CN104184035A - Laser control method - Google Patents
Laser control method Download PDFInfo
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- CN104184035A CN104184035A CN201410480462.8A CN201410480462A CN104184035A CN 104184035 A CN104184035 A CN 104184035A CN 201410480462 A CN201410480462 A CN 201410480462A CN 104184035 A CN104184035 A CN 104184035A
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Abstract
The invention discloses a laser control method. The method comprises the following steps of controlling a pulse signal and a power signal to conduct charging and injecting a guiding light pulse after charging is completed, wherein the guiding light pulse is used for taking away energy injected in the charging process. By the adoption of the scheme, the guiding light pulse is injected when the charging is completed, and the guiding light pulse can take away all the injected energy to guarantee that the energy of all pulses are consistent at the beginning and at the end so that optical pulses can be amplified and controlled one by one; consequently, the drop points of the pulses are effectively controlled.
Description
Technical field
The present invention relates to laser technology, in particular, a kind of laser control method.
Background technology
Laser output device comprises laser, laser equipment and instrument that can Output of laser, system etc. that can Output of laser, and wherein, solid state laser is the laser as operation material with solid laser material.Solid state laser is generally made up of parts such as working-laser material, driving source, laser pump cavity, cavity mirror and power supplys.
Fiber laser is the one of solid state laser, it comprises the laser as gain media with doped rare earth element glass optical fiber, be to develop on the basis of fiber amplifier, it has following advantage compared with conventional laser: cost is low, miniaturization, pumping do not need strict phase matched, waveguiding structure, loss is low, conversion efficiency is high, threshold values is low, Output of laser wavelength is many, tunable etc.Fiber laser has been applied to every field at present, comprises optical-fibre communications, the long distance communication of laser space, industrial shipbuilding, automobile making, laser engraving laser marking laser cutting, printing roller processed, metal and nonmetal boring/cutting/welding, military and national defense safety, medicine equipment instrument and equipment, large foundation construction etc.
At present, fiber laser has single-ended pumping, two kinds of both-end pumpings, and it is very high that the latter's power can reach, and high power laser is all pulsed output conventionally.Doubly clad optical fiber becomes a reality the making of high-power fiber laser and high-power image intensifer.Pulsewidth is adjustable MOPA(Master Oscillator Power Amplifier, master control concussion fiber amplifier) type pulse optical fiber has the advantages such as pulse duration is adjustable, high-peak power, repetition rate is high, switching speed is fast.MOPA type fiber laser is made up of master oscillator (MO) and power amplifier (PA) two parts, and its intermediate power amplifier can have multistage.
Such laser can be in continuous or pulse mode work, but a few thing medium can not bear continuous pumping, so can only be with pulse mode work.In the time that laser is worked with pulse mode, can be in abrupt release huge energy, make metallic material local evaporation, thereby complete punching, the work such as cutting.
For example, a pulse laser, pulse energy is 0.14mJ/ time, each pulsewidth 20ns, pulse frequency 100kHz, average power is: 0.14mJ X 100k=14J/s=14W, average power is 14 watts; Peak power is each pulse energy and the ratio of pulsewidth, i.e. peak power: 0.14mJ/20ns=7000W=7kW, and peak power is 7 kilowatts.
But, existing pulse optical fiber, pulse is realized to control according to pulse combined of a sequence, what control is same group and continuous multiple pulses, the pulse of whole group is amplified and controlled, pulse in the beginning of pulse train and the pulse of end position and intermediate stable is not identical, has certain difference on power; And not accurate control of the signal sequence of pulse and beginning mark, cause repeating can not to allow pulse drop on same point while beating same image.
Solve above-mentioned pulse drop point problem, existing method is, for each machine, in the time controlling its marking different images, regulates the time delay of controlling software, this method length consuming time, and consistency is also bad, inefficiency.
About pulse energy inconsistence problems, existing method is, regulates the sequential of several parts to solve at machine intimate by software, and this method is also unreliable, and the reliability of machine is had to certain influence, and client uses inconvenience.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new laser control method.
Technical scheme of the present invention is as follows: a kind of laser control method, it comprises the following steps: S20, control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.
Preferably, in described laser control method, in step S20, Synchronization Control pulse and power signal fill energy.
Preferably, in described laser control method, in step S20, independent control impuls and power signal fill energy respectively.
Preferably, in described laser control method, in Active Optical Fiber, perform step S20.
Preferably, in described laser control method, according to point wavelength that described guiding light pulse is set that is doping to of described Active Optical Fiber.
Preferably, in described laser control method, in step S20, described fill can before also execution step: S21, according to the length of described Active Optical Fiber, arranges Implantation Energy.
