CN115939921A - Laser frequency locking method and system based on digital PID - Google Patents
Laser frequency locking method and system based on digital PID Download PDFInfo
- Publication number
- CN115939921A CN115939921A CN202211637596.7A CN202211637596A CN115939921A CN 115939921 A CN115939921 A CN 115939921A CN 202211637596 A CN202211637596 A CN 202211637596A CN 115939921 A CN115939921 A CN 115939921A
- Authority
- CN
- China
- Prior art keywords
- laser
- voltage control
- pid
- control quantity
- frequency
- 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.)
- Pending
Links
Images
Landscapes
- Lasers (AREA)
Abstract
The application discloses laser frequency locking method and system based on digital PID, and the laser frequency locking method and system based on digital PID comprise an optical system device, a data acquisition device, a data processing device and a feedback control device, wherein the optical system device is used for emitting laser, the data acquisition device is used for measuring and recording an actual value of laser frequency, the data processing device is used for calculating a digital signal of a voltage control quantity by utilizing a PID function, and the feedback control device is used for converting the digital signal of the voltage control quantity into an analog signal and outputting the analog signal to a laser in the optical system device to realize frequency locking of the laser. The scheme has the advantages of simple structure, easy realization, convenient adjustment, modularization, wide application range and strong replaceability; the reference value of frequency locking has strong flexibility, and the locked laser frequency has high stability and strong robustness; can be widely applied to the fields of atomic physics, spectral measurement and analysis, quantum precision measurement, laser systems and the like.
Description
Technical Field
The application relates to the technical field of laser, in particular to a laser frequency locking method and system based on digital PID.
Background
In the free running process of the laser, the frequency drift of the output laser is large. Under laboratory conditions with good temperature and humidity stability, the frequency drift of the laser within hours can usually reach hundreds of megahertz. In the related fields of atomic physics, quantum precision measurement and the like, in order to avoid the influence of frequency drift of a laser on experiments and measurement, the laser frequency is often required to be locked. In the field of quantum precision measurement, the currently adopted laser frequency locking method and system often lock the laser frequency at a stable frequency value of a reference system, such as an ultrastable cavity or an atomic transition resonance spectral line, to obtain laser with narrow line width and high frequency stability, but the laser frequency locking point is limited by inherent characteristics (physical structure and atomic energy level) of the reference system, and the system has a complex structure, high debugging and locking difficulty, poor system robustness, is not beneficial to miniaturization and modularization, and is expensive in manufacturing cost and high in maintenance cost.
Disclosure of Invention
The invention provides a laser frequency locking system and method based on digital PID, which solves the problems of complex system structure, high debugging and locking difficulty, poor system robustness, inconvenience for miniaturization and modularization, high manufacturing cost and high maintenance cost, and can meet the laser frequency locking requirements in the fields of atomic physics, quantum precision measurement and the like.
The embodiment of the application provides a laser frequency locking system based on digital PID, which comprises an optical system device, a data acquisition device, a data processing device and a feedback control device,
the optical system device comprises a laser, a data acquisition device and a data processing device, wherein the laser is used for generating laser and transmitting the laser to the data acquisition device;
the data acquisition device is used for measuring and recording the actual value of the laser frequency and sending the actual value to the data processing device;
the data processing device is used for receiving the laser frequency actual value, calculating according to the target reference frequency value and the laser frequency actual value to obtain a frequency error value, and calculating according to the frequency error value by utilizing a PID function to obtain a digital signal of a voltage control quantity;
the feedback control device is used for receiving the digital signal of the voltage control quantity, converting the digital signal of the voltage control quantity into an analog signal and outputting the analog signal to the laser in the optical system device to realize the frequency locking of the laser.
Preferably, the optical system device includes a laser, an optical isolator, a split optical path, and a coupling optical path.
Preferably, the optical system device comprises a laser, a 1/2 wave plate, a spectroscope and an optical fiber collimator, laser emitted by the laser is divided into two beams after passing through the 1/2 wave plate and the spectroscope, and reflected light is coupled into an optical fiber through the optical fiber collimator and is sent to the data acquisition device.
Preferably, the data acquisition device comprises a wavemeter for measuring the actual value of the laser frequency in real time and a dynamic Data Acquisition (DAQ) module for converting the actual value of the laser frequency into a digital signal.
Preferably, the data processing system is upper computer software with a PID digital function.
Preferably, the feedback control means is an analog signal output (AO).
