into a coupling light polarization beam splitting fiber grating (21) and a detection light polarization beam splitting fiber grating (22), the coupling light polarization beam splitting fiber grating (21) is used for generating coupling light in a specific polarization state, the detection light polarization beam splitting fiber grating (22) is used for generating detection light in the specific polarization state, and the detection light and the coupling light in the specific polarization state can interact with alkali metal atoms in the hollow fiber (4) comprising an atom gas chamber;
the coupling light semi-reflecting and semi-transmitting fiber grating (31) is used for realizing partial reflection/transmission of coupling light, increasing the effective optical path of the coupling light in a hollow fiber (4) comprising an atom air chamber and enhancing the interaction between the coupling light and alkali metal atoms, and the detection light semi-reflecting and semi-transmitting fiber grating (32) is used for realizing partial reflection/transmission of detection light, increasing the effective optical path of the detection light in the hollow atom air chamber and enhancing the interaction between the detection light and the alkali metal atoms;
the hollow optical fiber (4) comprising the atomic gas chamber is connected with the semi-reflecting and semi-transmitting fiber grating (3), the atomic gas chamber (41) is processed on a common optical fiber, a certain amount of alkali metal atoms (42) are filled in the atomic gas chamber, and the rydberg atoms are prepared by absorbing probe light and coupling light, so that the measurement of radio frequency field parameters is realized;
the total reflection fiber bragg grating (5) is connected with a hollow fiber (4) comprising an atomic air chamber and is divided into a coupling light total reflection fiber bragg grating (51) and a detection light total reflection fiber bragg grating (52), the coupling light total reflection fiber bragg grating (51) is used for realizing total reflection of coupling light and reflecting the coupling light to the hollow fiber (4) comprising the atomic air chamber, so that the utilization rate of the coupling light is improved, the detection light total reflection fiber bragg grating (52) is used for realizing total reflection of detection light and reflecting the detection light to the hollow fiber atomic air chamber, and the utilization rate of the detection light is improved;
the detection light and the coupling light are input from the high-efficiency transmission optical fiber (1), and are output from the high-efficiency transmission optical fiber (1) after passing through the polarization beam splitting optical fiber grating (2), the semi-reflecting and semi-transmitting optical fiber grating (3), the hollow optical fiber (4) containing an atom air chamber and the total reflection optical fiber grating (5), an original light path returns, and the laser is improved in laser utilization efficiency through an optical cavity formed by the total reflection optical fiber grating (5) and the semi-reflecting and semi-transmitting optical fiber grating (3), and interaction of the laser and the atoms is enhanced to effectively improve the excitation efficiency of alkali metal atoms in the air chamber.
2. A miniaturized integrated probe based on a hollow fiber atom gas cell of claim 1 for use in reed-castle atom based quantum radio frequency measurements, characterized in that: the alkali metal atoms are cesium atoms or rubidium atoms.
3. A miniaturized integrated probe based on a hollow fiber atom gas cell of claim 1 for use in reed-castle atom based quantum radio frequency measurements, characterized in that: the polarization beam splitting fiber grating (2), the semi-reflecting and semi-transmitting fiber grating (3), the hollow fiber (4) containing the atomic gas chamber and the total reflection fiber grating (5) can be integrated on a common fiber.
4. A miniaturized integrated probe based on a hollow fiber atom gas cell of claim 3 for use in reed-castle atom based quantum radio frequency measurements, characterized in that: the polarization beam splitting fiber grating (2), the semi-reflecting and semi-transmitting fiber grating (3) and the total reflection fiber grating (5) are all directly prepared on a common optical fiber by adopting a direct writing method.
5. A miniaturized integrated probe based on a hollow fiber atom gas cell of claim 3 for use in reed-castle atom based quantum radio frequency measurements, characterized in that: the polarization beam splitting fiber grating (2), the semi-reflecting and semi-transmitting fiber grating (3) and the total reflection fiber grating (5) are all directly prepared on a common fiber by adopting a phase mask method.
6. A miniaturized integrated probe based on a hollow fiber atom gas cell of claim 3 for use in reed-castle atom based quantum radio frequency measurements, characterized in that: the polarization beam splitting fiber grating (2), the semi-reflecting and semi-transmitting fiber grating (3) and the total reflection fiber grating (5) are directly prepared on a common fiber by adopting a focused ion beam writing method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220032108.9U CN216362198U (en) | 2022-01-07 | 2022-01-07 | Miniaturized integrated probe based on hollow optical fiber atomic air chamber |
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| CN202220032108.9U CN216362198U (en) | 2022-01-07 | 2022-01-07 | Miniaturized integrated probe based on hollow optical fiber atomic air chamber |
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| CN216362198U true CN216362198U (en) | 2022-04-22 |
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| CN202220032108.9U Active CN216362198U (en) | 2022-01-07 | 2022-01-07 | Miniaturized integrated probe based on hollow optical fiber atomic air chamber |
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