CN103825179A - Pulse-waveform-adjustable optical fiber laser device and modulation method thereof - Google Patents
Pulse-waveform-adjustable optical fiber laser device and modulation method thereof Download PDFInfo
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- CN103825179A CN103825179A CN201410110160.1A CN201410110160A CN103825179A CN 103825179 A CN103825179 A CN 103825179A CN 201410110160 A CN201410110160 A CN 201410110160A CN 103825179 A CN103825179 A CN 103825179A
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Abstract
The invention discloses a pulse-waveform-adjustable optical fiber laser device and a modulation method thereof. The pulse-waveform-adjustable optical fiber laser device comprises an input interface, a micro processor and a digital-analog conversion chip, wherein the input interface inputs a square wave signal to the micro processor; the micro processor processes the square wave signal and then outputs data to the digital-analog conversion chip; the digital-analog conversion chip performs digital-analog conversion and then outputs a modulation signal. By adopting the scheme, the pulse-waveform-adjustable optical fiber laser device is high in speed and can program any waveform, so that the laser device is diversified in waveform, and the phenomenon that the performance of the laser device is reduced because of seed source single square waves is avoided; the output characteristic and the stability of the laser device are improved; the laser device and the output thereof are stable, and the performance is excellent; the laser device can diversify the waveform under the same pulse width; the performance of the laser device is improved, the laser processing range is large, and the pulse-waveform-adjustable optical fiber laser device has a good market application value.
Description
Technical field
The present invention relates to pulse optical fiber, in particular, the fiber laser that a kind of impulse waveform is adjustable and modulator approach thereof.
Background technology
Fiber laser 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 (brazing, hardening, covering and degree of depth welding etc.), military and national defense safety, medicine equipment instrument and equipment, large foundation construction etc.
Doubly clad optical fiber becomes a reality the making of high-power fiber laser and high-power image intensifer.Since Snitzer in 1988 describes cladding-pump fiber laser first, cladding pumping technology has been widely applied to the field such as fiber laser and fiber amplifier, becomes the first-selected approach of high-capacity optical fiber laser of making.The cladding pumping technology of fiber laser, is made up of four levels: fiber cores, inner cladding, surrounding layer and protective layer; Pump is coupled light to inner cladding by it, and light carrys out back reflective between inner cladding and surrounding layer, is repeatedly absorbed through fiber core with single-mold.The optical fiber of this structure is without requiring only single-mode laser of pump, and can be to the overall length pumping of optical fiber, therefore can select powerful multimode laser diode array to make pumping source, about more than 70% pump energy is coupled in fibre core indirectly, greatly improve pumping efficiency.
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.The MO of fiber laser is the LD(seed source of directly modulating), the waveform modulated of seed source is used square-wave frequency modulation in scheme in the past always, and square-wave frequency modulation can make the performance of laser reduce, the range limited system of laser processing.
And in order to protect laser, the seed source laser driver module of existing square wave can allow laser peak power too high and burn up fibre, or reduces the performance of laser, reduces single pulse energy.
But existing fiber laser is not often taked other implementations because square-wave frequency modulation is convenient.Therefore, there is defect in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new impulse waveform adjustable fiber laser and modulator approach thereof.
A technical scheme of the present invention is as follows: the fiber laser that a kind of impulse waveform is adjustable, and it comprises input interface, microprocessor and analog-digital chip; Described input interface input square-wave signal is to described microprocessor; Described microprocessor is processed rear output data to described analog-digital chip; Described analog-digital chip carries out exporting modulation signal after digital-to-analogue conversion.
Preferably, described fiber laser also comprises seed source laser, and it is connected with described analog-digital chip; Described analog-digital chip carries out exporting modulation signal to described seed source laser after digital-to-analogue conversion.
