CN105553476A - Device, method and device for eliminating optical frequency shift - Google Patents
Device, method and device for eliminating optical frequency shift Download PDFInfo
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- CN105553476A CN105553476A CN201610068793.XA CN201610068793A CN105553476A CN 105553476 A CN105553476 A CN 105553476A CN 201610068793 A CN201610068793 A CN 201610068793A CN 105553476 A CN105553476 A CN 105553476A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 48
- 238000001914 filtration Methods 0.000 claims abstract description 40
- 229910052701 rubidium Inorganic materials 0.000 claims description 27
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 230000005283 ground state Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 abstract description 15
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract 2
- 230000008859 change Effects 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 241000931705 Cicada Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a device, method and device for eliminating optical frequency shift. The device at least comprises a spectrum lamp for generating pumping light; a resonant cavity located on the light path of the pumping light; an optical filter fixed between the spectrum lamp and the resonant cavity; an integrated filtering resonant bubble and a photocell, wherein the integrated filtering resonant bubble and the photocell are located in the resonant cavity; a microwave exploring signal generation circuit connected with the resonant cavity; and a microprocessor respectively connected to the spectrum lamp, the photocell and the microwave exploring signal generation circuit. The device, the method and the device of the invention are featured by eliminating the optical frequency shift, simple structure and wide applicability.
Description
Technical field
The invention belongs to technical field, particularly a kind of equipment, method and device for eliminating optical frequency shift.
Background technology
In the Rb atom frequency marking of reality, pumping light is not monochromatic light, but has the superposition of many spectrum lines of certain live width and linear function.Within the scope of pumping light optical lineshape function, some frequency component produces positive optical frequency shift, and another part frequency component produces negative optical frequency shift.The frequency displacement of the 0-0 transition that this nonmonochromatic light causes is the superposition of the frequency displacement that many monochromatic light cause.Therefore, to Rb atom frequency marking, spectrum line style and the light intensity of maintenance pumping light are constant, are very important on the impact of reduction optical frequency shift on frequency marking aging drift.Given this, how proposing a kind of system eliminating optical frequency shift, is the technical problem that the present invention continues to solve.
Summary of the invention
The invention provides a kind of equipment, method and device for eliminating optical frequency shift, solving or partly solving above-mentioned technical problem of the prior art.
According to one aspect of the present invention, providing a kind of equipment for eliminating optical frequency shift, comprising: spectroscopic lamp, for generation of pumping light; Resonant cavity, is placed in the light path of described pumping light, to receive described pumping light; Filter, is fixed between described spectroscopic lamp and described resonant cavity, carries out optical filtering process to make described filter to the pumping light in described light path; Integrated filtering resonance bubble and photocell, described integrated filtering resonance bubble and described photocell are all placed in described resonant cavity; Microwave seeks signal generating circuit, is connected with described resonant cavity; Microprocessor, seeks signal generating circuit with described spectroscopic lamp, described photocell and described microwave respectively and is connected.
Optionally, also comprise: the first thermostatic control module, described first thermostatic control module is connected with described spectroscopic lamp.
Optionally, also comprise: the second thermostatic control module, described second thermostatic control module resonates to steep with described integrated filtering and is connected.
According to another aspect of the present invention, provide a kind of method for eliminating optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, and described method comprises: by acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, make microwave frequency equal the frequency of described rubidium atomic ground state 0-0 transition; When second microwave pulse effect, light spectroscopic lamp, on maintenance microwave pulse exposure basis, carry out sampling light by microprocessor and detect; Close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, complete the servo of complete machine.
Optional: before a pumping light is by described integrated filtering resonance bubble, to use filter to filter to described pumping light.
Optional: the energisation mode of described spectroscopic lamp adopts square-wave voltage energisation mode.
According to another aspect of the invention, provide a kind of device for eliminating optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, the rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, and described device comprises: the first module, be configured to, by acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, make microwave frequency equal the frequency of described rubidium atomic ground state 0-0 transition; Second module, is configured to, when second microwave pulse effect, light spectroscopic lamp, on maintenance microwave pulse exposure basis, carries out sampling light detect by microprocessor; 3rd module, is configured to close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, completes the servo of complete machine.
Beneficial effect:
A kind of equipment for eliminating optical frequency shift provided by the invention, by resonant cavity being placed in the light path of described pumping light, to receive described pumping light; And filter is fixed between described spectroscopic lamp and described resonant cavity, to make described filter, optical filtering process is carried out to the pumping light in described light path; Meanwhile, described integrated filtering resonance bubble and described photocell are all placed in described resonant cavity; Microwave seeks signal generating circuit, is connected with described resonant cavity; Microprocessor, seeks signal generating circuit with described spectroscopic lamp, described photocell and described microwave respectively and is connected.Effectively achieve the elimination to optical frequency shift, have the advantages that the simple applicability of structure is wide.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, 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.
