CN106785837A - One kind eliminates the Q impulse optical fiber laser output rough control method of pulse - Google Patents
One kind eliminates the Q impulse optical fiber laser output rough control method of pulse Download PDFInfo
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- CN106785837A CN106785837A CN201611156217.7A CN201611156217A CN106785837A CN 106785837 A CN106785837 A CN 106785837A CN 201611156217 A CN201611156217 A CN 201611156217A CN 106785837 A CN106785837 A CN 106785837A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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Abstract
One kind eliminates the Q impulse optical fiber laser output rough control method of pulse, belongs to pulse optical fiber technical field.The purpose of the present invention is directed to the existing output rough problem of pulse, proposes that a kind of Q impulse optical fiber laser that eliminates exports the rough control method of pulse.Control method includes the selection operation of gain fibre 4 (doubly clad optical fiber) optimization length；Pumping source exports the control operation of best power；The regulation operation of Q-switch parameter.The present invention utilizes existing universal experimental provision, by induction and conclusion, draw the method and steps such as optimization, the selection of optimal pump power, the regulation of repetition rate and the control of opening time, rise time and fall time of signal generator of a set of clear efficient operating procedure, i.e. gain fibre.Using above-mentioned steps method, can effectively remove the unsmooth part of pulse, the Q impulse optical fiber laser output rough purpose of pulse is eliminated so as to reach, optimize the shape of output pulse waveform.
Description
Technical field
The invention belongs to pulse optical fiber technical field, and in particular to it is defeated that one kind eliminates Q impulse optical fiber laser
Go out the rough control method of pulse.
Background technology
Pulse optical fiber can produce the high burst pulse of power, and with quality is good, low cost, small volume,
The advantages of perfect heat-dissipating, therefore had a wide range of applications in the real life fields such as Laser Processing, communication, medical science, military affairs.
At present, pulse optical fiber output high-power, the burst pulse mode of high-quality mainly have Q-regulating technique, mode-locking technique and master
Hunting power amplifies (MOPA) technology.Wherein actively Q-switched pulse optical fiber is with a series of of pulse optical fiber
While advantage, also with the performance of output pulse repetition, pulsewidth stabilization and easy regulation, therefore in pulse optical fiber
Occupy very important position.
But, Q impulse optical fiber laser can produce rough pulse, reduce the quality of output pulse, it is difficult to
To preferable smooth Gaussian impulse waveform, so that influence to laser machine effect, with more potential safety hazard；If by Q impulse light
The pulse that fibre laser is produced is amplified as seed source, and rough pulse can still influence amplification system, causes to amplify
The damage of device.Therefore, how to control and eliminate the unsmooth of actively Q-switched pulse optical fiber output pulse, also will be as arteries and veins
Wash one of emphasis of fibre laser research off.
The content of the invention
The unsmooth problem of pulse is exported for existing Q impulse optical fiber laser, the present invention proposes a kind of elimination Q impulse
Optical fiber laser exports the rough control method of pulse.Its object is to pass through control influence output pulse smoothness because
Element, so as to eliminate the unsmooth problem of output pulse, improves the quality that pulse optical fiber exports pulse.
To achieve these goals, the control method that the present invention is provided can include：Gain fibre 4 (doubly clad optical fiber) is most
The selection operation of excellent length；Pumping source exports the control operation of best power；The regulation operation of Q-switch parameter.
The selection operation of doubly clad optical fiber optimization length can include：It is double when pump power and Q-switch parameter are fixed
The selection operation of cladded-fiber optimization length；When pump power and Q-switch changeable parameters, doubly clad optical fiber optimization length
Selection operation.
The control operation of pumping source output best power can include：When Q-switch parameter and fiber lengths are fixed, pump
The control operation of Pu power；When Q-switch parameter and variable fiber lengths, the control operation of pump power.