Preferably, described fiber laser also comprises metal oxide semiconductor transistor, and it is arranged between described analog-digital chip and described seed source laser; Described analog-digital chip carries out exporting modulation signal to described metal oxide semiconductor transistor after digital-to-analogue conversion, carries out linear current amplification by it, outputs to described seed source laser.
Preferably, described fiber laser also comprises the waveform shaping circuit, constant-current drive circuit and the seed source laser that are linked in sequence.
Preferably, described fiber laser also comprises DC protection circuit; Described waveform shaping circuit also connects the input of described DC protection circuit, and the output of described DC protection circuit connects the input of described constant-current drive circuit.
Preferably, described fiber laser also comprises current foldback circuit; The output of described constant-current drive circuit also connects the input of described current foldback circuit; The output of described current foldback circuit connects the input of described constant-current drive circuit.
Preferably, described fiber laser also comprises missing pulse protective circuit; The output of described constant-current drive circuit also connects the input of described missing pulse protective circuit; The output of described missing pulse protective circuit connects the input of described constant-current drive circuit.
Another technical scheme of the present invention is as follows: the modulator approach of the fiber laser that a kind of impulse waveform is adjustable, be applied to arbitrary above-mentioned fiber laser, and it comprises the following steps: S1, input square-wave signal; S2, carry out exporting data after data processing; S3, carry out exporting modulation signal after digital-to-analogue conversion.
Preferably, after described step S3, also carry out following steps S4: according to described modulation signal, drive seed source laser.
Preferably, between described step S3 and step S4, also carry out following steps S31: described modulation signal is carried out to electric current amplification.
Adopt such scheme, the present invention is quick and can compile random waveform, make the diversification of laser waveform, avoided lowering because the single square wave of seed source causes the performance of laser, improved output characteristic and the stability of laser, laser and output thereof are more stable, performance is more superior, can make laser diversification waveform under same pulsewidth, has promoted the performance of laser, make laser processing wider, there is good market using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of one embodiment of the present of invention;
Fig. 2 is the schematic diagram of an alternative embodiment of the invention;
Fig. 3 is the schematic diagram of another embodiment of the present invention;
Fig. 4 is the schematic diagram of another embodiment of the present 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 adopt many different forms to realize, and is 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.
As shown in Figure 1, one embodiment of the present of invention are, the fiber laser that a kind of impulse waveform is adjustable, and it comprises input interface, microprocessor and analog-digital chip; Described input interface input square-wave signal is to described microprocessor; Described microprocessor is processed rear output data to described analog-digital chip; Described analog-digital chip carries out exporting modulation signal after digital-to-analogue conversion.For example, described analog-digital chip carries out exporting modulation signal to driving chip, by described driving chip drives laser after digital-to-analogue conversion.Like this, just can make the diversification of laser waveform, improve output characteristic and the stability of laser, laser and output thereof are more stable.For example, as shown in Figure 1, input interface input square-wave signal is to MCU(microprocessor), supply module is microprocessor, analog-digital chip power supply, and for example, this supply module is also input interface power supply; In the time that input side's wave frequency is less than 1MHz, pass through analog-digital chip, the for example AD9748 of ADI company, can realize output and be greater than the random waveforms of 8 nanoseconds, comprises after square wave, low early and high after ripple, front height low ripple etc., avoid lowering because the single square wave of seed source causes the performance of laser,, performance is more superior, can make laser diversification waveform under same pulsewidth, promote the performance of laser, made laser processing wider.Preferably, described fiber laser also arranges a Waveform Editor, and it connects described microprocessor, for editing described square-wave signal, generates plan output waveform signals, processes rear output data to described analog-digital chip by described microprocessor; Preferably, described fiber laser also arranges a memory being connected with described Waveform Editor, described microprocessor respectively, it stores described square-wave signal, plan output waveform signals, last output waveform signals and at least one waveform masterplate, and described waveform masterplate comprises frequency, waveform and some deformation parameters; For example, wherein, deformation parameter is with reference to the setting of existing mapping software.Preferably, a presetting module is also set, it connects respectively described memory, described microprocessor, for default described waveform masterplate.Preferably, described presetting module is integrated is arranged in described microprocessor.