The structural representation of the equipment for eliminating optical frequency shift that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet of the method for eliminating optical frequency shift that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of the device for eliminating optical frequency shift that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the linear relationship schematic diagram of integrated filtering resonance bubble temperature and difference frequency in the embodiment of the present invention;
Fig. 5 is sequential process schematic in the embodiment of the present invention;
Fig. 6 is that in the embodiment of the present invention, pulse pumping light produces principle schematic.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention; Wherein involved in this enforcement "and/or" keyword, represent and or two kinds of situations, in other words, A and/or B mentioned by the embodiment of the present invention, illustrates A and B, A or B two kinds of situations, describes three kinds of states existing for A and B, as A and/or B, represent: only include A and do not comprise B; Only include B and do not comprise A; Comprise A and B.
Meanwhile, in the embodiment of the present invention, when assembly is called as " being fixed on " another assembly, directly can there is assembly placed in the middle in it on another assembly or also.When an assembly is considered to " connection " another assembly, it can be directly connected to another assembly or may there is assembly placed in the middle simultaneously.When an assembly is considered to " being arranged at " another assembly, it can be set directly on another assembly or may there is assembly placed in the middle simultaneously.The term " vertical " used in the embodiment of the present invention, " level ", "left", "right" and similar statement, just in order to illustration purpose, are not be intended to limit the present invention.
Refer to Fig. 1, embodiments providing a kind of equipment for eliminating optical frequency shift, comprising: spectroscopic lamp 101, for generation of pumping light; Resonant cavity 102, is placed in the light path of described pumping light, to receive described pumping light; Filter 103, is fixed between described spectroscopic lamp 101 and described resonant cavity 102, carries out optical filtering process to make described filter 103 to the pumping light in described light path; Integrated filtering resonance bubble 104 and photocell 105, described integrated filtering resonance bubble 104 and described photocell 105 are all placed in described resonant cavity 102; Microwave seeks signal generating circuit 106, is connected with described resonant cavity 102; Microprocessor 107, seeks signal generating circuit 106 with described spectroscopic lamp 101, described photocell 105 and described microwave respectively and is connected.
Specifically, a Rb atom frequency marking adjusted, the optical frequency shift of its quantum physics part can set to zero, and its frequency is just insensitive to the minor variations of pump intensity like this.But, in fact the size of optical frequency shift not only absorbs the pump intensity on steeping and is directly proportional to being irradiated to, and with to be irradiated to the line shape function relation absorbing the pumping light spectrum line steeped very close: within the scope of pumping light spectrum line line shape function, some frequency component produces positive optical frequency shift, and another part frequency component produces negative optical frequency shift.What is called adjusts to zero optical frequency shift, and only actually means that the summation of the optical frequency shift that each several part frequency component within the scope of pumping light spectrum line shape function causes is zero.So total optical frequency shift is zero result being actually the large optical frequency shift amount addition of positive and negative two.
Under these conditions, if Pump intensity changes and the line shape function of spectrum line does not change, then optical frequency shift still can be kept to be zero, if but there is small change in the line shape function of spectrum line, be easy to cause total optical frequency shift non-vanishing.And rubidium spectral lamp is in long-term work, does not carry on a shoulder pole Pump intensity and small change can occur, and also small change can be there is in pumping light spectrum line shape function.Spectroscopic lamp is in long-term work, and due to the change of its operating state, the factors such as the consumption of bulb 87Rb, light intensity changes, and affects the stability indicator of frequency marking.By experiment, complete machine output frequency can be found the insensitive parameter point of light intensity.We combine and consider at the selection of light intensity and integrated filtering the are resonated thermal creep stress that steeps, select suitable bubble temperature to make optical frequency shift reduce to minimum.Under selecting different light intensity during experiment, by changing the temperature of integrated filtering resonance bubble, measuring the output of overall frequency, obtaining the zero light intensity frequency displacement bubble temperature that we need.