The regulation operation of the parameter of Q-switch can include：When the repetition rate of Q-switch is fixed, the opening time of Q-switch,
The regulation operation of rise time and fall time；Fixed when the opening time of Q-switch, the repetition rate of Q-switch, rise time
And the regulation operation of fall time；Fixed when the rise time of Q-switch, the repetition rate opening time of Q-switch and decline
The regulation operation of time；Fixed when the fall time of Q-switch, the tune of the repetition rate, opening time and fall time of Q-switch
Section operation.
According to introduction of the invention, above-mentioned Q-switch can include：Q-switch modulator and can change Q-switch modulation
Think highly of the signal generator (PSG) of complex frequency, opening time, rise time and fall time.Q-switch modulator is common to be included
Acousto-optic Q modulator or electric light Q modulator, signal generator can be with configuration change signal waveform and the command functions of amplitude.
As shown in Fig. 1 structures, Q impulse optical fiber laser is by multimode pumping source 8, pumping source protector 7, optical-fiber bundling device
6th, low reflective grid 5, gain fibre 4, acousto-optic modulator (AOM) 2, pulse signal generator (PSG) 3, reflective grid 1 high are constituted；Survey
Trial assembly is put by 1:99 beam splitter 9, photodetector 10, oscillograph 11, power meter 12 are constituted.Multimode pumping source 8 has output
Port, pumping source protector 7 has input port, output port；Fiber coupler 6 has pump ports, input port, output
Port；The centre wavelength that multimode pumping source 8 is included by wave-length coverage of pumping source protector 7, prevents wavelength comprising low reflective
The centre wavelength of grid 5, reflective grid 1 high；The emission spectra of gain fibre 4 includes low reflective grid 5, the centre wavelength of reflective grid 1 high；It is low
Reflective grid 5, reflective grid 1 high are a pair of reflective grid of height；Acousto-optic modulator (AOM) 2 has two ends tail optical fiber and electrical input mouthful；Arteries and veins
Signal generator (PSG) 3 is rushed with electricity output port；Power meter 12 has optical signal input mouthful；Oscillograph 11 has telecommunications
Number input port；Photodetector 10 has optical signal input mouthful and electric signal output port；1:99 beam splitter 9 has work(
Rate input, 1% power output and 99% power output port.The output that the input port of the beam splitter 9 passes through optical-fiber bundling device 6
Port is connected with optical-fiber bundling device 6；1% power output port of beam splitter 9 and the optical signal import and export end of photodetector 10
Mouth is connected；The electric signal output port of photodetector 10 is connected with the electric signal output port of oscillograph 11；Beam splitter 9
99% power output port is connected with the optical signal input of power meter 12 mouthful；The output port of laser multimode pumping source 8 and pumping
The input port of source protection device 7 is connected；The output port of pumping source protector 7 is closed by the pump ports of optical-fiber bundling device 6 with optical fiber
Beam device 6 is connected；The output port of optical-fiber bundling device 6 successively with low reflective grid 5, gain fibre 4, acousto-optic modulator 2, reflective grid high
1 is connected；The electricity output port of pulse signal impulse generator (PSG) 3 is connected with the electrical input mouthful of acousto-optic modulator (AOM) 2.
Device coupling part in experiment, except signal pulse generator (PSG) and acousto-optic modulator (AOM) 2 and photodetector 10
It is connected outer with the coupling part electric transmission line of oscillograph 11, remaining device coupling part uses fused fiber splice mode.
