CN101425804B - Coherent arrangement imprisoned atomic clock - Google Patents
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- CN101425804B CN101425804B CN 200810225078 CN200810225078A CN101425804B CN 101425804 B CN101425804 B CN 101425804B CN 200810225078 CN200810225078 CN 200810225078 CN 200810225078 A CN200810225078 A CN 200810225078A CN 101425804 B CN101425804 B CN 101425804B
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
- G04F5/145—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks using Coherent Population Trapping
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Abstract
The invention provides a coherent population trapping atomic clock which comprises a circuit unit of an atomic clock and a physic unit of an atomic clock, wherein the circuit unit of the atomic clock is used for starting, running and closing the atomic clock, and the physic unit of the atomic clock comprises a laser, an atomic air chamber and a signal receiving processor. Polarizing plates are additionally arranged between the laser and the atomic chamber. The laser outputs round polarizing light by the polarizing plates and a one-fourth wave plate. The light strength can be continuously adjusted by rotating the middle set of polarizing plates so as to adjust and optimize a detecting signal of a CPT atomic clock. The signal receiving processor is connected with the circuit unit of the atomic clock to form the closed loop of the atomic clock. The coherent population trapping atomic clock can increase the signal-noise ratio of the detecting signal and has low power consumption and high stability.
Description
Technical field
The present invention relates to the atomic clock field, be specifically related to a kind of coherent population trapping atomic clock physical location, be applicable to keep time, the field such as time service, range finding, navigation, location, call duration time are synchronous.
Background technology
Coherent population trapping (CPT, Coherent Population Trapping) atomic clock is a kind of miniaturization atomic clock, can satisfy the requirement of location, navigation and the numerous application of accurate calendar scheduling, simultaneously because volume is little lightweight, cheap, power consumption is little, thereby has greatly expanded the application of atomic clock, realizing passive coherent population trapping atomic clock, i.e. the miniaturization of atomic clock and the stability of raising atomic clock, the advantage that the accuracy aspect has self.
The principle of coherent population trapping atomic clock is, the laser field of two kinds of different frequencies and the effect of Three-level Atom system, if the difference on the frequency of these two laser equals interval between two ground state hyperfine structures of atom, and satisfy the two-photon resonance condition, then two of ground state sub-energy levels just coherently are coupled together, atom on the sub-energy level no longer absorbs photon from two laser fields, can not be excited to excitation state, and namely atom is trapped on two sub-energy levels of ground state.When wherein a branch of light frequency scanned near atomic resonance frequency, the intensity in transmission of light in atomic medium was rendered as the electromagnetically induced transparent signal; Because the electromagnetically induced transparent signal can be used as after treatment error signal local oscillation signal is locked on the hyperfine sub-level spacing of atomic ground state, thereby realize the atomic clock loop; Coherent population trapping in the alkali metal atom is for realizing that atomic clock provides a kind of effective method.
Passive-type coherent layout Trapping of Atoms clock is easy to carry out microminiaturization in conjunction with microelectric technique owing to do not need microwave cavity, is made into chip-shaped atomic clock; The coherent layout Trapping of Atoms clock of prior art adds a certain proportion of buffer gas, changes by the pressure of regulating buffer gas, has reduced phenomenon and detectable signal live width that Doppler widens; For realizing the approach of high precision small atomic clock, prior art is utilized servo circuit to be provided with automatic control circuit and is controlled various conditions, other prior art [D.K.Serkland, G.M.Peake.The Miniature Atomic Clock-Pre-Production Results, IEEE, 2007,1327.] temperature of temperature-adjusting circuit is controlled at 80.0 ℃, like this in the atomic clock use procedure of passive-type Coherent Population Trapping Trapping of Atoms, the volume of atomic clock is reduced, current most chip-scale atomic clock all is the passive-type atomic clock that adopts Coherent Population Trapping imprison principle.
