CN104317185A - Method and device for obtaining Ramsey-CPT spectrum - Google Patents
Method and device for obtaining Ramsey-CPT spectrum Download PDFInfo
- Publication number
- CN104317185A CN104317185A CN201410674252.2A CN201410674252A CN104317185A CN 104317185 A CN104317185 A CN 104317185A CN 201410674252 A CN201410674252 A CN 201410674252A CN 104317185 A CN104317185 A CN 104317185A
- Authority
- CN
- China
- Prior art keywords
- cpt
- ramsey
- vcsel
- frequency
- atom
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Semiconductor Lasers (AREA)
Abstract
The invention discloses a method for obtaining a Ramsey-CPT spectrum. The method includes the steps that a current periodically switched between I<1> and I<2> is coupled with microwaves to be input into a laser tube, wherein when the laser tube works with the current I<1>, the power of a positive first-stage sideband and the power of a negative first-stage sideband in polychromatic light output by the laser tube are maximum, and the frequency meets the requirement for CPT resonance with alkali metal atoms; after the current is switched, the jumping probability of all frequency components of the polychromatic light output by the laser tube and the alkali metal atoms is almost zero. In this way, the alkali metal atoms are switched between the state of being acted with lasers to generate CPT resonance and the interaction-free free relaxation state, and therefore Ramsey-CPT interference is generated. The invention further discloses a device for obtaining the Ramsey-CPT spectrum. By means of the scheme, a Ramsey-CPT atomic clock which is the same as a fashionable CPT atom clock in size and power consumption and better than the fashionable CPT atom clock in frequency stability can be achieved.
Description
Technical field
The present invention relates to passive-type Coherent Population Trapping imprison (CPT, Coherent Population Trapping) atomic clock field, be specifically related to a kind of method and the device that are obtained Ramsey-CPT spectrum by switch current amplitude.
Background technology
?passive-type CPT atomic clock is a kind of atomic clock that can realize chip-scale, to be frequency of utilization difference by the relevant bi-coloured light of microwave frequency control and alkali metal atom interact principle realizes CPT and resonate, by the CPT signal determined by atomic ground state hyperfine energy level difference, frequency discrimination is carried out to microwave frequency, thus microwave frequency locks by a formation feedback loop atomic ground state hyperfine energy level difference, realizes the rate-adaptive pacemaker that atomic clock is stable thus.
Small-sized C PT atomic clock scheme popular at present uses the electric current by microwave modulation to drive Vcsel (VCSEL) to export frequency modulation Multi Colour Lasers as light source, convert the linearly polarized light that VCSEL exports to circularly polarized light and atom effect with λ/4 slide, detection with atom effect after transmission laser obtain required for signal.Laser frequency frequency stabilization adopts atom pair heterogeneous light absorption line to realize as optical frequency frequency discrimination signal, and microwave frequency frequency stabilization adopts in polychromatic light ± and the CPT resonance line of 1 grade of sideband and atom effect realizes as microwave frequency discrimination signal.Popular scheme CPT atomic clock has volume advantage little, low in energy consumption compared with other atomic clock, but the frequency stability of the standard frequency be to provide is relatively on the low side, about level.
CPT resonance is interfered to combine with Ramsey-CPT and can realize Ramsey-CPT and interfere, interference fringe live width is narrower than CPT signal spectrum live width, and less with laser intensity change, the frequency stability of the standard frequency therefore provided as the atomic clock that microwave frequency discrimination signal realizes by interference fringe significantly can be better than popular scheme CPT atomic clock.
It is by atom and photoperiodism effect that Ramsey-CPT interferes, there is position interference between the CPT resonance of Different periods and realize, current more employing acousto-optic modulator (AOM, Acoustic Optical Modulator) modulating lasering beam realizes pulsed light, realizes atom and photoperiodism effect with pulsed light.But, use AOM to make atomic clock volume excessive, be not suitable for realizing practical miniaturized atomic clocks.Also be a kind of implementation with microwave periodic modulated laser, be specially and make export microwave periodic break-make or switch between two microwave frequencies at employing microwave switch, CPT resonates and then realizes Ramsey-CPT and interferes with making atom and photoperiodism.This scheme only increases microwave switch in circuit, therefore have ready conditions and realize practical miniaturized atomic clocks, but because being difficult to realize impedance perfect match, causing in handoff procedure, causing microwave reflection and microwave transient radiation to produce noise, making to implement the more difficult acquisition ideal effect of the program.The more important thing is, the program, in microwave section trip time, is monochromatic light and atom effect, now the modulation index of microwave to input VCSEL electric current is zero, according to optical frequency shift and modulation index relation, the optical frequency shift of generation is very large, is unfavorable for the long-term stability improving atomic clock.