The course of work：
The pump light of the output of multimode pumping source 8 sequentially passes through pumping source protector 7, optical-fiber bundling device 6, low reflective grid 5 and passes
Gain fibre 4 is transported to, the population inversion of gain fibre 4 is realized.The other end of gain fibre 4 is sequentially connected acousto-optic modulator
(AOM) 2 and reflective grid 1 high, reflective grid 1 high and low reflective grid 5 form two resonant-cavity surfaces of laser, carry out exporting laser
Select ripple to act on, acousto-optic modulator (AOM) 2 be have regulation Q state function Q-switch device, reflective grid 1 high, low reflective grid 5,
Gain fibre 4, acousto-optic modulator (AOM) 2 with population inversion collectively forms Q adjusting optical fiber laser resonator, is formed and adjusts Q
The output of pulse.When repetition rate, dutycycle, the rising of the pulse signal that pulse signal generator (PSG) 3 is produced by change
Between, fall time, correspondingly change the repetition rate of acousto-optic modulator (AOM) 2 this Q-switch being attached thereto, the opening time,
Rising edge, trailing edge, so as to change the Q impulse characteristic of output, to reach and export pulse not in elimination Q impulse optical fiber laser
Smooth purpose.
Specific influence of the pulse signal generator (PSG) 3 on acousto-optic modulator (AOM) 2 be：
Pulse signal generator (PSG) 3 controls the acousto-optic modulator (AOM) 2 being attached thereto to enter by its signal for producing
Row Q state adjust, the output signal of pulse signal generator (PSG) 3 be in high level, corresponding to acousto-optic modulator (AOM) 2 this
Q-switch is in opening；The output signal of pulse signal generator (PSG) 3 is in low level, corresponding to acousto-optic modulator
(AOM) 2 this Q-switch are closed；The output signal of pulse signal generator (PSG) 3 is in by low level to high level
Propradation, be in propradation corresponding to acousto-optic modulator (AOM) 2 this Q-switch；(PSG) 3 is defeated for pulse signal generator
Go out signal to be in by high level to low level decline state, corresponding to acousto-optic modulator (AOM) 2, this Q-switch is in decline
State.The signal of the generation of pulse signal generator (PSG) 3 mentioned above and the Q shapes of this Q-switch of acousto-optic modulator (AOM) 2
The relation of state understands that pulse signal generator (PSG) 2 passes through to adjust repetition rate, dutycycle, the rising of the pulse signal for producing
Time, fall time, the repetition rate, (opening time=pulse signal opening time of acousto-optic modulator (AOM) 2 this Q-switch
Cycle × dutycycle=1/ repetition rate × dutycycle), rise time, fall time changed also responsive to ground, so as to change
The Q impulse characteristic of output, eliminates the output unsmooth problem of pulse in Q adjusting optical fiber laser.
According to the control method that the present invention is provided, by controlling the factor of influence output pulse smoothness, pulse is eliminated
It is unsmooth, comprise the following steps：
Step S101, the length of the gain fibre 4 that the pulse optical fiber is used obtains pulse according to required for
Width (in following examples, required pulse width is 10ns~100ns, and required repetition rate is 10Khz~100Khz) is counted
Calculate (computing formula is shown in embodiment), then set optimal fiber lengths；
Step S102, by Regulate signal generator 3, the repetition rate of fixed Q-switch acousto-optic modulator (AOM) 2 is institute
It is pulse to need scope maximum (repetition rate needed for embodiment is 10Khz~100Khz, therefore is fixed as 100Khz), opening time
Signal period (signal period=1/ repetition rate) 10%, rise time and fall time be the 10% of the opening time, by institute
The power of multimode pumping source 8 for stating pulse optical fiber is started from scratch increase, observation oscilloscope, when there is impulse waveform to generate with
Afterwards, power meter 12 and oscillograph 11 need to simultaneously be observed, it can be seen that power output can increase with the increase of pump power, output
The secondary peak number of impulse waveform both sides can also be reduced, the non-smooth degree reduction of output pulse waveform, continue increase pump power straight
To power output highest, now the secondary peak number of output pulse waveform both sides is minimum or both sides are uneven smoothened, output
The non-smooth degree reduction of impulse waveform, corresponding pump power is optimal pump power；
Step S103, sets above-mentioned pump power as optimal pump power, by the pulse optical fiber Q-switch acousto-optic
