Method and device for automatic correction of laser power to inhibit relaxation oscillations and laser

Abstract

The application provides a laser power automatic correction method and device for inhibiting relaxation oscillation and a laser, and relates to the technical field of laser power correction.The method comprises the following steps: acquiring actual peak power of the laser collected by a photoelectric sensor; if the deviation of the actual peak power and factory peak power is greater than a threshold value, executing a power automatic correction process; the power automatic correction process can update a preset current-average power relationship according to first, second and third current values under different duty cycles and different frequencies to obtain a corrected current-average power relationship.The embodiment of the application can independently judge whether the output power deviates and automatically corrects, is suitable for a pulse laser control mode of a small step signal for inhibiting relaxation oscillation, can improve the accuracy of the output power of the laser, and more reliably guarantees the availability of the equipment.

Description

TECHNICAL FIELD

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

[0002] After the laser is shipped, it will naturally age due to time and environment, and the current-peak power relationship in actual use will deviate from the specification described in the specification at the time of shipment, so power correction is needed to find the actual current-peak power relationship. The current laser power correction method will re-correct the relationship between the driving current and the power in the case of inaccurate average power output of the laser.

[0003] Taking a fiber laser as an example, relaxation oscillation will occur when the gain fiber generates laser, and if it is not suppressed, it will probably damage the optical components in the optical path, so 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 the driving current square wave to suppress the relaxation oscillation.

[0004] The current laser power correction method is to correct and calculate under the premise of square wave, and after adding the small step signal, there is more laser energy of the small step, which will cause the output laser average power to be larger according to the existing correction method, and it is unable to automatically find whether the deviation has occurred to cause long-term output power to be inaccurate. SUMMARY

[0005] To solve the above problems, the application provides a laser power automatic correction method for inhibiting relaxation oscillation, which is applied to a laser medical instrument, and the laser medical instrument comprises a photoelectric sensor, and the method comprises the following steps: acquiring actual peak power of a laser collected by the photoelectric sensor; a waveform of a driving current of the laser comprises a first order and a second order, an amplitude of the first order is smaller than that of the second order, and a current signal of the first order causes an amplitude of a laser relaxation oscillation waveform to be smaller than a safety threshold; if a deviation between the actual peak power and factory peak power is greater than a threshold, a power automatic correction process is performed; the power automatic correction process comprises the following steps: setting a duty cycle and a frequency of the laser, adjusting the current so that actual peak power output by the laser is a first-order corresponding peak power, recording a current first current value; and adjusting the current so that the actual peak power output by the laser is a peak power corresponding to a maximum current, recording a current second current value; and adjusting the current so that the actual peak power output by the laser is a peak power corresponding to a minimum current, recording a current third current value; after the frequency is changed, the first current value, the second current value and the third current value under each different frequency are re-recorded; after the duty cycle is changed, the first current value, the second current value and the third current value under each different duty cycle are re-recorded; and a preset current-average power relationship is updated according to the first current value, the second current value and the third current value under each different duty cycle and different frequency, so that a corrected current-average power relationship is obtained.

[0006] The embodiment of the application can autonomously judge whether the output power deviates and automatically correct, is suitable for a pulse laser control mode in which a small step signal for inhibiting relaxation oscillation is added, can improve the accuracy of laser output power, and more reliably guarantees the availability of equipment.

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

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

[0009] Wherein, I out is a current, P out is laser output average power, P p_It0 is the first-order peak power, t0 is the duration of the first order, f is a representative frequency, P Ith *D is the minimum average power, and 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 calibration of the laser.

[0011] Optionally, the method further includes: if an average power set by the 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 further 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 compensation for the transmission efficiency of the coupler and the handpiece, and there is no need to recalibrate the power of the laser, thereby further ensuring the average power of the laser output by the terminal and providing higher protection for the reliability of the product.

[0015] Optionally, the method further 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 under all duty cycles; each of the frequency intervals corresponds to a representative frequency; updating the preset current-average power relationship according to the first current value, the second current value, and the third current value under different duty cycles and different representative frequencies to obtain a corrected current-average power relationship.

