CN107666107B - Method of correcting laser power, laser, storage medium, and electronic apparatus - Google Patents

Method of correcting laser power, laser, storage medium, and electronic apparatus Download PDF

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CN107666107B
CN107666107B CN201710999297.0A CN201710999297A CN107666107B CN 107666107 B CN107666107 B CN 107666107B CN 201710999297 A CN201710999297 A CN 201710999297A CN 107666107 B CN107666107 B CN 107666107B
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laser
laser power
initial
error coefficient
correction value
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CN107666107A (en
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何高锋
蒋峰
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Maxphotonics Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/04Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042Electrical excitation ; Circuits therefor

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  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

The embodiment of the invention relates to the technical field of lasers, and discloses a method for correcting laser power, a laser, a storage medium and an electronic device. The method for correcting the laser power comprises the following steps: equally dividing the whole change interval of the laser power output by the laser by using N dividing points; acquiring the initial laser power and the corresponding initial working current of each dividing point; driving the laser to work by the initial working current, acquiring the actual laser power output by the laser when working, and calculating an error coefficient between the actual laser power and the initial laser power; and when the error coefficient is not in a preset error coefficient range, calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by using the correction value. The technical scheme disclosed by the embodiment of the invention is beneficial to correcting the laser power output by the laser and improving the precision processing quality of the laser.

Description

Method of correcting laser power, laser, storage medium, and electronic apparatus
Technical Field
The technical scheme disclosed by the embodiment of the invention relates to the technical field of lasers, in particular to a method for correcting laser power, a laser, a storage medium and an electronic device.
Background
At present, the power of various lasers is getting larger and larger, and the lasers are widely applied to the fields of military, medical treatment, industrial manufacturing and the like. When the laser is used for carrying out precision machining on materials, the laser power output by the laser is accurately controlled, so that the precision machining quality is improved.
The inventor finds out in the process of studying the present invention that how to correct the laser power output by the laser in the prior art becomes a technical problem to be solved urgently.
Disclosure of Invention
The technical scheme disclosed by the invention can at least solve the following technical problems: how to correct the laser power of the laser output.
One or more embodiments of the present invention disclose a method of correcting laser power, including: equally dividing the whole change interval of the laser power output by the laser by using N dividing points; acquiring the initial laser power and the corresponding initial working current of each dividing point; driving the laser to work by the initial working current, acquiring the actual laser power output by the laser when working, and calculating an error coefficient between the actual laser power and the initial laser power; and when the error coefficient is not in a preset error coefficient range, calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by using the correction value.
In one or more embodiments of the present invention, an error coefficient between the actual laser power and the initial laser power is calculated according to the formula J ═ W-K ÷ W, where J refers to the error coefficient, W refers to the initial laser power, and K refers to the actual laser power.
In one or more embodiments of the invention, according to formula Incalculating a correction value of the initial operating current (1-muxJ) × I, wherein InRefers to the correction value, μ refers to a coefficient preventing power overshoot, J refers to the error coefficient, and i refers to the initial operating current.
In one or more embodiments of the invention, the predetermined error factor ranges from-0.005 to 0.005.
In one or more embodiments of the invention, 0 < μ < 1.
In one or more embodiments of the present invention, all the initial laser powers are respectively used as theoretical laser powers of a laser, and the initial working currents corresponding to all the initial laser powers are respectively used as theoretical working currents corresponding to the theoretical laser powers; or
And selecting one or more initial laser powers from all the initial laser powers as one or more rated laser powers of the laser, and taking the initial working current corresponding to the selected initial laser power as the rated working current corresponding to the rated laser power.
In one or more embodiments of the invention, the method further comprises: when the laser is driven to work by the correction value, continuously acquiring the actual laser power output by the laser when the laser works, and calculating an error coefficient between the actual laser power and the initial laser power; and when the error coefficient belongs to a preset error coefficient range, storing the correction value.
In one or more embodiments of the invention, the method further comprises: and when the laser works, the stored correction value of the initial working current is called, and the laser is driven to work by the correction value.
In one or more embodiments of the invention, the method further comprises: before correcting the laser power, acquiring a change curve between the laser power output by the laser and the working current; the laser power is zero to the maximum laser power output by the laser device as the whole change interval; and acquiring corresponding initial working current according to the change curve and the initial laser power of each dividing point.
