CN103219640B - Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser - Google Patents
Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser Download PDFInfo
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Abstract
The invention discloses a method and a device for restraining ASE (Amplified Spontaneous Emission) in a high-power narrow-pulse optical fiber laser. The method comprises the following steps of modulating the repeated frequency of a seed laser emitted by a single mode laser diode seed source and modulating the output waveform of the seed laser as a second-order ultra Gaussian form by virtue of a pulse-driven power supply according to the output characteristic requirements of the output laser of the high-power narrow-pulse optical fiber laser; normally starting the high-power narrow-pulse optical fiber laser, enabling the average power of the output laser of the high-power narrow-pulse optical fiber laser to meet the output characteristic requirements, and detecting the pulse width of the output laser of the high-power narrow-pulse optical fiber laser by the use of a photoelectric detector and an oscilloscope; and under the condition that the detected pulse width does not meet the output characteristic requirements, modulating the pulse width of the seed laser emitted by the single mode laser diode seed source by virtue of the pulse-driven power supply so as to enable the pulse width of the output laser to meet the output characteristic requirements.
Description
Technical field
The present invention relates to field of mobile communication, particularly relate to suppressing method and the device of ASE in a kind of high power narrow pulse fiber laser.
Background technology
Fig. 1 is high power narrow pulse fiber laser structure schematic diagram in prior art, and as shown in Figure 1, the laser diode of burst pulse electrical modulation that adopts as seed source more at present, and the structure of connecting fiber amplifier forms high power narrow pulse fiber laser thereafter.
As shown in Figure 1, laser diode seed source adopts pulse driving power to drive, by adjusting the output parameter (comprising: repetition rate, pulse duration, impulse waveform and watt level etc.) of its drive current directly modulation seed laser.Fig. 2 is the schematic diagram of the different output waveforms of seed laser in prior art, and as shown in Figure 2, the output waveform of seed laser can be modulated to Lorentz lorentz's type, gaussian-shape, two order super shape, hyperbolic secant shape etc.The burst pulse seed laser that seed source produces, through subsequent optical fiber amplifier, finally realizes high power narrow-pulse laser and exports.Fig. 2 is respectively Lorentz lorentz's shape, gaussian-shape, hyperbolic secant shape and two order super shape from left to right.In figure, solid line represents the output waveform of seed laser, and dotted line represents the situation of change of seed laser output waveform after fiber amplifier.As can be seen from Figure 2, after fiber amplifier, the seed laser of two order super shape to narrow phenomenon the most obvious.
In above-mentioned structure as shown in Figure 1, the average power due to seed laser is far smaller than the pumping light power that fiber amplifier injects, and therefore inevitably can produce amplified spontaneous emission (ASE) in fiber amplifier process.When this high power pump, between pulse, amplifier gain can improve rapidly, and ASE can consequently reach capacity in run-up.The parasitic oscillation caused thus can consume the population of energy level, thus limits the energy be stored in active population form in gain fibre.ASE can reduce the amplification efficiency of fiber amplifier, and backward ASE also can cause damage to seed source, therefore must manage to be suppressed.
Summary of the invention
The invention provides suppressing method and the device of ASE in a kind of high power narrow pulse fiber laser, to solve the problem producing ASE in prior art in fiber amplifier process.
The invention provides the suppressing method of ASE in a kind of high power narrow pulse fiber laser, comprise: according to the output characteristic requirement of the Output of laser of high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Normal unlatching high power narrow pulse fiber laser, make the average power of the Output of laser of high power narrow pulse fiber laser meet output characteristic requirement, and use the pulse duration of the Output of laser of photodetector and oscilloscope detection high power narrow pulse fiber laser; When determining that the pulse duration detected does not meet output characteristic requirement, the pulse duration of the seed laser sent by pulse driving power modulation single mode laser diode seed source, makes the pulse duration of Output of laser meet output characteristic requirement.
Preferably, output characteristic requires to include: average power, repetition rate and pulse duration.
