Laser power correction method and device for inhibiting relaxation oscillation and laser

Abstract

The invention provides a laser power correction method and device for suppressing relaxation oscillation and a laser, and the method comprises the steps: setting a first duty ratio and a first frequency of the laser, adjusting the current to enable the average power to be preset power, and recording the current current value; adjusting the frequency to enable the average power to be preset power, and recording all frequency values to obtain a frequency interval; changing the duty ratio to obtain a frequency interval under each duty ratio; setting a second duty ratio, representing frequency, adjusting current to enable the average power to be minimum and maximum, recording the minimum and maximum current, and determining a current-average power relationship; and changing the duty ratio to obtain the current-average power relationship of different frequency intervals under each duty ratio. The method is suitable for a pulse laser control mode in which small step signals for suppressing relaxation oscillation are added, the current-average power relation is determined by actually measuring the power output value, and accurate correction of the laser is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser power correction, and in particular to a laser power correction method and device for suppressing relaxation oscillation, and a laser. Background Art

[0002] In pulsed laser, the calculation formula of laser power is as follows: Where P a is the average power, P p is the peak power, t is the peak pulse duration, and f is the pulse output frequency. If you want to change the average laser power, you can modify P p At least one of the three parameters , t, and f.

[0003] However, after the laser leaves the factory, it will naturally age and be affected by time and environment. When the laser is actually used, its current-peak power curve relationship may deviate from the factory specifications, so power calibration is required to determine the actual current-peak power relationship. The existing power calibration method recalibrates the drive current when it is considered that the average power of the laser output is inaccurate.

[0004] Taking fiber laser as an example, when its gain fiber generates laser, there is relaxation oscillation. If it is not suppressed, there is a high probability of damaging the optical components in the laser optical path. Therefore, it is necessary to suppress the peak power of the relaxation oscillation within an acceptable range, for example, by adding a small step signal to suppress the relaxation oscillation in the driving current square wave.

[0005] The existing correction method performs correction calculations on the premise of a square wave. After adding a small step signal to suppress relaxation oscillation, the laser energy of the small step is increased. According to the existing correction method, the output laser average power will be inaccurate. Summary of the invention

[0006] To solve the above problems, the present invention provides a laser power correction method for suppressing relaxation oscillation, comprising: step one, setting the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjusting the current so that the average power output by the laser is a preset power, and recording the current value; the waveform of the current includes a first order and a second order, the amplitude of the first order is smaller than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the current signal of the first order is smaller than a safety threshold; step two, adjusting the frequency with the current current value and the first duty cycle so that the average power output by the laser is the preset power, and recording all frequency values ​​to obtain a frequency interval; changing the duty cycle, repeating steps one and two, and obtaining the frequency interval of the laser at each frequency intervals under a duty cycle; each of the frequency intervals corresponds to a representative frequency; step three, setting the duty cycle of the laser to a second duty cycle and the frequency to the representative frequency, adjusting the current so that the average power output by the laser is the minimum average power and the maximum average power, and recording the corresponding current as the minimum current and the maximum current; and determining the current-average power relationship according to the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first order, the duration of the first order, and the representative frequency; changing the duty cycle, repeating step three, and obtaining the current-average power relationship of the laser at each duty cycle and in different frequency intervals.

[0007] The laser power correction method for suppressing relaxation oscillation provided in an embodiment of the present invention is applicable to a pulse laser control method that adds a small step signal for suppressing relaxation oscillation. It not only refers to the current power curve of the laser manufacturer, but also determines the actual current-average power relationship by actually measuring the power output value of the laser, thereby achieving accurate correction of the laser.

[0008] Optionally, the current-average power relationship is as follows:

[0009] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0010] Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, PIth *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

[0011] The embodiment of the present invention provides a calculation formula for the current-average power relationship, which can achieve accurate correction of the laser.

[0012] Optionally, the preset power is the minimum average power or the maximum average power of the laser; or, the preset power is the power within a tolerance of the minimum average power or the maximum average power of the laser.