One or more embodiments of the present invention also disclose a laser, including: the laser power measuring device comprises an optical path module, a driving and controlling circuit, a laser power measuring device and an electronic device, wherein the driving and controlling circuit is connected with the optical path module in a circuit form, the laser power measuring device is connected with the driving and controlling circuit and the laser power measuring device in a circuit form or a communication form, at least one pumping source is arranged in the optical path module, the driving and controlling circuit is used for driving the pumping source to generate laser and controlling the laser power output by the pumping source, and the laser power measuring device is used for measuring the actual laser power output by a laser. The laser is used for realizing any one of the above methods for correcting the laser power.
One or more embodiments of the present invention also disclose a non-transitory computer readable storage medium having stored thereon computer instructions adapted to be loaded by a processor to implement any of the above methods of correcting laser power.
An electronic device for correcting laser power, comprising: at least one processor, at least one memory, at least one input device, and at least one output device. The electronic device is used for realizing any one of the above methods for correcting the laser power.
Compared with the prior art, the technical scheme disclosed by the invention mainly has the following beneficial effects:
in the embodiment of the invention, because the whole change interval of the laser power output by the laser is equally divided, when the laser works, the corresponding initial working current can be determined according to the initial laser power of each division point, and the laser is driven to work by the initial working current, so that the actual laser power output by the laser is closer to the initial laser power. Taking the actual laser power output by the laser as the ordinate and the initial working current as the abscissa, the relationship between the actual laser power output by the laser and the initial working current is approximately a straight line with a slope of 1. And when the error coefficient is not in a preset error coefficient range, calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by the correction value. Therefore, the method for correcting the laser power can further correct the actual laser power output by the laser, so that the error coefficient between the actual laser power output by the laser and the initial laser power is within the preset error coefficient range, and the method is favorable for improving the precision machining quality of the laser.
Drawings
FIG. 1 is a schematic diagram of the relationship between actual laser power and initial laser power under ideal conditions;
FIG. 2 is a diagram illustrating the relationship between the actual laser power and the initial laser power in an actual situation;
FIG. 3 is a diagram illustrating a method for calibrating laser power according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an entire variation interval of laser power output by a laser equally divided by N division points;
FIG. 5 is a flow chart of laser power calibration according to another embodiment of the present invention;
FIG. 6 is a flow chart of laser power calibration according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a laser in accordance with an embodiment of the present invention;
fig. 8 is a schematic view of an electronic device according to an embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
During the laser design process, an initial laser power is determined for the laser based on various design parameters of the laser. In an ideal situation, the actual laser power output by the laser is equal to the initial laser power of the laser. Thus, in an ideal situation, the relationship between the actual laser power and the initial laser power can be represented by a straight line with a slope of 1 in fig. 1. Those skilled in the art will appreciate that there may be some error between the initial laser power of the laser and the actual laser power. As illustrated in fig. 2, in one possible situation, when the initial laser power of the laser is 0, the actual laser power x output by the laser is greater than 0, and when the initial laser power is the maximum power MAX, the actual laser power y is greater than the maximum power MAX, and the relationship between the actual laser power and the initial laser power is not a straight line but a curve. Since many materials processed by using a laser have very high sensitivity to laser power, the laser power output by the laser needs to be corrected, so that the error between the actual laser power output by the laser and the initial power meets the processing requirement.
The technical solution of the present invention is described below with reference to specific embodiments, and the method for correcting laser power in the specific embodiments is only a preferred embodiment, and is not intended to limit the scope of the present invention.
The method for correcting the laser power is applied to the fiber laser, but the method for correcting the laser power disclosed by the invention is not limited to be applied to the fiber laser. Fig. 3 is a schematic diagram illustrating a method for correcting laser power according to an embodiment of the invention. As illustrated in fig. 3, the method of correcting laser power includes:
step 1: the whole change interval of the laser power output by the laser is equally divided by N dividing points.
Step 2: and acquiring the initial laser power of each dividing point and the corresponding initial working current.
And step 3: and driving the laser to work by the initial working current, acquiring the actual laser power output by the laser during working, and calculating an error coefficient between the actual laser power and the initial laser power.
And 4, step 4: and when the error coefficient is not in a preset error coefficient range, calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by using the correction value.
The larger the value of N is, the more small change intervals are obtained after the whole change interval of the laser power output by the laser is equally divided, and the closer the relation between the actual laser power and the initial laser power is to a straight line with the slope of 1.