[0016] The embodiment of the present application can segment the frequency involved in the laser medical instrument, thereby simplifying the power correction workload.

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

[0018] The embodiment of the present application can also perform the power automatic correction process based on the active request of the user, thereby improving the accuracy of the laser output power.

[0019] The embodiment of the present application provides a laser power automatic correction device for inhibiting relaxation oscillation, applied to a laser medical instrument, wherein the laser medical instrument comprises a photoelectric sensor, and the device comprises: a detection module, configured to acquire an actual peak power of a laser collected by the photoelectric sensor; a waveform of a driving current of the laser comprises a first order and a second order, an amplitude of the first order is less than an amplitude of the second order, and a current signal of the first order induces an amplitude of a laser relaxation oscillation waveform less than a safety threshold; an automatic correction module, configured to perform a power automatic correction process if a deviation between the actual peak power and a factory peak power is greater than a threshold; the power automatic correction process comprises: setting a duty cycle and a frequency of the laser, adjusting the current to make the actual peak power output by the laser be a first-order corresponding peak power, recording a current first current value; and adjusting the current to make the actual peak power output by the laser be a peak power corresponding to a maximum current, recording a current second current value; and adjusting the current to make the actual peak power output by the laser be a peak power corresponding to a minimum current, recording a current third current value; re-recording after changing the frequency to obtain the first current value, the second current value and the third current value under each different frequency; re-recording after changing the duty cycle to obtain the first current value, the second current value and the third current value under each different duty cycle; updating a preset current-average power relationship according to the first current value, the second current value and the third current value under each different duty cycle and different frequency, to obtain a corrected current-average power relationship.

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

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

[0022] wherein I out is the current, Pout P is the average power of the laser output p_It0 P is the peak power of the first order, t0 is the duration of the first order, f is the representative frequency, P Ith P is the minimum average power, D pmax P is the maximum average power, D pmax P is the peak power corresponding to the maximum current, D Ith P is the peak power corresponding to the minimum current, D is the duty cycle, I max I is the maximum current th I is the minimum current.

[0023] Optionally, the laser medical instrument includes a laser module, a spatial coupler module and a laser terminal hand tool module, and the device further includes a loss correction module configured to: acquire transmission efficiencies of the spatial coupler module and the laser terminal hand tool module; determine a conversion relationship between the average power of the laser output and an actual average power according to the transmission efficiencies; and update the corrected current-average power relationship based on the conversion relationship to obtain a current-average power relationship considering loss.

[0024] The embodiment of the present application provides a laser, which comprises a computer readable storage medium storing a computer program and a processor, and when the computer program is read and run by the processor, the above-mentioned laser power automatic correction method for suppressing relaxation oscillation is realized.

[0025] The laser power correction device for suppressing relaxation oscillation and the laser provided by the embodiment of the present application can realize the same technical effects as the above-mentioned laser power correction method for suppressing relaxation oscillation. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0027] Figure 1 The laser output power curve of the driving current and the laser diode in the embodiment of the present application;

[0028] Figure 2 The schematic diagram of the photoelectric sensor collecting laser signal provided by the embodiment of the present application;

[0029] Figure 3 The flowchart of the laser power automatic correction method for suppressing relaxation oscillation provided by the embodiment of the present application;

[0030] Figure 4 The logic diagram of the laser power automatic correction method for suppressing relaxation oscillation provided by the embodiment of the present application is shown in the figure.

[0031] Figure 5 The structural diagram of the laser power automatic correction device for suppressing relaxation oscillation provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0032] In order to make the above objectives, characteristics and advantages of the present application more apparent, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] The parameters involved in the embodiment of the present application 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] The patent 202410703660X describes a laser current control method for suppressing laser relaxation oscillation, which designs a small step current waveform to suppress relaxation oscillation. 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] Wherein, P out is the average power of laser output, 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 driving current, I th is the threshold current, P pmax is the peak power of laser corresponding to the maximum driving current, and D is the duty ratio corresponding to the second order.