[0013] In the embodiment of the present invention, the relationship between the current and the average power is determined based on the minimum average power, the maximum average power and their corresponding minimum current and maximum current, so as to achieve accurate correction of the laser.

[0014] Optionally, the median of the frequency interval is set as the corresponding representative frequency.

[0015] In the embodiment of the present invention, the frequencies involved in the laser are segmented, thereby simplifying the workload of power calibration.

[0016] Optionally, the method further includes: determining the single pulse energy of the first order.

[0017] The correction method in the embodiment of the present invention further comprises calculating the single pulse energy of the small step signal that suppresses relaxation oscillation, thereby determining the pulse energy of the small step signal and its influence on the normal output of the laser.

[0018] Optionally, the calculation formula of the single pulse energy is as follows:

[0019] E=P a_It0 / f

[0020] Where E is the single pulse energy, P a_It0 is the average power of the first order, and f is the frequency.

[0021] Optionally, the calculation formula of the single pulse energy is as follows:

[0022] E=P a_It0* t0

[0023] Where E is the single pulse energy, P a_It0 is the average power of the first order, and t0 is the duration of the first order.

[0024] The embodiment of the present invention provides a specific calculation method for the pulse energy of a small step signal, so as to determine the pulse energy of the small step signal and its influence on the normal output of the laser.

[0025] The embodiment of the present invention provides a laser power correction device for suppressing relaxation oscillation, comprising: a frequency segmentation module, which is used to perform the following steps: step one, setting the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjusting the current so that the average power output by the laser is a preset power, and recording the current current value; the waveform of the current includes a first order and a second order, the amplitude of the first order is less than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the current signal of the first order is less than a safety threshold; step two, adjusting the frequency with the current current value and the first duty cycle so that the average power output by the laser is the preset power, and recording all frequency values ​​to obtain a frequency interval; changing the duty cycle, repeating steps one and two, and obtaining the frequency interval of the laser at each duty cycle. frequency interval under the duty cycle; each frequency interval corresponds to a representative frequency; a power correction module, used to perform the following steps: step three, setting the duty cycle of the laser to a second duty cycle and the frequency to the representative frequency, adjusting the current so that the average power output by the laser is the minimum average power and the maximum average power, and recording the corresponding current as the minimum current and the maximum current; and determining the current-average power relationship according to the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first order, the duration of the first order, and the representative frequency; changing the duty cycle, repeating step three, and obtaining the current-average power relationship of the laser at each duty cycle and in different frequency intervals.

[0026] Optionally, the current-average power relationship is as follows:

[0027] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0028] Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax*D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

[0029] An embodiment of the present invention provides a laser, comprising a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the above-mentioned laser power correction method for suppressing relaxation oscillation is implemented.

[0030] The laser power correction device and laser for suppressing relaxation oscillation provided in the embodiments of the present invention can achieve the same technical effect as the laser power correction method for suppressing relaxation oscillation described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 The driving current and the laser output power curve of the laser diode provided by the embodiment of the present invention;

[0033] Figure 2 A schematic flow chart of a laser power calibration method for suppressing relaxation oscillation provided in an embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram of a laser power correction device for suppressing relaxation oscillation provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The parameters involved in the embodiments of the present invention are as follows: average power (average power)-Pa, peak power (peak power)-Pp, pulse energy (pulse energy)-Ep, pulse output frequency (frequency)-f, duty ratio (duty ratio)-D, peak pulse duration t.

[0037] Patent 202410703660X already records a laser current control method for suppressing laser relaxation oscillation, and designs a small step current waveform to suppress relaxation oscillation. Among them, the current control algorithm formula for suppressing relaxation oscillation is as follows:

[0038] P out =P p_It0* (t 0* f)+[(I out -I th ) / (I max -I th )]*(P pmax *D)

[0039] Among them, P out is the average laser output power, P p_It0 is the peak power corresponding to the first order, t0 is the duration of the first order, f is the representative frequency, I out is the driving current, I max is the maximum drive current, I th is the threshold current, P pmax is the laser peak power corresponding to the maximum driving current, and D is the duty cycle corresponding to the second order.