Summary of the invention
The object of the present invention is to provide a kind of method obtaining Ramsey-CPT spectrum.The method periodically switches on by using the two current value drive laser varied in size, make laser and atom periodically CPT resonate and realize Ramsey-CPT and interfere, the method is easy to implement, the Ramsey-CPT interference effect obtained is better, the apparatus structure realized is simple and easy, volume is little, low in energy consumption, is suitable for realizing practical small-sized Ramsey-CPT atomic clock.
to achieve these goals, the present invention takes following technical measures:
Obtain a method for Ramsey-CPT spectrum, the steps include:
(1) VCSEL and atom steam bubble are stabilized in set temperature by VCSEL temperature control and atom steam bubble attemperating unit respectively.Field coil around atom steam bubble surface passes into electric current, produces the magnetic field of constant homogeneous.For preventing environmental magnetic field to the interference of system, atom steam bubble is placed in a permalloy magnetic shielding cylinder.
(2) PXI(PCI extensions for Instrumentation) system export periodically switch on two different amplitudes voltage to linear V-I change-over circuit, the periodicity obtained as shown in Figure 2 switches on two different amplitude current.One-period comprises T successively
1, T, T
2with tetra-time periods of T '.At T
1and T
2in time period, PXI system (1) exports predetermined voltage V
1(the corresponding output current of V-I change-over circuit is I
1); Within T and the T ' time period, PXI system (1) exports predetermined voltage V
2(the corresponding output current of V-I change-over circuit is I
2).According to alkali metal atom ground state hyperfine energy level difference h ν, microwave source output frequency is that the microwave of ν/2 is coupled with periodically variable electric current by Bias-Tee, and couple current makes VCSEL export frequency modulation polychromatic light as drive current input VCSEL.Because microwave frequency remains unchanged, electric current is at I
1and I
2between switch, therefore VCSEL export each frequency content of polychromatic light between difference on the frequency remain unchanged, but whole frequency spectrum differ about 20GHz two cover frequency spectrums between convert.
(3) polychromatic light that VCSEL exports incides atom steam bubble periodicity and atomic interaction.T
1in time period, electric current is I
1, in polychromatic light ± 1 grade of sideband and atomic interaction realize CPT and resonate; In T time section, electric current is I
2, VCSEL export polychromatic light overall frequency shift be about 20GHz, cause each sideband all with atom without interaction, the free relaxation of atom; T
2in time period, the value of electric current is reduced to I
1, ± 1 grade of sideband resonates with atoms at suitable temperatures CPT again, therefore T
1with T
2there is Ramsey-CPT interference in CPT state atom prepared by the time period; In the T ' time period, electric current is I
2polychromatic light again with atom off resonance, longer T ' is set CPT state atom relaxation is disappeared to basic.
(4) linearly polarized light beam adopting VCSEL to export and atom effect, and a polarization beam splitter prism (PBS is set in light path, Polarization Beam Splitter) light beam is divided into two equal light beams of the mutual vertical light intensity in polarization direction, detect respectively with two photodetectors and obtain the equal photosignal output of intensity, therefore when being subtracted each other by two photosignals, the differential signal obtained is zero.When light path being placed atom steam bubble and realizing light-atomic interaction, ± 1 grade of sideband optical frequency composition and atom occur to interact, and because of Faraday effect, polarization direction rotates, and other optical frequency composition is because of constant without interaction polarization direction with atom off resonance.In the photosignal that photodetector exports, except ± 1 grade of sideband, other frequency content and atom, without interaction, therefore only contribute to background noise, and the background noise in two photosignals is kept equal and is eliminated by differential technique.But ± 1 grade of sideband occurs that polarization direction rotates, therefore to obtain this part amount in photosignal unequal for two photodetectors, obtain differential signal non-vanishing and all derive from carry information needed ± 1 grade of sideband.Therefore, can background noise be eliminated by difference, significantly improve signal to noise ratio (S/N ratio).