Yet, in the temperature control of the atomic clock of this passive-type Coherent Population Trapping imprison principle, need to begin in the startup of atomic clock will preheating, temperature reaches 80.0 ℃, and the frequency signal of error ability stable output when 0.01 ℃ scope is in this process, many energy are consumed, temperature has drift behind the long-play in addition, and the frequency signal of output is no longer accurate, that is to say that temperature floats the restriction that phenomenon becomes chip-scale atomic clock output frequency signal stability.
Up to now, the realization of CPT atomic clock, comprise initiatively or passive, the light beam form or contain buffer gas closed cell form, comprised that also cold atom medium, hot atom add buffer gas, index is not very high, the stability that is mainly manifested in the atomic frequency signal is all on the low side, and power consumption is large, and its frequency drift is 10
-9/ day scope.
In a word, need at present the urgent technical problem that solves of those skilled in the art to be exactly: how to provide that a kind of cost low-power consumption is little, stability is high, increase the CPT atomic clock of detectable signal signal to noise ratio.
Summary of the invention
Technical problem to be solved by this invention provides and a kind ofly can increase the detectable signal signal to noise ratio, the coherent arrangement imprisoned atomic clock that power consumption is little and stability is high.
In order to address the above problem, the invention discloses a kind of coherent arrangement imprisoned atomic clock, it comprises:
The atomic clock circuit unit, be used for controlling described atomic clock startup, move and close, this atomic clock circuit unit comprises: laser driving and lock-in circuit, microwave generator and lock-in circuit, biasing tree, the atomic air chamber temperature-adjusting circuit, the atomic frequency signal output apparatus;
The atomic clock physical location comprises laser, atomic air chamber and signal receiving processor; Described laser is by polarizer and quarter-wave plate output circularly polarized light, and this circularly polarized light is via the atomic air chamber that comprises atomic gas, to signal receiving processor; Described polarizer is one or more pieces; The laser facula that its shape, size and described laser are exported is corresponding and be convenient to fix; Described atomic air chamber comprises at least one speculum, and described circularly polarized light reflects rear to signal receiving processor at least one times via described speculum; Wherein, the output signal of described laser driving and lock-in circuit and described microwave generator and lock-in circuit is passed through the coupling of biasing tree, drives and the adjusting laser, exports required laser signal; This laser signal obtains Coherent Population Trapping number imprison information by atomic air chamber with the atomic gas effect, and the arriving signal receiving processor;
This signal receiving processor connects described microwave generator and lock-in circuit, drive and lock-in circuit with described laser, composed atom clock closed circuit, described two lock-in circuits receive respectively described signal receiving processor to signal, the generation feedback error signal also automatically adjusts, described atomic frequency signal output apparatus is connected in the output of described microwave generator and lock-in circuit, output atomic clock standard signal.
Preferably, described polarizer comprises two groups, and first group of polarizer is positioned over the output of described laser, is used for selecting single linearly polarized light; Second group of polarizer with described quarter-wave plate combination, is used for the linearly polarized light of described laser output is converted into circularly polarized light, and inputs described atomic air chamber between described first group of polarizer and described quarter-wave plate.
Preferably, also comprise the attenuator that enters the laser signal light intensity of described atomic air chamber for adjusting between described first group of polarizer and the described second group of polarizer, this attenuator is polarizer or light-balancing filter.
Preferably, described atomic air chamber is the glass air chamber, and this glass air chamber is cylindrical shape, and bottom surface diameter and the bus length of described glass air chamber are more than or equal to 4mm.
Preferably, described atomic air chamber comprises at least one speculum, and described circularly polarized light reflects rear to described signal receiving processor at least one times via described speculum.
Preferably, described signal receiving processor is the photodetection diode, and this photodetection diode receives the area of signal more than or equal to 1mm
2
Preferably, described laser is semiconductor laser, and the output wavelength of this laser is 795nm.
Preferably, described atomic air chamber also includes buffer gas; Described buffer gas is neon and argon gas, and the pressure ratio scope of this neon and argon gas is 1.3: 1 to 1: 1.2.