[0040] A premise of the above derivation formula is as described in the patent description, I th The selected value is when the laser diode (LD) just emits light, and the average power at this time can be basically ignored. In actual laser medical device products, each time the threshold current I is selected when the laser LD just emits light th For example, using a laser power meter to measure the threshold current I th The average power of the laser output when driving the LD. The average power itself is very weak at this time, so it is difficult to measure it, and it is difficult to judge I th Take the appropriate amount.

[0041] In order to solve the difficulties in the above description, the above control algorithm is expanded and the minimum output average power of a product is selected as I th The corresponding average power P aIth , at this time I th The corresponding peak power is P th .

[0042] Figure 1 is the driving current and laser output power curve of the laser diode. Figure 1 The lower middle part is the current-laser peak power curve, and the upper part is the current-voltage curve. Figure 1The current at point A is I th , the corresponding peak power is P Ith , the current at point E is I out , the corresponding peak power is P pset , the current at point B is I max , the corresponding peak power is P pmax .

[0043] The embodiment of the present invention is according to Figure 1 Further expansion of the algorithm in the existing patent 202410703660X can obtain formula ①:

[0044] I out = [ (P out -P p_It0 *t0 * f- P Ith *D ) / (P pmax *D - P Ith *D) ](I max -I th )+ I th ①

[0045] Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

[0046] based on Figure 1 As shown, formula ① is derived as follows:

[0047]

[0048] Therefore, when calibrating the power, we only need to find the I corresponding to each frequency segment. max and I th , and P pmax , you can set the P pset Calculate the required current; peak power P Ith The average power P at this time aIth The formula relationship is as follows:

[0049] P Ith =P aIth / D Formula 2

[0050] D is the duty cycle, P aIth is the average power, P Ith It is at this time th The corresponding peak power at duty cycle D.

[0051] According to the current-peak power curve derived from the above formula, if I th =1.5A, the corresponding P Ith =0, then P in the above formula 1 Ith The effect of is negligible, which is equivalent to:

[0052] I out =(P pset )(I max -I th ) / (P pmax )+I th

[0053] According to actual needs, you can choose the appropriate peak power (I th ,P Ith ) as a starting point.

[0054] The average power P of the laser output out , equal to the average power P of the small step t0 Add the average power P output by the current curve set , so we have:

[0055] P out =P t0 +P Iout Formula 3

[0056] And because the average output power P Iout Equal to I out The corresponding peak power P pset Multiplying by the duty cycle D, that is, adjusting the current corresponding to the effective current t1 time period, a laser peak power P can be obtained. pset , the peak power multiplied by the duty cycle equals the average power P at this time Iout ,then:

[0057] P Iout = P pset * D Formula 4

[0058] Again, because of formulas 1, 2, and 4,

[0059] ∴ I out = [(P Iout -P aIth ) / (P pmax *D - PaIth ) ] * (I max -I th )+ I th Formula 5

[0060] According to similar triangles, I th You can take the value when the laser just starts to emit light and is ready to emit laser light (the laser peak power at this time is close to 0W). This value is fixed according to the laser pump source model. You can also set this I according to the laser flat power range of the laser. th Take a bigger one, get the right one (I th ,P Ith ). For example, if the average laser power range is 0.5W to 20W, then P aIth = 0.5W can be passed through P Ith =P aIth / D calculates the peak power P Ith， However, according to Formula 4 derived from Formula 1, Formula 4 at this time becomes:

[0061] I out =[(P Iout –0.5) / (P pmax *D–0.5)]*(I max -I th )+I th

[0062] And because the maximum output current I max It must correspond to the maximum laser peak power P pmax , so P pmax and I max is a fixed known value. And because the duty cycle of the output current waveform is known, the average power P required to be output is Iout You can calculate how much current I the MCU needs to output out .

