CN104410416A - Coherent population trapping atomic frequency standard and method for improving short-term stability thereof - Google Patents
Coherent population trapping atomic frequency standard and method for improving short-term stability thereof Download PDFInfo
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Abstract
The invention discloses a coherent population trapping atomic frequency standard and a method for improving the short-term stability thereof and belongs to the field of atomic frequency standards. The atomic frequency standard comprises a voltage controlled crystal, a polarized excitation unit, a physical unit, a servo loop, a control unit and a system relaxation time detection unit. The polarized excitation unit is used for producing microwave searching signals according to the output frequency of the atomic frequency standards; the physical unit is used for producing optical detecting signals under the effect of the microwave searching signals; the servo loop is used for producing synchronous phase demodulation signals performing synchronous phase demodulation on the optical detecting signals; the control unit is used for producing rectifying voltage affecting the voltage controlled crystal according to the synchronous phase demodulation signals; the system relaxation time detection unit is used for detecting the system relaxation time delta t of the atomic frequency standard; the control unit is further used for performing timing control on an optical switch and the servo loop of the physical unit according to the system relaxation time delta t and controlling the servo loop to perform synchronous phase demodulation on the optical detecting signals produced by the physical signals after controlling the optical switch of the physical unit to switch on for N delta t.
Description
Technical field
The present invention relates to field of atomic frequency standard, particularly a kind of Coherent Population Trapping Trapping of Atoms frequency marking and improve the method for its short-term stability.
Background technology
Coherent Population Trapping imprison is (English: Coherent Population Trapping, be called for short: CPT) atomic frequency standard utilizes atom and coherent laser to interact a kind of quantum interference phenomenon produced and a kind of New type atom frequency marking realized, also be principle, uniquely can realize microminiaturized atomic frequency standard at present, its volume, power consumption are all little than Hydrogen Atom Frequency Standard, cesium atomic frequency standard, also much smaller compared with even minimum with current volume, power consumption Rb atom frequency marking.
The principle of CPT atomic frequency standard utilizes microwave to obtain double-colored coherent laser and atom effect to Laser Modulation, when the difference of double-colored coherent laser frequency equals ground state two hyperfine energy level difference on the frequencies of atom, atom is prepared to CPT state and weakens the absorption of light, laser intensity obtains intensity maxima by the absorption spectra from atom pair laser, namely electromagnetic induced transparency is (English: Electromagnetically Induced Transparency, be called for short: EIT) spectral line, then adopt EIT spectral line to go to lock VCXO as frequency discrimination spectral line.CPT atomic frequency standard is formed primarily of electronic circuit and physical location two part.The effect of electronic circuit produces the microwave carrying modulation intelligence acting on laser to seek signal, and electronic circuit also carries out synchronous phase demodulation to the light inspection signal of the frequency discrimination information of carrying that physical location exports and produces synchronous phase discrimination signal and act on VCXO.The effect of physical location is under microwave seeks the effect of signal, produce the light inspection signal with frequency discrimination special efficacy.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
When double-colored coherent laser and atom effect, a large amount of atom accumulates in the hyperfine sub-energy level state of ground state, form polarization dark-state phenomenon and the preparation of CPT atomic state can not be participated in, and then affecting the system signal noise ratio of CPT atomic frequency standard, being unfavorable for the short-term stability of the system of CPT atomic frequency standard.
Summary of the invention
In order to solve the problem of prior art, embodiments providing a kind of Coherent Population Trapping Trapping of Atoms frequency marking and improving the method for its short-term stability.Described technical scheme is as follows:
On the one hand, embodiments provide a kind of Coherent Population Trapping Trapping of Atoms frequency marking, described atomic frequency standard comprises:
VCXO;
Linear polarization exciting unit, seeks signal for producing microwave according to the output frequency of described VCXO;
Physical location, for seek signal at described microwave modulating action under produce double-colored coherent laser, described double-colored coherent laser and atom effect produce light and examine signal;
Servo loop, produces synchronous phase discrimination signal for carrying out synchronous phase demodulation to described light inspection signal;
Control unit, acts on described VCXO for producing correction voltage according to described synchronous phase discrimination signal;
System relaxation time detecting unit, for detecting the system relaxation time Δ t of described atomic frequency standard;
Described control unit, also for carrying out sequencing control according to system relaxation time Δ t to the optical switch in described physical location and described servo loop, after controlling the optical switch in described physical location and opening after N number of Δ t time span, control the light inspection signal that described servo loop produces described physical location and carry out synchronous phase demodulation, N be greater than 0 odd number.
