CN104034515B - The unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light - Google Patents
The unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light Download PDFInfo
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- CN104034515B CN104034515B CN201410269631.3A CN201410269631A CN104034515B CN 104034515 B CN104034515 B CN 104034515B CN 201410269631 A CN201410269631 A CN 201410269631A CN 104034515 B CN104034515 B CN 104034515B
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Abstract
Pattern wild effect on-line monitoring method in the high-capacity optical fiber laser that the present invention relates to survey based on scattered light. There is the rear fast-changing feature of flashlight light distribution meeting according to target at circuit theory and pattern wild effect, utilize the diffuse reflection surface light distribution information that scattered light carries to carry out Real-Time Monitoring to pattern wild effect in high-capacity optical fiber laser. The present invention can break through the unstable on-line monitoring method of pattern in existing high power optical fibre laser and exist the deficiency of light path complexity, realizes the undisturbed Real-Time Monitoring of pattern wild effect in high-capacity optical fiber laser.
Description
Technical field
The present invention relates to the on-line monitoring of pattern wild effect in high-capacity optical fiber laser, especially a kind of based on loosePenetrate optical detection pattern wild effect in high-capacity optical fiber laser is carried out to undisturbed on-line real time monitoring method.
Background technology
In recent years, along with the development of high-brightness semiconductor pump technology and doubly clad optical fiber manufacturing process, optical fiber laserPower output strided forward the threshold of myriawatt magnitude. Due to the special Wave guide structure of optical fiber, laser energy is all constrained on micro-In the fiber core of meter level, therefore, along with the raising of laser output power, fiber core self-energy very high density, very easily drawsPlay various destructive nonlinear effects. The power density that increase fiber core size, reduces in fibre core is to avoid non-linear effectOne of effective ways that should produce. But, increase fiber core size and inevitably can make optical fiber support multiple patterns, therebyCausing another nonlinear effect---pattern wild effect, power output reaches after certain threshold value, optical-fiber laser defeatedGo out pattern and become from stable basic mode the unstable state pattern that energy shifts rapidly in time between basic mode and high-order mode. Pattern is notStabilization can cause laser beam quality to decrease sharply, and has become the maximum constraints of high-capacity optical fiber laser power ascensionOne of factor. Whether real time on-line monitoring pattern wild effect occurs, is the major issue of high-capacity optical fiber laser research,Also be one of technical problem of paying close attention to of those skilled in the art. Realize at present the unstable real-time measurement of high power optical fibre laser patternMethod be adopt optical spectroscope part spectrophotometric test method [H.Otto, F.Stutzki, F.Jansen, T.Eidam,C.Jauregui,J.Limpert,A.Tunnerman,“Temporaldynamicsofmodeinstabilitiesinhighpowerfiberlasersandamplifiers,”OpticsExpress,2012,1103:15710-15722]. Said method adopts space structure and need on emitting light path, insert optics (spectroscope etc.), has increased systemComplexity, and Output of laser is caused to unnecessary disturbance, affect follow-up light velocity measurement. In addition, high power laser light is to insertingThe damage-resistant that enters Laser Transmission light path devices has proposed challenge. Therefore, in actual applications, the beam splitting type of introducing is above onlineThe method of monitoring high power optical fibre laser pattern wild effect is also not suitable for the pattern shakiness in high-capacity optical fiber laserDetermine phenomenon and carry out real time on-line monitoring.
Summary of the invention
The technical problem to be solved in the present invention is: for the unstable on-line monitoring side of pattern in existing high power optical fibre laserThere is light path complexity in method, is difficult to be applied to the deficiency of the unstable on-line monitoring of pattern in high-capacity optical fiber laser, invented onePlant the method that is applicable to the unstable on-line monitoring of pattern in high-capacity optical fiber laser, adopt the method system can realize Gao GongThe unsettled undisturbed Real-Time Monitoring of pattern in rate optical fiber laser amplifier.
Know-why of the present invention is: high power optical fibre laser is transferred to diffuse reflection surface, through diffuse reflection surface scatteringIn optical signal, include light distribution information [M.A.Vorontsov, V.Kolosov. " Target-in-the-in targetloopbeamcontrol:basicconsiderationsforanalysisandwave-frontsensing.”J.Opt.Soc.Am.A, 2005,22:126-141.]. By surveying the optical signal of scattering, can monitor the light intensity of diffuse reflection surfaceBe distributed with unchanged: in the time there is no pattern wild effect, the light distribution of diffuse reflection surface is stable, detect to such an extent that signal is straightStream signal; After pattern wild effect occurs, the light distribution meeting of diffuse reflection surface changes fast, and the signal detecting isThe oscillator signal of volt. Therefore, can Real-Time Monitoring pattern wild effect by monitoring scattered light signal.
Concrete technical scheme is as follows:
The present invention is made up of diffuse reflection surface and Photodetection system, it is characterized in that: described Photodetection system comprisesPhotodetector and oscillograph; Photodetector is connected with coaxial cable with oscillograph; Photodetector is placed on described unrestrained anti-Near reflective surface, for collecting and survey scattered light, and the signal detecting is input to oscillograph; Oscillograph is for supervising in real timeSurvey and analyze aforementioned photo detector signal; In the time there is no pattern wild effect, the light distribution of diffuse reflection surface is stable, frontStating photo detector signal is direct current signal; After pattern wild effect occurs, the light distribution meeting of diffuse reflection surface is quickChange, aforementioned photo detector signal is the oscillator signal rising and falling.
Concrete, photodetector described in the present invention can increase the optics such as lens, for strengthening collection scatteringLuminous energy power.
