CN111044141A - Laser peak power testing method and device - Google Patents
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Abstract
The invention provides a method and a device for testing the peak power of a laser, wherein the method comprises the following steps: acquiring a pulse laser signal of a laser; converting the pulse laser signal into a first voltage signal; periodically acquiring a first voltage signal, and calculating an optical power value according to a preset calibration coefficient and the first voltage signal; presetting a calibration coefficient as a parameter representing the corresponding relation between the voltage signal and the optical power value; and comparing the optical power values in the preset time period, and determining the maximum value of the optical power values as the peak power of the laser. When the method is used for calculating the peak power, the first voltage signal is obtained at intervals, and then the optical power values at different moments are calculated according to the first voltage signal.
Description
Technical Field
The invention relates to the field of laser testing, in particular to a method and a device for testing peak power of a laser.
Background
When testing the peak optical power of a pulse or quasi-continuous laser, the average optical power of the laser is generally measured by a thermopile power meter, then the pulse waveform of output light is measured and the pulse width and the repetition frequency are obtained by calculation, the product of the pulse width and the repetition frequency is obtained as the duty ratio, and the peak power is obtained by dividing the average optical power by the duty ratio. According to the measuring method, when the input driving pulse current and the laser signal are ideal square waves, accurate peak power can be calculated, but in an actual situation, the input driving pulse current has rising and falling edges, the consistent current cannot be kept in a flat top area of a waveform, the ideal square waves cannot be presented generally, and the laser signal is not ideal square waves. Therefore, the peak power of the laser can only be roughly obtained by averaging the optical power in the above method. Especially, the current waveform basically presents a triangular wave shape under the short pulse width, the current waveform is likely to have a roll-off waveform at the falling edge under the long pulse width, and the peak power calculated by adopting the scheme cannot obtain the actual peak power under the condition that the actual peak power is only the average peak power of the laser.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the peak power of the laser cannot be accurately calculated, thereby providing a method and a device for testing the peak power of the laser.
The invention provides a method for testing the peak power of a laser, which comprises the following steps: acquiring a pulse laser signal of a laser; converting the pulse laser signal into a first voltage signal; periodically acquiring a first voltage signal, and calculating an optical power value according to a preset calibration coefficient and the first voltage signal; presetting a calibration coefficient as a parameter representing the corresponding relation between the voltage signal and the optical power value; and comparing the optical power values in the preset time period, and determining the maximum value of the optical power values as the peak power of the laser.
Optionally, the preset calibration coefficient is obtained by: obtaining the calibration power of the continuous laser, and converting the optical signal of the continuous laser into a second voltage signal; and calculating a preset calibration coefficient according to the calibration power and the second voltage signal.
Optionally, after the step of periodically obtaining the first voltage signal and calculating the optical power value according to the preset calibration coefficient and the first voltage signal, and before the step of comparing the optical power values in the preset time period, the method further includes: and carrying out noise reduction processing on the optical power value in the preset time period.
Optionally, the method for testing the peak power of the laser further includes: and calculating the average peak power of the laser according to the optical power value which is larger than zero in the preset time period.
The second aspect of the present invention provides a laser peak power testing apparatus, including: the integrating sphere is used for acquiring a pulse laser signal of the laser; the detector is used for converting the pulse laser signal into a first voltage signal; the data acquisition card is used for periodically acquiring a first voltage signal and calculating an optical power value according to a preset calibration coefficient and the first voltage signal; presetting a calibration coefficient as a parameter representing the corresponding relation between the voltage signal and the optical power value; and the peak power calculation module is used for comparing the optical power values in the preset time period and determining the maximum value of the optical power values as the peak power of the laser.
Optionally, the laser peak power testing apparatus provided by the present invention further includes a preset calibration coefficient obtaining module; the preset calibration coefficient acquisition module comprises: the parameter acquisition submodule is used for acquiring the calibration power of the continuous laser and converting the optical signal of the continuous laser into a second voltage signal; and the preset calibration coefficient calculation submodule is used for calculating a preset calibration coefficient according to the calibration power and the second voltage signal.