In a kind of implementation of the embodiment of the present invention, described N is 3 or 5.
In the another kind of implementation of the embodiment of the present invention, described system relaxation time detecting unit comprises:
Ring oscillator, for receiving the output signal of described servo loop, and by anti-phase for the output signal of described servo loop rear output;
Perform subelement, for the output signal action according to described ring oscillator, control the switch of the optical switch in described physical location;
Detection sub-unit, for measuring the cycle of oscillation of described atomic frequency standard according to the output signal of described ring oscillator;
Obtain subelement, for obtaining the cycle of oscillation of described ring oscillator;
Computation subunit, for according to the cycle of oscillation of described atomic frequency standard and the system relaxation time calculating described atomic frequency standard cycle of oscillation of described ring oscillator.
In the another kind of implementation of the embodiment of the present invention, described ring oscillator is made up of odd number not gate and described not gate is at least 3.
In the another kind of implementation of the embodiment of the present invention, described computation subunit, the system relaxation time for atomic frequency standard according to following formulae discovery: Δ t=(T1-T0)/2;
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of described atomic frequency standard, and T0 is the cycle of oscillation of described ring oscillator.
In the another kind of implementation of the embodiment of the present invention, described optical switch is high-speed shutter Shutter.
On the other hand, the embodiment of the present invention additionally provides a kind of method improving Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, and described method comprises:
Detect the system relaxation time Δ t of atomic frequency standard;
Adopt the output frequency of VCXO to produce microwave and seek signal;
Produce double-colored coherent laser seek the modulating action of signal at described microwave under, described double-colored coherent laser and atom effect produce light and examine signal;
After controlling the optical switch in physical location and opening after N number of Δ t time span, control servo loop and synchronous phase demodulation carried out to the light inspection signal that described physical location produces, produce synchronous phase discrimination signal, N be greater than 0 odd number;
Produce correction voltage according to described synchronous phase discrimination signal to act on described VCXO.
In a kind of implementation of the embodiment of the present invention, described N is 3 or 5.
In the another kind of implementation of the embodiment of the present invention, the system relaxation time Δ t of described detection atomic frequency standard, comprising:
Ring oscillator is adopted to receive the output signal of described servo loop, and by anti-phase for the output signal of described servo loop rear output;
According to the output signal action of described ring oscillator, control the switch of the optical switch in described physical location;
The cycle of oscillation of described atomic frequency standard is measured according to the output signal of described ring oscillator;
Obtain the cycle of oscillation of described ring oscillator;
According to the cycle of oscillation of described atomic frequency standard and the system relaxation time calculating described atomic frequency standard cycle of oscillation of described ring oscillator.
