CN114415487B - Automatic locking method and system for optical frequency atomic clock frequency - Google Patents
Automatic locking method and system for optical frequency atomic clock frequency Download PDFInfo
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- CN114415487B CN114415487B CN202111502002.7A CN202111502002A CN114415487B CN 114415487 B CN114415487 B CN 114415487B CN 202111502002 A CN202111502002 A CN 202111502002A CN 114415487 B CN114415487 B CN 114415487B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007704 transition Effects 0.000 claims abstract description 41
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims description 37
- 238000004590 computer program Methods 0.000 claims description 18
- 238000001228 spectrum Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 abstract description 20
- 239000011575 calcium Substances 0.000 abstract description 20
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 238000004891 communication Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000000872 buffer Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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Abstract
The application provides an automatic locking method and system for the frequency of an optical frequency atomic clock, which are characterized in that the frequency of a first resonant laser is stabilized in a first frequency range of atomic transition of a calcium atomic stream by adjusting corresponding laser parameters, and a second resonant laser is firstly subjected to frequency stabilization in a resonant cavity and then is subjected to locking from a second resonant laser offset to the atomic resonant frequency, so that the locking of two lasers can be controlled simultaneously, the labor investment is reduced, and the manpower resources are saved; the artificial interference is reduced, and the artificial locking is avoided; and after losing the lock, the recovery speed is high.
Description
Technical Field
The application relates to a laser frequency stabilization technology, in particular to an automatic locking method and system for the frequency of an optical frequency atomic clock.
Background
The optical frequency atomic clock adopts a transfer detection technology to detect clock transition spectral lines, and the whole experimental system needs two lasers: 423nm blue laser and 657nm Zhong Yueqian laser. The system implementation process requires three loop locks to be completed sequentially: locking of 423nm laser to atomic transition spectral line, locking of 657nm laser to PDH resonant cavity and locking of 657nm laser offset to atomic resonance frequency. The system operation quality index is the system closed loop stability, and the index is directly related to the system locking continuous locking time, so that a manual on duty mode is adopted in the previous experiment, more manpower is consumed, and the experiment efficiency is reduced.
Disclosure of Invention
To solve at least one of the above problems, a first aspect of the present application provides an optical frequency atomic clock frequency automatic locking method, including:
acquiring a first resonance laser and a second resonance laser;
adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
Further, the method for automatically locking the frequency of the optical frequency atomic clock further comprises the following steps:
and determining the current frequency difference before and after the second resonance laser performs iterative operation, and generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, wherein when the relay circuit is positioned in the set switching parameter, the adjusting circuit receives a transmission signal of the resonant cavity and outputs a preset voltage.
Further, the method for automatically locking the frequency of the optical frequency atomic clock further comprises the following steps:
and judging whether the interference pattern of the first resonant laser and the second resonant laser is correct.
Further, the adjusting the frequency of the first resonant laser to a first frequency range in which the atomic transition of the calcium atom stream occurs includes:
adjusting the voltage and current of the laser corresponding to the first resonant laser so as to enable the wavelength of the first resonant laser to reach a target wavelength value;
according to the laser saturation spectrum signal, calculating to obtain the peak value of the atomic resonance frequency;
the first resonant laser frequency is locked to a peak of the atomic resonance frequency.
Further, the adjusting the laser corresponding to the second resonant laser, and transmitting the laser to a resonant cavity after frequency locking to stabilize the current frequency of the second resonant laser includes:
adjusting the rotation angle of the stepping motor of the laser corresponding to the second resonance laser with a set stepping value until the amplitude value of the transmission signal of the corresponding laser meets a first set condition, and suspending the rotation of the stepping motor;
adjusting the current of the laser corresponding to the second resonance laser by setting amplification, and recording the amplitude value of the corresponding transmission signal;
rotating the stepper motor when the amplitude value of the transmission signal meets a second set condition;
when the transmission signal amplitude value meets a third set condition, recording the rotation angle of the stepping motor when the transmission signal amplitude value reaches the maximum, and suspending the rotation of the stepping motor;
and adjusting the rotation angle of the stepping motor to the rotation angle corresponding to the stepping motor when the amplitude value of the transmission signal is maximum, thereby completing the current frequency locking of the second resonance laser.