Optionally, the laser peak power testing apparatus provided by the present invention further includes a noise reduction module, configured to perform noise reduction processing on the optical power value within a preset time period.
Optionally, the laser peak power testing apparatus provided by the present invention further includes an average peak power calculating module, configured to calculate an average peak power of the laser according to an optical power value greater than zero in a preset time period.
The technical scheme of the invention has the following advantages:
1. the laser peak power testing method provided by the invention comprises the steps of firstly converting a pulse signal into a first voltage signal, then periodically obtaining the first voltage signal, calculating an optical power value according to a preset calibration coefficient and the first voltage signal, and judging the maximum value in the optical power value as peak power. When the peak power is calculated by the laser peak power testing method provided by the invention, the first voltage signal is obtained at intervals, and then the optical power values at different moments are calculated according to the first voltage signal.
2. The laser peak power testing method provided by the invention converts the optical signal of continuous laser into the second voltage signal, then calculates the preset calibration coefficient according to the calibration power of the continuous laser signal and the second voltage signal, and only needs to convert the pulse laser signal into the first voltage signal and then multiply the first voltage signal and the preset calibration coefficient when the laser peak power is tested each time in the subsequent process, thereby simplifying the testing process of the laser peak power.
3. According to the laser peak power testing method provided by the invention, after the optical power values at different moments are obtained through calculation, the optical power values obtained through calculation are denoised, and then the peak power is calculated according to the denoised optical power values, so that the interference on the testing result caused by special situations is avoided, and the testing result on the laser peak power is accurate.
4. According to the laser peak power testing device provided by the invention, when the pulse signal of the laser is obtained, the integrating sphere is adopted, the laser can be more uniformly injected into the detector through the integrating sphere, so that the first voltage signal output by the detector is more accurate, the first voltage signal is periodically obtained through the data acquisition card, the optical power value is calculated according to the first voltage signal and the preset calibration coefficient, the maximum value of the optical power value is selected as the peak power, compared with the prior art that the peak power is calculated through the average optical power, the device can reflect the actual waveform of the laser signal by calculating the optical power values at different moments, and the calculated peak power of the laser is more practical.
5. The laser peak power testing device provided by the invention converts the optical signal of continuous laser into the second voltage signal, then calculates the preset calibration coefficient according to the calibration power of the continuous laser signal and the second voltage signal, and only needs to convert the pulse laser signal into the first voltage signal and then multiply the first voltage signal and the preset calibration coefficient when the laser peak power is tested each time in the subsequent process, thereby simplifying the testing process of the laser peak power.
6. According to the laser peak power testing device provided by the invention, after the light power values at different moments are obtained through calculation, the light power values obtained through calculation are denoised through the denoising module, and then the peak power is calculated through the peak power calculating module, so that the interference caused by special situations on the testing result is avoided, and the testing result on the laser peak power is accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a specific example of a method for peak power testing of a laser in an embodiment of the present invention;
FIG. 2 is a diagram illustrating an actual waveform of a pulse current signal or a laser signal according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an actual waveform of a pulse current signal or a laser signal under a short pulse width according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating an actual waveform of a pulse current signal or a laser signal under a long pulse width according to an embodiment of the present invention;
FIG. 5 is a schematic waveform diagram of a first voltage signal obtained in an embodiment of the present invention;
6-8 are flowcharts of specific examples of laser peak power testing methods in embodiments of the present invention;
fig. 9-12 are schematic block diagrams of a peak power testing apparatus of a laser according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
When testing the peak optical power of a pulsed or quasi-continuous laser, the average optical power P of the laser is measured by a thermopile power meteraviThen measuring the pulse waveform of the output light and calculating to obtain the pulse width twpAnd repetition frequency fpOr measuring the pulse width t of the input current pulse by means of a current gun and an oscilloscopewiAnd repetition frequency fiThe product of the pulse width and the repetition frequency obtains a duty ratio, the average light power is divided by the duty ratio to obtain a peak power, and the calculation formula is as follows:
or the like, or, alternatively,
when the driving pulse is inputWhen the current and the laser signal are ideal square waves, the accurate peak power can be calculated by the measuring method, but in practical situations, the current generally cannot present the ideal square waves, so that the laser signal is not the ideal square waves, and therefore, the peak power of the laser can be only roughly obtained by averaging the light power in the method.