(5) PXI Systematical control microwave source scan microwave frequency to change the Raman mismatching angle of ± 1 grade of sideband and atom by frequency step mode within the scope of care, at each curent change cyclomorphosis one secondary frequencies, and intercept from T from differential signal
2inside get the signal of a period as output, complete the Ramsey-CPT spectrum that scanning just can obtain be concerned about scope like this.Adopt phaselock technique, be easy to by microwave frequency continually and steadily at the maximal value place of the center striped of Ramsey-CPT spectrum, and then realize the closed loop locking of Ramsey-CPT atomic clock.
A kind of device obtaining Ramsey-CPT spectrum, comprise PXI system, one road analog output of PXI system exports and periodically switches on the voltage signal of two fixed values to V-I change-over circuit, another road analog output of PXI system is connected with the scanning trigger end of microwave source, the voltage signal that the periodicity of input is switched on two fixed values by V-I change-over circuit converts the current signal periodically switching on two fixed values to and is input to Bias-Tee, microwave source output frequency is that the microwave of the half of the hyperfine energy level difference on the frequency of alkali metal atom ground state is to Bias-Tee, microwave is carried out being coupled as drive current with the current signal periodically switching on two fixed values and is input to VCSEL by Bias-Tee, VCSEL Output of laser is after atom steam bubble, PXI system carries out the collection of photosignal to VCSEL Output of laser.
Obtain a device for Ramsey-CPT spectrum, also comprise PBS, VCSEL Output of laser is divided into two-way to be incident to the first photodetector and the second photodetector respectively by PBS after atom steam bubble;
The signal detected is input to PXI system by the first photodetector and the second photodetector.
Obtain a device for Ramsey-CPT spectrum, also comprise for respectively by VCSEL and atom steam bubble temperature stabilization in the VCSEL temperature control of design temperature and atom steam bubble temperature control, atom steam bubble by field coil around and be placed in magnetic shielding cylinder.
compared with prior art, the present invention has the following advantages:
(1) the present invention utilizes continuous microwave switch current modulation period to input VCSEL and realizes Ramsey-CPT interference, compares the volume and the power consumption that use AOM to considerably reduce atomic clock; Compare by microwave switching schemes without the need to microwave switch, the microwave reflection that there will not be microwave make and break process to occur and the moment electromagnetic field radiation of generation, have the advantage that noise is little.In free relaxation time section, microwave switching schemes is monochromatic light and atom effect, now the modulation index of microwave to input VCSEL electric current is zero, the optical frequency shift caused is very large, but the program is polychromatic light frequency spectrum overall frequency shift when being resonated by CPT is about 20GHz, almost nil with atomic transition probability, therefore optical frequency shift is less, is applied to atomic clock and will shows better long-term frequency stability.
(2) device compares popular CPT atomic clock, only need increase a PBS and photodetector in physical system, other parts are substantially constant, and therefore volume, power consumption are substantially constant, but interfere the Ramsey-CPT atomic clock performance realized better by Ramsey-CPT.
Accompanying drawing explanation
fig. 1 is a kind of device schematic diagram obtaining Ramsey-CPT spectrum.
Wherein: 1
-pXI system, 2
-microwave source, 3
-v-I change-over circuit, 4
-bias-Tee, 5
-vCSEL, 6
-vCSEL temperature control, 7
-magnetic shielding cylinder, 8
-atom steam bubble temperature control, 9
-field coil, 10
-atom steam bubble, 11
-pBS, 12
-first photodetector, 13
-second photodetector.
Fig. 2 is the cycle switch current sequential chart that produces after V-I change-over circuit of cycle switched voltage that exports of PXI system and Microwave Scanning sequential chart.Wherein T in one-period
1be the first light-atom effect period, T
2be the second light-atom effect period, T is the free relaxation period, and T ' is the eliminating coherence period, and t ＇ is for postponing the period, and t is the acquisition of signal period.