[0037] One of the prerequisites of the above derivation formula is that, as described in the patent description, I thThe value selected 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, the threshold current I can be measured by using a laser power meter. th The average power of the laser output when driving the LD is very weak, so it is difficult to measure it, making it difficult to judge the I th Take the appropriate amount.

[0038] In order to solve the difficulties described above, 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 side is the current-laser peak power curve, and the upper side 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 based on 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 * f- P Ith *D ) / (P pmax *D - P 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_It0P 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 P is the peak power corresponding to the maximum current, P Ith P is the peak power corresponding to the minimum current, D is the duty cycle, I max I is the maximum current, I th I is the minimum current.

[0043] Based on Figure 1 As shown in formula 1, the derivation is as follows:

[0044] ∵BC⊥AC, ED⊥AC,

[0045] ∴ED∥BC

[0046] And ∵∠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 power correction is needed, only the corresponding I max and I th of each frequency segment and P pmax are needed to calculate the required current according to the P pset set by the screen; the peak power P Ith and the average power P aIth at this time have the following formula relationship:

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

[0055] D is the duty cycle, P aIth is the average power, P Ith It is now I 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 Equal to 0, at this time the P of the above formula 1 Ith The effect of is negligible, 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 power P that needs to be output 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 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] Furthermore, given formulas 1, 2, and 4,

[0064] ∴ I out = [(P Iout -PaIth ) / (P pmax *D - P aIth ) ] * (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, 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 achieved 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] 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 .

[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 the current regulation. t0， Because the current value and duration t0 of the small step that suppresses the damage of relaxation oscillation 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 components in the optical path), so P t0 is a constant. So as long as we calculate P t0 , you can get the regulated output current I outThe relationship between the average power P output by the laser device terminal and the current I is as follows: out

[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 average power P of the corresponding continuous mode is: t0_cw

[0072] P t0_cw =P p_It0

[0073] Since 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 the duty cycle is:

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

[0075] Since the average power of the laser output in the 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] Since P p_It0 can be obtained according to I t0 , t0 is a fixed value known during debugging, and P t0 is also a fixed value.

[0078] Therefore, formula 6 can be changed to the following form:

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

[0080] Based on the formula, the embodiment of the application designs a laser power automatic correction method for suppressing relaxation oscillation, which can be better applied to laser medical instruments. Exemplarily, the laser medical instrument includes a photoelectric sensor, which can collect laser signals in an optical path.

[0081] Figure 2 A schematic diagram of the photoelectric sensor collecting laser signals is shown. Laser in the optical path passes through a collimating mirror 21 and enters a beam splitter 21, which can reflect 1% of the laser from the main optical path to a photodiode sensor 22, and other laser transmits through the beam splitter 21 to a focusing mirror 23. A photodiode dustproof lens 24 is also arranged between the beam splitter 21 and the photodiode sensor 22.

[0082] Figure 3 A flowchart of a laser power automatic correction method for suppressing relaxation oscillation provided by the embodiment of the application is shown. The method includes:

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

[0084] As the foregoing method for suppressing relaxation oscillation, the waveform includes a first order and a second order, the amplitude of the first order is smaller than that of the second order, and the current signal of the first order induces a laser relaxation oscillation waveform with an amplitude smaller than a safety threshold. The safety threshold is affected by parameters of components in a laser driving circuit, and relaxation oscillation with an amplitude lower than the safety threshold will not damage components in the optical path.

[0085] The higher the driving current is, the higher the peak power generated by the laser diode is, thereby inducing a higher relaxation oscillation waveform in the early stage of laser balance establishment. When higher than a certain value, the optical device can be burned. The embodiment of the application uses a smaller first-order current to let the laser balance 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 the large current driving the laser diode will not induce a larger relaxation oscillation waveform. The amplitude of the relaxation oscillation waveform induced by the small step current is relatively small, within the acceptance range of the optical device in the optical path, thereby successfully avoiding damage of the relaxation oscillation to the optical device in the optical path.

[0086] S34, if the deviation of the actual peak power from the factory peak power is greater than a threshold, performing a power automatic correction process.