Concrete, the size of diffuse reflection surface described in the present invention is greater than the size of laser facula, can by arbitrarily coarse,Irreflexive material is made.
Concrete, diffuse reflection surface described in the present invention is power meter target surface.
Concrete, the characteristic frequency of oscillator signal described in the present invention is KHz magnitude.
Adopt the present invention can reach following technique effect:
1 the present invention is can be to the pattern in high-capacity optical fiber laser unstable carries out real-time undisturbed on-line monitoring, avoidsImpact on the application of follow-up laser;
2 the present invention are can be to the pattern in the high-capacity optical fiber laser of space structure unstable to be carried out real-time undisturbed and existsLine monitoring, again can be to the pattern in the high-capacity optical fiber laser of all optical fibre structure unstablely carries out real-time undisturbed and supervises onlineSurvey;
3 the present invention can be by changing dissimilar photodetector, for the high-capacity optical fiber laser of different wave lengthMiddle pattern wild effect monitoring;
4 the present invention do not need accurate measure and control device, simple in structure, cost low and also easily implement;
Brief description of the drawings
Fig. 1 the present invention is based on the unstable monitoring method schematic diagram of optical-fiber laser pattern that scattered light is surveyed.
Fig. 2 be the present invention is based on scattered light survey the unstable monitoring method application example of optical-fiber laser pattern in monitorPattern wild effect.
Wherein: 1-high power optical fibre laser; 2-scattering surface; 3-scattered signal light; 4-photodetector; 5-oscillograph.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Detailed description of the invention
As shown in Figure 1, high power optical fibre laser 1 is transferred to scattering surface 2, then through scattering surface 2 scatterings. Utilize photoelectricityDetector 4 is surveyed scattered signal light 3, and detectable signal is inputted to oscillograph 5. Can be real to the signal of oscillograph 5 by monitoringPattern wild effect in existing real time on-line monitoring high-capacity optical fiber laser.
Provide a concrete embodiment of the present invention below:
In high power jointed fiber laser instrument, high power laser light is outputed to power meter diffuse reflection target surface after collimationUpper, most of laser energy is absorbed by power meter target surface, and few portion of energy is by the diffuse reflecting target area scattering of power meter. By lightElectric explorer is placed near power meter target surface, the test surface of guaranteeing photodetector towards laser facula on power meter target surfacePosition, guarantee that photodetector can not block laser optical path simultaneously. Utilize photodetector to survey from the scattering of power meter target surfaceFlashlight, coordinate oscillograph to complete the on-line monitoring of pattern wild effect. Monitoring result is as shown in Figure 2: do not have pattern notWhile stablizing, record signal as shown in Fig. 2 (a), signal by a small margin, caused by the disturbance of experimental situation when low frequency fluctuation; MouldWhen formula wild effect occurs, record signal as shown in Fig. 2 (b), signal has significantly high frequency to rise and fall. At this application exampleIn, this monitoring method success Real-Time Monitoring pattern wild effect.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited to above-mentioned enforcementExample, all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention. It should be pointed out that for the artThose of ordinary skill, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications alsoShould be considered as protection scope of the present invention.
Claims (4)
1. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light, by diffuse reflection surface and photodetection isSystem composition, is characterized in that: described Photodetection system comprises photodetector and oscillograph; Photodetector and oscillograph are usedCoaxial cable is connected; Photodetector is placed near described diffuse reflection surface, for collecting and survey scattered light, and will surveyTo signal be input to oscillograph; Oscillograph is for Real-Time Monitoring and analyze aforementioned photo detector signal; When not having pattern notWhen stabilization, the light distribution of diffuse reflection surface is stable, and aforementioned photo detector signal is direct current signal; When pattern unstableAfter phenomenon occurs, the light distribution meeting of diffuse reflection surface changes fast, and aforementioned photo detector signal is the oscillator signal rising and falling.
2. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light according to claim 1, its feature existsIn: described photodetector increases lens optics, for strengthening the scattered light ability of collecting.
3. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light according to claim 1, its feature existsIn: the size of described diffuse reflection surface is greater than the size of laser facula, is made up of coarse, irreflexive material arbitrarily.
4. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light according to claim 3, its feature existsIn: described diffuse reflection surface is power meter target surface.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI642969B (en) * | 2017-12-05 | 2018-12-01 | 逢甲大學 | Light path rendering method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106442276A (en) * | 2016-10-14 | 2017-02-22 | 中国人民解放军国防科学技术大学 | Device and method for judging whether biological cells are captured successfully in optical stretcher |
| CN110455495B (en) * | 2019-07-31 | 2021-05-11 | 华中科技大学鄂州工业技术研究院 | Fiber laser mode stability detection device and method |
| CN114152335B (en) * | 2021-12-02 | 2023-11-03 | 中国电子科技集团公司第四十六研究所 | Measuring device for optical fiber photodarkening and using method |
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| CN103259173A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Radio frequency modulation tunable all-fiber laser with stable power control |
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| US7916307B2 (en) * | 2006-12-22 | 2011-03-29 | Lockheed Martin Corporation | Pre-amplifier for detection lasers within laser ultrasonic inspection systems |
| JP2014060251A (en) * | 2012-09-18 | 2014-04-03 | Spectronix Corp | Optical power monitoring device, optical power monitoring method, and laser generator using optical power monitoring device |
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| CN2665682Y (en) * | 2003-12-01 | 2004-12-22 | 中国科学院安徽光学精密机械研究所 | Device for measuring diffuse reflection integral laser power energy |
| CN103259173A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Radio frequency modulation tunable all-fiber laser with stable power control |
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