Preferably, the pulse duration of the seed laser sent by pulse driving power modulation single mode laser diode seed source, make the pulse duration of Output of laser meet output characteristic to require specifically to comprise: in setting output characteristic to require, pulse duration is as being less than or equal to X nanosecond, the pulse width modulation of the seed laser then sent by single mode laser diode seed source by pulse driving power is nX nanosecond, wherein, n is positive integer, by photodetector and oscilloscope detection when the pulse duration of seed laser is nX nanosecond, whether the pulse duration of Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now seed laser is final pulse duration, if the judgment is No, then continue through the modulation of pulse driving power, reduce the pulse duration of the seed laser that single mode laser diode seed source sends, and reduce the pulse duration of Output of laser after the pulse duration of seed laser by photodetector and oscilloscope detection, and the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Preferably, n equals 3.
Preferably, continue through the modulation of pulse driving power, reduce the pulse duration of the seed laser that single mode laser diode seed source sends, and after reducing the pulse duration of seed laser by photodetector and oscilloscope detection, the pulse duration of Output of laser, and the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration specifically comprises: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser sent by single mode laser diode seed source reduces by 1 nanosecond at every turn, and by the pulse duration of photodetector and oscilloscope detection seed laser every this reduce by 1 nanosecond time Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Present invention also offers the restraining device of ASE in a kind of high power narrow pulse fiber laser, comprise: the first modulation module, for the output characteristic requirement of the Output of laser according to high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Detecting module, for normally opening high power narrow pulse fiber laser, make the average power of the Output of laser of high power narrow pulse fiber laser meet output characteristic requirement, and use the pulse duration of the Output of laser of photodetector and oscilloscope detection high power narrow pulse fiber laser; Second modulation module, for when determining that the pulse duration detected does not meet output characteristic requirement, the pulse duration of the seed laser sent by pulse driving power modulation single mode laser diode seed source, makes the pulse duration of Output of laser meet output characteristic requirement.
Preferably, output characteristic requires to include: average power, repetition rate and pulse duration.
Preferably, second modulation module specifically comprises: the first modulation submodule, for pulse duration in requiring in output characteristic for being less than or equal to X nanosecond, the pulse width modulation of the seed laser sent by single mode laser diode seed source by pulse driving power is nX nanosecond, wherein, n is positive integer, second modulation submodule, for by photodetector and oscilloscope detection when the pulse duration of seed laser is nX nanosecond, whether the pulse duration of Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now seed laser is final pulse duration, if the judgment is No, then continue through the modulation of pulse driving power, reduce the pulse duration of the seed laser that single mode laser diode seed source sends, and reduce the pulse duration of Output of laser after the pulse duration of seed laser by photodetector and oscilloscope detection, and the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Preferably, n equals 3.
Preferably, second modulation submodule specifically for: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser sent by single mode laser diode seed source reduces by 1 nanosecond at every turn, and by the pulse duration of photodetector and oscilloscope detection seed laser every this reduce by 1 nanosecond time Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Beneficial effect of the present invention is as follows:
By accurately controlling the impulse waveform of the seed laser that seed source sends, guarantee that the pulse duration of seed laser can significantly be narrowed in fiber amplifier process, even if the pulse duration of seed laser is wider, still can ensure that laser that fiber laser finally exports meets the application requirement of narrow spaces, solve the problem producing ASE in prior art in fiber amplifier process, the average power of seed laser can be improved by the pulse duration increasing seed source seed laser, reach the object effectively suppressing ASE to produce.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and can become apparent, below especially exemplified by the specific embodiment of the present invention to allow above and other objects of the present invention, feature and advantage.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
The restraining device of ASE in Fig. 1 high power narrow pulse fiber laser;
Fig. 2 is the schematic diagram of the different output waveforms of seed laser in prior art;
Fig. 3 is the flow chart of the suppressing method of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention;
Fig. 4 is the structural representation of the high power burst pulse Yb-doped double-cladding fiber laser of the embodiment of the present invention;
Fig. 5 is the structural representation of the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
The average power increasing seed laser is one of most effectual way suppressing ASE.Due to the average power=peak power × pulse duration × repetition rate of seed laser pulse, under the condition that seed source repetition rate is certain, the object increasing seed laser average power can be reached by the method improving its peak power and/or pulse duration.But the peak power of the seed laser pulse that seed source sends is determined by its inherent characteristic, is applied to the limit at present, cannot continue to promote, therefore increase seed laser average power and only have the method considering the pulse duration increasing seed laser.