The invention also provides a laser frequency locking method based on digital PID, which is applied to any one of the devices and comprises the following steps:
initializing parameters, setting a target reference frequency value, setting a voltage offset, and setting a maximum threshold and a minimum threshold of a PID voltage control quantity according to a voltage input range of an input end of a laser feedback control device;
data acquisition, measuring and recording the actual value of the laser frequency;
data processing, namely converting the laser frequency actual value into a digital signal, calculating according to a target reference frequency value and the laser frequency actual value to obtain a frequency error value (e (k)), and calculating by utilizing a PID (proportion integration differentiation) function to obtain a voltage control quantity;
and feedback control, converting the voltage control quantity into a digital signal, and feeding the digital signal back to the input end of the laser to realize laser frequency locking.
Preferably, in the step of calculating the voltage control amount using the PID function, the method further includes the steps of:
setting PID parameters including proportional parameter K p Integral parameter K i And a differential parameter K d ；
And calculating the kth PID voltage control quantity u (k) to meet the conditional formula (1) according to the PID parameter and the frequency error value e (k).
And (3) carrying out threshold protection judgment on the PID voltage control quantity: if the PID voltage control quantity is greater than the maximum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the maximum threshold value of the PID voltage control quantity, if the PID voltage control quantity is less than the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity, and if the PID voltage control quantity is between the maximum threshold value and the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity;
the output voltage control quantity is the sum of the initial voltage control quantity and the voltage offset quantity.
Preferably, in the step of calculating the voltage control amount using the PID function, the method further includes the steps of:
calculating a frequency error value according to the laser frequency actual value and the target reference frequency value by using a subtracter;
calculating to obtain PID voltage control quantity by using a digital PID algorithm according to the frequency error value;
after threshold protection judgment is carried out on the PID voltage control quantity by utilizing a comparator and an AND gate logic device, an initial voltage control quantity is obtained;
and calculating the sum of the initial voltage control quantity and the voltage offset quantity by using an adder to obtain the voltage control quantity.
Preferably, the voltage control amount is fed back to the current of the laser or the PZT voltage.
The device and the method provided by the invention can produce the following beneficial effects:
the device has the advantages of simple structure, easy realization, convenient adjustment, modularization, wide application range and strong replaceability; the reference value of frequency locking has strong flexibility, and the locked laser frequency has high stability and strong robustness; the method has wide application range and is widely applied to the fields of atomic physics, spectral measurement and analysis, quantum precision measurement, laser systems and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a block diagram of a laser frequency locking system based on digital PID;
FIG. 2 is a block diagram of another digital PID-based laser frequency locking system;
FIG. 3 is a flow chart of a digital PID based laser frequency locking method;
fig. 4 is a flow chart of another digital PID-based laser frequency locking method.
Reference numerals are as follows: 1. a laser; 2. an optical isolator; 3. 1/2 wave plate; 4. a Polarizing Beam Splitter (PBS); 5. a reflector; 6. a fiber collimator; 7. a wavelength meter; 8. a dynamic data acquisition Device (DAQ); 9. an analog signal output device; 10. a digital PID.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a structural block diagram of a laser frequency locking system based on digital PID, and as shown in fig. 1, the laser frequency locking system based on digital PID provided by the present application includes an optical system device, a data acquisition device, a data processing device and a feedback control device;
in this embodiment, the optical system device emits two laser beams, one of which is used for controlling feedback, and may be a modulated laser or a semiconductor laser; the data acquisition device selects a device capable of measuring the laser frequency, for example, a wavemeter is selected for laser frequency acquisition, so that the scheme is simpler, more convenient and easier to implement; the data processing device can adopt software to realize the PID function; the feedback control device can be realized by a digital-analog conversion device.
The optical system device comprises a laser, a data acquisition device and a data processing device, wherein the laser is used for generating laser and transmitting the laser to the data acquisition device;
in this embodiment, the laser may be a modulated laser, emits laser, and is divided into two paths through processing by the optical path system, one path enters the experimental system, and the other path is used for feedback control, and the generated control signal reenters the optical system device to achieve the purpose of adjusting the laser emission frequency.
The data acquisition device is used for measuring and recording the actual value of the laser frequency and sending the actual value to the data processing device;
in this embodiment, the data acquisition device performs three operations: one part is to receive laser and measure the laser frequency; the second part is used for converting the measured laser frequency into a digital signal; the third part is to output the laser frequency converted into digital signal to the data processing device for communication.
