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

Abstract

The invention provides an automatic laser power correction method and device for inhibiting relaxation oscillation and a laser, and relates to the technical field of laser power correction, and the method comprises the steps: obtaining the actual peak power, collected by a photoelectric sensor, of the laser; if the deviation between the actual peak power and the factory peak power is greater than a threshold value, executing an automatic power correction process; according to the power automatic correction process, a preset current-average power relation can be updated according to the first current value, the second current value and the third current value under different duty ratios and different frequencies, and a corrected current-average power relation is obtained. The embodiment of the invention can autonomously judge whether the output power has deviation or not and automatically correct, is suitable for a pulse laser control mode for increasing small step signals for suppressing relaxation oscillation, can improve the accuracy of the output power of the laser, and more reliably guarantees the availability of equipment.

Description

Technical Field

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

[0002] After the laser leaves the factory, it will age naturally due to the influence of time and environment. In actual use, its current-peak power relationship deviates from the specifications recorded in the factory, so power calibration is required to find out the actual current-peak power relationship. The current laser power calibration method will recalibrate the relationship between the drive current and power if it is determined that the average power output of the laser is inaccurate.

[0003] Taking fiber laser as an example, relaxation oscillation will occur when its gain fiber generates laser. If it is not suppressed, there is a high probability that the optical components in the optical path will be damaged. Therefore, it is necessary to suppress the peak power of the relaxation oscillation to within an acceptable range. For example, a small step signal can be added to the driving current square wave to suppress the relaxation oscillation.

[0004] The current laser power correction method performs correction calculations under the premise of a square wave. After adding the above-mentioned small step signal, there is an additional small step of laser energy. According to the existing correction method, the output laser average power will be too large, and it is impossible to autonomously detect whether a deviation has occurred, resulting in long-term inaccurate output power. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for automatically correcting laser power for suppressing relaxation oscillation, which is applied to laser medical equipment, wherein the laser medical equipment includes a photoelectric sensor, and the method includes: obtaining the actual peak power of the laser collected by the photoelectric sensor; the waveform of the driving current of the laser 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; if the deviation between the actual peak power and the factory peak power is greater than the threshold, the power automatic correction process is executed; the power automatic correction process includes: setting the duty cycle and frequency of the laser, adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the first order, and recording the current the first current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, recording the current second current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, recording the current third current value; changing the frequency and re-recording to obtain the first current value, the second current value, and the third current value at each different frequency; changing the duty cycle and re-recording to obtain the first current value, the second current value, and the third current value at each different duty cycle; updating the preset current-average power relationship according to the first current value, the second current value, and the third current value at each different duty cycle and frequency to obtain the corrected current-average power relationship.

[0006] The embodiment of the present invention can autonomously determine whether the output power has deviation and automatically make corrections, and is suitable for a pulse laser control method that adds a small step signal for suppressing relaxation oscillations. It can improve the accuracy of the laser output power and more reliably ensure the availability of the equipment.

[0007] Optionally, the current-average power relationship is as follows:

[0008] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0009] 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, Ppmax *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.

[0010] The embodiment of the present invention provides a calculation formula for the current-average power relationship, which can achieve accurate correction of the laser.

[0011] Optionally, the method further includes: if an average power set by a user is obtained, inputting the average power set by the user into the corrected current-average power relationship to obtain an actual driving current, and driving the laser according to the actual driving current.

[0012] After the user adjusts the average power, the embodiment of the present invention determines the driving current based on the new current-average power relationship and outputs it to the laser diode, thereby achieving accurate power output.

[0013] Optionally, the laser medical device includes a laser module, a space coupler module and a laser terminal handpiece module, and the method also includes: obtaining the transmission efficiency of the space coupler module and the laser terminal handpiece module; determining the conversion relationship between the laser output average power and the actual output average power based on the transmission efficiency; and updating the corrected current-average power relationship based on the conversion relationship to obtain the current-average power relationship after considering the loss.

[0014] The embodiment of the present invention reserves the compensation of the transmission efficiency of the coupler and the handpiece, and there is no need to re-calibrate the power of the laser, thereby further ensuring the average power of the laser output by the terminal and providing a higher guarantee for the reliability of the product.