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

[0088] When the laser LD attenuation needs to be corrected, the corresponding current after attenuation can be obtained according to the power parameter at the factory.

[0089] Optionally, the power automatic correction process can also be performed based on the active request of the user in the embodiment. The method can further include: if a correction request input by the user is received, performing the power automatic correction process.

[0090] The power automatic correction process includes:

[0091] S341, setting the duty cycle and frequency of the laser, adjusting the current to make the actual peak power output by the laser be the peak power corresponding to the first order, recording the current first current value; and adjusting the current to make the actual peak power output by the laser be the peak power corresponding to the maximum current, recording the current second current value; and adjusting the current to make the actual peak power output by the laser be the peak power corresponding to the minimum current, recording the current third current value.

[0092] In the correction process, the output driving current is gradually adjusted. When the analog-to-digital conversion value of the photodiode sampling feedback is equal to the factory calibration value (the peak power of the first order, the minimum peak power, and the maximum peak power), the value of the current driving current is recorded, and the coordinates of the three points (I th ,P Ith ), (I max ,P pmax ) and (I t0 ,P p_It0 ) can be obtained.

[0093] S342, re-recording after changing the frequency, obtaining the first current value, the second current value, and the third current value under each different frequency.

[0094] Under the condition that the duty cycle is unchanged, the above-mentioned frequency is changed for correction, so as to obtain each of the above-mentioned current values under each different frequency.

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

[0096] The duty cycle is changed, and each of the above-mentioned current values under each different frequency is recorded for each duty cycle.

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

[0098] In the case of obtaining the coordinates of all the above (I th ,P Ith ), (I max ,P pmax ) and (I t0 ,P p_It0 ) three points, the coordinate relationship of the new three points replaces the coordinate relationship at the time of factory shipment, 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 attenuated laser medical instrument.

[0099] The laser power automatic correction method for suppressing relaxation oscillation provided by the embodiment of the application can autonomously judge whether the output power deviates and automatically correct, is suitable for the pulse laser control mode of small step signal increased to suppress relaxation oscillation, can improve the accuracy of the laser output power, and more reliably guarantees the availability of the equipment.

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

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

[0102] Wherein, I out is the current, P out is the average power of laser output, 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 correction, the laser is controlled to operate based on the corrected current- average power relationship. Based on this, the above method can further include: if the user sets the average power, input the user-set average power into the corrected current- average power relationship to obtain the actual driving current, and drive the laser 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] The laser medical instrument records the laser peak value, voltage value and driving current value of the above several points at the time of factory shipment, as shown in Table 2. In Table 2, the driving current corresponding to each power is exemplified with duty cycle D = 5%, frequency as representative frequency fre1. In addition, there are driving currents corresponding to duty cycle D = 5%, frequency as representative frequency fre2; duty cycle D = 10%, frequency as representative frequency fre1; duty cycle D = 10%, frequency as representative frequency fre2; duty cycle D = 20%, frequency as representative frequency fre1; duty cycle D = 20%, frequency as representative frequency fre2.

[0105]

[0106] Table 2

[0107] After performing the power automatic correction process, the coordinates of the three points (I th , P Ith ), (I max , P pmax ) and (I t0 , P p_It0 ) are obtained. Table 3 shows the decayed laser peak value, voltage value and driving current value.

[0108] In Table 3, the driving currents I t0 , I th , I max corresponding to each power after decay are exemplified with duty cycle D = 5%, frequency as representative frequency fre1. In addition, the driving currents corresponding to duty cycle D = 5%, frequency as representative frequency fre2; duty cycle D = 10%, frequency as representative frequency fre1; duty cycle D = 10%, frequency as representative frequency fre2; duty cycle D = 20%, frequency as representative frequency fre1; duty cycle D = 20%, frequency as representative frequency fre2 are also corrected.