(repetition frequency range is 10Khz~100Khz to the repetition rate of modulator (AOM) 2 in embodiment, above-mentioned solid within the required range
Determine 100Khz) start regulation from big to small, output pulse waveform, the unnecessary secondary summit in impulse waveform both sides are observed by oscillograph
Slowly reduce again or the uneven place in both sides is reduced, when output pulse both sides secondary peak number is minimum or the uneven place in both sides becomes
When must smooth, be also output pulse waveform non-smooth degree it is minimum when, fixed repetition rate now is constant；
Step S104, on the basis of above parameter setting, by the pulse optical fiber Q-switch acousto-optic modulator
(AOM) 2 opening time slowly reduce the 10% of pulse signal cycle (opening time for), while observing defeated by oscillograph 10
Go out pulse frequency and waveform, it can be seen that the unnecessary secondary peak in output pulse waveform both sides or uneven place, can with opening when
Between reduction continue reduce or it is smoothened, but the opening time can not reduce always, can cause export pulse frequency not
Equal to Q-switch repetition rate, therefore on the premise of the frequency for meeting output pulse is equal to Q-switch repetition rate, export pulse
When waveform non-smooth degree is minimum, the fixed opening time now is constant；
Step S105, has been able to export the non-smooth degree reduction of pulse according to the above-mentioned step of the present invention.If this
When output pulse also there is rough situation and adjusted, it is necessary to continue through the regulation Q-switch acousto-optic of pulse signal generator (PSG) 3
The rise time or fall time of device (AOM) 2 processed, further eliminate the unsmooth of pulse.
In the present invention, above-mentioned method can carry out different combination regulations according to actual conditions, so as to reach effectively
The purpose of the control influence rough factor of pulse, and then eliminate the output unsmooth problem of pulse.
Above-mentioned actual conditions can include：When gain fibre length can not become, it is convenient to omit step S101；When repetition
When frequency has been fixed, it is convenient to omit step S103；When output pulse waveform both sides are without secondary peak, only a little uneven place,
The actual conditions such as step S104, S105 can be simply used.
The function of the method for the invention：
The purpose of the present invention is directed to the existing output rough problem of pulse, proposes that a kind of Q impulse optical fiber that eliminates swashs
Light device exports the rough control method of pulse.Using existing universal experimental provision, by induction and conclusion, it is a set of clear to draw
Optimization, the selection of optimal pump power, the regulation of repetition rate and the signal generation of efficient operating procedure, i.e. gain fibre
The method and steps such as the control of opening time, rise time and fall time of device.Using above-mentioned steps method, can effectively go
Fall the unsmooth part of pulse, eliminate the Q impulse optical fiber laser output rough purpose of pulse so as to reach, optimization output arteries and veins
Rush the shape of waveform.
It should be noted that：Method proposed by the present invention, it should according to needed for itself, is mutually combined, and can be only achieved
Optimize the purpose of output pulse waveform.And just for actively Q-switched pulse optical fiber (acousto-optic Q modulation pulse optical fiber,
Electric-optically Q-switched pulse optical fiber etc.), possess the pulse optical fiber of actively Q-switched device, for passive Q regulation pulse optical fiber
Laser, because many parameters cannot be adjusted, institute's method described above is not appropriate for.
Brief description of the drawings
From the exemplary embodiment below in conjunction with accompanying drawing it is descriptive in, it is of the invention above-mentioned or other aspect will more show and
It is clear to and clear understandable.
Fig. 1：Experimental provision structural representation of the present invention；
Fig. 2：Opening time of signal generator of the present invention control acousto-optic modulator (AOM), the rise time and under
The schematic diagram of drop time；
Fig. 3：The oscillogram of the forward and backward output pulse of experimental provision control of the present invention.
Specific embodiment
In order to be more clearly understood from the above method of the invention, step, below in conjunction with the accompanying drawings and specific embodiment party
Method is further described in detail to the present invention.