The whole change interval of the laser power output by the laser is equally divided, so that the corresponding initial working current can be determined according to the initial laser power of each division point when the laser works, and the laser is driven to work by the initial working current, so that the actual laser power output by the laser is closer to the initial laser power. Taking the actual laser power output by the laser as the ordinate and the initial working current as the abscissa, the relationship between the actual laser power output by the laser and the initial working current is approximately a straight line with a slope of 1. And when the error coefficient is not in a preset error coefficient range, calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by the correction value. Therefore, the method for correcting the laser power can further correct the actual laser power output by the laser, so that the error coefficient between the actual laser power output by the laser and the initial laser power is within the preset error coefficient range, and the method is favorable for improving the precision machining quality of the laser.
In one possible embodiment, a curve of the change between the laser power of the laser output and the operating current is obtained before the laser power is corrected. And taking the laser power from zero to the maximum laser power output by the laser as the whole change interval. And acquiring corresponding initial working current according to the change curve and the initial laser power of each dividing point. As illustrated in fig. 4, after the entire variation interval of the laser power output from the laser is equally divided by N division points, the difference in the initial laser power between the adjacent division points is equal. Since the initial operating current corresponds to the initial laser power, the initial operating current on the abscissa is not equally divided.
In one possible embodiment, an error factor between the actual laser power and the initial laser power is calculated according to the formula J ═ W-K ÷ W, where J refers to the error factor, W refers to the initial laser power, and K refers to the actual laser power. The preset error coefficient range is-0.005.
In one possible embodiment, according to formula Incalculating a correction value for the initial operating current (1-muxj) × I, where InIs referred to as the correction value, mu is a coefficient preventing power overshoot, 0 < mu < 1, J is the error coefficient, i is the initial valueThe operating current is started.
Based on the method for correcting laser power disclosed in the above embodiment, another embodiment of the present invention further discloses a preferred implementation manner, and the claimed technical solution is explained. Referring to fig. 5, a flow chart of laser power calibration according to another embodiment of the present invention is shown. The method for correcting laser power illustrated in fig. 5 is based on the technical solution disclosed in the above embodiment, and when the laser is driven to operate by the correction value, the actual laser power output when the laser operates is continuously obtained, and an error coefficient between the actual laser power and the initial laser power is calculated. And when the error coefficient belongs to a preset error coefficient range, storing the correction value. That is, if the error coefficient does not fall within the preset error coefficient range, the error coefficient between the actual laser power and the initial laser power when the laser is driven to operate by the correction value is calculated again, and the calculation of the correction value of the initial operating current is stopped only when the error coefficient falls within the preset error coefficient range.
The method of correcting laser power illustrated in fig. 5 includes:
step a 1: the whole change interval of the laser power output by the laser is equally divided by N dividing points.
Step a 2: and acquiring the initial laser power and the corresponding initial working current of the nth division point.
Step a 3: and driving the laser to work by the initial working current, acquiring the actual laser power output by the laser during working, and calculating an error coefficient between the actual laser power and the initial laser power.
Step a 4: and judging whether the error coefficient is within a preset error coefficient range. When the error coefficient is not within the preset error coefficient range, executing the step a 5: and calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by the correction value. When the error coefficient is within a preset error coefficient range, executing the step bl: storing the operating current. Then step b2 is performed: the correction is ended.
After the step a5 is executed, the step a6 is executed: and judging whether the error coefficient is within a preset error coefficient range. When the error coefficient is not within the preset error coefficient range, executing step c 1: and acquiring the actual laser power output by the laser during working, and calculating an error coefficient between the actual laser power and the initial laser power. And c1 is executed, and the step a5 is executed. When the error coefficient is within the preset error coefficient range, executing step d 1: the correction value is stored. Step d2 is then performed: and judging whether the initial laser power of all the dividing points is corrected. When the initial laser power correction of all the division points is completed, step e1 is performed: the correction is ended. When the initial laser power of the division point is not corrected, the step a2 is executed.
The method of correcting laser power illustrated in fig. 5 is a specific application to the method of correcting laser power illustrated in fig. 3. Other execution forms of the steps illustrated in fig. 5 exist, and if the execution form of the steps is changed without substantial improvement on the technical solution disclosed by the present invention, the steps still belong to the protection scope of the present application.