[0015] Optionally, the method also includes: 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; 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 the above steps, and obtaining the frequency interval of the laser at all duty cycles; each of the frequency intervals corresponds to a representative frequency; and updating the preset current-average power relationship according to the first current value, the second current value, and the third current value at different duty cycles and different representative frequencies to obtain a corrected current-average power relationship.

[0016] The embodiment of the present invention can segment the frequencies involved in the laser medical device, thereby simplifying the workload of power correction.

[0017] Optionally, the method further includes: if a correction request input by a user is received, executing the automatic power correction process.

[0018] The embodiment of the present invention can also execute an automatic power calibration process based on an active request from a user, thereby improving the accuracy of the output power of the laser.

[0019] The embodiment of the present invention provides a laser power automatic correction device for suppressing relaxation oscillation, which is applied to laser medical equipment, wherein the laser medical equipment includes a photoelectric sensor, and the device includes: a detection module, which is used to obtain the actual peak power of the laser collected by the photoelectric sensor; the waveform of the driving current of the laser 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; an automatic correction module, which is used to execute a power automatic correction process if the deviation between the actual peak power and the factory peak power is greater than a threshold; the power automatic correction process includes: setting the duty cycle and frequency of the laser, adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the first order rate, record the current first current value; and adjust the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, record the current second current value; and adjust the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, record the current third current value; change the frequency and re-record to obtain the first current value, the second current value, and the third current value at each different frequency; change the duty cycle and re-record to obtain the first current value, the second current value, and the third current value at each different duty cycle; update the preset current-average power relationship according to the first current value, the second current value, and the third current value at each different duty cycle and different frequency to obtain the corrected current-average power relationship.

[0020] Optionally, the current-average power relationship is as follows:

[0021] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0022] Among them, I out is the current, Pout 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.

[0023] Optionally, the laser medical device includes a laser module, a spatial coupler module and a laser terminal handpiece module, and the device also includes a loss correction module, which is used to: obtain the transmission efficiency of the spatial coupler module and the laser terminal handpiece module; determine the conversion relationship between the laser output average power and the actual output average power according to the transmission efficiency; update the corrected current-average power relationship based on the conversion relationship to obtain the current-average power relationship after considering the loss.

[0024] 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 automatic laser power correction method for suppressing relaxation oscillation is implemented.

[0025] 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

[0026] 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.

[0027] Figure 1 1 is a curve of driving current and laser output power of a laser diode in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a photoelectric sensor provided in an embodiment of the present invention collecting laser signals;

[0029] Figure 3 A schematic flow chart of a method for automatically correcting laser power for suppressing relaxation oscillation provided by an embodiment of the present invention;

[0030] Figure 4 A logic diagram of a method for automatically correcting laser power for suppressing relaxation oscillation provided by an embodiment of the present invention;

[0031] Figure 5 A schematic structural diagram of a laser power automatic correction device for suppressing relaxation oscillation provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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:

[0035] P out =P p_It0* (t 0* f)+[(I out -I th ) / (I max -I th )]*(P pmax *D)

[0036] 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.

[0037] A premise of the above derivation formula is as described in the patent description, I thThe 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.

[0038] 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 .

[0039] 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 1 The 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 .

[0040] 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:

[0041] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th ①

[0042] 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.

[0043] based on Figure 1 As shown, formula ① is derived as follows:

[0044] ∵BC⊥AC, ED⊥AC,

[0045] ∴ED∥BC

[0046] Again, ∠EAD=∠BAC

[0047] ∠AED=∠ABC

[0048] ∠ADE=∠ACB

[0049] ∴△EAD∽△BAC

[0050] ∴ED:BC=AD:AC

[0051] ∴(P pset -P Ith ):(P pmax -P Ith )=(I out -I th ):(I max -I th )

[0052] ∴ I out =(P pset -P Ith ) (I max -I th ) / (P pmax -P Ith )+ I th Formula 1

[0053] 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:

[0054] P Ith =P aIth / D Formula 2

[0055] 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.