Fig. 3 is the spectral distribution schematic diagram of Multi Colour Lasers in one-period.
In Fig. 4 spectral line comparison diagram, spectral line is for adopting
87rb is work atom, adopt laser with
87the D1 line of Rb interacts and realizes CPT resonance, by Fig. 1 device by technology of the present invention, with
87rb is work atom, by laser with
87the D1 line of Rb interacts the Ramsey-CPT interference fringe spectral line obtained; And V-I change-over circuit exports constant I in Fig. 1
1, the CPT spectral line obtained under the condition that other experiment parameter is identical.
Embodiment
below in conjunction with accompanying drawing, obtain Fig. 4 experimental result with experimental system shown in a set of Fig. 1 and as an example technical scheme of the present invention is described in further detail.
Obtain a method for Ramsey-CPT spectrum, the steps include:
(1) VCSEL temperature control and atom steam bubble temperature control respectively by VCSEL and atom steam bubble temperature stabilization at 25 degrees Celsius and 45 degrees Celsius.Field coil passes into 1mA electric current, and the magnetic field of generation is 5 μ T.
(2) as shown in Figure 2, PXI system exports cycle switched voltage to V-I change-over circuit by analog output channel.Its high voltage appearance is 3.24V, and low-voltage is the conversion ratio of 3.051V, V-I change-over circuit is 2.7V/mA, the electric current I in the cycle switch current thus obtained
1for 1.2mA, electric current I
2for 1.13mA.T in corresponding this instance graph 2
1for 2ms, T are 1ms, T
2for 4.5ms, T ' be 10ms.
(3) frequency that microwave source exports is about 3.417GHz, power is after 3dBm microwave is coupled by Bias-Tee cycle switch current, export VCSEL input end to as drive current, therefore VCSEL exports the frequency modulation polychromatic light that modulation index is about 1.6, and the light intensity of wherein ± 1 grade of sideband is the strongest.The heterogeneous light frequency spectrum that each time period VCSEL exports within a switch current cycle as shown in Figure 3, the difference on the frequency of nearby frequency bands is the output frequency of microwave source.In Fig. 3, due to T
1and T
2in time period, VCSEL input current is all I
1, thus Output of laser frequency spectrum is identical, and in same T with the T ' time period, frequency spectrum is also identical.Input current is I
1time, in the polychromatic light that VCSEL exports ± 1 grade of sideband frequency correspondence
87rb atom two ground state is to the jump frequency of excited state.Because the tuning rate of input current to Output of laser frequency of used VCSEL is about 280GHz/mA, when input current is I
2time, the frequency of each spectrum component of polychromatic light all reduces about 20GHz, but between each composition, difference on the frequency remains unchanged.Therefore when electric current is I
2time, only have negative 6 to the frequency of negative 8 sidebands and atomic transition frequency close, but modulation index is about to the depth of modulation of 1.6,6 are approximately zero to negative 8 sideband powers, even if the CPT resonance effects that frequency meets the demands produced also can be ignored, so just realize T
1with T
2position interference is there is between CPT atom prepared by the time period.Therefore, Ramsey-CPT can be realized by switch current scheme to interfere.
(4) polychromatic light that VCSEL exports incides the first photodetector and the second photodetector respectively after atom steam bubble and PBS, according to two photodetector output signal adjustment PBS reach there is no light-atom effect time differential signal be zero.PXI system gathers the output signal of the first photodetector and the second photodetector respectively by two-way analog input channel.Wherein the sampling rate of two-way analog input channel is set to 200kSPS.PXI system, by digital signal processing, intercepts from T from the two-way image data in correspondence each switch current cycle
2the data starting to postpone to gather in the t period after a period of time t ＇ carry out subtracting each other and average, as shown in Figure 2.Wherein t ＇ and t is all set to 0.1ms.Because current amplitude sudden change occurs vibration in current switching moment VCSEL Output of laser frequency, choose t ＇ and reach the decision of basicly stable required time according to laser frequency, for the curent change amplitude of this example, get t ＇=0.1ms enough.T chooses and then determines according to the quality of Ramsey-CPT interference spectrum, and the intensity time of Ramsey-CPT interference signal exponentially decays, and the long signal amplitude of t can decline, and t is too short, to obtain the high frequency noise of interference spectum excessively strong.This example by experiment result is chosen t ＇ and t and is 0.1ms.