Preferably, in described laser control method, in step S20, according to described Implantation Energy, described guiding light pulse is set.
Preferably, in described laser control method, in step S20, inject described guiding light pulse filling before finishing.
Preferably, in described laser control method, before step S20, carry out following steps: S10, according to Laser output, obtain its pulse and power signal.
Preferably, in described laser control method, adopt field programmable gate array to carry out described control.
Adopt such scheme, the present invention injects guiding light pulse filling can finish time, and guiding light pulse meeting is all taken away the energy of injection, guarantee to start when finishing each pulse energy consistent, thus effective control impuls drop point.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of one embodiment of the invention.
Embodiment
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.In accompanying drawing, provide preferred embodiment of the present invention.But the present invention can realize in many different forms, be not limited to the described embodiment of this specification.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when element is called as " being fixed on " another element, it can be directly on another element or also can have an element placed in the middle.When an element is considered to " connection " another element, it can be directly connected to another element or may have centering elements simultaneously.Term " vertical ", " level ", " left side ", " right side " and similar statement that this specification uses are just for illustrative purposes.
Unless otherwise defined, all technology that this specification uses are identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in specification of the present invention in this specification, just in order to describe the object of specific embodiment, is not for limiting the present invention.The term "and/or" that this specification uses comprise one or more relevant Listed Items arbitrarily with all combinations.
The invention solves the accurate control problem of light pulse, can realize the control one by one of Optical pulse amplification; Can be applicable to the occasion of various light amplification.A kind of laser control method, comprises the following steps: S20, control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.Preferably, control impuls and power signal fill energy one by one.Preferably, occurring before amplified spontaneous emission, to inject described guiding light pulse, for example, before filling can finish time and amplified spontaneous emission is occurring, injecting a guiding light pulse, for take away fill can time the energy that injects.Like this, same at the pulsion phase of the beginning of pulse train and the pulse of end position and intermediate stable, on power, be consistent, make light pulse can amplify one by one control, thereby solved pulse drop point problem and pulse energy inconsistence problems.Wherein, described pulse refers to each pulse in pulse train, does not comprise guiding light pulse; Guiding light pulse is independent of described pulse train.For example, in step S20, each pulse in control impuls sequence and power signal fill can, filling can finish time and before there is amplified spontaneous emission, inject a guiding light pulse, for take away fill can time the energy that injects.And for example, in step S20, according to described pulse train control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.
Preferably, in described laser control method, in step S20, Synchronization Control pulse and power signal fill energy.Or in step S20, independent control impuls and power signal fill energy respectively.This fills can (Pump also claims pumping) not necessarily synchronous, that is to say, is that pulse and power can independently control in time can synchronously also can be asynchronous; Preferably, Synchronization Control pulse and power signal fill energy, can obtain so good control effect.Preferably, in described laser control method, adopt field programmable gate array (FPGA) to carry out described control.For example, adopt field programmable gate array to carry out described Synchronization Control.Like this, based on FPGA control core, be mainly used in pulse optical fiber industry, can realize accurate mark, engraving, cutting; Thereby can be as accurate as the control of each pulse, so that the image of marking is more accurate, cutting is more neat.
Preferably, in described laser control method, in Active Optical Fiber, perform step S20.For example,, according to point wavelength that described guiding light pulse is set that is doping to of described Active Optical Fiber; Preferably, taking the wavelength of the guiding light pulse of an empirical value as benchmark, point dynamically adjust up and down 2% to 5% according to described being doping to.Wherein, the guiding wavelength of light pulse system relevant to the doping composition of Active Optical Fiber, is 1062 to 1067nm such as mixing the wavelength of guiding light pulse of Active Optical Fiber use of ytterbium, and preferably, the wavelength of mixing the guiding light pulse of the Active Optical Fiber use of ytterbium is 1064nm.And for example, select the wavelength of the guiding light pulse of the Active Optical Fiber use of the doping compositions such as neodymium-doped according to experimental result.
Preferably, in step S20, described fill can before also execution step: S21, according to the length of described Active Optical Fiber, arranges Implantation Energy.For described length, there is no in theory any restriction, for example select the Active Optical Fiber of 2-4 rice, generally due to the impact of stimulated Brillouin scattering (SBS), can be not oversize when high power.Preferably, according to described Implantation Energy, described guiding light pulse is set.