Preferably, the fiber laser that described impulse waveform is adjustable also comprises seed source laser, and it is connected with described analog-digital chip; Described analog-digital chip carries out exporting modulation signal to described seed source laser after digital-to-analogue conversion.For example, adopt the seed source as described fiber laser such as optical fiber acousto-optic Q modulation seed source, solid acousto-optic Q modulation seed source or pulsed drive single mode LD seed source.Preferably, seed source also amplifies by dual-stage amplifier, and for example, seed source order is amplified by first order amplifier and second level amplifier.Preferably, between seed source and first order amplifier, between the first order and second level amplifier, installing optical fibres isolator respectively, preferably, fibre optic isolater arranges Faraday rotator and two-stage isolator, preferably, isolator arranges wedge shape uniaxial crystal, for a branch of incident ray being decomposed into the orthogonal linearly polarized light of two row direction of vibration.Preferably, the pumping source of second level amplifier arranges tail optical fiber.Like this, can obtain good seed light source.
Preferably, as shown in Figure 2, described fiber laser also comprises metal-oxide-semiconductor (Metal Oxide Semiconductor transistor, metal oxide semiconductor transistor), and it is arranged between described analog-digital chip and described seed source laser; Input interface input square-wave signal is to MCU, and MCU processes rear output data to described analog-digital chip; Described analog-digital chip carries out exporting modulation signal to described metal oxide semiconductor transistor after digital-to-analogue conversion, carries out linear current amplification by it, outputs to described seed source laser.As shown in Figure 2, in the time that input side's wave frequency is 1kHz to 1MHz, output to metal-oxide-semiconductor by analog-digital chip, for example the LC821 of POLYFET chip companies, can realize the low early and high after waveform of 8 nanoseconds nanosecond to 500 of output, and there is the driving force of 2 peaces, drive seed source laser.And for example, above-mentioned Fig. 1, embodiment illustrated in fig. 2 in, MCU is the STM32F405RG of ST company.
Preferably, described fiber laser also comprises the waveform shaping circuit, constant-current drive circuit and the seed source laser that are linked in sequence.For example, in waveform shaping circuit, input signal one tunnel connects the inverting input of comparator through phase-shift circuit, and another road connects the in-phase input end of comparator; On the in-phase input end of comparator, connect feedback circuit, the two ends that the signal of processing by the signal of processing through lagging behind with without lagging behind loads on comparator simultaneously compare, and can detect the change in voltage of any base value and peak value, thus output signal after shaping.And for example, waveform shaping circuit comprises a Schmidt trigger or monostable flipflop, circuit state incoming level corresponding to when conversion the process that Schmidt trigger input signal rises from low level, different from input signal corresponding input switching levels from high level decline process; In the time that circuit state is changed, make the edge of output voltage waveforms become very steep by the positive feedback process of inside circuit, it is the square wave that edge is precipitous that edge is changed to waveform shaping signal slowly, and the noise being superimposed upon on the high and low level of rectangular pulse can be eliminated effectively; Or Fan Qi road and going.Preferably, waveform shaping circuit also comprises a regenerative circuit, and it utilizes retardation ratio method, carries out waveform processing, also, for maintaining the voltage difference at comparator two ends, makes the waveform stabilization of output.Constant-current drive circuit, by output constant current power supply, arranges and controls the optical output power of seed source laser; For example, constant-current drive circuit uses OPA695 high speed amplifier do the amplification of prime and set up current negative feedback circuit, can well stabling current, the pulse stability of seed source laser directly has influence on the reliability of laser, and employing constant-current drive circuit, can guarantee the pulse stability of seed source laser, thus effective guarantee the reliability of laser.