In the another kind of implementation of the embodiment of the present invention, the system relaxation time calculating described atomic frequency standard cycle of oscillation of the described cycle of oscillation according to described atomic frequency standard and described ring oscillator, comprising:
The system relaxation time of atomic frequency standard according to following formulae discovery: Δ t=(T1-T0)/2;
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of described atomic frequency standard, and T0 is the cycle of oscillation of described ring oscillator.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By measuring the system relaxation time Δ t of atomic frequency standard, then when carrying out sequencing control to the optical switch in physical location and servo loop, after controlling the optical switch in physical location and opening after N number of Δ t time span, control servo loop and synchronous phase demodulation is carried out to the light inspection signal that physical location produces, namely the time of delay of light inspection signal being carried out to synchronous phase demodulation is added, due to be this time of delay the N of system relaxation time doubly, and N be greater than 0 odd number, so before carrying out synchronous phase demodulation, system have accumulated N correction error, be equivalent to add an integrator in systems in which, namely a noise is introduced in systems in which, due to N be greater than 0 odd number, N number of Δ t also will reach a millisecond magnitude, and other signals normally sinusoidal wave (there is even-order harmonic) in system, and frequency usually all can higher than 1MHz magnitude, therefore the noise that the sequential that N number of Δ t produces is introduced can not have influence on other signals in system, therefore do like this and the signal to noise ratio of system can be made to be improved, and then be conducive to system short-term stability.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the Coherent Population Trapping Trapping of Atoms frequency marking that the embodiment of the present invention one provides;
Fig. 2 is the schematic diagram of the cycle of oscillation of the ring oscillator that the embodiment of the present invention one provides;
Fig. 3 is the schematic diagram of the cycle of oscillation of the atomic frequency standard that the embodiment of the present invention one provides;
Fig. 4 is the flow chart of the method for the raising Coherent Population Trapping Trapping of Atoms frequency marking short-term stability that the embodiment of the present invention two provides;
Fig. 5 is the optical switch sequential that provides of the embodiment of the present invention and synchronous phase demodulation sequential chart.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide a kind of Coherent Population Trapping Trapping of Atoms frequency marking, see Fig. 1, this atomic frequency standard comprises:
VCXO 101;
Linear polarization exciting unit 102, seeks signal for producing microwave according to the output frequency of VCXO;
Physical location 103, for seek signal at microwave modulating action under produce double-colored coherent laser, double-colored coherent laser and atom effect produce light and examine signal;
Servo loop 104, produces synchronous phase discrimination signal for carrying out synchronous phase demodulation to light inspection signal;
Control unit 105, acts on VCXO for producing correction voltage according to synchronous phase discrimination signal;
System relaxation time detecting unit 106, for detecting the system relaxation time Δ t of atomic frequency standard;
Control unit 105, also for carrying out sequencing control according to system relaxation time Δ t to the optical switch in physical location and servo loop, after controlling the optical switch in physical location and opening after N number of Δ t time span, control light that servo loop produces physical location to examine signal and carry out synchronous phase demodulation, N be greater than 0 odd number.
Particularly, as shown in Figure 5, synchronous phase demodulation sequential is compared with optical switch sequential late N number of Δ t time for the sequencing control that the optical switch in control unit 105 pairs of physical locations and servo loop carry out.
Preferably, N can be 3 or 5.In an experiment, when N gets 3 or 5 can time atomic frequency standard obtain good short-term stability.
In embodiments of the present invention, linear polarization exciting unit 102 comprises times mixing subelement and comprehensive subelement, for adopting VCXO output frequency as with reference to signal, generating microwave seek signal by microprocessor and digital frequency synthesizer.
In embodiments of the present invention, physical location 103 comprises semiconductor laser, λ/4 wave plate, attenuator, resonant cavity and the photoelectric detection system be successively set in the light path of semiconductor laser, resonant cavity comprise be filled with alkali metal (as rubidium) and buffer gas chamber bulb apparatus, coil and magnetic screen, optical switch is located between semiconductor laser and chamber bulb apparatus.
In embodiments of the present invention, system relaxation time detecting unit 106 comprises:
Ring oscillator 1061, for receiving the output signal of servo loop, and by anti-phase for the output signal of servo loop rear output;
Perform subelement 1062, for the output signal action according to ring oscillator, control the switch of the optical switch in physical location;
Detection sub-unit 1063, for measuring the cycle of oscillation of atomic frequency standard according to the output signal of ring oscillator;
Obtain subelement 1064, for obtaining the cycle of oscillation of ring oscillator;
Computation subunit 1065, for according to the cycle of oscillation of atomic frequency standard and the system relaxation time calculating atomic frequency standard the cycle of oscillation of ring oscillator.
In embodiments of the present invention, ring oscillator 1061 is made up of odd number not gate and not gate is at least 3.In the present embodiment, not gate can be occurred by microprocessor.
Ring oscillator 1061 input receives the signal coming from servo loop, and ring oscillator 1061 output feeds back on the optical switch in physical location, ' opens ' or ' pass ' in order to control optical switch status.