[0056] 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 influence of can be ignored, which is equivalent to:

[0057] I out =(P pset )(I max -I th ) / (P pmax )+I th

[0058] According to actual needs, you can choose the appropriate peak power (I th ,P Ith ) as a starting point.

[0059] 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:

[0060] P out =P t0 +P Iout Formula 3

[0061] 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:

[0062] P Iout = P pset * D Formula 4

[0063] Again, because of formulas 1, 2, and 4,

[0064] ∴ I out = [(P Iout -P aIth ) / (P pmax *D - PaIth ) ] * (I max -I th )+ I th Formula 5

[0065] 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 and 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:

[0066] I out =[(P Iout –0.5) / (P pmax *D–0.5)]*(I max -I th )+I th

[0067] 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 .

[0068] 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:

[0069] I out = ( ((P out -P t0 ) - P aIth ) / (P pmax *D - P aIth ) ) (I max -I th )+ I th Formula 6

[0070] The calculation method of the average power corresponding to the small step "t0" time is as follows.

[0071] I t0 The corresponding average power P in continuous mode t0_cw for:

[0072] P t0_cw =P p_It0

[0073] 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:

[0074] D t0 =t0 / T=t0*f

[0075] 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:

[0076] P t0 =P p_It0 *D t0 =P p_It0 *(t0*f)

[0077] 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.

[0078] So formula 6 can be transformed into the following form:

[0079] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)]*(I max -I th )+I th。

[0080] Based on this formula, an embodiment of the present invention designs a laser power automatic correction method that can be better applied to laser medical devices to suppress relaxation oscillation. Exemplarily, the laser medical device includes a photoelectric sensor that can collect laser signals in the optical path.

[0081] Figure 2 The schematic diagram of the photoelectric sensor collecting laser signals is shown. The laser in the optical path passes through the collimator 21 and enters the beam splitter. The beam splitter 21 can reflect 1% of the laser from the main optical path to the photodiode sensor 22, and the rest of the laser is transmitted through the beam splitter 21 to the focusing lens 23. A photodiode dustproof lens 24 is also provided between the beam splitter 21 and the photodiode sensor 22.

[0082] Figure 3 A schematic flow chart of a method for automatically correcting laser power for suppressing relaxation oscillation provided by an embodiment of the present invention is shown, the method comprising:

[0083] S32, obtaining the actual peak power of the laser collected by the photoelectric sensor.

[0084] As in the aforementioned method for suppressing relaxation oscillation, the waveform 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.

[0085] The higher the driving current, the higher the peak power generated by the laser diode, which in turn causes the relaxation oscillation waveform in the early stage of laser balance establishment to be higher. When it is higher than a certain value, the optical device may be burned out. The embodiment of the present invention first uses a smaller first-order current to allow the laser balance to be established first, and then outputs a larger second-order current corresponding to an effective pulse width modulation (PWM) signal. When a large current is output to the laser diode, the laser balance has been basically established, and a large current driving the laser diode will not cause a large relaxation oscillation waveform. The amplitude of the relaxation oscillation waveform caused by the previous small step current is relatively small, which is within the acceptance range of the optical devices in the optical path, thereby successfully avoiding the damage of the optical devices in the optical path due to the relaxation oscillation.

[0086] S34: If the deviation between the actual peak power and the factory peak power is greater than the threshold, the power automatic correction process is executed.

[0087] In this embodiment, the deviation between the actual peak power under a certain current and the factory peak power corresponding to the current can be independently determined. If the deviation is greater than a preset threshold, it is determined that the laser output power is inaccurate and the power automatic correction process needs to be executed in time.

[0088] When the laser LD attenuation needs to be corrected, the corresponding current after attenuation needs to be obtained based on the power parameters at the factory.

[0089] Optionally, in this embodiment, the automatic power calibration process may be executed based on an active request of the user. The above method may further include: if a calibration request input by the user is received, executing the automatic power calibration process.

[0090] The power automatic correction process includes:

[0091] S341, set the duty cycle and frequency of the laser, adjust the current so that the actual peak power output by the laser is the peak power corresponding to the first order, and record the current first current value; and adjust the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, and record the current second current value; and adjust the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, and record the current third current value.