It will be appreciated by those skilled in the art that the theoretical laser power of a laser is typically obtained by calculation, and the influence of the construction and mounting accuracy of the laser itself on the laser power is not considered. It would be advantageous to facilitate the use of a laser if the theoretical laser power of the laser could be corrected. For example, a device with a laser as a component may be designed using the corrected theoretical laser power as a design parameter. In one possible embodiment, therefore, all the initial laser powers are respectively set as theoretical laser powers of the laser, and the initial operating currents corresponding to all the initial laser powers are respectively set as theoretical operating currents corresponding to the theoretical laser powers.
Based on the method for correcting laser power disclosed in the above embodiment, another embodiment of the present invention further discloses a preferred implementation manner, and the claimed technical solution is explained. Referring to fig. 6, a flowchart of a method for calibrating laser power according to another embodiment of the present invention is shown. As can be seen from the above embodiments, the correction value of the initial operating current is stored after the actual laser power output by the laser is corrected. When the laser works, the correction value of the initial working current can be directly called to drive the laser to work. Therefore, when the laser is operated, the stored correction value of the initial operation current is called, and the laser is driven to operate by the correction value. When the laser works, the stored correction value of the initial working current is called, the laser is driven to work by the initial working current, the actual laser power output by the laser when working is obtained, and an error coefficient between the actual laser power and the initial laser power is calculated; and when the error coefficient belongs to a preset error coefficient range, storing the correction value and driving the laser to work by using the correction value.
The method of correcting laser power illustrated in fig. 6 includes: step A1: it is determined whether the stored correction value for the initial operating current is to be invoked. When the laser does not recall the stored correction value of the initial operating current when operating, step B1 is executed: and driving the laser to work by the initial working current, acquiring the actual laser power output by the laser during working, and calculating an error coefficient between the actual laser power and the initial laser power. Step B2 is then performed: and calculating a correction value of the initial working current according to the error coefficient and the initial working current, and driving the laser to work by the correction value. Step B3 is then performed: and judging whether the error coefficient is within a preset error coefficient range. When the error coefficient is not within the preset error coefficient range, executing step D1: and acquiring the actual laser power output by the laser during working, and calculating an error coefficient between the actual laser power and the initial laser power. And after the step D1 is executed, returning to execute the step B2. When the error coefficient is within the preset error coefficient range, executing step E1: the correction value is stored. When the stored correction value of the initial operating current is called when the laser is operated, the step C1 is executed: and driving the laser to work by the correction value.
The method of correcting laser power illustrated in fig. 6 is a specific application to the method of correcting laser power illustrated in fig. 3. Other execution forms of the steps illustrated in fig. 6 exist, and if the execution form of the steps is changed without substantial improvement on the technical solution disclosed by the present invention, the steps still belong to the protection scope of the present application.
Those skilled in the art will appreciate that lasers typically operate only at one or more nominal laser powers. Therefore, in one possible embodiment, one or more initial laser powers are selected from all the initial laser powers as one or more rated laser powers of the laser, and an initial operating current corresponding to the selected initial laser power is taken as a rated operating current corresponding to the rated laser power. In addition, one or more rated laser powers of the laser operation may also be temporarily determined during the operation of the laser, the temporarily determined rated laser power may be equal to the initial laser power, and the actual laser power output by the laser may be corrected according to the method for correcting laser power illustrated in fig. 6, so that the error coefficient between the actual laser power output by the laser and the rated laser power is within the preset error coefficient range.
Referring to fig. 7, an embodiment of the present invention discloses a laser including: the laser power measuring device comprises an optical path module 101, a driving and control circuit 102 connected with the optical path module 101 in a circuit form, a laser power measuring device 103, and an electronic device 104 connected with the driving and control circuit 102 and the laser power measuring device 103 in a circuit form or a communication form, wherein at least one pump source is arranged in the optical path module 101, the driving and control circuit 102 is used for driving the pump source to generate laser and controlling laser power output by the pump source, and the laser power measuring device 103 is used for measuring actual laser power output by a laser. The laser is used for realizing any one of the above methods for correcting the laser power.
An embodiment of the present invention discloses a non-transitory computer readable storage medium, having stored therein computer instructions, which are suitable for being loaded by a processor, to implement any one of the above methods for correcting laser power.
Referring to fig. 8, an embodiment of the present invention discloses an electronic device for correcting laser power, including: at least one processor 201, at least one memory 202, at least one input device 203, and at least one output device 204. The processor 201, the memory 202, the input device 203 and the output device 204 are connected by a bus. The electronic device is used for realizing any one of the above methods for correcting the laser power.