In embodiments of the present invention, shown in Fig. 4, wherein, abscissa is the temperature of integrated filtering resonance bubble, and ordinate is difference frequency value.As can be seen from the figure, when integrated filtering resonance bubble thermal creep stress is at T=T0, complete machine output frequency has nothing to do with the strong I of spectrum light, the T0 i.e. bubble temperature of zero light intensity frequency displacement.Precisely, changing overall frequency curve measured by light intensity can not meet at a bit completely, meets at a little delta-shaped region often, therefore can not eliminate the impact of optical frequency shift on stability completely.When have selected best integrated filtering resonance bubble temperature, light intensity can accomplish 1 × 10 – 12/1% to the impact of frequency, i.e. light intensity change 1%, then what cause frequency is changed to 1 × 10 – 12.Certainly for different rubidium clock systems, the influence degree of light intensity to frequency is different, also can be different for the same system being operated in different conditions.As shown in Figure 4, for the pumping light varied in size, spectrum line style is identical, the difference frequency value change that the change of chamber temperature causes is different, the slope of 70% light intensity curve is less than the slope of 100% light intensity curve in the drawings, namely for 70% light intensity, the frequency displacement caused when chamber temperature changes is than little during 100% light intensity.If the selection of light intensity reduces (as 50% light intensity more further, 30% light intensity ...), according to the trend in figure, better slope light intensity can be obtained, but due to the signal to noise ratio of system will be considered, very little light intensity can not being selected, now needing proportioning and pressure by changing buffer gas in integrated filtering resonance bubble to obtain the light intensity of zero-temperature coefficient.
Therefore, the embodiment of the present invention adds a hyperfine composition filter 103 of magnetic by the rear class of launching light path at spectroscopic lamp 101, select different filters, can control spectroscopic lamp light intensity required in above-mentioned theory well, it is prior that can to improve pumping light spectrum linear, thus make pumping light spectrum linear around centre frequency full symmetric, and then reach the technique effect reducing optical frequency shift further and produce in embodiments of the present invention.
It should be noted that, the embodiment of the present invention also comprises the first thermostatic control module 108 and the second thermostatic control module 109, and described first thermostatic control module 108 is connected with described spectroscopic lamp 101.Described second thermostatic control module 109 and the described integrated filtering bubble 104 that resonates is connected.Make to be controlled by the operating ambient temperature of the first thermostatic control module 108 and the second thermostatic control module 109 pairs of spectroscopic lamps 101 and described integrated filtering resonance bubble 104, to ensure that it carries out work under isoperibol in the embodiment of the present invention.Meanwhile, resonant cavity 102 is also provided with magnetic field module (as field coil), to produce magnetic field.
Further, refer to Fig. 2, another embodiment of the present invention, additionally provide a kind of method for eliminating optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, and described method comprises:
Step 201, by acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, makes microwave frequency equal the frequency of described rubidium atomic ground state 0-0 transition;
Step 202, when second microwave pulse effect, lights spectroscopic lamp, on maintenance microwave pulse exposure basis, carries out sampling light detect by microprocessor;
Step 203, closes microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, completes the servo of complete machine.
Specifically, when a pumping light pulse is by Rb atom frequency marking integrated filtering resonance bubble, the rubidium atom absorbed in bubble is concentrated on five sub-energy levels of F=2, then act on rubidium atom with two relevant microwave pulses at certain hour interval that have, microwave frequency just in time equals the frequency of rubidium atomic ground state 0-0 transition.When second microwave pulse effect, light spectroscopic lamp simultaneously, on maintenance microwave pulse exposure basis, carry out sampling light by microprocessor to detect, after completing light detection, close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, complete the servo of complete machine, repeat according to this.The sequential of whole process can as shown in Figure 5, and the pulse pumping light shown in Fig. 6 produces schematic circuit schematic diagram.
As preferably, in the embodiment of the present invention, before a pumping light is by described integrated filtering resonance bubble, filter is used to filter to described pumping light.And the energisation mode of described spectroscopic lamp adopts square-wave voltage energisation mode.
Corresponding with said method embodiment, one more embodiment of the present invention provides a kind of device for eliminating optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, described device comprises: the first module, be configured to, by acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, make microwave frequency equal the frequency of described rubidium atomic ground state 0-0 transition; Second module, is configured to, when second microwave pulse effect, light spectroscopic lamp, on maintenance microwave pulse exposure basis, carries out sampling light detect by microprocessor; 3rd module, is configured to close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, completes the servo of complete machine.