Preferably, described atomic clock also comprises, the atomic air chamber temperature-adjusting circuit, and this atomic air chamber temperature-adjusting circuit is used for regulating the temperature of atomic air chamber.
Preferably, the atomic gas that comprises of described atomic air chamber is the rubidium atomic gas.
Compared with prior art, the present invention has the following advantages:
At first, the present invention is by using the combination of polarizer and quarter-wave plate to obtain preferably circularly polarized light, this circularly polarized light is through comprising the atomic air chamber of atomic gas, by increasing length and the sectional area of atomic air chamber, and in atomic air chamber, increase speculum, so that described circularly polarized light and rubidium atom are done the time spent, its operating distance lengthens, thereby can obtain the more detectable signal of high s/n ratio, and it is temperature required to reduce air chamber; Make the output frequency signal of CPT atomic clock more stable, accuracy is higher.
Moreover, between laser and atomic air chamber, increase polarizer, by one group of polarizer in the middle of rotating can be continuous the adjusting light intensity, and then regulate and optimize the detectable signal of CPT atomic clock, to improve the stability of atomic clock.
Description of drawings
Fig. 1 is the device schematic diagram of a kind of coherent population trapping atomic clock of the present invention;
Fig. 2 is the device schematic diagram of another kind of coherent population trapping atomic clock of the present invention;
Fig. 3 is a kind of coherent population trapping atomic clock physical location structural representation of the present invention;
Fig. 4 is another kind of coherent population trapping atomic clock physical location structural representation of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The core idea of the embodiment of the invention is, obtain the circularly polarized light that light intensity is fit to by the combination of using polarizer and quarter-wave plate, this circularly polarized light is through comprising the atomic air chamber of atomic gas, this atomic air chamber utilizes the Multi reflection principle of speculum to increase and surveys light at the light path of atomic air chamber, described circularly polarized light and rubidium atom operating distance are increased, thereby can obtain the more detectable signal of high s/n ratio, and it is temperature required to reduce air chamber; The output frequency signal of CPT atomic clock is more stable, and accuracy is higher; Can be as the time reference of gps satellite locating terminal, high precision computation machine, precise navigation system etc., also can be used for the aspects such as communication network, automatic control system be synchronous.
With reference to Fig. 1, show the device schematic diagram of a kind of coherent population trapping atomic clock of the present invention, described coherent arrangement imprisoned atomic clock comprises:
Atomic clock circuit unit 100, be used for controlling described atomic clock startup, move and close, atomic clock circuit unit 100 comprises: laser driving and lock-in circuit 102, microwave generator and lock-in circuit 101, biasing tree 103, atomic frequency signal output apparatus 105;
Atomic clock physical location 104, it comprises laser, atomic air chamber and signal receiving processor; Described laser is by polarizer and quarter-wave plate output circularly polarized light, and this circularly polarized light is via the atomic air chamber that comprises atomic gas and buffer gas, to signal receiving processor; Described polarizer is one or more pieces; The laser facula of its shape, size and the output of described laser is corresponding;
Wherein, the output signal of described laser driving and lock-in circuit 102 and described microwave generator and lock-in circuit 101 by 103 couplings of biasing tree, drives and the adjusting laser, exports required laser signal; This laser signal obtains Coherent Population Trapping number imprison information arriving signal receiving processor by atomic air chamber with the atomic gas effect, and the signal of described acquisition Coherent Population Trapping number imprison information is received and be converted to the signal of telecommunication by signal receiving processor;
This signal receiving processor connects described microwave generator and lock-in circuit 101, drive and lock-in circuit 102 with described laser, form described atomic clock closed circuit, described two lock-in circuits receive respectively the given signal of described signal receiving processor, the generation feedback error signal also automatically adjusts, described atomic frequency signal output apparatus 105 is connected in the output of described microwave generator and lock-in circuit 101, the atomic clock standard signal of output 5M or 10M.