As Fig. 2, odd number not gate is serially connected, and can produce self-oscillation, and this circuit forms a ring oscillator.If the number M of not gate is odd number in ring oscillator, the mean transit delay of each not circuit is t late, and the cycle of oscillation that ring oscillator produces is T0.Assuming that the initial state of certain moment A1 point is ' 1 ', then, after 1 transmission delay t, A2 point becomes ' 0 ', then becomes ' 1 ' through 1 transmission delay t, A3 point, and after an odd number M transmission delay Mt, initial state ' 1 ' becomes ' 0 '.Therefore, according to Fig. 2, can obtain:
T0＝2Mt (1)
After ring oscillator seals in atomic frequency standard system, when the optical switch in physical location is ' opening ' state, the light of laser excites filters in bubble by directly entering integrated resonance after optical switch, completes quantum frequency discrimination, produces light inspection signal.Light inspection signal, after servo loop process, is used for synchronous phase demodulation on the one hand; Send on the other hand in ring oscillator.Because laser excites light can through integrated filtering resonance bubble, so it is high level ' 1 ' that the moment produces through servo loop the signal sent in ring oscillator, and ring oscillator is made up of odd number not gate, therefore sending into signal in ring oscillator through odd number is non-becomes low level ' 0 ' behind the door, output signal the optical switch again acted in physical location, be ' pass ' state.Circulate successively, there will be ' 1 ', ' 0 ', ' 1 ' at the output of ring oscillator ..., ' 0 ' change, detected by the output frequency signal of ring oscillator, T1 cycle of oscillation of atomic frequency standard can be drawn.And the reason identical according to formula (1), T1 cycle of oscillation that can derive this atomic frequency standard according to Fig. 3 can be expressed as:
T1＝2(Mt+Δt) (2)
Wherein, Δ t is the system relaxation time of atomic frequency standard.By formula (1) and (2), can derive and draw:
Δt＝(T1-T0)/2 (3)
Namely in embodiments of the present invention, computation subunit 1065, the system relaxation time for according to following formulae discovery atomic frequency standard: Δ t=(T1-T0)/2;
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of atomic frequency standard, and T0 is the cycle of oscillation of ring oscillator.
In embodiments of the present invention, optical switch is high-speed shutter Shutter.
In embodiments of the present invention, control unit 105 can comprise microprocessor or programmable logic controller (PLC).
The embodiment of the present invention is by measuring the system relaxation time Δ t of atomic frequency standard, then when carrying out sequencing control to the optical switch in physical location and servo loop, after controlling the optical switch in physical location and opening after N number of Δ t time span, control servo loop and synchronous phase demodulation is carried out to the light inspection signal that physical location produces, namely the time of delay of light inspection signal being carried out to synchronous phase demodulation is added, due to be this time of delay the N of system relaxation time doubly, and N be greater than 0 odd number, so before carrying out synchronous phase demodulation, system have accumulated N correction error, be equivalent to add an integrator in systems in which, namely a noise is introduced in systems in which, due to N be greater than 0 odd number, N number of Δ t also will reach a millisecond magnitude, and other signals normally sinusoidal wave (there is even-order harmonic) in system, and frequency usually all can higher than 1MHz magnitude, therefore the noise that the sequential that N number of Δ t produces is introduced can not have influence on other signals in system, therefore do like this and the signal to noise ratio of system can be made to be improved, and then be conducive to system short-term stability.
Embodiment two
The embodiment of the present invention additionally provides a kind of method improving Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, and see Fig. 4, the method comprises:
Step 201: the system relaxation time Δ t detecting atomic frequency standard.
Particularly, step 201 can adopt following manner to realize:
Step one, employing ring oscillator receive the output signal of servo loop, and by anti-phase for the output signal of servo loop rear output.
Step 2, output signal action according to ring oscillator, control the switch of the optical switch in physical location.
Step 3, measure cycle of oscillation of atomic frequency standard according to the output signal of ring oscillator.
The cycle of oscillation of step 4, acquisition ring oscillator.
Step 5, according to the cycle of oscillation of atomic frequency standard and the system relaxation time calculating atomic frequency standard the cycle of oscillation of ring oscillator.
More specifically, in step 5, can according to the system relaxation time of following formulae discovery atomic frequency standard: Δ t=(T1-T0)/2.