[0092] During the calibration process, the output drive current is gradually adjusted. When the analog-to-digital conversion value of the photodiode sampling feedback is equal to the factory calibration value (first-order peak power, minimum peak power, maximum peak power), the current drive current value is recorded to obtain the new (I th ,P Ith )、(I max ,P pmax ) and (I t0 ,P p_It0 )The coordinates of the three points.

[0093] S342, re-recording after changing the frequency to obtain the first current value, the second current value, and the third current value at different frequencies.

[0094] Under the condition that the duty cycle remains unchanged, the above frequency is changed and then corrected, so as to obtain the above current values ​​at different frequencies.

[0095] S343, re-recording after changing the duty cycle to obtain the first current value, the second current value, and the third current value under different duty cycles.

[0096] The duty cycle is changed, and each duty cycle records the above current values ​​at different frequencies.

[0097] S344, updating the preset current-average power relationship according to the first current value, the second current value, and the third current value at different duty cycles and different frequencies to obtain a corrected current-average power relationship.

[0098] After obtaining all the above (I th ,P Ith )、(Imax ,P pmax ) and (I t0 ,P p_It0 ) The coordinates of the three points are replaced by the new coordinate relationship of the three points instead of the coordinate relationship at the time of leaving the factory. That is, the new current value is substituted into the above preset current-average power relationship, so that formula ① can continue to be applicable to the laser medical device after attenuation.

[0099] The automatic correction method for laser power for suppressing relaxation oscillation provided in the embodiment of the present invention can autonomously determine whether the output power is deviated and automatically perform correction. It is suitable for a pulse laser control method that adds a small step signal for suppressing relaxation oscillation, can improve the accuracy of the laser output power, and more reliably ensure the availability of the equipment.

[0100] Specifically, the current-average power relationship is as follows:

[0101] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0102] 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.

[0103] After the calibration is completed, the laser operation is controlled based on the calibrated current-average power relationship. Based on this, the above method may also include: if the average power set by the user is obtained, the average power set by the user is input into the calibrated current-average power relationship to obtain the actual driving current, and the laser is driven according to the actual driving current. After the user adjusts the average power, the driving current is determined based on the new current-average power relationship and output to the laser diode.

[0104] Laser medical devices record the laser peak value, voltage value and driving current value of the above points when leaving the factory, as shown in Table 2. In Table 2, the driving current corresponding to each power is shown by taking the duty cycle D = 5% and the frequency as the representative frequency fre1 as an example. In addition, there are duty cycle D = 5%, the driving current corresponding to the representative frequency fre2; duty cycle D = 10%, the driving current corresponding to the representative frequency fre1; duty cycle D = 10%, the driving current corresponding to the representative frequency fre2; duty cycle D = 20%, the driving current corresponding to the representative frequency fre1; duty cycle D = 20%, the driving current corresponding to the representative frequency fre2.

[0105]

[0106] Table 2

[0107] After executing the power automatic calibration process, the new (I th ,P Ith )、(I max ,P pmax ) and (I t0 ,P p_It0 Table 3 shows the laser peak value, voltage value and driving current value after attenuation.

[0108] Table 3 shows the driving current I corresponding to each power after attenuation, taking the duty cycle D=5% and the frequency fre1 as an example. t0 ,I th ,I max In addition, the duty cycle D = 5%, the frequency is the driving current corresponding to the representative frequency fre2; the duty cycle D = 10%, the frequency is the driving current corresponding to the representative frequency fre1; the duty cycle D = 10%, the frequency is the driving current corresponding to the representative frequency fre2; the duty cycle D = 20%, the frequency is the driving current corresponding to the representative frequency fre1; the duty cycle D = 20%, the frequency is the driving current corresponding to the representative frequency fre2.

[0109]

[0110] Table 3

[0111] In the embodiment of the present invention, the frequencies involved in the laser medical device can be segmented, thereby simplifying the workload of power calibration. Based on this, the above method also includes:

[0112] First, set the duty cycle of the laser to the first duty cycle and the frequency to the first frequency, adjust the current so that the average power output by the laser is the preset power, and record the current current value; with the current current value and the first duty cycle, adjust the frequency so that the average power output by the laser is the preset power, and record all frequency values ​​to obtain the frequency range.