[0063] According to formula 3, there is a small step difference between the laser power output by the laser device terminal and the average laser power output by current regulation. t0， Because the current value and duration t0 of the small step that suppresses relaxation oscillation damage are fixed through circuit debugging (the principle is to debug the output current size and t 0， Observe whether the waveform of laser waveform relaxation oscillation does not exceed the tolerance value of optical path optical devices), so P t0 is a constant. So as long as P is calculated t0 , the regulated output current I can be obtained out and the average power P output by the laser device terminal out The relationship is as follows:

[0064] I out = ( ((P out -P t0 ) - P aIth ) / (P pmax *D - P aIth ) ) (I max -I th )+ I th Formula 6

[0065] The calculation method of the average power corresponding to the small step "t0" time is as follows.

[0066] I t0 The corresponding average power P in continuous mode t0_cw for:

[0067] P t0_cw =P p_It0

[0068] Because the width of the small step is t0, it can be considered that t0 is also a pulse waveform output at a frequency f under a certain duty cycle, and its duty cycle is:

[0069] D t0 =t0 / T=t0*f

[0070] Because the average power of the laser output in PWM mode is equal to the peak power multiplied by the duty cycle, the average power of the small step is:

[0071] P t0 =P p_It0* D t0 =P p_It0* (t0*f)

[0072] Because P p_It0 According to I t0 It is found that t0 is a fixed value from debugging, so P t0 It is also a fixed value.

[0073] So formula 6 can be transformed into the following form:

[0074] I out =[(P out -P p_It0* t0*fP Ith *D) / (P pmax *DP Ith *D)]*(I max -I th )+I th。

[0075] Based on this formula, an embodiment of the present invention designs a power correction method that can be better applied to laser medical products.

[0076] Figure 2 A schematic flow chart of a laser power calibration method for suppressing relaxation oscillation provided in an embodiment of the present invention is shown. The method includes a frequency segmentation process S21 and a power calibration process S22.

[0077] The above frequency segmentation process can segment the frequencies involved in the laser and simplify the workload of power calibration. It specifically includes the following steps:

[0078] Step 1: Set the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjust the current so that the average power output by the laser is a preset power, and record the current value.

[0079] As in the aforementioned method for suppressing relaxation oscillation, the waveform of the current includes the first order and the second order, the amplitude of the first order is smaller than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the first order current signal is smaller than the safety threshold. The safety threshold is affected by the parameters of the components in the laser driving circuit, and the relaxation oscillation with an amplitude lower than the safety threshold will not damage the components in the optical path.

[0080] Since the higher the driving current, the higher the peak power generated by the laser diode, the higher the relaxation oscillation waveform caused in the early stage of laser balance establishment. When it is higher than a certain value, the optical device may be burned out. Therefore, this embodiment first uses a smaller first-order current to establish the laser balance of the laser, and then outputs a large current corresponding to the effective PWM (PulseWidth Modulation) signal. In this way, when the large current is output to the laser diode, because the laser balance has been basically established, the subsequent large current driving the laser diode will not cause a large relaxation oscillation waveform. The amplitude of the relaxation oscillation waveform caused by the small step current in the front is relatively small, which is within the acceptance range of the optical devices in the optical path, thereby successfully suppressing the damage of the relaxation oscillation to the optical devices in the optical path.

[0081] Optionally, the preset power may be the minimum average power or the maximum average power of the laser; or, the preset power is a power within a tolerance of the minimum average power or the maximum average power of the laser. Exemplarily, the tolerance is 20%.

[0082] In this embodiment, the operation is first fixed at a certain duty cycle and frequency, and the average power of the output is detected while adjusting the current to obtain the current corresponding to the preset power under this condition.