Further, the determining whether the interference patterns of the first resonant laser and the second resonant laser are correct includes:
acquiring a data sequence of the first resonant laser and the second resonant laser interference pattern at the current moment;
selecting a data sequence within a set threshold range, and calculating to obtain a peak value point in the data sequence;
calculating the difference value between the data sequence of the maximum value in the set threshold range and the data sequence of the peak point;
if the difference is higher than a set value, the interference patterns of the first resonant laser and the second resonant laser are judged to be correct.
In a second aspect, the present application provides an optical frequency atomic clock frequency automatic locking system, comprising:
and the laser acquisition module is used for: acquiring a first resonance laser and a second resonance laser;
a first laser adjustment module: adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and a second laser adjustment module: and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
Further, the optical frequency atomic clock frequency automatic locking system further comprises:
and the laser offset adjustment module is used for: and determining the current frequency difference before and after the second resonance laser performs iterative operation, and generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, wherein when the relay circuit is positioned in the set switching parameter, the adjusting circuit receives a transmission signal of the resonant cavity and outputs a preset voltage.
A third aspect of the application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of automatically locking the frequency of any one of the optical frequency atomic clocks described above when the computer program is executed.
A fourth aspect of the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method for automatically locking the frequency of an optical frequency atomic clock as set forth in any one of the preceding claims.
The beneficial effects of the application are that
The application provides an automatic locking method and system for the frequency of an optical frequency atomic clock, which are characterized in that the frequency of a first resonant laser is stabilized in a first frequency range of atomic transition of a calcium atomic stream by adjusting corresponding laser parameters, and a second resonant laser is firstly subjected to frequency stabilization in a resonant cavity and then is subjected to locking from a second resonant laser offset to the atomic resonant frequency, so that the locking of two lasers can be controlled simultaneously, the labor investment is reduced, and the manpower resources are saved; the artificial interference is reduced, and the artificial locking is avoided; and after losing the lock, the recovery speed is high.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an operation scheme of an automatic locking method for an optical frequency atomic clock according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
At present, an artificial on duty mode is adopted in the optical frequency atomic clock experiment, so that more manpower is consumed, and the experiment efficiency is reduced.
Based on the above, the application provides an automatic locking method for the frequency of an optical frequency atomic clock, which comprises the following steps:
acquiring a first resonance laser and a second resonance laser;
adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
In some other embodiments, the optical frequency atomic clock frequency automatic locking method further comprises:
and determining the current frequency difference before and after the second resonance laser performs iterative operation, and generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, wherein when the relay circuit is positioned in the set switching parameter, the adjusting circuit receives a transmission signal of the resonant cavity and outputs a preset voltage.
In some other embodiments, the optical frequency atomic clock frequency automatic locking method further comprises:
and judging whether the interference pattern of the first resonant laser and the second resonant laser is correct.
In some other embodiments, the adjusting the frequency of the first resonant laser to a first frequency range in which the stream of calcium atoms undergoes an atomic transition comprises:
adjusting the voltage and current of the laser corresponding to the first resonant laser so as to enable the wavelength of the first resonant laser to reach a target wavelength value;
according to the laser saturation spectrum signal, calculating to obtain the peak value of the atomic resonance frequency;
the first resonant laser frequency is locked to a peak of the atomic resonance frequency.
In some other embodiments, the adjusting the laser corresponding to the second resonant laser and emitting the laser to a resonant cavity after frequency locking to stabilize the current frequency of the second resonant laser includes:
adjusting the rotation angle of the stepping motor of the laser corresponding to the second resonance laser with a set stepping value until the amplitude value of the transmission signal of the corresponding laser meets a first set condition, and suspending the rotation of the stepping motor;
adjusting the current of the laser corresponding to the second resonance laser by setting amplification, and recording the amplitude value of the corresponding transmission signal;
rotating the stepper motor when the amplitude value of the transmission signal meets a second set condition;
when the transmission signal amplitude value meets a third set condition, recording the rotation angle of the stepping motor when the transmission signal amplitude value reaches the maximum, and suspending the rotation of the stepping motor;
and adjusting the rotation angle of the stepping motor to the rotation angle corresponding to the stepping motor when the amplitude value of the transmission signal is maximum, thereby completing the current frequency locking of the second resonance laser.