When the techniques in the various embodiments described above are implemented using software, the computer instructions and/or data to implement the various embodiments described above may be stored on a computer-readable medium or transmitted as one or more instructions or code on a readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that a computer can store. Taking this as an example but not limiting: computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Further, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (8)

1. A method of correcting laser power, the method being applied to a fiber laser, comprising:
equally dividing the whole change interval of the laser power output by the laser by using N dividing points;
acquiring the initial laser power and the corresponding initial working current of each dividing point;
driving the laser to work by the initial working current, acquiring the actual laser power output by the laser when working, and calculating an error coefficient between the actual laser power and the initial laser power;
judging whether the error coefficient is within a preset error coefficient range or not;
when the error coefficient is within a preset error coefficient range, storing the working current, and then finishing correction;
or when the error coefficient is not in the preset error coefficient range, calculating the correction value of the initial working current according to the error coefficient and the initial working current, driving the laser to work by the correction value, continuously acquiring the actual laser power output by the laser when working, calculating the error coefficient between the actual laser power and the initial laser power again, judging whether the error coefficient is within the preset error coefficient range again, if not, based on the recalculated error factor and the initial operating current, the correction value is again retrieved based on the calculating the correction value step described above, driving the laser to work by the obtained correction value again, calculating an error coefficient between the actual laser power and the initial laser power when the laser is driven to work by the correction value again, and repeating the operation until the finally calculated error coefficient is within a preset error coefficient range;
when the error coefficient is within a preset error coefficient range, storing the correction value, and then judging whether the initial laser functions of all the segmentation points are corrected; finishing correction when the initial laser power correction of all the segmentation points is finished; when the initial laser power of the division points is not corrected, returning to execute the step of obtaining the initial laser power of each division point and the corresponding initial working current until the correction is finished;
wherein an error coefficient between the actual laser power and the initial laser power is calculated according to the formula J ═ W-K ÷ W, according to the formula Incalculating a correction value of the initial working current (1-muXJ) x I, wherein J refers to the error coefficient, W refers to the initial laser power, K refers to the actual laser power, and I refers to the actual laser powernRefers to the correction value, μ refers to a coefficient preventing power overshoot, J refers to the error coefficient, and i refers to the initial operating current.
2. The method for correcting laser power according to claim 1, wherein all initial laser powers are respectively used as theoretical laser powers of the laser, and initial working currents corresponding to all the initial laser powers are respectively used as theoretical working currents corresponding to the theoretical laser powers; or
And selecting one or more initial laser powers from all the initial laser powers as one or more rated laser powers of the laser, and taking the initial working current corresponding to the selected initial laser power as the rated working current corresponding to the rated laser power.
3. The method of correcting laser power of claim 1, further comprising: and when the laser works, the stored correction value of the initial working current is called, and the laser is driven to work by the correction value.
4. The method for correcting laser power according to claim 3, wherein the correction value of the initial operating current that is not stored is called when the laser operates, the laser is driven to operate by the initial operating current, the actual laser power output when the laser operates is obtained, and an error coefficient between the actual laser power and the initial laser power is calculated; and when the error coefficient belongs to a preset error coefficient range, storing the correction value and driving the laser to work by using the correction value.
5. The method of correcting laser power of claim 1, further comprising: before correcting the laser power, acquiring a change curve between the laser power output by the laser and the working current; the laser power is zero to the maximum laser power output by the laser device as the whole change interval; and acquiring corresponding initial working current according to the change curve and the initial laser power of each dividing point.
6. A laser, comprising: the laser power measuring device comprises an optical path module, a driving and controlling circuit connected with the optical path module in a circuit form, a laser power measuring device and an electronic device connected with the driving and controlling circuit and the laser power measuring device in a circuit form or a communication form; the optical path module is provided with at least one pumping source, the driving and control circuit is used for driving the pumping source to generate laser and controlling the laser power output by the pumping source, the laser power measuring device is used for measuring the actual laser power output by the laser, and the laser is used for realizing the method for correcting the laser power according to any one of claims 1 to 5.
7. A non-transitory computer readable storage medium having stored therein computer instructions adapted to be loaded by a processor to implement the method of correcting laser power of any one of claims 1 to 5.
8. An electronic device for correcting laser power, comprising: at least one processor, at least one memory, at least one input device, and at least one output device, the electronic device being configured to implement the method of correcting laser power of any of claims 1 to 5.
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