Embodiment 1：
In the present embodiment, power meter 12, using the model omnipotent laser power of HW-VLP-2000-10W types, maximum range
It is 10W；Oscillograph 11, the DS06032A digital oscilloscopes produced using Beijing Pu Yuan Jing electricity companies, with a width of 300MHz；Photoelectricity
Detector 10, using the optical-fiber-coupling type indium gallium arsenic detector of thorlabs companies, wavelength response range is 800-1700nm, band
A width of 1.2GHz, can bear peak power for 50mW.Beam splitter 9, operation wavelength is the 1 of 1060nm：Use at 99 beam splitters, 1% end
In the test of pulse spectrum and waveform, 99% end is tested for pulse power, and maximum bears power for 10W；Multimode pumping source 8,
It is the multimode semiconductor laser with tail optical fiber produced by Shanghai Ke Naite companies, centre wavelength is 980nm, highest pumping
Power is 10W；Pumping source protector 7, use wavelength be 975nm multimode pumping protecting filter as pumping source guarantor
Protection unit, it passes through wavelength for 900-1000nm, and prevention wavelength is 1020-1120nm；Optical-fiber bundling device 6, uses (2+1) × 1
High-power fiber bundling device, the bundling device single armed maximum bears power for 10W；Reflective grid 1 high, low reflective grid 5 are high as a pair
Low reflective grid, the centre wavelength of reflective grid 1 high is 1063.86nm, and reflectivity is 99.6%, and the centre wavelength of low reflective grid 5 is
1063.75nm, reflectivity is 9.8%, and the fiber size of two gratings is 10/125um, and numerical aperture NA is 0.08/0.46；
Gain fibre 4 is yb-doped double-clad fiber, and fibre core, inner cladding dimensions are 10/130um, and numerical aperture NA is 0.075/0.46,
Absorption loss near 975nm is 3.9dB/m；Acousto-optic modulator (AOM) 2, using by the middle electric 26 SGYF100-1 types developed
Number optical-fiber type acousto-optic modulator (AOM), operation wavelength is 1064nm, and working frequency is 100Mhz, and maximum can bear average light
Power is 5W, and the rise time is 26ns, insertion loss 1.9dB, extinction ratio 60dB, and input, output optical fibre type are GSF-10/
125, first-order diffraction light direction is output end；Pulse signal generator 3, the model produced using Beijing Pu Yuan companies
The AWG of DG1000Z series, can produce impulse waveform, square wave, triangular signal, using generation in the present invention
Pulse signal, its repetition rate, pulse duty factor, rise time, fall time are adjustable, pulse duty factor 0.1%-99.9%
It is adjustable.
In the present embodiment, as shown in the schematic diagram of Q-switch in Fig. 2, t1 represents the rise time, and t2 represents fall time, t3
Represent total opening time of Q-switch.The present embodiment by the repetition rate of the output pulse signal of Regulate signal generator (PSG) 3,
Rise time, fall time, dutycycle, and then control repetition rate, rise time, fall time and total unlatching of Q-switch
Time.
With reference to Fig. 1, Fig. 2, the rough control method of elimination pulse of present invention offer is illustrated.Adjusting Q light
In fibre laser, the minimum pulse width Δ t that output Q-switched pulse is obtained in thatminWith the relational expression between the length L of gain fibre 4 such as public affairs
Shown in formula (1)：
Δtmin=2nL/c (1)
Wherein, n is the refractive index of gain fibre 4, and c is the light velocity.Understand, Q impulse optical fiber laser is obtained in that
Most ditty Q pulsewidths Δ tminIt is light in the time used of intracavity round trip one week.Pulse width needed for therefore, it can root, obtains gain light
Fine 4 length.In the present embodiment, required pulse width is 10ns~100ns, can take output Q-switched pulse minimum pulse width
=50ns, using minimum pulse width Δ tminWith the relation between gain fibre length L, the length for deriving gain fibre 4 is 5m.