The embodiment of the invention provides a method for testing the peak power of a laser, which comprises the following steps of:
step S10: and acquiring a pulse laser signal of the laser. In practical application, because the driving pulse current has a rising and falling edge, the current cannot be kept consistent in a flat top region of the waveform, as shown in fig. 2, especially the current waveform basically presents a triangular wave shape under a short pulse width, as shown in fig. 3, the current waveform under a long pulse width is likely to present a collapse waveform at the falling edge, as shown in fig. 4, the pulse current cannot present an ideal square wave, so that the pulse laser signal of the laser cannot present an ideal square wave.
Step S20: the pulsed laser signal is converted into a first voltage signal. In an alternative embodiment, the pulsed laser signal may be converted into the first voltage signal, for example, by a detector.
Step S30: in an alternative embodiment, for example, the first voltage signal generated by the detector may be acquired through a data acquisition card, and the first voltage signal acquired in the embodiment of the present invention is as shown in fig. 5, and the optical power value is calculated according to a preset calibration coefficient and the first voltage signal, where the preset calibration coefficient is a parameter representing a corresponding relationship between the voltage signal and the optical power value. In one embodiment, the time period for acquiring the first voltage signal may be adjusted according to the pulse width of the actual pulsed laser signal. When the optical power value is calculated, the first voltage signal is multiplied by a pre-calculated preset calibration coefficient, and the product of the first voltage signal and the pre-calculated preset calibration coefficient is the optical power value corresponding to the first voltage signal.
Step S40: and comparing the optical power values in the preset time period, and determining the maximum value of the optical power values as the peak power of the laser.
The method for testing the peak power of the laser provided by the embodiment of the invention comprises the steps of converting a pulse signal into a first voltage signal, then periodically obtaining the first voltage signal, calculating an optical power value according to a preset calibration coefficient and the first voltage signal, and determining the maximum value in the optical power value as the peak power. When the peak power is calculated by the laser peak power testing method provided by the invention, the first voltage signal is obtained at intervals, and then the optical power values at different moments are calculated according to the first voltage signal.
In an alternative embodiment, as shown in fig. 6, the method for testing the peak power of the laser provided by the embodiment of the present invention obtains the preset calibration coefficient by the following steps:
step S31: obtaining the calibration power P of continuous laser1Converting the optical signal of the continuous laser into a second voltage signal V0；
Step S32: calculating a preset calibration coefficient according to the calibration power and the second voltage signal, wherein the preset calibration coefficient k is the quotient of the calibration power and the second voltage signal, i.e. k is P1/V0。
In one embodiment, when calculating the predetermined calibration factor, the average optical power P of the continuous laser can be measured by a thermopile power meter1And converting the continuous laser into a second voltage signal V0The preset calibration coefficient is k ═ P1/V0Because continuous laser is selected when calculating the calibration coefficient, the waveform of the continuous laser is a horizontal straight line, and no pulse width and repetition frequency exist, the average optical power P measured by the thermopile power meter1The error from the actual power is negligible.
In an alternative embodiment, as shown in fig. 7, after the step S30 and before the step S40, the method further includes:
step S50: and carrying out noise reduction processing on the optical power value in the preset time period.
In the process of calculating the light power value, the deviation between a small number of calculated light power values and an actual value is larger due to external interference or the problem of a laser, and the method for testing the peak power of the laser provided by the embodiment of the invention can avoid the interference on the test result caused by special conditions and further ensure that the test result of the peak power of the laser is accurate.