[0083] Current regulations on laser medical devices require that the output power of the laser terminal must be within ±20% of the power stated in the product technical requirements. For example, the power range of the product is 0.5W to 20W, and the frequency adjustment range is 1Hz to 250Hz. As described in the prior patent, I th The frequency of the drive exists th =Af+B, but according to the tolerance range required by the national inspection, the output frequency of the laser can be set to f, and then the duty cycle D=5%, and the output current can be adjusted to make the average power obtained at the power meter end within the range of 0.5W±20%, and the current at this time is recorded as I th .

[0084] Step 2: Using the current current value and the first duty cycle, adjust the frequency so that the average power output by the laser is the above-mentioned preset power, and record all frequency values ​​to obtain the frequency range.

[0085] In this embodiment, the operation is fixed at a certain duty cycle and current, and the average output power is detected while adjusting the frequency to obtain all frequency values ​​that can output the above preset frequency. The above frequency values ​​constitute a frequency range.

[0086] At this time, the fixed output I th and D = 5%, start to modify f, and you can count some continuous frequency ranges (such as 0Hz ~ 150Hz, 151Hz ~ 250Hz), the same I th The effect of 0.5W±20% can be obtained. So these frequency ranges are placed in the above frequency range of 5% duty cycle, for example, the pulse width position of 5% duty cycle is set to two frequency segments, 0Hz~150Hz and 151Hz~250Hz respectively.

[0087] The duty cycle is changed, and the above steps 1 and 2 are repeated to obtain the frequency range of the laser at each duty cycle. Each frequency range corresponds to a representative frequency.

[0088] By repeating steps 1 and 2, the frequency segmentation of the laser at all duty cycles can be obtained. There is a logic here. Since I th Under a fixed duty cycle D, within a certain frequency range, the average output power is within 0.5W±20%, so the middle frequency of this frequency range is taken and marked as f re , according to I th =Af+B, it can be seen that this f re It can represent all frequencies in the frequency interval in which it is located to participate in the calculation of the current output. Exemplarily, the median of the above frequency interval can be set as the corresponding representative frequency.

[0089] Based on the above frequency interval division, even if there are many frequencies, power correction can be performed quickly within the tolerance.

[0090] The above power correction process can select the maximum and minimum points of the "current-power curve" to formulate an equation. Specifically, it includes the following steps:

[0091] Step 3, set the duty cycle of the laser to the second duty cycle, the frequency to the above representative frequency, adjust the current so that the average power output by the laser is the minimum average power and the maximum average power, and record the corresponding current as the minimum current and the maximum current. And, determine the current-average power relationship based on the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first order, the duration of the first order, and the representative frequency.

[0092] Optionally, the current-average power relationship in this embodiment is as follows:

[0093] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0094] Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

[0095] In this embodiment, the fixed duty cycle D=D sp, The frequency is the representative frequency f of the aforementioned frequency range re At this time, adjust the output current so that the average power of the laser output reaches the minimum power (for example, the aforementioned minimum output average power is 0.5W), and record the current at this time as the minimum current I in this frequency range. th Then continue to adjust the output current to make the laser output average power reach the maximum average power (for example, the maximum output average power mentioned above is 20W), and record the maximum current I at this timemax .

[0096] Based on the fact that average power is equal to peak power multiplied by duty cycle, P in formula ① is Ith *D and P pmax *D has been determined (the minimum peak power P Ith and the maximum peak power P pmax can be determined), and the previous example is 0.5W and 20W respectively. f is f re , so we get P out and I out The user can set different average power P on the screen. out , the required output current can be calculated.

[0097] Based on the above relationship among average power, peak power and duty cycle, the average power output range of various products can be flexibly adapted, which also reflects the advantages of the embodiments of the present invention.

[0098] Change the duty cycle and repeat the above step 3 to obtain the current-average power relationship of the laser at various duty cycles and in different frequency ranges.

[0099] Continuing with the previous example, the duty cycle is modified to be D = D mp =10%, D = D lp =20%, repeat step 3 to get the linear equation relationship of "current-average power" in different frequency ranges under different duty cycles.

[0100] Based on the above power correction method, the data shown in Table 1 are obtained.