In some other embodiments, the determining whether the interference patterns of the first resonant laser and the second resonant laser are correct comprises:
acquiring a data sequence of the first resonant laser and the second resonant laser interference pattern at the current moment;
selecting a data sequence within a set threshold range, and calculating to obtain a peak value point in the data sequence;
calculating the difference value between the data sequence of the maximum value in the set threshold range and the data sequence of the peak point;
if the difference is higher than a set value, the interference patterns of the first resonant laser and the second resonant laser are judged to be correct.
In another aspect, the present application provides an optical frequency atomic clock frequency automatic locking system, including:
and the laser acquisition module is used for: acquiring a first resonance laser and a second resonance laser;
a first laser adjustment module: adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and a second laser adjustment module: and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
In some other embodiments, the optical frequency atomic clock frequency automatic locking system further comprises:
and the laser offset adjustment module is used for: and determining the current frequency difference before and after the second resonance laser performs iterative operation, and generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, wherein when the relay circuit is positioned in the set switching parameter, the adjusting circuit receives a transmission signal of the resonant cavity and outputs a preset voltage.
It is understood that the first resonant laser is a 423nm blue laser and the second resonant laser is a 657nm Zhong Yueqian laser. As shown in fig. 1, the lasers used in the calcium atom light Zhong Jitong are two sets, and the number of the locking loops is 3, namely, 423nm laser frequency to atomic resonance frequency locking, 657nm laser frequency to resonant cavity frequency locking and 657nm laser offset to atomic resonance frequency locking. The linkage operation of the three locking loops is realized according to the scheme of fig. 1: 423nm and 657nm laser opening automatic locking, completing the locking of 657nm laser offset to atomic resonance frequency, monitoring the locking state in real time, and closing the locking switches of the loop 1 and the loop 3 if the loop 1 is out of lock; if loop 2 is out of lock, the locked state of loop 2 and loop 3 is closed-the lock is reopened.
The operation steps of the automatic locking system for the frequency of the optical frequency atomic clock are specifically described below with reference to specific embodiments.
Step 1: the system remotely collects interference patterns of 423nm laser and 657nm laser and judges whether the interference patterns are correct. Firstly, remotely capturing an interference pattern data sequence at the current moment by a system; secondly, the system screens out data sequences between the maximum value and the next maximum value (left closed and right open) which are larger than a set threshold A, and calculates peak points (only one) in the data sequences; finally, the system calculates the distance B between the maximum and the peak point. If B is larger than the system set value, judging that 423nm laser and 657nm laser are in correct interference images, otherwise, increasing the current by 0.01mA, and repeating the steps.
Step 2: the system remotely controls the stepping motor to rotate to gradually increase 657nm current gain, the stepping motor rotates for 2 degrees, the system acquires transmission signal amplitude in real time, when the transmission signal amplitude gradually rises to 0.7V and suddenly drops to the vicinity of 0V, the rotation of the stepping motor is suspended to increase 0.01mA to gradually increase current until the transmission signal amplitude returns to 0.7V, the stepping motor is continuously rotated, the transmission signal amplitude is repeatedly observed, and the rotation of the stepping motor is stopped when the transmission signal amplitude slowly drops after rising to the maximum value; finally, the system completes 657nm laser locking by stepping and rotating to the maximum amplitude of the transmission signal.
Step 3: based on the step 2, the system remotely adjusts the voltage and current of the 423nm laser to enable the 423nm laser to be at the target wavelength, and then remotely captures a saturation spectrum signal, calculates a peak value and locks the 423nm laser to the point.
Step 4: in a locking loop from 657nm laser offset to atomic resonance frequency, the system replaces a manual switch with a three-way programmable relay, and after 423nm laser and 657nm laser complete automatic locking, the system remotely controls the programmable relay to realize automatic locking from 657nm laser offset to atomic resonance frequency.
Step 5: after the system completes the locking of the three loops, the system enters a mode of monitoring the locking state, and if the laser of 423nm or 657nm is out of lock, the system closes the locking switches of the three loops and locks again automatically. The system monitors the amplitude of the transmission signal in real time, and judges out-of-lock when the amplitude is lower than 200 mV; and after the system detects out-of-lock, the system immediately exits the locking mode and enters a re-locking mode.
In order to solve the problems that the existing optical frequency atomic clock experiment adopts a manual on duty mode, consumes more manpower and reduces the experiment efficiency, the application provides an embodiment of electronic equipment for realizing all or part of contents in an optical frequency atomic clock frequency automatic locking method, and the electronic equipment specifically comprises the following contents:
fig. 2 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 2, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 2 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions.