[0113] Optionally, the preset power may be the minimum average power or the maximum average power of the laser; or, the preset power is the power within the tolerance of the minimum average power or the maximum average power of the laser. Exemplarily, the tolerance is 20%. In this embodiment, the operation is first fixed at a certain duty cycle and frequency, and the average power output is detected while adjusting the current to obtain the current corresponding to the preset power under this condition. In this embodiment, the operation is fixed at a certain duty cycle and current again, and the average power output is detected while adjusting the frequency to obtain all frequency values ​​that can output the above preset frequency, and the above frequency values ​​constitute a frequency interval.

[0114] Secondly, the duty cycle is changed and the above steps are repeated to obtain the frequency intervals of the laser at all duty cycles; each frequency interval corresponds to a representative frequency. By repeating the above steps, the frequency segmentation of the laser at all duty cycles can be obtained.

[0115] Then, the preset current-average power relationship is updated according to the first current value, the second current value, and the third current value at different duty cycles and different representative frequencies to obtain a corrected current-average power relationship. In this embodiment, the frequency adopts a method of multiple frequency intervals to simplify the power correction workload.

[0116] Figure 4 A logic schematic diagram of a method for automatically correcting laser power for suppressing relaxation oscillation provided by an embodiment of the present invention is shown, the method comprising:

[0117] S401, determine whether there is a large deviation between the peak power detected by the photodiode and the factory peak power. If yes, execute S402; if no, execute S403.

[0118] S402, prompting the user to perform the laser power automatic calibration process.

[0119] S403: Whether the user requests to perform the automatic power calibration process. If yes, execute S404; if no, return to execute S401.

[0120] S404, take out the first set of duty cycle data: (D1, f, P p_It0 ,P Ith ,P pmax ).

[0121] S405, determine whether all duty cycle data have been calibrated. If not, execute S406; if yes, execute S401.

[0122] S406, controlling the laser to output a frequency f, a duty cycle Dx, and a laser current of 0 mA.

[0123] S407, collect the analog to digital converter (ADC) data of the photodiode and determine whether it is equal to the factory P p_It0 The corresponding analog-to-digital conversion value. If yes, execute S408; if no, execute S409.

[0124] S408, save the current I at this time t0 .

[0125] S409, determine whether the ADC value is greater than the factory P p_It0 The corresponding analog-to-digital conversion value. If yes, execute S410; if no, execute S411.

[0126] S410, the driving current is reduced by 10mA.

[0127] S411, the driving current increases by 10mA.

[0128] S412, control the laser to output frequency f, duty cycle Dx, and laser current of 0mA.

[0129] S413, collect the ADC value of the photodiode and determine whether it is equal to the P value at the factory. pmax The corresponding analog-to-digital conversion value. If yes, execute S414; if no, execute S415.

[0130] S414, save the current I at this time max .

[0131] S415, determine whether the ADC value is greater than the factory P pmax The corresponding analog-to-digital conversion value. If yes, execute S416; if no, execute S417.

[0132] S416, the driving current is reduced by 10mA.

[0133] S417, the driving current increases by 10mA.

[0134] S418, control the laser to output frequency f, duty cycle Dx, and laser current of 0mA.

[0135] S419, collect the ADC value of the photodiode and determine whether it is equal to the P value at the factory. Ith The corresponding analog-to-digital conversion value. If yes, execute S420; if no, execute S421.

[0136] S420, save the current I at this time th .

[0137] S421, determine whether the ADC value is greater than the factory P IthThe corresponding analog-to-digital conversion value. If yes, execute S422; if no, execute S423.

[0138] S422, the driving current is reduced by 10mA.

[0139] S423, the driving current increases by 10mA.

[0140] S424, take out the next set of duty cycle data: (Dx, f, P p_It0 ,P Ith ,P pmax ).

[0141] S425, using the corrected driving current data to replace the factory driving current data.

[0142] S426, the machine's subsequent laser emission uses the new drive current data to calculate and output current.