Preferably, described fiber laser also comprises DC protection circuit; Described waveform shaping circuit also connects the input of described DC protection circuit, and the output of described DC protection circuit connects the input of described constant-current drive circuit.DC protection circuit; it is direct-current supervision circuit; by the output of monitoring waveform shaping circuit; when judgement output pulse is excessive; for avoiding damaging seed source laser, and end output, go back output alarm signal; seed source laser has its specified input pulsewidth, excessive and damage seed source laser and use this DC protection circuit in order to prevent from exporting pulse.By being incorporated in the reset signal of CD4060 after the PD signals reverse of seed source laser, utilize the tally function of CD4060.In the time that the width of seed source pulse signal is greater than the pulse-width threshold presetting, output alarm signal of described DC protection circuit.Utilize 555 chips by alarm signal latch, then alarm signal is incorporated in drive circuit, drive circuit is turn-offed.Wherein, 555 chips are timers, are the integrated devices that a kind of analog-and digital-function combines.Preferably, also comprise alarm, it receives described alarm signal, output flashing light alarm or audible alarm; Preferably, alarm also comprises long-range link block, for described alarm signal being outputed to long-range keeper place by described long-range link block, for example, by described long-range link block, described alarm signal is outputed to the centralized monitor screen of company's integral production operation.
Preferably, described fiber laser also comprises current foldback circuit; The output of described constant-current drive circuit also connects the input of described current foldback circuit; The output of described current foldback circuit connects the input of described constant-current drive circuit.Current foldback circuit and above-mentioned DC protection circuit structure and effect are basic identical, by the output of monitoring constant-current drive circuit, when judgement output pulse is excessive, for avoiding damaging seed source laser, and end output, go back output alarm signal.
Preferably, described fiber laser also comprises missing pulse protective circuit; The output of described constant-current drive circuit also connects the input of described missing pulse protective circuit; The output of described missing pulse protective circuit connects the input of described constant-current drive circuit.In this example, adopt missing pulse protective circuit protection optical fiber, for example, for the laser of MOPA structure, if lacked suddenly severally in the seed source pulse of opening the light in way, in the Active Optical Fiber of laser, will, owing to assembling very high energy, optical fiber be blown so.Missing pulse protective circuit can effectively notify the main control chip of laser to stop immediately opening the light in missing pulse.By in the reset signal of the good CD4060 of PD signal leading of seed source laser, utilize the tally function of CD4060; Wherein, PD signal is the signal of telecommunication after the opto-electronic conversion of seed source laser inside.When there is no seed source pulse signal in a period of time, there is missing pulse, circuit is reported to the police, preferred, adopts 555 chips by alarm signal latch output, for example, alarm signal is drawn out in extraneous master control, notifies extraneous master control out of service; Or missing pulse protective circuit is ended the input of described constant-current drive circuit.
Preferably, as shown in Figure 3, described input interface input square-wave signal is to described microprocessor; For example it comprises four signals, and for example, D0 is that pulsewidth selection lowest order, D3 are that pulsewidth is selected highest order, and the rest may be inferred; Described microprocessor arranges high speed MCU circuit, after processing square-wave signal, the data of output digit signals are to described analog-digital chip, analog-digital chip arranges high-speed DAC (Digital to analog converter, digital analog converter) circuit, carry out digital-to-analogue conversion, the pulse signal that the digital signal obtaining from MCU is converted to simulation is as described modulation signal; Then by waveform shaping circuit, waveform is carried out to Shape correction, waveform shaping circuit is connected with constant-current drive circuit, DC protection circuit respectively, and the adjustment waveform that waveform is carried out to stable output after Shape correction is to constant-current drive circuit and DC protection circuit; The output of DC protection circuit monitoring waveform shaping circuit, when judgement output pulse is excessive, ends output output alarm signal.Constant-current drive circuit stabling current outputs to missing pulse protective circuit, and outputs to the pulse signal of laser output