In an alternative embodiment, as shown in fig. 8, the method for testing the peak power of the laser provided by the embodiment of the present invention further includes:
step S60: and calculating the average peak power of the laser according to the optical power value which is greater than zero in the preset time period, summing the optical power values which are greater than zero, and calculating the average value of the optical power values to obtain the average peak power of the laser.
In one embodiment, the average peak power of the laser is also one of the important indicators for performing the detection of the laser.
Example 2
The present embodiment provides a peak power testing apparatus for a laser, as shown in fig. 9, including:
the integrating sphere 1 is used for acquiring a pulse laser signal emitted by the laser 5, in a specific embodiment, the size of the integrating sphere 1 can be selected according to actual requirements, and in the embodiment of the invention, the selected integrating sphere 1 has a diameter of 250mm and a caliber of 50 mm. The detailed description of the pulsed laser signal is described in embodiment 1 above with respect to step S10.
The detector 2 is configured to convert the pulse laser signal into a first voltage signal, in a specific embodiment, the detector 2 may be selected according to actual requirements, and in an embodiment of the present invention, the detector 2 is a ThorlabsPDA100A model, and the detection band is a Si photodetector 2 with a wavelength range of 340nm to 1100 nm.
The data acquisition card 3 is configured to periodically acquire the first voltage signal, and calculate the optical power value according to the preset calibration coefficient and the first voltage signal, as described in step S30, after the detector converts the pulse laser signal into the first voltage signal, the first voltage signal is not continuously output outwards, so that in order to analyze and research the first voltage signal, the data acquisition card needs to be actively used to acquire the first voltage signal generated by the detector from the detector; the preset calibration coefficient is a parameter representing the corresponding relationship between the voltage signal and the optical power value. In a specific embodiment, the data acquisition card 3 can be selected according to actual requirements, the type of data acquisition selected in the embodiment of the present invention is the card constant rayleigh measurement and control USB-6009 type, and the frequency of the acquired first voltage signal can also be adjusted according to the pulse width of the laser signal, and the sampling frequency of the first voltage signal in the embodiment of the present invention is 24 MHz.
And the peak power calculation module 4 is configured to compare the optical power values in a preset time period, and determine a maximum value of the optical power values as the peak power of the laser 5.
According to the laser peak power testing device provided by the invention, when the pulse signal of the laser 5 is obtained, the integrating sphere 1 is adopted, laser can be more uniformly emitted into the detector 2 through the integrating sphere 1, so that a first voltage signal output by the detector 2 is more accurate, the first voltage signal is periodically obtained through the data acquisition card 3, then the optical power value is calculated according to the first voltage signal and the preset calibration coefficient, the maximum value of the optical power value is selected as the peak power, compared with the prior art that the peak power is calculated through the average optical power, the device can reflect the actual waveform of the laser signal by calculating the optical power values at different moments, and the calculated peak power of the laser 5 is more practical.
In an optional embodiment, as shown in fig. 10, the laser peak power testing apparatus provided in the embodiment of the present invention further includes a preset calibration coefficient obtaining module 6, where the preset calibration coefficient obtaining module 6 includes:
and the parameter obtaining submodule 61 is configured to obtain the calibration power of the continuous laser, and convert the optical signal of the continuous laser into a second voltage signal. The detailed description is given in the above-described embodiment 1 to the description of step S31.
And the preset calibration coefficient calculation submodule 62 is configured to calculate a preset calibration coefficient according to the calibration power and the second voltage signal. The detailed description is given in the above-described embodiment 1 to the description of step S32.
In an optional embodiment, as shown in fig. 11, the laser peak power testing apparatus according to the embodiment of the present invention further includes a noise reduction module 7, where the noise reduction module 7 is disposed between the data acquisition card 3 and the peak power calculation module 4, and is configured to perform noise reduction processing on the optical power value within a preset time period. The detailed description is given in the above-described embodiment 1 to the description of step S50.