The course of work of described microwave generator and lock-in circuit 101 is specially: at first by frequency signal v of local oscillator output of this microwave generator and lock-in circuit 101, this frequency is near the 5S of the atomic gas rubidium atom of atomic clock
1/2(F=2) → 5S
1/2(F=3) the center frequency signal v of transition spectral line
0, and by atomic clock physical location 104, obtain Coherent Population Trapping number imprison spectral line information, by the signal receiving processor receiving optical signals, and be converted to signal of telecommunication v
1, to microwave generator and lock-in circuit 101, this microwave generator and lock-in circuit 101 can be automatically with local oscillator output frequency signal v and core frequency signal v
0Difference be transformed to error signal, this error signal plays frequency discriminator; When local oscillator output frequency signal v changed, the automatic regulating frequency signal of this microwave generator and lock-in circuit v made frequency signal v ≈ v
0, export the frequency signal that various external equipment need via atomic clock signal output circuit 105.
In the specific implementation process, this signal receiving processor can be the photodetection diode, and the reception signal area of this photodetection diode is more than or equal to 1mm
2
The structure that shows another CPT atomic clock by Fig. 2, also comprise atomic air chamber temperature-adjusting circuit 106 at this CPT atomic clock circuit, the temperature that this atomic air chamber temperature-adjusting circuit 106 is used for regulating atomic air chamber, the circuit subelement of independent control variations in temperature in the atomic clock circuit unit, in the temperature control of the atomic clock of this passive-type Coherent Population Trapping Trapping of Atoms frequency signal, need to begin in the startup of atomic clock will preheating, and temperature reaches the required temperature of corresponding pressure and then frequency signal that can stable output.
Be illustrated in figure 3 as a kind of coherent population trapping atomic clock physical location structural representation of the present invention, be connected in the CPT atomic clock closed circuit, can be used as a preferred embodiment of the present invention, this atomic clock physical location comprises laser 10, atomic air chamber 17 and signal receiving processor 18; Described laser is by polarizer 12 and quarter-wave plate 16 output circularly polarized lights, and this circularly polarized light is via the atomic air chamber 17 that comprises atomic gas and buffer gas, to signal receiving processor 18.
Wherein, described laser 10 connecting lasers and lock-in circuit lock control circuit, output by the biasing tree 103 of the laser 10 connecting circuit unit of laser stent 11 supporting, this biasing tree 103 drives and regulates wavelength and the modulation signal of laser 10 outputs, laser 10 adopts the device that operation wavelength conforms to the atomic gas spectral line of atom CPT atomic clock under the room temperature, to reduce the power loss of temperature control;
The polarizer that is positioned over the output of laser 10 comprises two groups:
First group of polarizer 12 is connected in the output of laser, is used for selecting single linearly polarized light;
Second group of polarizer 14 with described quarter-wave plate 15 combinations, is used for the linearly polarized light of described laser output is converted into circularly polarized light 19, and inputs described atomic air chamber 17 between first group of polarizer 12 and quarter-wave plate 15.
In the specific implementation process, can also be used for regulating the attenuator 13 of laser Output of laser light intensity between described first group of polarizer 12 and the described second group of polarizer 14, described attenuator 13 can be polarizer or light-balancing filter, like this by rotating the adjusting light intensity that middle one group of attenuator 13 can be continuous, and then the detectable signal of adjusting and optimization CPT atomic clock, to improve the stability of atomic clock.
A kind of preferred implementation is that described atomic air chamber 17 is the glass air chamber, is cylinder type, as shown in Figure 3, bottom surface diameter and the bus length of atomic air chamber 17 are more than or equal to 4mm, if when the bottom surface of atomic air chamber 17 is rectangle, then the minor face of this rectangle is grown up in 4mm.