as seed source laser or laser head, and preferred, constant-current drive circuit comprises negative-feedback circuit.Missing pulse protective circuit feedback outputs to described constant-current drive circuit; at described fiber laser duration of work; or do not receive seed source pulse signal in work a period of time, missing pulse appears in judgement, report to the police and/or end described constant-current drive circuit output.And for example, as shown in Figure 4, constant-current drive circuit also connects current foldback circuit; described current foldback circuit feedback outputs to described constant-current drive circuit, and it monitors the output of described constant-current drive circuit, when judgement output pulse is excessive; end described constant-current drive circuit output, go back output alarm signal.Preferably; alarm is also set; it connects respectively described DC protection circuit, described missing pulse protective circuit, described current foldback circuit, for receiving described alarm signal, sends warning flash of light, alarm sound or remote alarms note, remote alarms message etc.For example, in DAC circuit, adopt (300M) parallel analog-digital chip at a high speed, the digital signal obtaining is converted to the pulse signal of simulation from MCU.It is the signal that can produce random waveform by the object of MCU and DAC.Preferably, adopt MCU(168Mhz at a high speed) provide fast parallel data and the clock signal of 168mhz to DAC.The various embodiments described above, change the present situation that can only drive with square wave seed source laser, for example exporting low early and high after waveform, can laser driver module can be that the performance parameter of laser is more superior, the performance that low early and high after waveform modulated can improving laser device; And can obtain circuit module low early and high after and that electric current is enough.The laser driver module with low early and high after waveform can suppress the peak power of laser well, and then allows the performance of laser get a promotion, and promotes single pulse energy.
Be combined application with above-mentioned arbitrary embodiment, another embodiment of the present invention is as follows: the modulator approach of the fiber laser that a kind of impulse waveform is adjustable, be applied to arbitrary above-mentioned fiber laser, and it comprises the following steps: S1, input square-wave signal; S2, carry out exporting data after data processing; S3, carry out exporting modulation signal after digital-to-analogue conversion.Preferably, in step S1, input square-wave signal by input interface; In step S2, receive described square-wave signal by microprocessor, after processing, output data are to analog-digital chip; In step S3, described analog-digital chip carries out exporting modulation signal after digital-to-analogue conversion.Preferably, in step S3, described analog-digital chip carries out exporting modulation signal to driving chip to carry out drive laser after digital-to-analogue conversion.Preferably, in step S3, described analog-digital chip carries out exporting modulation signal to seed source laser after digital-to-analogue conversion.Preferably, in step S3, described analog-digital chip carries out exporting modulation signal to metal oxide semiconductor transistor after digital-to-analogue conversion, carries out linear current amplification by it, outputs to seed source laser.Preferably, in step S3, described analog-digital chip carries out exporting modulation signal to waveform shaping circuit after digital-to-analogue conversion, outputs to constant-current drive circuit after shaping, and output constant current power supply is to seed source laser.Preferably, in step S3, waveform shaping circuit also outputs to DC protection circuit, by the modulation signal after its monitoring shaping, arrives seed source laser by output constant current power supply.Preferably, constant-current drive circuit also feeds back monitoring by a current foldback circuit and/or missing pulse protective circuit, judges whether overcurrent or missing pulse, and arbitrary judged result is yes, ends export and report to the police.
Preferably, the modulator approach of the fiber laser that a kind of impulse waveform is adjustable, it comprises the following steps: S1, input square-wave signal; S2, carry out exporting data after data processing; S3, carry out exporting modulation signal after digital-to-analogue conversion; S4, according to described modulation signal, drive seed source laser.
Preferably, the modulator approach of the fiber laser that a kind of impulse waveform is adjustable, it comprises the following steps: S1, input square-wave signal; S2, carry out exporting data after data processing; S3, carry out exporting modulation signal after digital-to-analogue conversion; S31, described modulation signal is carried out to electric current amplification; S4, according to described modulation signal, drive seed source laser.