In an embodiment, the frequency auto-lock function may be integrated into the central processor. Wherein the central processor may be configured to control:
acquiring a first resonance laser and a second resonance laser;
adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
As can be seen from the above description, the present application provides an electronic device, by adjusting the parameters of the corresponding lasers, so that the frequency of the first resonant laser is stabilized in the first frequency range where the atomic transition occurs in the calcium atom flow, and the second resonant laser is first frequency stabilized in the resonant cavity and then locked from the offset of the second resonant laser to the atomic resonant frequency, so that the locking of the two lasers can be controlled simultaneously, the labor input is reduced, and the manpower resources are saved; the artificial interference is reduced, and the artificial locking is avoided; and after losing the lock, the recovery speed is high.
In another embodiment, the optical frequency atomic clock frequency automatic locking system may be configured separately from the central processor 9100, for example, the optical frequency atomic clock frequency automatic locking system may be configured as a chip connected to the central processor 9100, and the frequency automatic locking function is implemented by control of the central processor.
As shown in fig. 2, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 need not include all of the components shown in fig. 2; in addition, the electronic device 9600 may further include components not shown in fig. 2, and reference may be made to the related art.
As shown in fig. 2, the central processor 9100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 9100 receives inputs and controls the operation of the various components of the electronic device 9600.
The memory 9140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information about failure may be stored, and a program for executing the information may be stored. And the central processor 9100 can execute the program stored in the memory 9140 to realize information storage or processing, and the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.
The memory 9140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, etc. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 storing application programs and function programs or a flow for executing operations of the electronic device 9600 by the central processor 9100.
The memory 9140 may also include a data store 9143, the data store 9143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, address book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. A communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of conventional mobile communication terminals.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132 to implement usual telecommunications functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100 so that sound can be recorded locally through the microphone 9132 and sound stored locally can be played through the speaker 9131.
The embodiment of the present application also provides a computer readable storage medium capable of implementing all the steps in the optical frequency atomic clock frequency automatic locking method in the above embodiment, where the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the optical frequency atomic clock frequency automatic locking method in which the execution subject is a server or a client, for example, the processor implements the following steps when executing the computer program:
acquiring a first resonance laser and a second resonance laser;
adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
and executing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range in which atomic transition occurs in the calcium atomic stream, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeating whether the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream until the current frequency of the second resonant laser is in the second frequency range in which atomic transition occurs in the calcium atomic stream.
As can be seen from the above description, the present application provides a computer readable medium, by adjusting the corresponding laser parameters, the frequency of the first resonant laser is stabilized in the first frequency range where the atomic transition occurs in the calcium atom flow, and the second resonant laser is first frequency stabilized in the resonant cavity, and then the second resonant laser offset is locked to the atomic resonant frequency, so that the locking of the two lasers can be controlled simultaneously, the labor input is reduced, and the manpower resources are saved; the artificial interference is reduced, and the artificial locking is avoided; and after losing the lock, the recovery speed is high.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principles and embodiments of the present application have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. An automatic locking method for the frequency of an optical frequency atomic clock is characterized by comprising the following steps:
acquiring a first resonance laser and a second resonance laser;
adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
the adjusting the frequency of the first resonant laser to a first frequency range in which the atomic transition of the calcium atom stream occurs comprises:
adjusting the voltage and current of the laser corresponding to the first resonant laser so as to enable the wavelength of the first resonant laser to reach a target wavelength value;
according to the laser saturation spectrum signal, calculating to obtain the peak value of the atomic resonance frequency;
locking the first resonant laser frequency to a peak of the atomic resonance frequency;
performing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range of atomic transition of calcium atom flow, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeatedly judging whether the current frequency of the second resonant laser is in the second frequency range of atomic transition of calcium atom flow until the current frequency of the second resonant laser is in the second frequency range of atomic transition of calcium atom flow;
the adjusting the laser corresponding to the second resonance laser, and transmitting the laser to a resonant cavity after frequency locking so as to stabilize the current frequency of the second resonance laser comprises:
adjusting the rotation angle of the stepping motor of the laser corresponding to the second resonance laser with a set stepping value until the amplitude value of the transmission signal of the corresponding laser meets a first set condition, and suspending the rotation of the stepping motor;
adjusting the current of the laser corresponding to the second resonance laser by setting amplification, and recording the amplitude value of the corresponding transmission signal;
rotating the stepper motor when the amplitude value of the transmission signal meets a second set condition;
when the transmission signal amplitude value meets a third set condition, recording the rotation angle of the stepping motor when the transmission signal amplitude value reaches the maximum, and suspending the rotation of the stepping motor;
and adjusting the rotation angle of the stepping motor to the rotation angle corresponding to the stepping motor when the amplitude value of the transmission signal is maximum, thereby completing the current frequency locking of the second resonance laser.