In addition, also comprise at least one speculum 16 at Fig. 3 Atom air chamber 17, described circularly polarized light 19 reflexes to signal receiving processor 18 at least one times via described speculum 16, so that described circularly polarized light 19 is done the time spent with the rubidium atomic gas, its operating distance lengthens, thereby can obtain the more detectable signal of high s/n ratio, and it is temperature required to reduce air chamber; Make the output frequency signal of CPT atomic clock more stable, accuracy is higher.In the present invention, described speculum adopts the Preparation of silver mirror of chemical reaction, and this silver mirror is plated in the outer surface of atomic air chamber, can adopt in addition other vacuum coating or pulse laser etc. to prepare silver mirror, also can adopt the deielectric-coating speculum.
Widen the appearance of phenomenon and reduce CPT signal live width in order to reduce CPT atomic clock Doppler spectral line, in atomic air chamber, mix two kinds of inactive gases as buffer gas; Wherein, this buffer gas can for, Ar gas and N
2Gas, CH
4Gas and N
2Gas in order better to reduce fluorescence phenomenon, can select Ar gas and Ne gas as buffer gas in addition.
Atomic clock of the present invention adopts nature rubidium atom vapor as operation material, the following description of the different parameters of the atomic air chamber of atomic clock: the bus of atomic air chamber long (mm), temperature range of choice by atomic air chamber number of times, CPT atomic clock temperature-adjusting circuit of buffer gas ratio in buffer gas total pressure (Torr), the atomic air chamber in the bottom surface diameter (mm) of atomic air chamber, the gas volume (mL) in the atomic air chamber, the atomic air chamber, laser beam (℃), shown in following table one:
Table one
| Bus long (mm) | Bottom surface diameter (mm) | Gas volume (ml) | The Ar:Ne ratio | Ar gas, Ne gas total pressure (Torr) | Order of reflection | Temperature range (℃) |
| 8 | 8 | 0.4 | 1:1.2 | 40 | 0 | 25-35 |
| 6 | 6 | 0.17 | 1:1.2 | 50 | 0 | 35-45 |
| 6 | 6 | 0.17 | 1:1.2 | 50 | 1 | 25-35 |
| 4 | 4 | 0.05 | 1:1.2 | 60 | 0 | 40-50 |
| 4 | 4 | 0.05 | 1:1.2 | 60 | 2 | 25-35 |
| 3 | 4 | 0.04 | 1:1.2 | 70 | 1 | 35-55 |
Above-mentioned Small-sized C PT atomic clock can according to different conditions, selected temperature-adjusting circuit and not need all can obtain under the temperature-adjusting circuit normal CPT atomic clock signal.Described laser signal at effective light path of atomic air chamber more than or equal to 8mm, described atomic clock does not need temperature-adjusting circuit, in the present embodiment, the rubidium atomic air chamber is by regulating buffer gas ratio and pressure so that temperature is floated minimum, carry out under can room temperature or the error of temperature just passable within 20 degree scopes, this apparatus structure makes circuit structure simple, more convenient in the use, and reduced the consumption of power, and can accurately regulate laser intensity and output frequency, the stability of output frequency signal is higher.
In the structure of CPT atomic clock, this atomic clock physical location can also use the structural representation such as Fig. 4; Among this Fig. 4, described laser is semiconductor laser, and preferred laser is the VCSEL laser, the linearly polarized light of two vertical direction of these laser 10 outputs, and described linear polarization light wavelength is 795nm.Described atomic air chamber 17 includes buffer gas Ar gas and Ne gas, and the pressure ratio scope of this neon and argon gas is that 1.3:1 is to 1:1.2; What adopt in addition is that the rubidium atomic gas is as sample gas.
The bottom surface diameter of this atomic air chamber 17 and the bus appearance of atomic air chamber 17 etc. are 8mm, and 17 gas volume 0.7ml in the atomic air chamber, laser beam can be even number time or odd number by the atomic air chamber number of times; Solid line represents the light path that laser signal 19 reality are walked among Fig. 4, and dotted line represents to adjust incident angle and speculum 16 areas make laser signal 20 process Multi reflection in atomic air chamber, and the laser signal of the output output of laser 10 is identical.