Further, embodiments of the invention also comprise, each technical characterictic of the various embodiments described above, adjustable fiber laser and the modulator approach thereof of impulse waveform being mutually combined to form.Adopt the various embodiments described above, realized waveform diversification, make laser processing wider, for example, realized aluminium oxide by 8ns waveform and cracked down evil force; And for example, adopt low early and high after waveform to realize stainless steel and beat whitely, and the laser of square-wave frequency modulation is beaten white technological effect can to beat white technique than the laser of low early and high after waveform poor doing laser stainless steel; Adopt low early and high after waveform also to realize the processing of dark carving, and the laser of square wave can be much slower than the laser of the low early and high after waveform of various embodiments of the present invention in the speed of doing laser and deeply carve processing.
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. the adjustable fiber laser of impulse waveform, is characterized in that, comprises input interface, microprocessor and analog-digital chip;
Described input interface input square-wave signal is to described microprocessor;
Described microprocessor is processed rear output data to described analog-digital chip;
Described analog-digital chip carries out exporting modulation signal after digital-to-analogue conversion.
2. fiber laser according to claim 1, is characterized in that, also comprise seed source laser, it is connected with described analog-digital chip;
Described analog-digital chip carries out exporting modulation signal to described seed source laser after digital-to-analogue conversion.
3. fiber laser according to claim 2, is characterized in that, also comprise metal oxide semiconductor transistor, it is arranged between described analog-digital chip and described seed source laser;
Described analog-digital chip carries out exporting modulation signal to described metal oxide semiconductor transistor after digital-to-analogue conversion, carries out linear current amplification by it, outputs to described seed source laser.
4. fiber laser according to claim 1, is characterized in that, also comprises the waveform shaping circuit, constant-current drive circuit and the seed source laser that are linked in sequence.
5. fiber laser according to claim 4, is characterized in that, also comprises DC protection circuit;
Described waveform shaping circuit also connects the input of described DC protection circuit, and the output of described DC protection circuit connects the input of described constant-current drive circuit.
6. fiber laser according to claim 5, is characterized in that, also comprises current foldback circuit;
The output of described constant-current drive circuit also connects the input of described current foldback circuit;
The output of described current foldback circuit connects the input of described constant-current drive circuit.
7. fiber laser according to claim 6, is characterized in that, also comprises missing pulse protective circuit;
The output of described constant-current drive circuit also connects the input of described missing pulse protective circuit;
The output of described missing pulse protective circuit connects the input of described constant-current drive circuit.
8. a modulator approach for the adjustable fiber laser of impulse waveform, is applied to the arbitrary described fiber laser of claim 1 to 7, it is characterized in that, comprises the following steps:
S1, input square-wave signal;
S2, carry out exporting data after data processing;
S3, carry out exporting modulation signal after digital-to-analogue conversion.
9. modulator approach according to claim 8, is characterized in that, after described step S3, also carries out following steps S4: according to described modulation signal, drive seed source laser.
10. modulator approach according to claim 9, is characterized in that, between described step S3 and step S4, also carries out following steps S31: described modulation signal is carried out to electric current amplification.
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| CN107968311B (en) * | 2017-12-21 | 2019-10-29 | 山东大学 | A kind of MOPA pulse optical fiber and its working method |
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| CN108512602B (en) * | 2018-04-17 | 2021-05-14 | 渤海大学 | Wireless laser communication equipment |
| CN109088304A (en) * | 2018-09-18 | 2018-12-25 | 深圳市杰普特光电股份有限公司 | Fiber pulse laser |
| WO2020094115A1 (en) * | 2018-11-08 | 2020-05-14 | 深圳市杰普特光电股份有限公司 | Laser, laser generation method, and computer-readable storage medium |
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| CN113204256B (en) * | 2021-04-30 | 2022-07-01 | 国家石油天然气管网集团有限公司华南分公司 | Photoelectric conversion circuit of intelligent interface inspection tester and temperature control method |
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