It should be noted that the pulse duration of seed laser can not increase arbitrarily.This is because, in the application of numerous high power narrow pulse fiber laser, there is concrete requirement to the pulse duration of final Output of laser, usually need to be limited in a certain scope.If increase arbitrarily the pulse duration of seed laser, in the process of follow-up multistage amplification, likely produce that pulsewidth narrows, pulsewidth is constant or the multiple phenomenon such as pulse stretcher.In this case, although the pulse duration of seed laser increases, the average power of seed laser can be increased, suppress ASE, but the output pulse width of laser after amplifying may be caused also greatly to increase, thus do not meet high power narrow pulse fiber laser to the requirement of output laser pulse width, the application of laser is extremely restricted.
In order to solve the problem producing ASE in prior art in fiber amplifier process, the invention provides suppressing method and the device of ASE in a kind of high power narrow pulse fiber laser, below in conjunction with accompanying drawing and embodiment, the present invention being further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, do not limit the present invention.
Embodiment of the method
According to embodiments of the invention, provide the suppressing method of ASE in a kind of high power narrow pulse fiber laser, Fig. 3 is the flow chart of the suppressing method of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention, as shown in Figure 3, following process is comprised according to the suppressing method of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention:
Step 301, according to the output characteristic requirement of the Output of laser of high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Wherein, output characteristic requires to include: average power, repetition rate and pulse duration.
Step 302, normal unlatching high power narrow pulse fiber laser, make the average power of the Output of laser of high power narrow pulse fiber laser meet output characteristic requirement, and use the pulse duration of the Output of laser of photodetector and oscilloscope detection high power narrow pulse fiber laser;
Step 303, when determining that the pulse duration detected does not meet output characteristic requirement, the pulse duration of the seed laser sent by pulse driving power modulation single mode laser diode seed source, makes the pulse duration of Output of laser meet output characteristic requirement.
Step 303 specifically comprises following process:
Step 1, set output characteristic to require in pulse duration as being less than or equal to X nanosecond, then the pulse width modulation of the seed laser sent by single mode laser diode seed source by pulse driving power is nX nanosecond, and wherein, n is positive integer;
Step 2, by photodetector and oscilloscope detection when the pulse duration of seed laser is nX nanosecond, whether the pulse duration of Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now seed laser is final pulse duration, if the judgment is No, then continue through the modulation of pulse driving power, reduce the pulse duration of the seed laser that single mode laser diode seed source sends, and reduce the pulse duration of Output of laser after the pulse duration of seed laser by photodetector and oscilloscope detection, and the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Preferably, n equals 3; In step 2, specifically comprise following process: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser sent by single mode laser diode seed source reduces by 1 nanosecond at every turn, and by the pulse duration of photodetector and oscilloscope detection seed laser every this reduce by 1 nanosecond time Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
That is, in embodiments of the present invention, first modulated the output waveform of the seed laser that single mode laser diode seed source sends by pulse driving power, make output waveform be two order super shape.Then normally open high power narrow pulse fiber laser, meet the condition of instructions for use in the average power of Output of laser under, use the pulse duration of photodetector and oscilloscope detection Output of laser.If the pulse duration of high power narrow pulse fiber laser Output of laser requires as being less than x nanosecond, the pulse duration of the seed laser that single mode laser diode seed source sends then is modulated by pulse driving power, first be modulated to 3x nanosecond, whether the pulse duration of the high power narrow pulse fiber laser Output of laser that observation is now corresponding, meet the requirement being less than x nanosecond.If do not meet the demands, then reduce the pulse duration of seed laser, from 3x nanosecond, 1 nanosecond of each minimizing, and the pulse duration simultaneously observing high power narrow pulse fiber laser Output of laser, until first fit is less than the requirement of x nanosecond.The pulse duration of now corresponding seed laser is and seed laser should be modulated the final pulse duration become.
Be specifically described for high power burst pulse Yb-doped double-cladding fiber laser below.Fig. 4 is the structural representation of the high power burst pulse Yb-doped double-cladding fiber laser of the embodiment of the present invention, as shown in Figure 4, this high power narrow pulse fiber laser adopts the laser diode of burst pulse electrical modulation as seed source (Seed), connects two-stage fiber amplifier structure (Pre-Amplifier and Power Amplifier) thereafter.The output characteristic of this fiber laser Output of laser requires as average power 50W, repetition rate 100kHz, pulse duration≤20ns.