(5) PXI system exports Microwave Scanning trigger pip by digital output end and controls microwave source and carry out frequency sweeping according to sequential as shown in Figure 2.The frequency sweeping ranges that wherein Fig. 4 is corresponding is 3.417337GHz-3.417347GHz, and stepping amplitude is 5Hz, and the duration of each Frequency point is a switch current cycle.Meanwhile, as described in step (4), the output signal of PXI system to two photodetectors gathers and processes.Microwave frequency has scanned, and can obtain Ramsey-CPT spectrum as shown in (b) spectral line of Fig. 4.In order to compare, this example is identical and keep electric current to be I at other experiment condition
1constant, repeat CPT signal spectrum shown in (a) spectral line that namely above scanning process obtain Fig. 4.(a) spectral line in comparison diagram 4 is visible with (b) spectral line, and the signal amplitude of the center striped of Ramsey-CPT spectrum is suitable with CPT signal amplitude, and CPT signal live width is about 800Hz, and the center striped of Ramsey-CPT spectrum is only 320Hz.Therefore, the center striped of Ramsey-CPT spectrum is adopted to realize output frequency atomic clock more accurately as microwave frequency discrimination signal than adopting CPT spectral line.
As shown in Figure 1, a kind of device of the Ramsey-CPT of acquisition spectrum comprises: PXI system 1, microwave source 2, V-I change-over circuit 3, Bias-Tee 4, VCSEL 5, VCSEL temperature control 6, magnetic shielding cylinder 7, atom steam bubble temperature control 8, field coil 9, atom steam bubble 10, PBS11, the first photodetector 12, second photodetector 13.Annexation is: the output of V-I change-over circuit 3 and the output of microwave source 2 are connected with two input ends of Bias-Tee 4 respectively; The output terminal of Bias-Tee 4 is connected with the input end of VCSEL 5; VCSEL 5 Output of laser is incident to the first photodetector 12 and the second photodetector 13 respectively through atom steam bubble 10 and PBS11; The two-way analog input channel of PXI system 1 is connected with two photodetectors 12,13 respectively; One road analog output of PXI system 1 is connected with the input end of V-I change-over circuit 3; One railway digital output terminal of PXI system 1 is connected with the scanning trigger end of microwave source 2, carries out frequency sweeping for controlling microwave source 2; VCSEL temperature control 6 and the temperature of atom steam bubble temperature control 8 for VCSEL 5 and atom steam bubble 10 temperature stabilization are being needed; Atom steam bubble 10 by field coil 9 around, and to be placed in magnetic shielding cylinder 7.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (6)
1. obtain a method for Ramsey-CPT spectrum, it is characterized in that, comprise the following steps:
Step 1, respectively VCSEL (5) and atom steam bubble (10) are stabilized in the temperature of setting by VCSEL temperature control (6) and atom steam bubble temperature control (8), pass into field coil (9) magnetic field that electric current makes to produce constant homogeneous in atom steam bubble (10);
Step 2, PXI system (1) export and periodically switch on the voltage signal of two fixed values to V-I change-over circuit (3), the voltage signal that the periodicity of input is switched on two fixed values by V-I change-over circuit (3) converts the current signal periodically switching on two fixed values to and is input to Bias-Tee(4), it is that the microwave of the half of the hyperfine energy level difference on the frequency of alkali metal atom ground state is to Bias-Tee(4 that PXI system (1) controls microwave source (2) output frequency);
Step 3, Bias-Tee(4) microwave is carried out being coupled as drive current with the current signal periodically switching on two fixed values be input to VCSEL(5);
Step 4, VCSEL(5) Output of laser after atom steam bubble (10), by opto-electronic conversion, the light signal detected is converted to electric signal and is input to PXI system (1).