Wherein, T1=2 (Mt+ Δ t), Δ t is the system relaxation time, and T1 is the cycle of oscillation of atomic frequency standard, and T0 is the cycle of oscillation of ring oscillator, and M is the number of not gate in ring oscillator, and t is the time of delay of each not gate.
Step 202: adopt the output frequency of VCXO to produce microwave and seek signal.
Step 203: produce double-colored coherent laser seek the modulating action of signal at microwave under, double-colored coherent laser and atom effect produce light and examine signal.
Particularly, step 203 realizes in the physical location of atomic frequency standard.
Step 204: after controlling the optical switch in physical location and opening after N number of Δ t time span, controls servo loop and examines signal to the light that physical location produces and carry out synchronous phase demodulation, produce synchronous phase discrimination signal, N be greater than 0 odd number.
Particularly, as shown in Figure 5, synchronous phase demodulation sequential is compared with optical switch sequential late N number of Δ t time for the sequencing control of carrying out the optical switch in physical location and servo loop.
Step 205: produce correction voltage according to synchronous phase discrimination signal and act on VCXO.
In a kind of implementation of the embodiment of the present invention, N is 3 or 5.
The embodiment of the present invention is by measuring the system relaxation time Δ t of atomic frequency standard, then when carrying out sequencing control to the optical switch in physical location and servo loop, after controlling the optical switch in physical location and opening after N number of Δ t time span, control servo loop and synchronous phase demodulation is carried out to the light inspection signal that physical location produces, namely the time of delay of light inspection signal being carried out to synchronous phase demodulation is added, due to be this time of delay the N of system relaxation time doubly, and N be greater than 0 odd number, so before carrying out synchronous phase demodulation, system have accumulated N correction error, be equivalent to add an integrator in systems in which, namely a noise is introduced in systems in which, due to N be greater than 0 odd number, N number of Δ t also will reach a millisecond magnitude, and other signals normally sinusoidal wave (there is even-order harmonic) in system, and frequency usually all can higher than 1MHz magnitude, therefore the noise that the sequential that N number of Δ t produces is introduced can not have influence on other signals in system, therefore do like this and the signal to noise ratio of system can be made to be improved, and then be conducive to system short-term stability.
It should be noted that: the Coherent Population Trapping Trapping of Atoms frequency marking that above-described embodiment provides is when improving short-term stability, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by equipment is divided into different functional modules, to complete all or part of function described above.In addition, the Coherent Population Trapping Trapping of Atoms frequency marking that above-described embodiment provides belongs to same design with the embodiment of the method improving Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, and its specific implementation process refers to embodiment of the method, repeats no more here.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Coherent Population Trapping Trapping of Atoms frequency marking, is characterized in that, described atomic frequency standard comprises:
VCXO;
Linear polarization exciting unit, seeks signal for producing microwave according to the output frequency of described VCXO;
Physical location, for seek signal at described microwave modulating action under produce double-colored coherent laser, described double-colored coherent laser and atom effect produce light and examine signal;
Servo loop, produces synchronous phase discrimination signal for carrying out synchronous phase demodulation to described light inspection signal;
Control unit, acts on described VCXO for producing correction voltage according to described synchronous phase discrimination signal;
System relaxation time detecting unit, for detecting the system relaxation time Δ t of described atomic frequency standard;
Described control unit, also for carrying out sequencing control according to system relaxation time Δ t to the optical switch in described physical location and described servo loop, after controlling the optical switch in described physical location and opening after N number of Δ t time span, control the light inspection signal that described servo loop produces described physical location and carry out synchronous phase demodulation, N be greater than 0 odd number.
2. atomic frequency standard according to claim 1, is characterized in that, described N is 3 or 5.
3. atomic frequency standard according to claim 1, is characterized in that, described system relaxation time detecting unit comprises:
Ring oscillator, for receiving the output signal of described servo loop, and by anti-phase for the output signal of described servo loop rear output;
Perform subelement, for the output signal action according to described ring oscillator, control the switch of the optical switch in described physical location;
Detection sub-unit, for measuring the cycle of oscillation of described atomic frequency standard according to the output signal of described ring oscillator;
Obtain subelement, for obtaining the cycle of oscillation of described ring oscillator;
Computation subunit, for according to the cycle of oscillation of described atomic frequency standard and the system relaxation time calculating described atomic frequency standard cycle of oscillation of described ring oscillator.