Preferably, in described laser control method, in step S20, inject described guiding light pulse filling before finishing.For example, after step S21, also perform step S22: described in calculating, fill the energy time; And, in step S20, can the time according to described filling, filling can finish time, inject described guiding light pulse; And for example, this guiding light pulse, as long as injected before there is ASE, is filled and can conventionally still be had the time difference of several milliseconds to there is ASE afterwards.Preferably, fill can finish with ASE occur before time period in, inject described guiding light pulse.Preferably, at the mid point of time period filling before finishing to occur with ASE, inject described guiding light pulse.
Preferably, in described laser control method, before step S20, carry out following steps: S10, according to Laser output, obtain its pulse and power signal.For example, as shown in Figure 1, a kind of laser control method, comprise the following steps: according to Laser output, obtain its pulse and power signal, control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.Preferably, in step S20, according to waveform, frequency, duty ratio and change-over time that described guiding light pulse is set the waveform of described pulse, frequency, duty ratio and change-over time.Preferably, in step S10, read the file of described Laser output, obtain its pulse and power signal.Preferably, in step S10, also perform step S11: according to the information of described guiding light pulse, pulse and power signal described in pre-adjustment.For example, postpone to arrange described pulse.Like this, when guiding light pulse is definite, can finely tune or revise described pulse and power signal.
For example, an example is, a kind of laser control method, comprise the following steps: according to Laser output, obtain its pulse and power signal, asynchronous control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.Another example is, a kind of laser control method, comprise the following steps: according to Laser output, obtain its pulse and power signal, Synchronization Control pulse and power signal fill can, filling can finish time and before there is amplified spontaneous emission, inject a guiding light pulse, for take away fill can time the energy that injects.Another example is that a kind of laser control method, comprises the following steps: the file that reads Laser output, obtain its pulse and power signal, control impuls and power signal fill can, before filling and finishing, inject a guiding light pulse, the energy injecting while filling energy for taking away.
Preferably, after step S20, also perform step S30: upload and fill energy record.Preferably, before step S10, also perform step S01: obtain and fill energy record, judge whether it exceedes preset value, is to lock, and no longer carries out subsequent step, comprise step S10 and/or step S20.Preferably, step S01 carries out in the time that laser starts.Preferably, after step S01, also perform step S02, obtain control information, judge whether it comprises lock instruction, is to lock, and no longer carries out subsequent step; Like this, laser producer or management organization just can this lasers of telemanagement, effectively carry out user or instrument management, stop illegal use or non-normal use laser, are particularly suitable for rental service, especially the management of company's existing product.
And for example, one embodiment of the present of invention are, in described laser control method, and each pulse in described pulse train, comprise a sub-pulse train,, each pulse includes a sub-pulse train, wherein has several subpulses, in other words, pulse described in employing subpulse sequence replacing, wherein, described subpulse sequence comprises some subpulses.Like this, after step S20, can output packet containing the pulse train of some subpulses, the pulse of being exported to substitute prior art, like this, originally the characteristic of a pulse is replaced by the characteristic of a set of pulses, thereby can be flexibly Output of laser effectively.Like this, go for various material and technique, continue or be interrupted Output of laser, make the scope of application of laser more extensive, be not limited to metal processing or plastic processing.For example, in the time that laser output is exported described subpulse sequence, first read the control documents that comprises described subpulse sequence, then export described subpulse sequence according to described control documents; Preferably, adopt computer to set in advance some subpulse sequences, the unified control documents that generates, described laser output is according to the each described subpulse sequence of described control documents Sequential output, in each described subpulse sequence, the subpulse that described in each, subpulse sequence comprises some different width, and/or, the subpulse that at least one described subpulse sequence comprises some different width.
Or, for prior art, by each pulse in its pulse output, adopt identical or different subpulse sequence replacing, for example, wherein, each subpulse sequence comprises some identical or different subpulses; For example, for prior art, by each pulse in pulse output, adopt an identical subpulse sequence replacing, for example, each subpulse sequence comprises some identical or different subpulses; And for example, by each pulse in pulse output, adopt an identical subpulse sequence replacing; Preferably, described subpulse sequence comprises the identical or different subpulse of some width, and for example, in described subpulse sequence, the width of at least one subpulse and the width of other subpulse are different; And for example, the subpulse that described subpulse sequence comprises some different width.Preferably, described subpulse sequence comprises the identical or different subpulse of some frequency, and for example, in described subpulse sequence, the frequency of at least one subpulse and the frequency of other subpulse are different; And for example, described subpulse sequence comprises the subpulse of some distinct frequencies.For example, by the pulse of the square wave one by one of prior art, each square wave replaces to a sub-pulse train, wherein comprises some subpulses.And for example, by the pulse of the triangular wave one by one of prior art, each triangular wave replaces to a sub-pulse train, wherein comprises the subpulse of some different width.Like this, after substituting, originally the characteristic of a pulse is replaced by the characteristic of a set of pulses, and naturally, its feature is just more, so application more has superiority.Like this, go for various material and technique, continue or be interrupted Output of laser, make the scope of application of laser more extensive, be not limited to metal processing or plastic processing.Preferably, described laser output is in the time of output subpulse sequence, judge whether it comprises the subpulse of some different width, it is the subpulse sequence of exporting different width subpulse, otherwise the subpulse sequence of output same widths subpulse, be similar to present mode and carry out Laser output, but each pulse has made a sub-pulse train into.Preferably, described laser output arranges subpulse recognition sequence pattern, in the time of output subpulse sequence, judge whether it comprises the subpulse of some different width, be to adopt different width subpulse sequence pattern to export the subpulse sequence of different width subpulse, otherwise adopt the subpulse sequence of same widths subpulse sequence pattern output same widths subpulse, like this, for laser, its control mode is optimized.