2. a kind of method obtaining Ramsey-CPT spectrum according to claim 1, it is characterized in that, described step 4 comprises the following steps:
Step 4.1, VCSEL(5) Output of laser passes through PBS(11 after atom steam bubble (10)) be divided into two-way to be incident to the first photodetector (12) and the second photodetector (13) respectively;
The light signal detected is converted to electric signal and is input to PXI system (1) by step 4.2, the first photodetector (12) and the second photodetector (13).
3. a kind of method obtaining Ramsey-CPT spectrum according to claim 1, it is characterized in that, the one-period that described periodicity switches on the voltage signal of two fixed values comprises T successively
1, T, T
2with tetra-time periods of T ', at T
1and T
2in time period, PXI system (1) exports predetermined voltage V
1; Within T and the T ' time period, PXI system (1) exports predetermined voltage V
2.
4. one kind obtains the device of Ramsey-CPT spectrum, comprise PXI system (1), it is characterized in that, one road analog output of PXI system (1) exports and periodically switches on the voltage signal of two fixed values to V-I change-over circuit (3), another road analog output of PXI system (1) is connected with the scanning trigger end of microwave source (2), the voltage signal that the periodicity of input is switched on two fixed values by V-I change-over circuit (3) converts the current signal periodically switching on two fixed values to and is input to Bias-Tee(4), microwave source (2) output frequency is that the microwave of the half of the hyperfine energy level difference on the frequency of alkali metal atom ground state is to Bias-Tee(4), Bias-Tee(4) microwave is carried out being coupled as drive current with the current signal periodically switching on two fixed values and be input to VCSEL(5), VCSEL (5) Output of laser is after atom steam bubble (10), PXI system (1) gathers the signal after opto-electronic conversion.
5. a kind of device obtaining Ramsey-CPT spectrum according to claim 4, it is characterized in that, also comprise PBS(11), VCSEL(5) Output of laser passes through PBS(11 after atom steam bubble (10)) be divided into two-way to be incident to the first photodetector (12) and the second photodetector (13) respectively;
The light signal detected is converted to electric signal and is input to PXI system (1) by the first photodetector (12) and the second photodetector (13).
6. a kind of device obtaining Ramsey-CPT spectrum according to claim 4, it is characterized in that, also comprise for respectively by VCSEL (5) and atom steam bubble (10) temperature stabilization in the VCSEL temperature control (6) of design temperature and atom steam bubble temperature control (8), atom steam bubble (10) by field coil (9) around and be placed in magnetic shielding cylinder (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410674252.2A CN104317185B (en) | 2014-11-21 | 2014-11-21 | A kind of method and device obtaining Ramsey-CPT spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410674252.2A CN104317185B (en) | 2014-11-21 | 2014-11-21 | A kind of method and device obtaining Ramsey-CPT spectrum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104317185A true CN104317185A (en) | 2015-01-28 |
| CN104317185B CN104317185B (en) | 2016-08-24 |
Family
ID=52372429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410674252.2A Active CN104317185B (en) | 2014-11-21 | 2014-11-21 | A kind of method and device obtaining Ramsey-CPT spectrum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104317185B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105577188A (en) * | 2015-12-17 | 2016-05-11 | 北京无线电计量测试研究所 | Method and device for realizing CPT atomic frequency standard |
| US20160269037A1 (en) * | 2015-03-12 | 2016-09-15 | Ricoh Company, Ltd. | Cpt resonance generation method, cpt resonance detection method, cpt resonance generation apparatus, atomic oscillator and magnetic sensor |
| 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 |
| CN107134998A (en) * | 2017-04-01 | 2017-09-05 | 北京无线电计量测试研究所 | A kind of Microwave Frequency Source |
| CN109425442A (en) * | 2017-08-22 | 2019-03-05 | 北京自动化控制设备研究所 | A kind of atomic air chamber internal temperature simple calibrating method |