4. atomic frequency standard according to claim 3, is characterized in that, described ring oscillator is made up of odd number not gate and described not gate is at least 3.
5. atomic frequency standard according to claim 3, is characterized in that, described computation subunit, the system relaxation time for atomic frequency standard according to following formulae discovery: Δ t=(T1-T0)/2;
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of described atomic frequency standard, and T0 is the cycle of oscillation of described ring oscillator.
6. the atomic frequency standard according to any one of claim 1-5, is characterized in that, described optical switch is high-speed shutter Shutter.
7. improve a method for Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, it is characterized in that, described method comprises:
Detect the system relaxation time Δ t of atomic frequency standard;
Adopt the output frequency of VCXO to produce microwave and seek signal;
Produce double-colored coherent laser seek the modulating action of signal at described microwave under, described double-colored coherent laser and atom effect produce light and examine signal;
After controlling the optical switch in physical location and opening after N number of Δ t time span, control servo loop and synchronous phase demodulation carried out to the light inspection signal that described physical location produces, produce synchronous phase discrimination signal, N be greater than 0 odd number;
Produce correction voltage according to described synchronous phase discrimination signal to act on described VCXO.
8. method according to claim 7, is characterized in that, described N is 3 or 5.
9. method according to claim 7, is characterized in that, the system relaxation time Δ t of described detection atomic frequency standard, comprising:
Ring oscillator is adopted to receive the output signal of described servo loop, and by anti-phase for the output signal of described servo loop rear output;
According to the output signal action of described ring oscillator, control the switch of the optical switch in described physical location;
The cycle of oscillation of described atomic frequency standard is measured according to the output signal of described ring oscillator;
Obtain the cycle of oscillation of described ring oscillator;
According to the cycle of oscillation of described atomic frequency standard and the system relaxation time calculating described atomic frequency standard cycle of oscillation of described ring oscillator.
10. method according to claim 9, is characterized in that, the system relaxation time calculating described atomic frequency standard cycle of oscillation of the described cycle of oscillation according to described atomic frequency standard and described ring oscillator, comprising:
The system relaxation time of atomic frequency standard according to following formulae discovery: Δ t=(T1-T0)/2;
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of described atomic frequency standard, and T0 is the cycle of oscillation of described ring oscillator.
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| CN106019179A (en) * | 2016-05-19 | 2016-10-12 | 北京航天控制仪器研究所 | Rapid frequency locking method of CPT magnetometer |
| CN107846219A (en) * | 2017-10-27 | 2018-03-27 | 江汉大学 | A kind of modified CPT atomic state resonator systems |
| CN109856472A (en) * | 2018-12-13 | 2019-06-07 | 江汉大学 | Catch calibrating installation in miniaturization fishpond based on multi-way detecting signal |
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| CN103152039A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Method for reducing optical frequency shift of rubidium atom frequency scale |
| US20140197826A1 (en) * | 2013-01-17 | 2014-07-17 | The Secretary, Department Of Atomic Energy | Dual purpose atomic device for realizing atomic frequency standard and magnetic field measurement |
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| CN101951261A (en) * | 2010-10-08 | 2011-01-19 | 中国科学院武汉物理与数学研究所 | All-digital servo gear of passive coherent population trapping atomic frequency standard |
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| US20140197826A1 (en) * | 2013-01-17 | 2014-07-17 | The Secretary, Department Of Atomic Energy | Dual purpose atomic device for realizing atomic frequency standard and magnetic field measurement |
| CN103152039A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Method for reducing optical frequency shift of rubidium atom frequency scale |
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| CN106019179A (en) * | 2016-05-19 | 2016-10-12 | 北京航天控制仪器研究所 | Rapid frequency locking method of CPT magnetometer |
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| CN107846219A (en) * | 2017-10-27 | 2018-03-27 | 江汉大学 | A kind of modified CPT atomic state resonator systems |
| CN109856472A (en) * | 2018-12-13 | 2019-06-07 | 江汉大学 | Catch calibrating installation in miniaturization fishpond based on multi-way detecting signal |
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| CN104410416B (en) | 2017-12-01 |
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