And then, first opening signal generator (PSG) 3, fixes peak frequency of the repetition rate of Q-switch for needed for
100Khz (in this example, required repetition rate is 10Khz~100Khz), the opening time is the 10% of pulse signal cycle,
As 1us, rise time and fall time are the 10% of the opening time, that is, be 100ns.
Multimode pumping source 8 is then turned on, slowly increases pump power, and power output is measured by power meter 12, directly
Constant to power output or when starting to reduce, fixed pump power now is constant.This is due to the increasing of pump power
Plus, amplified spontaneous emission light ASE and nonlinear effect in resonator can also increase therewith, it is therefore desirable to find pump power
Optimum value so that in the resonating at frequencies chamber, gain is maximum, and power output is maximum, and the Q impulse for now exporting is not
Smoothness is also lower.In the present embodiment when pump power is 8W, peak power output is 2.14W, so by embodiment
Optimal pump power fixed be set to 8W.
The frequency of Regulate signal generator (PSG) 3, makes Q-switch repetition rate from big to small therewith, and observes output arteries and veins
Frequency is rushed, until output pulse non-smooth degree is minimum, fixed repetition rate now is constant.This is due in optimal pump power
Under conditions of, when the opening time of Q-switch, rise time, fall time are fixed, repetition rate is different, the shut-in time of Q-switch
Difference, the energy of accumulation is also different, the Energy distribution of influence output pulse, so the method by reducing repetition rate, regulation
Energy distribution on the output pulse, changes the non-smooth degree of pulse.In the present embodiment, it is when reaching minimum repetition rates
During 10Khz, the non-smooth degree of pulse now than relatively low, so the repetition rate of signal generator in embodiment is set as
10Khz。
Opening time of Regulate signal generator (PSG) 3 again, the size of opening time decide inverted population
Number.Embodiment is by the constantly regulate opening time, before output pulse recurrence frequency is met with Q-switch repetition rate identical
Put, observe output pulse waveform, when exporting pulse and being most smooth, the fixed opening time now is constant.With change Q-switch weight
The reason for complex frequency causes output pulse non-smooth degree to change is identical, in optimal pump power and the premise of fixed repetition rate
Under, changing the Q-switch opening time, the Q-switch shut-in time changes, and the energy of accumulation is different, so as to export pulse non-smooth degree change
Become.In the present embodiment, when activated between for 500ns when, the waveform of pulse is best, most smooth, so by signal in embodiment
The opening time of generator is set as 500ns.
According to the above-mentioned method and step regulation of the present embodiment and set, be that can reduce or eliminate that pulse is rough to ask
Topic；If just less rough problem is also deposited in pulse, when can continue Regulate signal generator rising according to the methods below
Between and fall time.
When adjusting rise time and fall time, the waveform situation of output pulse is observed, with the unsmooth position of waveform
Change, by the rise time and fall time regulation combine.When the rise time is increased, the non-smooth degree of pulse foreword will
Can reduce, cause the non-smooth degree of pulse back edge to raise, this is due to when the rise time of increase Q-switch, the population of release
Maximum rate by backward delay so that photon number density reaches the moment backward delay of peak, and output pulse waveform reaches
The moment at top also backward delay so that the waveform reduction in forward position, the waveform increase on edge afterwards, but when increasing fall time,
Increase the non-smooth degree in forward position with comprehending, the reduction on edge afterwards.Therefore when using regulation rise time or fall time, root
It is what is determined along non-smooth degree by elimination forward position non-smooth degree, or after elimination according to required reality.
Above is as a example by eliminating the output pulse of acousto-optic Q modulation pulse optical fiber and be unsmooth, to base of the present invention
It is described in detail in the Q impulse optical fiber laser output rough control method of pulse, the explanation of above example
Help is conducive to understand the method for the present invention；Simultaneously for those of ordinary skill in the art, this description should not be construed as
Limitation of the present invention, in the case of without departing substantially from control method of the present invention, the various obvious change carried out to it
All within protection scope of the present invention.