Laser diode seed source adopts pulse driving power to drive, by adjusting the output parameter of its drive current directly modulation seed laser, as repetition rate, pulse duration, impulse waveform and watt level.
First modulated the repetition rate of the seed laser that single mode laser diode seed source sends by pulse driving power, be modulated to 100kHz.The output waveform of seed laser is modulated to two order super shape.Then normally open high power narrow pulse fiber laser, make the average power of Output of laser reach 50W.Now, the pulse duration of photodetector and oscilloscope detection Output of laser is used.The pulse duration of this high power narrow pulse fiber laser Output of laser requires as being less than 20ns, the pulse duration of the seed laser that single mode laser diode seed source sends then is modulated by pulse driving power, first be modulated to 60ns, the pulse duration of the high power narrow pulse fiber laser Output of laser that observation is now corresponding, does not meet the requirement being less than 20ns.The pulse duration of following minimizing seed laser, from 60ns, reduces 1ns at every turn, and observes the pulse duration of high power narrow pulse fiber laser Output of laser simultaneously, and when its first fit is less than the requirement of 20ns, the pulse duration of seed laser is 45ns.
Be 45ns by the pulse width modulation of seed laser, instead of the final 20ns required.This is because, through the amplification process of follow-up two-stage fiber amplifier, the pulse duration of seed laser there occurs and narrows phenomenon, when after amplifying, laser power reaches 50W, pulse duration can narrow to 20ns, thus meets the output pulse width requirement of this fiber laser.Like this, because the pulse duration of seed laser can be relaxed to 45ns, increase by 1.25 times when its average power just can be set to 20ns than pulse duration, improve the average power of seed laser, reach the object effectively suppressing ASE to produce.
In sum, by means of the technical scheme of the embodiment of the present invention, by accurately controlling the impulse waveform of the seed laser that seed source sends, guarantee that the pulse duration of seed laser can significantly be narrowed in fiber amplifier process.Like this, even if the pulse duration of seed laser is wider, still can ensure that laser that fiber laser finally exports meets the application requirement of narrow spaces.Adopt in this way, just can be improved the average power of seed laser by the pulse duration increasing seed source seed laser, reach the object effectively suppressing ASE to produce.
Device embodiment
According to embodiments of the invention, provide the restraining device of ASE in a kind of high power narrow pulse fiber laser, Fig. 5 is the structural representation of the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention, as shown in Figure 5, comprise according to the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the present invention: the first modulation module 50, detecting module 52 and the second modulation module 54, be described in detail the modules of the embodiment of the present invention below.
First modulation module 50, for the output characteristic requirement of the Output of laser according to high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Wherein, output characteristic requires to include: average power, repetition rate and pulse duration.
Detecting module 52, for normally opening high power narrow pulse fiber laser, make the average power of the Output of laser of high power narrow pulse fiber laser meet output characteristic requirement, and use the pulse duration of the Output of laser of photodetector and oscilloscope detection high power narrow pulse fiber laser;
Second modulation module 54, for when determining that the pulse duration detected does not meet output characteristic requirement, the pulse duration of the seed laser sent by pulse driving power modulation single mode laser diode seed source, makes the pulse duration of Output of laser meet output characteristic requirement.
Second modulation module 54 specifically comprises:
First modulation submodule, for pulse duration in requiring in output characteristic for being less than or equal to X nanosecond, the pulse width modulation of the seed laser sent by single mode laser diode seed source by pulse driving power is nX nanosecond, and wherein, n is positive integer; Preferably, n equals 3.
Second modulation submodule, for by photodetector and oscilloscope detection when the pulse duration of seed laser is nX nanosecond, whether the pulse duration of Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now seed laser is final pulse duration, if the judgment is No, then continue through the modulation of pulse driving power, reduce the pulse duration of the seed laser that single mode laser diode seed source sends, and reduce the pulse duration of Output of laser after the pulse duration of seed laser by photodetector and oscilloscope detection, and the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
Second modulation submodule specifically for:
By the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser sent by single mode laser diode seed source reduces by 1 nanosecond at every turn, and by the pulse duration of photodetector and oscilloscope detection seed laser every this reduce by 1 nanosecond time Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of Output of laser being less than or equal to X nanosecond is set to final pulse duration.