| CN110649923A (en) * | 2019-11-13 | 2020-01-03 | 浙江大学 | Double-frequency detection coherent population trapping atomic clock and working method thereof |
| CN110783814A (en) * | 2019-10-28 | 2020-02-11 | 温州激光与光电子协同创新中心 | Small calcium atomic beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof |
| CN113406876A (en) * | 2021-06-18 | 2021-09-17 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN113534649A (en) * | 2021-05-31 | 2021-10-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN114415487A (en) * | 2021-12-09 | 2022-04-29 | 北京无线电计量测试研究所 | Automatic locking method and system for frequency of optical frequency atomic clock |
| CN115079552A (en) * | 2022-07-15 | 2022-09-20 | 中国科学院国家授时中心 | Diatomic clock and diatomic shared Ramsey cavity thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773612B (en) * | 2017-01-12 | 2019-09-20 | 中国科学院上海光学精密机械研究所 | Improve the system and method for atomic frequency stability |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6265945B1 (en) * | 1999-10-25 | 2001-07-24 | Kernco, Inc. | Atomic frequency standard based upon coherent population trapping |
| CN101656537B (en) * | 2009-07-21 | 2012-04-04 | 中国科学院武汉物理与数学研究所 | Method and device for preparing multi-pulse interference Ramsey-CPT stripe |
| CN103645627B (en) * | 2013-11-29 | 2016-06-22 | 中国科学院武汉物理与数学研究所 | A kind of microwave frequency that switches realizes the device and method of Ramsey-CPT atomic clock |
-
2014
- 2014-11-21 CN CN201410674252.2A patent/CN104317185B/en active Active
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160269037A1 (en) * | 2015-03-12 | 2016-09-15 | Ricoh Company, Ltd. | Cpt resonance generation method, cpt resonance detection method, cpt resonance generation apparatus, atomic oscillator and magnetic sensor |
| JP2016171419A (en) * | 2015-03-12 | 2016-09-23 | 株式会社リコー | Cpt resonance generation method, cpt resonance detection method, cpt resonance generator, atomic oscillator, magnetic sensor |
| US9954544B2 (en) * | 2015-03-12 | 2018-04-24 | Ricoh Company, Ltd. | CPT resonance generation method, CPT resonance detection method, CPT resonance generation apparatus, atomic oscillator and magnetic sensor |
| CN105577188A (en) * | 2015-12-17 | 2016-05-11 | 北京无线电计量测试研究所 | Method and device for realizing CPT atomic frequency standard |
| CN105577188B (en) * | 2015-12-17 | 2018-09-07 | 北京无线电计量测试研究所 | A kind of method and device for realizing CPT atomic frequency standards |
| 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 |
| CN106019179B (en) * | 2016-05-19 | 2018-09-18 | 北京航天控制仪器研究所 | A kind of quick locking method of CPT magnetometers |
| CN107134998A (en) * | 2017-04-01 | 2017-09-05 | 北京无线电计量测试研究所 | A kind of Microwave Frequency Source |
| CN109425442A (en) * | 2017-08-22 | 2019-03-05 | 北京自动化控制设备研究所 | A kind of atomic air chamber internal temperature simple calibrating method |
| CN109425442B (en) * | 2017-08-22 | 2020-07-24 | 北京自动化控制设备研究所 | Simple calibration method for internal temperature of atomic gas chamber |
| CN110783814A (en) * | 2019-10-28 | 2020-02-11 | 温州激光与光电子协同创新中心 | Small calcium atomic beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof |
| CN110783814B (en) * | 2019-10-28 | 2020-10-09 | 温州激光与光电子协同创新中心 | Small calcium atomic beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof |
| CN110649923A (en) * | 2019-11-13 | 2020-01-03 | 浙江大学 | Double-frequency detection coherent population trapping atomic clock and working method thereof |
| CN113534649A (en) * | 2021-05-31 | 2021-10-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN113534649B (en) * | 2021-05-31 | 2022-11-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN113406876A (en) * | 2021-06-18 | 2021-09-17 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN113406876B (en) * | 2021-06-18 | 2022-07-12 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN114415487A (en) * | 2021-12-09 | 2022-04-29 | 北京无线电计量测试研究所 | Automatic locking method and system for frequency of optical frequency atomic clock |
| CN114415487B (en) * | 2021-12-09 | 2023-12-05 | 北京无线电计量测试研究所 | Automatic locking method and system for optical frequency atomic clock frequency |