Wherein, the embodiment of the method that the embodiment of the present invention provides, device embodiment are corresponding with above-mentioned apparatus embodiments, and non-detailed portion refers to apparatus embodiments, repeats no more herein.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said module illustrated as separating component can or may not be physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Above to equipment, method and device for eliminating optical frequency shift provided by the present invention, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, 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 (7)
1. for eliminating an equipment for optical frequency shift, it is characterized in that, comprising:
Spectroscopic lamp, for generation of pumping light;
Resonant cavity, is placed in the light path of described pumping light, to receive described pumping light;
Filter, is fixed between described spectroscopic lamp and described resonant cavity, carries out optical filtering process to make described filter to the pumping light in described light path;
Integrated filtering resonance bubble and photocell, described integrated filtering resonance bubble and described photocell are all placed in described resonant cavity;
Microwave seeks signal generating circuit, is connected with described resonant cavity;
Microprocessor, seeks signal generating circuit with described spectroscopic lamp, described photocell and described microwave respectively and is connected.
2. as claimed in claim 1 for eliminating the equipment of optical frequency shift, it is characterized in that, also comprise:
First thermostatic control module, described first thermostatic control module is connected with described spectroscopic lamp.
3. as claimed in claim 1 for eliminating the equipment of optical frequency shift, it is characterized in that, also comprise:
Second thermostatic control module, described second thermostatic control module resonates to steep with described integrated filtering and is connected.
4. for eliminating a method for optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, the rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, and it is characterized in that, described method comprises:
By acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, microwave frequency is made to equal the frequency of described rubidium atomic ground state 0-0 transition;
When second microwave pulse effect, light spectroscopic lamp, on maintenance microwave pulse exposure basis, carry out sampling light by microprocessor and detect;
Close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, complete the servo of complete machine.
5. method as claimed in claim 4, is characterized in that:
Before a pumping light is by described integrated filtering resonance bubble, filter is used to filter to described pumping light.
6. method as claimed in claim 5, is characterized in that:
The energisation mode of described spectroscopic lamp adopts square-wave voltage energisation mode.
7. for eliminating a device for optical frequency shift, be applied to pumping light, wherein, when a pumping light is by integrated filtering resonance bubble, the rubidium atom in described integrated filtering resonance bubble is concentrated on five sub-energy levels of F=2, and it is characterized in that, described device comprises:
First module, is configured to, by acting on described rubidium atom with two relevant microwave pulses at certain hour interval that have, make microwave frequency equal the frequency of described rubidium atomic ground state 0-0 transition;
Second module, is configured to, when second microwave pulse effect, light spectroscopic lamp, on maintenance microwave pulse exposure basis, carries out sampling light detect by microprocessor;
3rd module, is configured to close microwave pulse and spectroscopic lamp, and quantum correction information is passed to microwave interrogation signals generation circuit, completes the servo of complete machine.
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| CN201610068793.XA CN105553476A (en) | 2016-02-01 | 2016-02-01 | Device, method and device for eliminating optical frequency shift |
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| CN201610068793.XA CN105553476A (en) | 2016-02-01 | 2016-02-01 | Device, method and device for eliminating optical frequency shift |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639274A (en) * | 2018-12-13 | 2019-04-16 | 江汉大学 | Based on the device for improving optical pumping efficiency |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104382A (en) * | 2011-02-21 | 2011-06-22 | 江汉大学 | Method for reducing optical frequency shift of rubidium atomic frequency standard |
| CN102611448A (en) * | 2012-03-29 | 2012-07-25 | 江汉大学 | Method and device for optimizing long-period stability parameters of atomic frequency standard |
| CN103152039A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Method for reducing optical frequency shift of rubidium atom frequency scale |
| CN203119876U (en) * | 2013-02-04 | 2013-08-07 | 江汉大学 | Optical frequency shift optimizing device |
| CN203149049U (en) * | 2013-01-31 | 2013-08-21 | 江汉大学 | Overall performance detection system applicable to atomic clock |
-
2016
- 2016-02-01 CN CN201610068793.XA patent/CN105553476A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104382A (en) * | 2011-02-21 | 2011-06-22 | 江汉大学 | Method for reducing optical frequency shift of rubidium atomic frequency standard |
| CN102611448A (en) * | 2012-03-29 | 2012-07-25 | 江汉大学 | Method and device for optimizing long-period stability parameters of atomic frequency standard |
| CN103152039A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Method for reducing optical frequency shift of rubidium atom frequency scale |
| CN203149049U (en) * | 2013-01-31 | 2013-08-21 | 江汉大学 | Overall performance detection system applicable to atomic clock |
| CN203119876U (en) * | 2013-02-04 | 2013-08-07 | 江汉大学 | Optical frequency shift optimizing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639274A (en) * | 2018-12-13 | 2019-04-16 | 江汉大学 | Based on the device for improving optical pumping efficiency |
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