In the apparatus structure of the atomic clock physical location of Fig. 4, described laser signal 19 fully with the effects of rubidium atom, the frequency drift that the CPT atomic clock is exported is approximately 1*10
-10/ day, and this device do not need temperature-adjusting circuit, circuit structure is simple, reduce power consumption.
The following general introduction of the advantage of CPT atomic clock of the present invention:
1: adopt and regulate buffer gas ratio and pressure drop low temperature sensitiveness, can save temperature-controlling system, reduce power consumption, reduced circuit complexity, thus simplify the apparatus structure of CPT atomic clock,
2: former air chamber gas volume less and need to heat to 80 the degree or more than, 0.7 milliliter of gas volume of the present invention can be directly at working and room temperature.
3: the present invention uses polarizer to obtain single linearly polarized light, thereby can obtain the more detectable signal of high s/n ratio, can also directly regulate the laser intensity that enters air chamber by the rotatory polarization sheet in addition.
4: the effective light path of the rear modulated circularly polarized light process atomic air chamber of laser output is more than or equal to 8mm among the present invention, the rubidium atom effect of laser signal and sufficient amount obtains the more CPT signal of high s/n ratio, atomic clock output frequency signal accuracy is higher, and stability is better.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.Used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a coherent arrangement imprisoned atomic clock is characterized in that, comprising:
The atomic clock circuit unit, be used for controlling described atomic clock startup, move and close, this atomic clock circuit unit comprises: laser driving and lock-in circuit, microwave generator and lock-in circuit, biasing tree, the atomic air chamber temperature-adjusting circuit, the atomic frequency signal output apparatus;
The atomic clock physical location comprises laser, atomic air chamber and signal receiving processor; Described laser is by polarizer and quarter-wave plate output circularly polarized light, and this circularly polarized light is via the atomic air chamber that comprises atomic gas, to signal receiving processor; Described polarizer is one or more pieces; The laser facula that its shape, size and described laser are exported is corresponding and be convenient to fix; Described atomic air chamber comprises at least one speculum, and described circularly polarized light reflects rear to signal receiving processor at least one times via described speculum;
Wherein, the output signal of described laser driving and lock-in circuit and described microwave generator and lock-in circuit is passed through the coupling of biasing tree, drives and the adjusting laser, exports required laser signal; This laser signal obtains Coherent Population Trapping number imprison information by atomic air chamber with the atomic gas effect, and the arriving signal receiving processor;
This signal receiving processor connects described microwave generator and lock-in circuit, drive and lock-in circuit with described laser, composed atom clock closed circuit, described two lock-in circuits receive respectively described signal receiving processor to signal, the generation feedback error signal also automatically adjusts, described atomic frequency signal output apparatus is connected in the output of described microwave generator and lock-in circuit, output atomic clock standard signal.
2. atomic clock as claimed in claim 1 is characterized in that, described polarizer comprises two groups,
First group of polarizer is positioned over the output of described laser, is used for selecting single linearly polarized light;
Second group of polarizer with described quarter-wave plate combination, is used for the linearly polarized light of described laser output is converted into circularly polarized light, and inputs described atomic air chamber between described first group of polarizer and described quarter-wave plate.
3. atomic clock as claimed in claim 2 is characterized in that, also comprises the attenuator that enters the laser signal light intensity of described atomic air chamber for adjusting between described first group of polarizer and the described second group of polarizer, and this attenuator is polarizer or light-balancing filter.
4. atomic clock as claimed in claim 1 is characterized in that, described atomic air chamber is the glass air chamber, and this glass air chamber is cylindrical shape, and bottom surface diameter and the bus length of described glass air chamber are more than or equal to 4mm.
5. atomic clock as claimed in claim 1 is characterized in that, described signal receiving processor is the photodetection diode, and this photodetection diode receives the area of signal more than or equal to 1mm
2
6. atomic clock as claimed in claim 1 is characterized in that, described laser is semiconductor laser, and the output wavelength of this laser is 795nm.