[0109]

[0110] Table 3

[0111] The frequency involved in the laser medical instrument can be segmented in the embodiment of the application, so as to simplify the power correction workload. Based on this, the above method further comprises:

[0112] Firstly, the duty cycle of the laser is set as a first duty cycle, the frequency is set as a first frequency, the current is adjusted so that the average power output by the laser is a preset power, and the current value is recorded; the current value and the first duty cycle are used to adjust the frequency so that the average power output by the laser is the preset power, and all frequency values are recorded to obtain a frequency interval.

[0113] Alternatively, the preset power can be a minimum average power or a 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%. In this embodiment, the laser is fixed to operate at a certain duty cycle and frequency, the current is adjusted, and the average power output is detected to obtain the current corresponding to the preset power under the condition. In this embodiment, the laser is fixed to operate at a certain duty cycle and current, the frequency is adjusted, and the average power output is detected to obtain all frequency values capable of outputting the preset frequency, and the frequency values form a frequency interval.

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

[0115] Then, the first current value, the second current value and the third current value under different duty cycles and different representative frequencies are used to update the preset current-average power relationship to obtain a corrected current-average power relationship. In this embodiment, the frequency adopts the mode of multiple frequency intervals, so that the power correction workload can be simplified.

[0116] Figure 4 A logic diagram of a laser power automatic correction method for suppressing relaxation oscillation is shown, and the method comprises:

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

[0118] S402, the user is prompted to perform a laser power automatic correction process.

[0119] S403, whether the user requests to perform a power automatic correction process. If yes, S404 is executed; if no, S401 is returned to be executed.

[0120] S404, a first group of duty cycle data (D1, f, P p_It0 , PIth P pmax )。

[0121] S405, judge whether all the duty cycle data has been corrected. If not, execute S406; if yes, execute S401.

[0122] S406, control the laser output frequency f, duty cycle Dx, and the laser current is 0 mA.

[0123] S407, collect the analog to digital converter (ADC) data of the photodiode, and judge whether it is equal to the factory P corresponding analog to digital conversion value. If yes, execute S408; if not, execute S409. p_It0

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

[0125] S409, judge whether the ADC value is greater than the factory P corresponding analog to digital conversion value. If yes, execute S410; if not, execute S411. p_It0

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

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

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

[0129] S413, collect the ADC value of the photodiode, and judge whether it is equal to the factory P corresponding analog to digital conversion value. If yes, execute S414; if not, execute S415. pmax

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

[0131] S415, judge whether the ADC value is greater than the factory P corresponding analog to digital conversion value. If yes, execute S416; if not, execute S417. pmax

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

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

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

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

[0136] S420, save the current I th .

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

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

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

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

[0141] S425, replace the driving current data at the factory with the corrected driving current data.

[0142] S426, use the new driving current data for subsequent laser emission of the machine to calculate and output the current.

[0143] The embodiment of the present application increases the automatic power correction algorithm after the equipment leaves the factory, and can more reliably guarantee the availability of the equipment.

[0144] The embodiment of the present application further considers the influence of laser loss caused by the terminal handpiece and the spatial coupler on the correction in order to improve the product reliability.

[0145] Illustratively, the laser medical instrument 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 following will consider the laser loss of the last two modules.

[0146] The embodiment of the present application considers that in the process of use by the user, especially in the use scenario of the laser medical instrument, the "laser terminal handpiece module" that has been in contact with the patient needs to be replaced after treating each patient. Due to the production process, the laser loss rate of each module cannot be consistent, but the laser loss rate of the "laser terminal handpiece module", or the transmission efficiency, can be marked during production.

[0147] The power calibration method provided in this embodiment of the present invention reserves the transmission efficiency input for the "laser terminal handpiece module," which can be input when the customer replaces the handpiece. This embodiment of the present invention also reserves the coupling efficiency (transmission efficiency) input of the "spatial coupling module" to account for the possibility of replacing the spatial coupling module during equipment maintenance. In this case, only the transmission efficiency of the spatial coupling module needs to be reset, eliminating the need to recalibrate the laser power.

[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 "space coupler module" and the "laser terminal handpiece module" and then calculate the current.