In sum, by accurately controlling the impulse waveform of the seed laser that seed source sends, guarantee that the pulse duration of seed laser can significantly be narrowed in fiber amplifier process, even if the pulse duration of seed laser is wider, still can ensure that laser that fiber laser finally exports meets the application requirement of narrow spaces, solve the problem producing ASE in prior art in fiber amplifier process, the average power of seed laser can be improved by the pulse duration increasing seed source seed laser, reach the object effectively suppressing ASE to produce.
Intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment with display at this algorithm provided.Various general-purpose system also can with use based on together with this teaching.According to description above, the structure constructed required by this type systematic is apparent.In addition, the present invention is not also for any certain programmed language.It should be understood that and various programming language can be utilized to realize content of the present invention described here, and the description done language-specific is above to disclose preferred forms of the present invention.
In specification provided herein, describe a large amount of detail.But can understand, embodiments of the invention can be put into practice when not having these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand in each inventive aspect one or more, in the description above to exemplary embodiment of the present invention, each feature of the present invention is grouped together in single embodiment, figure or the description to it sometimes.But, the method for the disclosure should be construed to the following intention of reflection: namely the present invention for required protection requires feature more more than the feature clearly recorded in each claim.Or rather, as claims below reflect, all features of disclosed single embodiment before inventive aspect is to be less than.Therefore, the claims following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and adaptively can change the module in the equipment in embodiment and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and multiple submodule or subelement or sub-component can be put them in addition.Except at least some in such feature and/or process or unit be mutually repel except, any combination can be adopted to combine all processes of all features disclosed in this specification (comprising adjoint claim, summary and accompanying drawing) and so disclosed any method or equipment or unit.Unless expressly stated otherwise, each feature disclosed in this specification (comprising adjoint claim, summary and accompanying drawing) can by providing identical, alternative features that is equivalent or similar object replaces.
In addition, those skilled in the art can understand, although embodiments more described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present invention and to form different embodiments.Such as, in the following claims, the one of any of embodiment required for protection can use with arbitrary compound mode.
All parts embodiment of the present invention with hardware implementing, or can realize with the software module run on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that the some or all functions of the some or all parts in the restraining device of ASE in the high power narrow pulse fiber laser that microprocessor or digital signal processor (DSP) can be used in practice to realize according to the embodiment of the present invention.The present invention can also be embodied as part or all equipment for performing method as described herein or device program (such as, computer program and computer program).Realizing program of the present invention and can store on a computer-readable medium like this, or the form of one or more signal can be had.Such signal can be downloaded from internet website and obtain, or provides on carrier signal, or provides with any other form.
The present invention will be described instead of limit the invention to it should be noted above-described embodiment, and those skilled in the art can design alternative embodiment when not departing from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and does not arrange element in the claims or step.Word "a" or "an" before being positioned at element is not got rid of and be there is multiple such element.The present invention can by means of including the hardware of some different elements and realizing by means of the computer of suitably programming.In the unit claim listing some devices, several in these devices can be carry out imbody by same hardware branch.Word first, second and third-class use do not represent any order.Can be title by these word explanations.
Claims (10)
1. a suppressing method of ASE in high power narrow pulse fiber laser, is characterized in that, comprising:
According to the output characteristic requirement of the Output of laser of high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of described seed laser is modulated to two order super shape;
Normal unlatching described high power narrow pulse fiber laser, make the average power of the Output of laser of described high power narrow pulse fiber laser meet described output characteristic requirement, and use photodetector and oscilloscope to detect the pulse duration of the Output of laser of described high power narrow pulse fiber laser;
When determining that the described pulse duration detected does not meet the requirement of described output characteristic, modulated the pulse duration of the described seed laser that described single mode laser diode seed source sends by described pulse driving power, make the pulse duration of described Output of laser meet described output characteristic requirement.
2. the method for claim 1, is characterized in that, described output characteristic requires to include: average power, repetition rate and pulse duration.