7. atomic clock as claimed in claim 1 is characterized in that, described atomic air chamber also includes buffer gas; Described buffer gas is neon and argon gas, and the pressure ratio scope of this neon and argon gas is 1.3: 1 to 1: 1.2.
8. atomic clock as claimed in claim 1 is characterized in that, described atomic clock also comprises, the atomic air chamber temperature-adjusting circuit, and this atomic air chamber temperature-adjusting circuit is used for regulating the temperature of atomic air chamber.
9. atomic clock as claimed in claim 1 is characterized in that, the atomic gas that described atomic air chamber comprises is the rubidium atomic gas.
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| CN 200810225078 CN101425804B (en) | 2008-10-28 | 2008-10-28 | Coherent arrangement imprisoned atomic clock |
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| CN101425804B true CN101425804B (en) | 2013-03-13 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2928725B1 (en) | 2008-03-12 | 2010-04-09 | Centre Nat Rech Scient | COLD ATOMIC INTERFEROMETRIC SENSOR |
| CN102063054B (en) * | 2011-02-22 | 2012-09-05 | 合肥威师智能电子电器厂 | CPT (Coherent Population Trapping) atomic clock |
| CN102075187B (en) * | 2011-02-22 | 2013-03-13 | 合肥威师智能电子电器厂 | Cpt atomic clock servo circuit |
| US9134450B2 (en) | 2013-01-07 | 2015-09-15 | Muquans | Cold atom gravity gradiometer |
| JP2015070575A (en) * | 2013-09-30 | 2015-04-13 | セイコーエプソン株式会社 | Atomic oscillator, atomic oscillator frequency adjusting method, electronic equipment, and mobile body |
| CN103684450B (en) * | 2013-12-24 | 2017-02-01 | 北京大学 | Method for outputting standard frequency of coherent population beat-frequency atomic clock |
| CN104518795B (en) * | 2014-12-30 | 2017-10-31 | 武汉中元通信股份有限公司 | Atomic clock module for the Big Dipper/gps time signal communication network time service equipment |
| CN105467821B (en) * | 2015-12-01 | 2018-04-06 | 北京无线电计量测试研究所 | A kind of physical system of Atomic Clocks Based on Coherent Population Trapping |
| CN107014555B (en) * | 2017-03-15 | 2019-04-05 | 兰州空间技术物理研究所 | A kind of measuring device of atomic air chamber internal damping gas pressure intensity |
| CN108598857A (en) * | 2018-06-22 | 2018-09-28 | 王英棠 | Laser brightness adjusting part and laser |
| CN111141328A (en) * | 2019-12-26 | 2020-05-12 | 兰州空间技术物理研究所 | Atomic clock working environment monitoring device |
| CN113325686A (en) * | 2021-04-22 | 2021-08-31 | 温州激光与光电子协同创新中心 | Micro atomic clock physical unit applying spherical air chamber and spherical air chamber |
| CN114114884B (en) * | 2021-11-30 | 2023-06-23 | 中国计量科学研究院 | Coherent population trapping cold atomic clock based on grating chip and application method thereof |
| CN114675524B (en) * | 2022-04-08 | 2024-02-09 | 湖北科技学院 | Miniature CPT atomic clock physical system device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6303928B1 (en) * | 1998-12-21 | 2001-10-16 | The Aerospace Corporation | Continuous cold atom beam atomic system |
| CN1603984A (en) * | 2004-11-05 | 2005-04-06 | 中国科学院武汉物理与数学研究所 | Coherent arrangement imprisoned cold atomic clock |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6303928B1 (en) * | 1998-12-21 | 2001-10-16 | The Aerospace Corporation | Continuous cold atom beam atomic system |
| CN1603984A (en) * | 2004-11-05 | 2005-04-06 | 中国科学院武汉物理与数学研究所 | Coherent arrangement imprisoned cold atomic clock |
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