The data processing device is used for receiving the laser frequency actual value measured by the data acquisition device, calculating a frequency error value (e (k)) according to a target reference frequency value and the laser frequency actual value, and calculating a digital signal of the voltage control quantity by utilizing a PID function according to the frequency error value;
in this embodiment, the data processing device receives the laser frequency actual value sent by the data acquisition device, the laser frequency actual value is subtracted from the target frequency reference value to obtain a frequency error value, and then the digital signal of the voltage control quantity is obtained through multiple calculations, each calculation-feedback will make the laser frequency actual value closer to the target frequency reference value, and as the calculation times are more, the obtained laser frequency actual value is more stable, and the locking of the laser frequency is realized.
The feedback control device is used for receiving the digital signal of the voltage control quantity, converting the digital signal of the voltage control quantity into an analog signal and outputting the analog signal to the laser in the optical system device to realize the frequency locking of the laser.
In this embodiment, the feedback control device converts the output control signal from a digital signal to an analog voltage signal, that is, an analog signal of a voltage control amount is fed back to the laser device, so as to realize frequency locking of the laser device.
As an embodiment of the application, the optical system device comprises a laser, an optical isolator, a beam splitting optical path and a coupling optical path.
In this embodiment, the optical system device realizes beam splitting of a laser light path by building a light path, and at least includes four parts, namely a laser, an optical isolator, a beam splitting light path and a coupling light path.
Fig. 2 is a block diagram of another structure of a laser frequency locking system based on digital PID, as shown in fig. 2, as an embodiment of the present application, the optical system device includes a laser, a 1/2 wave plate, a beam splitter and an optical fiber collimator, laser emitted from the laser is divided into two beams after passing through the 1/2 wave plate and the beam splitter, and reflected light is coupled into an optical fiber through the optical fiber collimator and is sent to the data acquisition device.
In the embodiment, the laser passes through the optical isolator after light is emitted, so that the influence caused by the fact that reflected light in a subsequent light path returns to the laser is avoided; the 1/2 wave plate and the spectroscope are used for splitting, the splitting ratio of the reflected light and the transmitted light is changed by adjusting the 1/2 wave plate, a laser beam (transmitted light) with larger light power is used as a main output laser for experimental operation, and a laser beam (reflected light) with smaller light power is coupled into an optical fiber in a coupling light path through the adjusting reflector and the optical fiber collimator and is input into the data acquisition device. Wherein the beam splitter can be a polarizing beam splitter Prism (PBS).
As an embodiment of the present application, the data acquisition device comprises a wavemeter for measuring an actual value of a laser frequency in real time and a dynamic Data Acquisition (DAQ) module for converting the actual value of the laser frequency into a digital signal.
In this embodiment, the data acquisition device completes the function of measuring the laser frequency through the wavelength meter, and at this time, the actual value of the laser frequency acquired by the wavelength meter is converted into a digital signal, and then the dynamic data acquisition module is used for acquiring in real time and forwarding the digital signal of the actual value of the laser frequency to the data processing device.
The data acquisition device mainly comprises a wavelength meter and a dynamic Data Acquisition (DAQ) module. The calibrated wavemeter is used for measuring the laser frequency in real time and converting the frequency signal into a digital signal. The DAQ module collects digital signals representing laser frequency in real time and communicates with the data processing device.
As an embodiment of the application, the data processing system is upper computer software with PID digital function.
In this embodiment, the functions of error calculation, PID control, threshold protection, dc offset are integrated using software algorithms and connected to a feedback control system. The upper computer is flexible and easy to use, has high-speed data processing capacity and a visual function, can flexibly and conveniently realize specific functions, shortens the development period and reduces the development cost.
As an embodiment of the present application, the feedback control means is an analog signal output (AO).
In the embodiment, the analog signal output unit (AO) can output standard analog signal quantity to the outside, and complete the conversion of the voltage control quantity from a digital signal to an analog signal.
The feedback control device is an analog signal output device (AO), converts the voltage control quantity from a digital signal into an analog voltage signal, and is connected with the laser for feedback to realize the locking of the laser frequency.
Fig. 3 is a flow chart of steps of a laser frequency locking method based on digital PID, which includes the following steps:
as an embodiment of the present application, in step 101, three initial amounts need to be set first: the expected laser frequency value is a target reference frequency value; the adjustable voltage offset quantity is used for adjusting the input of the laser on the basis of the voltage offset quantity so as to influence the frequency of the laser emitted by the laser; the maximum threshold and the minimum threshold of the PID voltage control quantity adjust the voltage signal exceeding the input range, and the laser is ensured not to be damaged.