[0143] The embodiment of the present invention adds an algorithm for automatic power correction of the device after leaving the factory, which can more reliably ensure the availability of the device.

[0144] In order to improve product reliability, the embodiment of the present invention further considers the influence of laser loss caused by the terminal handpiece and the space coupler on the calibration.

[0145] Exemplarily, the laser medical device can be divided into three parts: a laser module, a spatial coupler module and a laser terminal handpiece module. The power correction discussed in the above embodiment is only for the laser power output by the laser module, and the laser loss of the latter two modules will be considered below.

[0146] The embodiments of the present invention take into account that during use by users, especially in the use scenarios of laser medical devices, the "laser terminal handpiece module" that has been in contact with the patient needs to be replaced after treating each patient. Due to production process problems, it is basically impossible to ensure that the laser loss rate of each module is consistent. However, the laser loss rate of the "laser terminal handpiece module", or transmission efficiency, can be marked during production.

[0147] The power calibration method provided in the embodiment of the present invention reserves the input of the transmission efficiency of the "laser terminal handpiece module", which can be input when the customer replaces the handpiece. The embodiment of the present invention also reserves the input and storage of the coupling efficiency (transmission efficiency) of the "spatial coupling module" to take into account that the spatial coupling module may be replaced during equipment maintenance. In this case, it is only necessary to reset the transmission efficiency of the spatial coupling module without having to recalibrate the power of the laser.

[0148] In this way, when the device is required to receive the output average power set by the customer, when it is actually used to calculate the output current, it is necessary to add the set average power to the loss power of the "spatial coupler module" and the "laser terminal hand tool module" and then calculate the current.

[0149] Based on this, the above method may also include: obtaining the transmission efficiency of the space coupler module and the laser terminal hand tool module; determining the conversion relationship between the laser output average power and the actual output average power based on the transmission efficiency; updating the corrected current-average power relationship based on the conversion relationship to obtain the current-average power relationship after loss consideration. Exemplarily, the transmission efficiency of the space coupler module is 99%, and the transmission efficiency of the laser terminal hand tool module is 98%. The average power output based on the above corrected current-average power relationship is less than the average power required by the user due to the loss, so the current needs to be increased accordingly to compensate for the above loss.

[0150] In addition to the measured laser power output value, the embodiment of the present invention reserves compensation for the transmission efficiency of the coupler and the handpiece, thereby further ensuring the average laser power output by the terminal and providing a higher guarantee for the reliability of the product.

[0151] Figure 5 The structure diagram of a laser power automatic correction device for suppressing relaxation oscillation provided by an embodiment of the present invention is shown. The device is applied to a laser medical device, the laser medical device includes a photoelectric sensor, and the device includes:

[0152] The detection module 501 is used to obtain the actual peak power of the laser collected by the photoelectric sensor; the waveform of the driving current of the laser 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 the safety threshold;

[0153] The automatic correction module 502 is used to execute the power automatic correction process if the deviation between the actual peak power and the factory peak power is greater than a threshold; the power automatic correction process includes:

[0154] Setting the duty cycle and frequency of the laser, adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the first order, and recording the current first current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, and recording the current second current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, and recording the current third current value;

[0155] After changing the frequency, re-recording is performed to obtain the first current value, the second current value, and the third current value at different frequencies;

[0156] and re-recording after changing the duty cycle to obtain the first current value, the second current value, and the third current value under different duty cycles;

[0157] The preset current-average power relationship is updated according to the first current value, the second current value, and the third current value at different duty cycles and different frequencies to obtain a corrected current-average power relationship.

[0158] Optionally, the current-average power relationship is as follows:

[0159] I out =[(P out -P p_It0 *t0*fP Ith *D) / (P pmax *DP Ith *D)](I max -I th )+I th

[0160] 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.

[0161] Optionally, the laser medical device includes a laser module, a spatial coupler module and a laser terminal handpiece module, and the device also includes a loss correction module, which is used to: obtain the transmission efficiency of the spatial coupler module and the laser terminal handpiece module; determine the conversion relationship between the laser output average power and the actual output average power according to the transmission efficiency; update the corrected current-average power relationship based on the conversion relationship to obtain the current-average power relationship after considering the loss.