According to the laser peak power testing device provided by the embodiment of the invention, after the light power values at different moments are obtained through calculation, the light power values obtained through calculation are denoised through the denoising module 7, and then the peak power is calculated through the peak power calculating module 4, so that the interference caused by special situations on the testing result is avoided, and the testing result on the peak power of the laser 5 is accurate.
In an optional embodiment, as shown in fig. 12, the laser peak power testing apparatus according to the embodiment of the present invention further includes an average peak power calculating module 8, where the average peak power calculating module 8 is disposed after the data acquisition card 3 and is configured to calculate the average peak power of the laser 5 according to the optical power value greater than zero in the preset time period.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A method for peak power testing of a laser, comprising:
acquiring a pulse laser signal of a laser;
converting the pulsed laser signal into a first voltage signal;
periodically acquiring the first voltage signal, and calculating an optical power value according to a preset calibration coefficient and the first voltage signal; the preset calibration coefficient is a parameter representing the corresponding relation between the voltage signal and the optical power value;
and comparing the optical power values in a preset time period, and determining the maximum value of the optical power values as the peak power of the laser.
2. The method for testing the peak power of the laser according to claim 1, wherein the preset calibration coefficient is obtained by:
obtaining the calibration power of continuous laser, and converting the optical signal of the continuous laser into a second voltage signal;
and calculating the preset calibration coefficient according to the calibration power and the second voltage signal.
3. The method for testing peak power of a laser according to claim 1, wherein after the step of periodically obtaining the first voltage signal, calculating an optical power value according to a preset calibration coefficient and the first voltage signal, and before the step of comparing optical power values in a preset time period, the method further comprises:
and carrying out noise reduction processing on the optical power value in the preset time period.
4. The method for laser peak power testing according to any one of claims 1-3, further comprising:
and calculating the average peak power of the laser according to the optical power value which is larger than zero in the preset time period.
5. A laser peak power testing apparatus, comprising:
the integrating sphere is used for acquiring a pulse laser signal of the laser;
the detector is used for converting the pulse laser signal into a first voltage signal;
the data acquisition card is used for periodically acquiring the first voltage signal and calculating an optical power value according to a preset calibration coefficient and the first voltage signal; the preset calibration coefficient is a parameter representing the corresponding relation between the voltage signal and the optical power value;
and the peak power calculation module is used for comparing the optical power values in a preset time period and determining the maximum value of the optical power values as the peak power of the laser.
6. The device for testing the peak power of the laser according to claim 5, further comprising a preset calibration coefficient obtaining module;
the preset calibration coefficient obtaining module comprises:
the parameter acquisition submodule is used for acquiring the calibration power of the continuous laser and converting the optical signal of the continuous laser into a second voltage signal;
and the preset calibration coefficient calculation submodule is used for calculating the preset calibration coefficient according to the calibration power and the second voltage signal.
7. The laser peak power testing apparatus according to claim 5, further comprising:
and the noise reduction module is used for carrying out noise reduction processing on the optical power value in the preset time period.
8. The laser peak power testing apparatus according to any one of claims 5 to 7, further comprising:
and the average peak power calculation module is used for calculating the average peak power of the laser according to the optical power value which is greater than zero in the preset time period.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111880163A (en) * | 2020-07-02 | 2020-11-03 | 深圳市速腾聚创科技有限公司 | Method and system for detecting performance of transmitting device |
| CN112683398A (en) * | 2020-12-15 | 2021-04-20 | 深圳瑞丰恒激光技术有限公司 | Solid laser power measurement calibration method and device |
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Address after: 215163 No.2 workshop-1-102, No.2 workshop-2-203, zone a, industrial square, science and Technology City, No.189 Kunlunshan Road, high tech Zone, Suzhou City, Jiangsu Province Applicant after: Suzhou Changguang Huaxin Optoelectronic Technology Co.,Ltd. Address before: 215163 Building 2, No.189, Kunlunshan Road, high tech Zone, Suzhou City, Jiangsu Province Applicant before: SUZHOU EVERBRIGHT PHOTONICS TECHNOLOGY Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200421 |
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| RJ01 | Rejection of invention patent application after publication |