3. method as claimed in claim 2, it is characterized in that, modulated the pulse duration of the described seed laser that described single mode laser diode seed source sends by described pulse driving power, make the pulse duration of described Output of laser meet described output characteristic and require specifically to comprise:
If described output characteristic require described in pulse duration for being less than or equal to X nanosecond, then the pulse width modulation of the described seed laser sent by described single mode laser diode seed source by described pulse driving power is nX nanosecond, and wherein, n is positive integer;
By described photodetector and the detection of described oscilloscope when the pulse duration of described seed laser is nX nanosecond, whether the pulse duration of described Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now described seed laser is final pulse duration, if the judgment is No, then continue through the modulation of described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and reduce the pulse duration of described Output of laser after the pulse duration of described seed laser by described photodetector and the detection of described oscilloscope, and the pulse duration of seed laser corresponding when the pulse duration of described Output of laser being less than or equal to X nanosecond is set to described final pulse duration.
4. method as claimed in claim 3, it is characterized in that, n equals 3.
5. the method as described in claim 3 or 4, it is characterized in that, the described modulation continuing through described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and after reducing the pulse duration of described seed laser by described photodetector and the detection of described oscilloscope, the pulse duration of described Output of laser, and the pulse duration of seed laser corresponding when the pulse duration of described Output of laser being less than or equal to X nanosecond is set to described final pulse duration specifically comprises:
By the modulation of described pulse driving power, from described nX nanosecond, the pulse duration of the described seed laser sent by described single mode laser diode seed source reduces by 1 nanosecond at every turn, and by described photodetector and described oscilloscope detect the pulse duration of described seed laser every this reduce by 1 nanosecond time described Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of described Output of laser being less than or equal to X nanosecond is set to described final pulse duration.
6. a restraining device of ASE in high power narrow pulse fiber laser, is characterized in that, comprising:
First modulation module, for the output characteristic requirement of the Output of laser according to high power narrow pulse fiber laser, the repetition rate of the seed laser sent by pulse driving power modulation single mode laser diode seed source, and the output waveform of described seed laser is modulated to two order super shape;
Detecting module, for normally opening described high power narrow pulse fiber laser, make the average power of the Output of laser of described high power narrow pulse fiber laser meet described output characteristic requirement, and use photodetector and oscilloscope to detect the pulse duration of the Output of laser of described high power narrow pulse fiber laser;
Second modulation module, for when determining that the described pulse duration detected does not meet the requirement of described output characteristic, modulated the pulse duration of the described seed laser that described single mode laser diode seed source sends by described pulse driving power, make the pulse duration of described Output of laser meet described output characteristic requirement.
7. device as claimed in claim 6, it is characterized in that, described output characteristic requires to include: average power, repetition rate and pulse duration.
8. device as claimed in claim 7, it is characterized in that, described second modulation module specifically comprises:
First modulation submodule, for pulse duration described in requiring in described output characteristic for being less than or equal to X nanosecond, the pulse width modulation of the described seed laser sent by described single mode laser diode seed source by described pulse driving power is nX nanosecond, wherein, n is positive integer;
Second modulation submodule, for by described photodetector and the detection of described oscilloscope when the pulse duration of described seed laser is nX nanosecond, whether the pulse duration of described Output of laser is less than or equal to X nanosecond, if the judgment is Yes, then determine that the pulse duration of now described seed laser is final pulse duration, if the judgment is No, then continue through the modulation of described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and reduce the pulse duration of described Output of laser after the pulse duration of described seed laser by described photodetector and the detection of described oscilloscope, and the pulse duration of seed laser corresponding when the pulse duration of described Output of laser being less than or equal to X nanosecond is set to described final pulse duration.
9. device as claimed in claim 8, it is characterized in that, n equals 3.
10. as claimed in claim 8 or 9 device, is characterized in that, described second modulation submodule specifically for:
By the modulation of described pulse driving power, from described nX nanosecond, the pulse duration of the described seed laser sent by described single mode laser diode seed source reduces by 1 nanosecond at every turn, and by described photodetector and described oscilloscope detect the pulse duration of described seed laser every this reduce by 1 nanosecond time described Output of laser pulse duration, the pulse duration of seed laser corresponding when the pulse duration of described Output of laser being less than or equal to X nanosecond is set to described final pulse duration.
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| CN201310120539.6A CN103219640B (en) | 2013-04-09 | 2013-04-09 | Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser |
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| CN201310120539.6A CN103219640B (en) | 2013-04-09 | 2013-04-09 | Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser |
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| CN103219640B true CN103219640B (en) | 2015-06-10 |
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