[0162] The laser power automatic 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 automatic correction method for suppressing relaxation oscillation provided in the above embodiments. To avoid repetition, they will not be described here.

[0163] 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.

[0164] 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.

[0165] 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 method for automatically correcting laser power for suppressing relaxation oscillation, characterized in that: Applied to a laser medical device, the laser medical device includes a photoelectric sensor, and the method includes: Acquiring the actual peak power of the laser collected by the photoelectric sensor; the waveform of the driving current of the laser 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 the safety threshold; If the deviation between the actual peak power and the factory peak power is greater than the threshold, the power automatic correction process is executed; the power automatic correction process includes: Setting the duty cycle and frequency of the laser, adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the first order, and recording the current first current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, and recording the current second current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, and recording the current third current value; After changing the frequency, re-recording is performed to obtain the first current value, the second current value, and the third current value at different frequencies; and re-recording after changing the duty cycle to obtain the first current value, the second current value, and the third current value under different duty cycles; The preset current-average power relationship is updated according to the first current value, the second current value, and the third current value at different duty cycles and different frequencies to obtain a corrected current-average power relationship.

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 method further comprises: If the average power set by the user is obtained, the average power set by the user is input into the corrected current-average power relationship to obtain the actual driving current, and the laser is driven according to the actual driving current.

4. The method according to claim 1, characterized in that: The laser medical device comprises a laser module, a space coupler module and a laser terminal hand tool module, and the method further comprises: Obtaining the transmission efficiency of the spatial coupler module and the laser terminal hand tool module; Determining the conversion relationship between the laser output average power and the actual output average power according to the transmission efficiency; The corrected current-average power relationship is updated based on the conversion relationship to obtain a current-average power relationship after loss is taken into account.

5. The method according to claim 1, characterized in that The method further comprises: 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; According to the current current value and the first duty cycle, the frequency is adjusted so that the average power output by the laser is the preset power, and all frequency values ​​are recorded to obtain a frequency interval; The duty cycle is changed, and the above steps are repeated to obtain the frequency intervals of the laser at all duty cycles; each of the frequency intervals corresponds to a representative frequency; The preset current-average power relationship is updated according to the first current value, the second current value, and the third current value at different duty cycles and different representative frequencies to obtain a corrected current-average power relationship.

6. The method according to claim 1, characterized in that The method further comprises: If a calibration request input by the user is received, the automatic power calibration process is executed.

7. A laser power automatic correction device for suppressing relaxation oscillation, characterized in that: Applicable to laser medical equipment, the laser medical equipment includes a photoelectric sensor, and the device includes: A detection module, used to obtain the actual peak power of the laser collected by the photoelectric sensor; the waveform of the driving current of the laser 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; The automatic correction module is used to execute the power automatic correction process if the deviation between the actual peak power and the factory peak power is greater than a threshold; the power automatic correction process includes: Setting the duty cycle and frequency of the laser, adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the first order, and recording the current first current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the maximum current, and recording the current second current value; and adjusting the current so that the actual peak power output by the laser is the peak power corresponding to the minimum current, and recording the current third current value; After changing the frequency, re-recording is performed to obtain the first current value, the second current value, and the third current value at different frequencies; and re-recording after changing the duty cycle to obtain the first current value, the second current value, and the third current value under different duty cycles; The preset current-average power relationship is updated according to the first current value, the second current value, and the third current value at different duty cycles and different frequencies to obtain a corrected current-average power relationship.

8. The device according to claim 7, 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.

9. The device according to claim 7, characterized in that The laser medical device comprises a laser module, a spatial coupler module and a laser terminal hand tool module, and the device also comprises a loss correction module for: Obtaining the transmission efficiency of the spatial coupler module and the laser terminal hand tool module; Determining the conversion relationship between the laser output average power and the actual output average power according to the transmission efficiency; The corrected current-average power relationship is updated based on the conversion relationship to obtain a current-average power relationship after loss is taken into account.

10. A laser, characterized in that: The invention comprises a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the method for automatically correcting the power of a laser for suppressing relaxation oscillation as claimed in any one of claims 1 to 6 is implemented.

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