[0101]

[0102]

[0103]

[0104] Table 1

[0105] Three duty cycles are shown in Table 1: sp =5%, D mp =10%, D lp = 20%, the frequency range is 0Hz ~ 150Hz (representative frequency is 75Hz) and 151Hz ~ 250Hz (representative frequency is 200Hz), the average power output range is 0.5W-5W, 0.5W-10W, 0.5W-20W, and the corresponding current value is measured. Further, based on the above formula ①, the relationship between current and average power in different frequency ranges under each duty cycle can be obtained.

[0106] The laser power correction method for suppressing relaxation oscillation provided in an embodiment of the present invention is applicable to a pulse laser control method that adds a small step signal for suppressing relaxation oscillation. It not only refers to the current power curve of the laser manufacturer, but also determines the actual current-average power relationship by actually measuring the power output value of the laser, thereby achieving accurate correction of the laser.

[0107] Furthermore, the embodiment of the present invention also provides the above-mentioned step single pulse energy for suppressing the relaxation oscillation phenomenon.

[0108] First, set the current and duration t0 required for outputting the small step suppressing the relaxation oscillation phenomenon, and set the small step optical signal to output at 100Hz or above (the frequency selection mainly depends on the range and division of the power meter during the test. If the power meter is very sensitive, a smaller frequency output can be selected. If it is not very sensitive, a larger frequency output can be selected so that the power meter can measure and identify it). Then, according to the average power being equal to the pulse energy multiplied by the frequency, the average power obtained by the power meter can be divided by the frequency output at this time to obtain the "relaxation oscillation step single pulse energy" E for suppressing the small step of relaxation oscillation. As recorded in the last row of Table 1.

[0109] Optionally, the single pulse energy is calculated as follows: E = P a_It0 / f or, E=P a_It0* t0

[0110] Where E is the single pulse energy, P a_It0 is the average power of the first order, f is the frequency, and t0 is the duration of the first order.

[0111] Figure 3 The structure diagram of a laser power correction device for suppressing relaxation oscillation provided by an embodiment of the present invention is shown, and the device comprises:

[0112] The frequency segmentation module 301 is used to perform the following steps:

[0113] Step 1, setting the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjusting the current so that the average power output by the laser is a preset power, and recording the current value; the waveform of the current includes a first order and a second order, the amplitude of the first order is smaller than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the current signal of the first order is smaller than a safety threshold;

[0114] Step 2: adjusting the frequency according to the current current value and the first duty cycle so that the average power output by the laser is the preset power, and recording all frequency values ​​to obtain a frequency interval;

[0115] Changing the duty cycle, repeating step 1 and step 2, to obtain the frequency interval of the laser at each duty cycle; each frequency interval corresponds to a representative frequency;

[0116] The power correction module 302 is used to perform the following steps:

[0117] Step three, setting the duty cycle of the laser to the second duty cycle and the frequency to the representative frequency, adjusting the current so that the average power output by the laser is the minimum average power and the maximum average power, and recording the corresponding current as the minimum current and the maximum current; and determining the current-average power relationship according to the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first order, the duration of the first order, and the representative frequency;

[0118] The duty cycle is changed, and step three is repeated to obtain the current-average power relationship of the laser at various duty cycles and in different frequency ranges.

[0119] Optionally, the current-average power relationship is as follows:

[0120] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0121] Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

[0122] An embodiment of the present invention provides a laser, comprising a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the above-mentioned laser power correction method for suppressing relaxation oscillation is implemented.

[0123] The laser power correction device and laser for suppressing relaxation oscillation provided in the embodiments of the present invention can achieve the same technical effect as the laser power correction method for suppressing relaxation oscillation provided in the above embodiments, and will not be described again here to avoid repetition.