| CN115079552A (en) * | 2022-07-15 | 2022-09-20 | 中国科学院国家授时中心 | Diatomic clock and diatomic shared Ramsey cavity thereof |
| CN115079552B (en) * | 2022-07-15 | 2024-03-29 | 中国科学院国家授时中心 | Double atomic clock and Ramsey cavity shared by double atoms thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104317185B (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104317185A (en) | Method and device for obtaining Ramsey-CPT spectrum | |
| US11606064B2 (en) | Fourier domain mode-locked optoelectronic oscillator | |
| Zhou et al. | Generation of linear frequency-modulated waveforms by a frequency-sweeping optoelectronic oscillator | |
| CN101847994A (en) | Method and device for implementing Ramsey-CPT atomic frequency standard by microwave periodic On-Off modulation VCSEL | |
| CN110212987B (en) | Radio frequency linear frequency modulation signal generation method and device based on frequency spectrum splicing | |
| CN103645627B (en) | A kind of microwave frequency that switches realizes the device and method of Ramsey-CPT atomic clock | |
| Li et al. | Instantaneous microwave frequency measurement using a special fiber Bragg grating | |
| Ozdur et al. | Low noise optically tunable opto-electronic oscillator with Fabry–Perot etalon | |
| CN110572214B (en) | Frequency modulation signal generation method based on optical injection locking | |
| CN105242521A (en) | Device and method for achieving minitype CPT atomic clock physical system | |
| CN103326789A (en) | System and method for frequency tunable microwave phase shifting | |
| CN101656537B (en) | Method and device for preparing multi-pulse interference Ramsey-CPT stripe | |
| CN106100748B (en) | The method for generating microwave waveform using phase-modulator and adjustable chromatic dispersion device | |
| Zhang et al. | Microwave photonic signal generation for radar applications | |
| CN105577267A (en) | Optical fiber frequency transmission phase compensation device and method based on optical-electric oscillator principle | |
| CN110707511A (en) | Fourier domain mode-locked photoelectric oscillator based on stimulated Brillouin scattering loss spectrum | |
| CN113161863A (en) | Microwave pulse generation device and method based on time domain mode-locked photoelectric oscillator | |
| Wu et al. | Simultaneous triangular waveform signal and microwave signal generation based on dual-loop optoelectronic oscillator | |
| Zhou et al. | An RF-source-free reconfigurable microwave photonic radar with high-resolution and fast detection capability | |
| JP2008288390A (en) | Wavelength variable optical frequency stabilizing light source | |
| Liu et al. | Spurious Suppression in Millimeter-Wave OEO With a High-$ Q $ Optoelectronic Filter | |
| Lyu et al. | External modulation method for generating accurate linear optical FMCW | |
| Yu et al. | Photonic Generation of Precisely $\pi $ Phase-Coded Microwave Signal With Broadband Tunability | |
| Zhou et al. | Linear frequency-modulated waveform generation based on a tunable optoelectronic oscillator | |
| CN103929175B (en) | Quantum system device for CPT atomic frequency maker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171102 Address after: 430073 No. seven, No. 128, Optics Valley Road, East Lake Development Zone, Hubei, Wuhan Patentee after: Wuhan Zhongke Kaiwu Technology Co., Ltd. Address before: 430071 Wuchang, Wuhan, Hubei, Hongshan Patentee before: Wuhan Inst. of Physics and Mathematics, Chinese Academy of Sciences |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171123 Address after: 430000 Xiaohong Shanxi No. 30, Wuchang District, Wuhan, Hubei Patentee after: Wuhan Inst. of Physics and Mathematics, Chinese Academy of Sciences Address before: 430073 No. seven, No. 128, Optics Valley Road, East Lake Development Zone, Hubei, Wuhan Patentee before: Wuhan Zhongke Kaiwu Technology Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171204 Address after: 430000 Xiaohong Shanxi No. 30, Wuchang District, Wuhan, Hubei Patentee after: Wuhan Inst. of Physics and Mathematics, Chinese Academy of Sciences Address before: No. 128, Optics Valley seven, East Lake Development Zone, Wuhan, Hubei Patentee before: Wuhan Zhongke Kaiwu Technology Co., Ltd. |
|
| TR01 | Transfer of patent right |