Setting a target reference frequency value f for laser locking 0 (ii) a Setting a bias voltage V according to the input voltage range of the laser feedback control port off (ii) a In order to ensure that the laser frequency can be adjusted positively and negatively, and the adjustment range is as large as possible, the intermediate value of the feedback input voltage allowed by the laser is generally taken as a set value. According to V off Setting a threshold value V of the control quantity u (k) max And V min Guarantee [ V ] off +V min ，V off +V max ]In the allowable input voltage range of the laser feedback control port, the damage to the laser is avoided.
102, acquiring data, measuring and recording an actual value of laser frequency;
in this embodiment, in step 102, the actually output laser frequency value is collected to provide a data base for calculating the error value in the subsequent step.
After the PID control function is started, the data acquisition system measures and acquires a laser frequency value f (k), converts the analog signal into a digital signal and inputs the digital signal to an upper computer.
103, processing data, namely converting the laser frequency actual value into a digital signal, calculating a frequency error value e (k) according to the target reference frequency value and the laser frequency actual value, and calculating by utilizing a PID function to obtain a voltage control quantity;
in this embodiment, in step 103, the data processing is to use the known target reference frequency value, the voltage offset, and the laser frequency actual value, and calculate a frequency error value (e (k)) according to the target reference frequency value and the laser frequency actual value, and then calculate a voltage control quantity according to the frequency error value by using the digital PID function.
Namely, the upper computer control software is used for programming to calculate the frequency error value e (k) = f 0 -f (k); and calculating the voltage control quantity according to the frequency error value.
And 104, performing feedback control, namely converting the voltage control quantity into a digital signal, and feeding the digital signal back to the input end of the laser to realize laser frequency locking.
In this embodiment, the output voltage control signal in step 104 is converted into an analog signal, which is fed back to the laser to modulate the laser frequency, thereby achieving frequency locking.
In the laser frequency locking process, the steps of data processing and feedback control are repeated, the optimization parameters are adjusted, and the laser frequency is adjusted for multiple times until the laser frequency is stabilized at the reference frequency value.
As an embodiment of the present application, the step of calculating the voltage control amount by using the PID function further includes the steps of: setting PID parameters including proportional parameter K p Integral parameter K i And a differential parameter K d ；
Setting PID parameter K in upper computer control software p 、K i 、K d The PID parameter is adjustable in the subsequent voltage control quantity adjusting process and can be adjusted according to the last laser frequency error conditionAnd adjusting for multiple times until the actual value of the laser frequency is stabilized near the target reference frequency value.
Calculating the voltage control quantity u (k) of the k-th PID according to the PID parameter and the frequency error value, wherein the voltage control quantity u (k) of the k-th PID meets a conditional formula:
in this embodiment, a primary PID voltage control amount is obtained according to the above formula based on the PID parameter and the frequency error value, and the multiple voltage control amounts obtained by multiple calculations are fed back to the laser, so that the frequency of the laser reaches a stable state and is closer to the target reference frequency value.
And (3) carrying out threshold protection judgment on the PID voltage control quantity: if the PID voltage control quantity is greater than the maximum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the maximum threshold value of the PID voltage control quantity, if the PID voltage control quantity is less than the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity, and if the PID voltage control quantity is between the maximum threshold value and the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity;
in this embodiment, the threshold protection determination is performed on the PID voltage control amount, so that the finally output voltage control amount does not damage the laser.
The upper computer program carries out threshold protection judgment on the control quantity u (k):
if u (k)>V max Then output the initial voltage control quantity V of the signal o ＝V max ；
If u (k)<V min Then output signal V o ＝V min ；
If V min ≤u(k)≤V max Then output signal V o ＝u(k)；
The output voltage control quantity is the sum of the initial voltage control quantity and the voltage offset quantity.