Claims (5)
1. it is a kind of to eliminate the Q impulse optical fiber laser output rough control method of pulse, described Q impulse optical-fiber laser
Device is by multimode pumping source (8), pumping source protector (7), optical-fiber bundling device (6), low reflective grid (5), gain fibre (4), acousto-optic
Modulator (2), pulse signal generator (3), reflective grid (1) composition high；Test device is by 1:99 beam splitters (9), photodetection
Device (10), oscillograph (11), power meter (12) composition；Its step is as follows：
Step S101, the width that the length of gain fibre (4) obtains output pulse according to required for is calculated, and is then set most
Excellent fiber lengths；
Step S102, by Regulate signal generator (3), the repetition rate of fixed Q-switch acousto-optic modulator (2) scope for needed for
Maximum, 10% that the opening time is pulse signal cycle, rise time and fall time are the 10% of the opening time, by the arteries and veins
Multimode pumping source (8) power for washing fibre laser off is started from scratch increase, observation oscilloscope, after thering is impulse waveform to generate,
Power meter (12) and oscillograph (11) need to be simultaneously observed, power output can increase with the increase of pump power, export pulse
The secondary peak number of waveform both sides can also be reduced, the non-smooth degree reduction of output pulse waveform, continue to increase pump power until defeated
Go out power highest, now the secondary peak number of output pulse waveform both sides is minimum or both sides are uneven smoothened, export pulse
The non-smooth degree reduction of waveform, corresponding pump power is optimal pump power；
Step S103, sets above-mentioned pump power as optimal pump power, by the pulse optical fiber Q-switch acousto-optic modulation
The repetition rate of device (2) starts regulation from big to small within the required range, and output pulse waveform, impulse wave are observed by oscillograph
The unnecessary secondary summit in shape both sides slowly reduces again or the uneven place in both sides is reduced, and when output pulse both sides, secondary peak number is minimum
Or the uneven place in both sides it is smoothened when, be also output pulse waveform non-smooth degree it is minimum when, fixed repetition now is frequently
Rate is constant；
Step S104, on the basis of above parameter setting, by the pulse optical fiber Q-switch acousto-optic modulator (2)
Opening time slowly reduces, while observing output pulse frequency and waveform, output pulse waveform both sides unnecessary secondary peak or recessed
At convex injustice, can continue to reduce or smoothened with the reduction of opening time, be opened equal to Q in the frequency for meeting output pulse
On the premise of closing repetition rate, when output pulse waveform non-smooth degree is minimum, the fixed opening time now is constant；
Step S105, if output pulse also has rough situation, continues through pulse signal generator (3) regulation Q and opens
Close the rise time or fall time of acousto-optic modulator (2), further eliminate the unsmooth of output pulse.
2. a kind of Q impulse optical fiber laser that eliminates as claimed in claim 1 exports the rough control method of pulse, and it is special
Levy and be：In step S101, the minimum pulse width Δ t that output Q-switched pulse is obtained in thatminWith the pass between the length L of gain fibre 4
It is shown in formula such as formula (1)：
Δtmin=2nL/c (1)
Wherein, n is the refractive index of gain fibre 4, and c is the light velocity.
3. a kind of Q impulse optical fiber laser that eliminates as claimed in claim 1 exports the rough control method of pulse, and it is special
Levy and be：When gain fibre length can not become, step S101 is omitted.
4. a kind of Q impulse optical fiber laser that eliminates as claimed in claim 1 exports the rough control method of pulse, and it is special
Levy and be：When repetition rate has been fixed, step S103 is omitted.
5. a kind of Q impulse optical fiber laser that eliminates as claimed in claim 1 exports the rough control method of pulse, and it is special
Levy and be：When output pulse waveform both sides are without secondary peak, only a little uneven place omits step S101~S103.
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| CN113794089A (en) * | 2021-08-09 | 2021-12-14 | 深圳泰德激光科技有限公司 | Laser debugging method, laser debugging system, and computer-readable storage medium |
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