Preferably, in described laser output method, in step S30 or afterwards, also carry out following steps: S31, add up total duration of described laser output Output of laser; For example, in step S30, when Output of laser, according to width and the frequency of each subpulse in described subpulse sequence, calculate the duration of this Output of laser, meanwhile, add up total duration of described laser output Output of laser.Preferably, in described laser output method, in step S30 or afterwards, also carry out following steps: S32, upload the duration of this Output of laser of described laser output; For example, in step S30, when Output of laser, according to width and the frequency of each subpulse in described subpulse sequence, calculate the duration of this Output of laser, meanwhile, upload the duration of this Output of laser of described laser output.For example, preferred, in step S30 or afterwards, also carry out following steps S03: when Output of laser, according to width and the frequency of each subpulse in described subpulse sequence, calculate the duration of this Output of laser; S31, adds up total duration of described laser output Output of laser; S32, uploads the duration of this Output of laser of described laser output.
For example, in step S03, record the duration of the each Output of laser of described laser output device; Then, the total duration of output of the described laser output device Output of laser of accumulative total.Preferably, before step S03, total duration is safeguarded in the output of default described laser output device Output of laser; In step S03, judge that the total duration of described output is greater than described output and safeguards total duration, lock described laser output device, stop Output of laser.Preferably, while stopping Output of laser, feedback locking information, preferred, also feedback processing suggestion; Preferably, go back feedback alarm information.
Preferably, described laser output method is further comprising the steps of: S001, when described laser output device starts or occurrence positions changes, obtains himself positional information record; For example, when described laser output device starts, obtain himself positional information record; Or, when described laser output device starts, judge whether change of self-position, be to obtain himself positional information record; Described record comprises and is cached in interim memory body and is stored in permanent memory body.Like this, laser output device self can have a recorded information to its position.Preferably, after step S001, also carry out following steps: S002, described positional information is uploaded to default server; Upload to be included in after obtaining positional information and immediately upload to default server, or at a certain default uplink time, will in each position information set of obtaining before, upload to default server.Preferably, upload in real time, for example, when each described laser output device starts or occurrence positions changes, obtain himself positional information record, then described positional information is uploaded to default server; And for example, when described laser output device starts at every turn, judging whether change of self-position, is to obtain himself positional information record, then described positional information is uploaded to default server, otherwise does not upload; Or timing is uploaded, when described laser output device starts at every turn, the certain hour that judged whether interval, for example 1 hour, 5 hours or 10 hours etc., be to obtain himself positional information record, then described positional information uploaded to default server; Concrete position acquisition mode, can realize with reference to modes such as existing GPS location, big-dipper satellite location, is omitted at this.Preferably, after step S002, also carry out following steps: S003, according to each described positional information, export the time location track of described laser output device; For example, on output time location track figure road user or keeper's mobile phone, mailbox, or output to server.
For example, when described laser output device Output of laser, carry out following steps S020: obtain quantity and the width of subpulse, calculate the duration of this Output of laser; Wherein, width is the width of subpulse, i.e. subpulse width, from academic angle, be exactly the time width of electric current or voltage regular variation in time, the waveform of pulse comprises square wave, triangular wave, sawtooth waveforms, SIN function ripple etc., the variation of these waveforms, all has certain rule; For example, pulse duration is not generally said in square wave the inside, but says duty ratio, the time that pulse takies in one section of stream time and the ratio of total time; Can determine the output time of pulse according to this width.Like this, can accurately calculate the correct time of Laser output, in other words, only just timing in Laser output, does not calculate the intermittent phase.