In this embodimentFinal control voltage quantity = initial control voltage quantity V o + bias voltage V off 。
Upper computer program pair output signal V o Increasing DC bias V off To obtain an output control voltage signal V c ＝V off +V o 。
As another embodiment of the present application, the present invention provides a laser frequency locking method, in the step of calculating the voltage control amount by using a PID function, further comprising the steps of:
calculating a frequency error value according to the laser frequency actual value and the target reference frequency value by using a subtracter; calculating to obtain PID voltage control quantity by using a digital PID algorithm according to the frequency error value; after threshold protection judgment is carried out on the PID voltage control quantity by utilizing a comparator and an AND gate logic device, initial voltage control quantity is obtained; and calculating the sum of the initial voltage control quantity and the voltage offset quantity by using an adder to obtain the voltage control quantity.
In the embodiment, the calculation of the voltage control quantity is realized by using a software algorithm, and firstly, an error signal between an actual value of the laser frequency and a target reference frequency value is calculated by using a subtracter; then, inputting the error signal into a digital PID algorithm, and calculating to obtain PID voltage control quantity; secondly, after threshold protection judgment is carried out on the PID voltage control quantity by utilizing a comparator and an AND gate logic device, the initial voltage control quantity is obtained; and finally, increasing the offset voltage amount to the output initial voltage control amount through an adder to obtain and output the voltage control amount.
As an embodiment of the present application, the voltage control amount is fed back to the current of the laser or the PZT voltage.
In this embodiment, a modulated laser may be used, and the frequency of the laser emitted by the laser is directly affected by the change of the current of the laser or the PZT voltage, so that the voltage control output by the feedback control device is fed back to the current of the laser or the PZT voltage, thereby achieving laser frequency locking.
In the laser frequency locking process, the steps of data acquisition, data processing and feedback control are repeated, and the PID parameters are adjusted and optimized until the laser frequency is stabilized at the reference frequency value.
Fig. 4 is a flowchart of another digital PID-based laser frequency locking method, which includes the following steps as an embodiment of the present application:
In the laser frequency locking process, the steps 402 to 406 are repeated, and the PID parameters are adjusted and optimized until the laser frequency is stabilized at the reference frequency value.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A laser frequency locking system based on digital PID comprises an optical system device, a data acquisition device, a data processing device and a feedback control device,
the optical system device comprises a laser, a data acquisition device and a data processing device, wherein the laser is used for generating laser and transmitting the laser to the data acquisition device;
the data acquisition device is used for measuring and recording the actual value of the laser frequency and sending the actual value to the data processing device;
the data processing device is used for receiving the laser frequency actual value, calculating according to the target reference frequency value and the laser frequency actual value to obtain a frequency error value, and calculating according to the frequency error value by utilizing a PID function to obtain a digital signal of a voltage control quantity;
the feedback control device is used for receiving the digital signal of the voltage control quantity, converting the digital signal of the voltage control quantity into an analog signal and outputting the analog signal to the laser in the optical system device to realize the frequency locking of the laser.
2. The laser frequency locking system of claim 1, wherein said optical system means comprises a laser, an optical isolator, a split beam path and a coupled beam path.
3. The laser frequency locking system of claim 1, wherein the optical system device comprises a laser, a 1/2 wave plate, a beam splitter and a fiber collimator, wherein laser emitted from the laser is split into two beams after passing through the 1/2 wave plate and the beam splitter, and reflected light is coupled into an optical fiber through the fiber collimator and is transmitted to the data acquisition device.
4. The laser frequency locking system of claim 1, wherein the data acquisition device comprises a wavemeter for measuring the actual value of the laser frequency in real time and a dynamic data acquisition module for converting the actual value of the laser frequency into a digital signal.
5. The laser frequency locking system of claim 1, wherein the data processing system is a host computer software with PID digital functionality.
6. The laser frequency locking system of claim 1, wherein the feedback control device is an analog signal output.
7. A laser frequency locking method based on digital PID, applied to any one of the devices in claims 1-5, characterized by comprising the steps of:
initializing parameters, setting a target reference frequency value, setting a voltage offset, and setting a maximum threshold and a minimum threshold of a PID voltage control quantity according to a voltage input range of an input end of a laser feedback control device;
data acquisition, measuring and recording the actual value of the laser frequency;
data processing, namely converting the laser frequency actual value into a digital signal, calculating according to a target reference frequency value and the laser frequency actual value to obtain a frequency error value, and calculating by utilizing a PID (proportion integration differentiation) function to obtain a voltage control quantity;
and feedback control, converting the voltage control quantity into a digital signal, and feeding the digital signal back to the input end of the laser to realize laser frequency locking.