2. The method for automatically locking the frequency of an optical frequency atomic clock according to claim 1, further comprising:
and determining the current frequency difference before and after the second resonance laser performs iterative operation, generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, and when the relay circuit is positioned in the set switching parameter, receiving a transmission signal of the resonant cavity by the adjusting circuit, and outputting a preset voltage.
3. The method for automatically locking the frequency of an optical frequency atomic clock according to claim 1, further comprising:
and judging whether the interference pattern of the first resonant laser and the second resonant laser is correct.
4. The method of claim 3, wherein determining whether the interference patterns of the first resonant laser and the second resonant laser are correct comprises:
acquiring a data sequence of the first resonant laser and the second resonant laser interference pattern at the current moment;
selecting a data sequence within a set threshold range, and calculating to obtain a peak value point in the data sequence;
calculating the difference value between the data sequence of the maximum value in the set threshold range and the data sequence of the peak point;
if the difference is higher than a set value, the interference patterns of the first resonant laser and the second resonant laser are judged to be correct.
5. An optical frequency atomic clock frequency automatic locking system, comprising:
and the laser acquisition module is used for: acquiring a first resonance laser and a second resonance laser;
a first laser adjustment module: adjusting the frequency of the first resonant laser to a first frequency range in which atomic transition occurs in the calcium atom flow;
adjusting the voltage and current of the laser corresponding to the first resonant laser so as to enable the wavelength of the first resonant laser to reach a target wavelength value;
according to the laser saturation spectrum signal, calculating to obtain the peak value of the atomic resonance frequency;
locking the first resonant laser frequency to a peak of the atomic resonance frequency;
and a second laser adjustment module: performing iterative operation, judging whether the current frequency of the second resonant laser is in a second frequency range of atomic transition of calcium atom flow, if not, adjusting a laser corresponding to the second resonant laser, locking the frequency, and then transmitting the laser to a resonant cavity to stabilize the current frequency of the second resonant laser, and repeatedly judging whether the current frequency of the second resonant laser is in the second frequency range of atomic transition of calcium atom flow until the current frequency of the second resonant laser is in the second frequency range of atomic transition of calcium atom flow;
the adjusting the laser corresponding to the second resonance laser, and transmitting the laser to a resonant cavity after frequency locking so as to stabilize the current frequency of the second resonance laser comprises:
adjusting the rotation angle of the stepping motor of the laser corresponding to the second resonance laser with a set stepping value until the amplitude value of the transmission signal of the corresponding laser meets a first set condition, and suspending the rotation of the stepping motor;
adjusting the current of the laser corresponding to the second resonance laser by setting amplification, and recording the amplitude value of the corresponding transmission signal;
rotating the stepper motor when the amplitude value of the transmission signal meets a second set condition;
when the transmission signal amplitude value meets a third set condition, recording the rotation angle of the stepping motor when the transmission signal amplitude value reaches the maximum, and suspending the rotation of the stepping motor;
and adjusting the rotation angle of the stepping motor to the rotation angle corresponding to the stepping motor when the amplitude value of the transmission signal is maximum, thereby completing the current frequency locking of the second resonance laser.
6. The optical frequency atomic clock frequency automatic locking system of claim 5, further comprising:
and the laser offset adjustment module is used for: and determining the current frequency difference before and after the second resonance laser performs iterative operation, generating a set switching parameter of a relay circuit for controlling an adjusting circuit according to the current frequency difference, and when the relay circuit is positioned in the set switching parameter, receiving a transmission signal of the resonant cavity by the adjusting circuit, and outputting a preset voltage.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the optical frequency atomic clock frequency auto-locking method according to any one of claims 1 to 4 when the computer program is executed by the processor.
8. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor realizes the steps of the optical frequency atomic clock frequency automatic locking method according to any one of claims 1 to 4.
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