And for example, when described laser output device Output of laser, record Output of laser time point; Then, when described laser output device stops exporting, record stops output time point, according to described Output of laser time point with described in stop output time point, calculate the duration of this Output of laser; Like this, the All Time of Laser output be can calculate, the crest of pulse and the All Time of trough comprised.Then also add up the total duration of output of described laser output device Output of laser.Like this, can be in Output of laser, obtain the duration of this Output of laser and the total duration of output of accumulative total Output of laser.For example, adopt a timer, start timing in the time of each Output of laser, preferred, timing output timing result, for example, exported a timing result every 5 seconds kinds, 10 seconds, 30 seconds or 1 minute; And for example, export in real time timing result, it should be noted that, described " in real time " need to, according to the performance setting of system, for example, feed back a timing result for per second, every 1/2 second, every 1/10 second or every 1/100 second; Like this, can obtain in time the current output duration of this Output of laser and the total duration of output of accumulative total Output of laser.Preferably, also by output total duration real-time report laser output device or its control system or the server of above-mentioned current duration and accumulative total Output of laser.For example, described laser output device is laser, especially fiber laser, or described laser output device is laser equipment etc.
Preferably, when described laser output device Output of laser, also record the operation file information of Output of laser; Preferably, record after described operation file information, also upload to default server; Preferably, described operation file information comprises the Output of laser time; Like this, can effectively carry out time management to described laser output device, for example, when export what operation file, lasting output time how long etc.; Thereby can understand and the output of laser output device described in subsequent control at server end.Time management method particularly, can control with reference to existing office software, network software, and various embodiments of the present invention are not restricted this.
Preferably, in the time of described laser output device Output of laser, record Output of laser time point, also read the total duration of described output, like this, can directly obtain the total duration information of current output in conjunction with the described laser output device Output of laser of historical record; If Output of laser or there is no the total duration of described output for the first time, for example the person of being managed empties data etc., returns to null value or zero, and the total duration of described output is zero.Like this, can be in real time or the total duration of output of laser output device Output of laser described in timing acquisition, without waiting for that described laser output device stops output.
Various embodiments of the present invention by injecting enough energy in the Active Optical Fiber of appropriate length, there is ASE(Amplified Spontaneous Emission at it, amplified spontaneous emission) before, before the spontaneous transition radiation of atomic nucleus peripheral electron, inject a light pulse for guiding, but become the high energy pulse of equal width the increase of output power after pulse absorb energy, the principle of Here it is fiber laser; The at present control of optical fiber machine be mainly keep pulse and only control filling of amplifying stage can, thereby control power output, and in the present invention, by pulse and power signal Synchronization Control, first starting to fill can, inject guiding light pulse filling can finish time, pilot pulse can all be taken away the energy of injection, guarantees to start when finishing each pulse energy consistent.
Further, embodiments of the invention also comprise, each technical characterictic of the various embodiments described above, the laser control method being mutually combined to form, the control method that this Pulse by Pulse amplifies, can solve pulse drop point problem and pulse energy inconsistence problems, make the energy of each pulse and the sequential of relative other signals independent controlled, thereby can accomplish pulse energy one make peace pulse repeat drop point consistent, thereby improve the quality of institute's marking image, greatly promote the fineness of target product, be specially adapted to high-grade high-quality product.
It should be noted that, above-mentioned each technical characterictic continues combination mutually, forms the various embodiment that do not enumerate in the above, is all considered as the scope that specification of the present invention is recorded; And, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. a laser control method, is characterized in that, comprises the following steps:
S20, control impuls and power signal fill can, filling can finish time, inject a guiding light pulse, for take away fill can time the energy that injects.
2. laser control method according to claim 1, is characterized in that, in step S20, Synchronization Control pulse and power signal fill energy.
3. laser control method according to claim 1, is characterized in that, in step S20, independent control impuls and power signal fill energy respectively.
4. according to the arbitrary described laser control method of claims 1 to 3, it is characterized in that, in Active Optical Fiber, perform step S20.
5. laser control method according to claim 4, is characterized in that, according to point wavelength that described guiding light pulse is set that is doping to of described Active Optical Fiber.
6. laser control method according to claim 5, is characterized in that, in step S20, described fill can before execution step also: S21, according to the length of described Active Optical Fiber, arranges Implantation Energy.
7. laser control method according to claim 6, is characterized in that, in step S20, according to described Implantation Energy, described guiding light pulse is set.
8. laser control method according to claim 7, is characterized in that, in step S20, injects described guiding light pulse filling before finishing.
9. laser control method according to claim 8, is characterized in that, before step S20, carries out following steps: S10, according to Laser output, obtains its pulse and power signal.
10. laser control method according to claim 9, is characterized in that, adopts field programmable gate array to carry out described control.
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Application publication date: 20141203 |