[0124] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0125] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0126] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser power correction method for suppressing relaxation oscillation, characterized in that: include: Step 1, setting the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjusting the current so that the average power output by the laser is a preset power, and recording the current current value; The waveform of the current includes a first order and a second order, the amplitude of the first order is smaller than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the current signal of the first order is smaller than a safety threshold; Step 2: adjusting the frequency according to the current current value and the first duty cycle so that the average power output by the laser is the preset power, and recording all frequency values ​​to obtain a frequency interval; Changing the duty cycle, repeating step 1 and step 2, to obtain the frequency interval of the laser at each duty cycle; each frequency interval corresponds to a representative frequency; Step 3, setting the duty cycle of the laser to the second duty cycle and the frequency to the representative frequency, adjusting the current so that the average power output by the laser is the minimum average power and the maximum average power, and recording the corresponding current as the minimum current and the maximum current; and determining a current-average power relationship according to the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first step, the duration of the first step, and the representative frequency; The duty cycle is changed, and step three is repeated to obtain the current-average power relationship of the laser at various duty cycles and in different frequency ranges.

2. The method according to claim 1, characterized in that The current-average power relationship is as follows: I out =[(P out -P p_It0 *t0*f-P Ith *D) / (P pmax *D-P Ith *D)](I max -I th )+I th Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

3. The method according to claim 1, characterized in that The preset power is the minimum average power or the maximum average power of the laser; or, The preset power is a power within a tolerance range between the minimum average power and the maximum average power of the laser.

4. The method according to claim 1, characterized in that: The median value of the frequency interval is set as the corresponding representative frequency.

5. The method according to claim 1, characterized in that The method also includes determining a single pulse energy of the first order.

6. The method according to claim 5, characterized in that The calculation formula of the single pulse energy is as follows: E=P a_It0 / f Where E is the single pulse energy, P a_It0 is the average power of the first order, and f is the frequency.

7. The method according to claim 5, characterized in that The calculation formula of the single pulse energy is as follows: E=P a_It0* t0 Where E is the single pulse energy, P a_It0 is the average power of the first order, and t0 is the duration of the first order.

8. A laser power correction device for suppressing relaxation oscillation, characterized in that: include: The frequency segmentation module is used to perform the following steps: Step 1, setting the duty cycle of the laser to a first duty cycle and the frequency to a first frequency, adjusting the current so that the average power output by the laser is a preset power, and recording the current value; the waveform of the current includes a first order and a second order, the amplitude of the first order is smaller than the amplitude of the second order, and the amplitude of the laser relaxation oscillation waveform induced by the current signal of the first order is smaller than a safety threshold; Step 2: adjusting the frequency according to the current current value and the first duty cycle so that the average power output by the laser is the preset power, and recording all frequency values ​​to obtain a frequency interval; Changing the duty cycle, repeating step 1 and step 2, to obtain the frequency interval of the laser at each duty cycle; each frequency interval corresponds to a representative frequency; The power correction module is used to perform the following steps: Step three, setting the duty cycle of the laser to the second duty cycle and the frequency to the representative frequency, adjusting the current so that the average power output by the laser is the minimum average power and the maximum average power, and recording the corresponding current as the minimum current and the maximum current; and determining the current-average power relationship according to the minimum current, the maximum current, the peak power corresponding to the maximum current, the peak power corresponding to the minimum current, the second duty cycle, the peak power corresponding to the first order, the duration of the first order, and the representative frequency; The duty cycle is changed, and step three is repeated to obtain the current-average power relationship of the laser at various duty cycles and in different frequency ranges.

9. The device according to claim 8, characterized in that The current-average power relationship is as follows: I out =[(P out -P p_It0 *t0*f-P Ith *D) / (P pmax *D-P Ith *D)](I max -I th )+I th Among them, I out is the current, P out is the average laser output power, P p_It0 is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith *D is the minimum average power, P pmax *D is the maximum average power, P pmax is the peak power corresponding to the maximum current, P Ith is the peak power corresponding to the minimum current, D is the duty cycle, I max is the maximum current, I th is the minimum current.

10. A laser, characterized in that: The invention comprises a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the laser power correction method for suppressing relaxation oscillation as claimed in any one of claims 1 to 7 is implemented.

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