[0149] Based on this, the method may further include: obtaining the transmission efficiency of the spatial coupler module and the laser terminal handpiece module; determining a 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 a current-average power relationship that accounts for losses. For example, if the transmission efficiency of the spatial coupler module is 99% and the transmission efficiency of the laser terminal handpiece module is 98%, then the average power output based on the corrected current-average power relationship is less than the average power required by the user due to losses, and the current needs to be increased accordingly to compensate for the losses.

[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 higher protection for product reliability.

[0151] Figure 5 The present invention provides a schematic structural diagram of an automatic laser power correction device for suppressing relaxation oscillations, which is applied to a laser medical device. The laser medical device includes a photoelectric sensor and includes:

[0152] A detection module 501 is configured 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 first order current signal is smaller than a safety threshold;

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

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

[0155] Re-recording after changing the frequency, obtaining the first current value, the second current value and the third current value under each different frequency;

[0156] Re-recording after changing the duty cycle, obtaining the first current value, the second current value and the third current value under each different duty cycle;

[0157] Updating the preset current-average power relationship according to the first current value, the second current value and the third current value under each different duty cycle and different frequency, obtaining the corrected current-average power relationship.

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

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

[0160] Wherein, I out is current, P out is average power of laser output, 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 duty cycle, I max is maximum current, I th is minimum current.

[0161] Optionally, the laser medical instrument comprises a laser module, a spatial coupler module and a laser terminal handpiece module, and the device further comprises a loss correction module configured to: acquire transmission efficiencies of the spatial coupler module and the laser terminal handpiece module; determine a conversion relationship between the laser output average power and the actual output average power according to the transmission efficiencies; and update the corrected current-average power relationship based on the conversion relationship to obtain a current-average power relationship considering loss.

[0162] The laser power automatic correction device and the laser for suppressing relaxation oscillation provided by the embodiments of the present application can achieve the same technical effects as the laser power automatic correction method for suppressing relaxation oscillation provided by the above embodiments, and thus, the same will not be described here again.

[0163] Although the present application is disclosed as above, the present application 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 application, and thus, the protection scope of the present application should be defined by the scope defined by the claims.

[0164] Finally, it should be noted that, in the present document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0165] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for automatically correcting laser power to suppress 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 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 first current value; 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; and changing the frequency and re-recording to obtain the first current value, the second current value, and the third current value at different frequencies; and changing the duty cycle and re-recording to obtain the first current value, the second current value, and the third current value under different duty cycles; Updating a 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; 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.

2. 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 an actual driving current, and the laser is driven according to the actual driving current.

3. The method according to claim 1, characterized in that The laser medical device includes a laser module, a space coupler module and a laser terminal handpiece module, and the method further includes: Obtaining the transmission efficiency of the spatial coupler module and the laser terminal handpiece module; Determining a 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.

4. The method according to claim 1, wherein 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; Adjusting the frequency so that the average power output by the laser is the preset power based on the current current value and the first duty cycle, and recording all frequency values ​​to obtain a frequency interval; Changing the duty cycle and repeating the above steps to obtain frequency intervals of the laser at all duty cycles; each frequency interval 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.

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

6. A laser power automatic correction device for suppressing relaxation oscillation, characterized in that: Applicable to a laser medical device, the laser medical device includes a photoelectric sensor, and the device includes: a detection module for 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 first order current signal is smaller than a safety threshold; The automatic correction module is configured to execute an automatic power correction process if the deviation between the actual peak power and the factory peak power is greater than a threshold value; the automatic power 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; 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; and changing the frequency and re-recording to obtain the first current value, the second current value, and the third current value at different frequencies; and changing the duty cycle and re-recording to obtain the first current value, the second current value, and the third current value under different duty cycles; Updating a 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; 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.

7. The device according to claim 6, characterized in that The laser medical device includes a laser module, a spatial coupler module and a laser terminal handpiece module. The device also includes a loss correction module for: Obtaining the transmission efficiency of the spatial coupler module and the laser terminal handpiece module; Determining a 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.

8. 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 method for automatically correcting the laser power for suppressing relaxation oscillation according to any one of claims 1 to 5 is implemented.

Images