8. The laser frequency locking method according to claim 7, wherein in the step of calculating the voltage control amount using a PID function, further comprising the steps of:
setting PID parameters including proportional parameter K p Integral parameter K i And a differential parameter K d ；
Calculating the k-th PID voltage control quantity u (k) according to the PID parameter and the frequency error value e (k) and meeting the condition:
and (3) carrying out threshold protection judgment on the PID voltage control quantity: if the PID voltage control quantity is greater than the maximum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the maximum threshold value of the PID voltage control quantity, if the PID voltage control quantity is less than the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity, and if the PID voltage control quantity is between the maximum threshold value and the minimum threshold value of the PID voltage control quantity, outputting the initial voltage control quantity as the minimum threshold value of the PID voltage control quantity;
the output voltage control quantity is the sum of the initial voltage control quantity and the voltage offset quantity.
9. The laser frequency locking method according to claim 7, wherein in the step of calculating the voltage control amount using a PID function, further comprising the steps of:
calculating a frequency error value according to the laser frequency actual value and the target reference frequency value by using a subtracter;
calculating to obtain PID voltage control quantity by using a digital PID algorithm according to the frequency error value;
after threshold protection judgment is carried out on the PID voltage control quantity by utilizing a comparator and an AND gate logic device, initial voltage control quantity is obtained;
and calculating the sum of the initial voltage control quantity and the voltage offset quantity by using an adder to obtain the voltage control quantity.
10. The laser frequency locking method of claim 7, wherein the voltage control is fed back to a current of the laser or a PZT voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637596.7A CN115939921A (en) | 2022-12-16 | 2022-12-16 | Laser frequency locking method and system based on digital PID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637596.7A CN115939921A (en) | 2022-12-16 | 2022-12-16 | Laser frequency locking method and system based on digital PID |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115939921A true CN115939921A (en) | 2023-04-07 |
Family
ID=86697610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211637596.7A Pending CN115939921A (en) | 2022-12-16 | 2022-12-16 | Laser frequency locking method and system based on digital PID |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115939921A (en) |
-
2022
- 2022-12-16 CN CN202211637596.7A patent/CN115939921A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102629731B (en) | Control method for simultaneously stabilizing laser wavelength and power and control device thereof | |
| CN107302180B (en) | Judge automatically and set the control method of laser frequency and power | |
| CN105867497B (en) | A kind of MZ modulators bias voltage self-adaptation control method | |
| WO2021227265A1 (en) | Device and method for measuring absolute distance by variable synthetic wavelength locked to dynamic sideband | |
| CN107437722A (en) | A kind of modulation free frequency stabilization method and apparatus of semiconductor laser | |
| CN113451882B (en) | Laser frequency stabilization method and system | |
| CN113206434B (en) | Pre-compensation feedback control system and method for frequency difference locking of fiber laser | |
| CN108471045B (en) | Laser constant power digital control method and system | |
| CN104953459B (en) | A kind of transmission cavity frequency stabilization system that laser frequency is steady in a long-term and its frequency-stabilizing method | |
| US20030227629A1 (en) | Laser spectroscopy using a master/slave architecture | |
| CN102440762B (en) | Method and system for stabilizing frequency by interference phase parameter calibration feedback regulation and control | |
| CN110207822B (en) | High-sensitivity optical time delay estimation system, method and medium | |
| CN115102032A (en) | FPGA laser automatic frequency stabilization system based on atomic absorption spectrum and method thereof | |
| CN115939921A (en) | Laser frequency locking method and system based on digital PID | |
| CN110926327B (en) | Matching debugging method and device of OCT optical link, controller and medium | |
| WO2016169007A1 (en) | Wavelength lock, and wavelength locking method and apparatus | |
| CN117318833A (en) | Dual-wavelength polarization feedback method for TF-QKD | |
| US20220236179A1 (en) | Gas absorbance spectrum measurement device frequency locking method, and gas absorbance spectrum measurement method | |
| US6778564B2 (en) | Wavelength-variable light source | |
| CN114578547B (en) | Atomic Shu Guangzhong light beam pointing control method and device | |
| WO2021169518A1 (en) | Wavelength meter, method for obtaining parameter of wavelength meter, and method for online calibration | |
| JP4606696B2 (en) | Controller and method for tunable optical filter | |
| JP2004264116A (en) | Optical wave range finder | |
| CN115275772B (en) | TDLAS technology-based specific time laser wavelength control method and device | |
| CN117519406B (en) | Method for quickly modulating power of radio frequency power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |