CN104034515A - Scattered light detection based fiber laser mode unstable monitoring method - Google Patents
Scattered light detection based fiber laser mode unstable monitoring method Download PDFInfo
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- CN104034515A CN104034515A CN201410269631.3A CN201410269631A CN104034515A CN 104034515 A CN104034515 A CN 104034515A CN 201410269631 A CN201410269631 A CN 201410269631A CN 104034515 A CN104034515 A CN 104034515A
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Abstract
The invention relates to a scattered light detection based online monitoring method for mode instability in a high power fiber laser. The scattered light detection based online monitoring method for the mode instability in the high power fiber laser monitors the mode instability in the high power fiber laser in real time through diffuse reflection surface light intensity distribution information carried by scattered light according to a target character that the signal light intensity distribution rapidly changes under circuit principle and generation of the mode instability. The scattered light detection based online monitoring method for the mode instability in the high power fiber laser can break the disadvantage that a light path is complex in the existing mode instability online monitoring method in the high power fiber laser and achieves non-disturbance real-time monitoring of the mode instability in the high power 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 ofly based on scattered light, survey 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, the output power of fiber laser has strided forward the threshold of myriawatt magnitude.Due to the special Wave guide structure of optical fiber, laser energy is all constrained in micron-sized fiber core, and therefore, along with the raising of laser output power, fiber core self-energy very high density, very easily causes various destructive nonlinear effects.The power density that increases fiber core size, reduces in fibre core is one of effective ways of avoiding nonlinear effect generation.But, increasing fiber core size inevitably can make optical fiber support a plurality of patterns, thereby cause another nonlinear effect---pattern wild effect, be that output power reaches after certain threshold value, the output mode of optical-fiber laser becomes from stable basic mode the unstable state pattern that energy shifts rapidly in time between basic mode and high-order mode.Pattern wild effect can cause laser beam quality to decrease sharply, and has become one of maximum constraints factor of high-capacity optical fiber laser power ascension.Whether real time on-line monitoring pattern wild effect occur, is the major issue of high-capacity optical fiber laser research, is also one of technical matters of paying close attention to of those skilled in the art.The method that realizes at present the unstable real-time measurement of high power optical fibre laser pattern is to adopt optical spectroscope part spectrophotometric test method [H.Otto, F.Stutzki, F.Jansen, T.Eidam, C.Jauregui, J.Limpert, A.Tunnerman, " Temporal dynamics of mode instabilities in high power fiber lasers and amplifiers, " Optics Express, 2012,1103:15710-15722].Said method adopts space structure and need on emitting light path, insert optical device (spectroscope etc.), has increased the complicacy of system, and Output of laser is caused to unnecessary disturbance, affects follow-up light velocity measurement.In addition, high power laser light has proposed challenge to inserting the damage-resistant of Laser Transmission light path devices.Therefore, in actual applications, the method for the beam splitting type on-line monitoring high power optical fibre laser pattern wild effect of introducing above is also not suitable for the pattern wild effect in high-capacity optical fiber laser to 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 method of pattern in existing high power optical fibre laser, exist light path complicated, be difficult to be applied to the deficiency of the unstable on-line monitoring of pattern in high-capacity optical fiber laser, invent a kind of method that is applicable to the unstable on-line monitoring of pattern in high-capacity optical fiber laser, adopted the method system can realize the unsettled undisturbed Real-Time Monitoring of pattern in high power optical fibre laser amplifier.
Know-why of the present invention is: high power optical fibre laser is transferred to diffuse reflection surface, in the light signal of diffuse reflection surface scattering, include the light distribution information [M.A.Vorontsov in target, V.Kolosov. " Target-in-the-loop beam control:basic considerations for analysis and wave-front sensing. " J.Opt.Soc.Am.A, 2005,22:126-141.].By surveying the light signal of scattering, the light distribution that can monitor diffuse reflection surface has unchanged: when there is no pattern wild effect, the light distribution of diffuse reflection surface is stable, detects to such an extent that signal is direct current signal; After pattern wild effect occurs, the light distribution meeting of diffuse reflection surface changes fast, the oscillator signal of the signal detecting for rising and falling.Therefore, can Real-Time Monitoring pattern wild effect by monitoring scattered light signal.
Concrete technical scheme is as follows:
The present invention is comprised of diffuse reflection surface and Photodetection system, it is characterized in that: described Photodetection system comprises photodetector and oscillograph; Photodetector is connected with concentric cable with oscillograph; Photodetector is placed near described diffuse reflection surface, for collecting and survey scattered light, and the signal detecting is input to oscillograph; Oscillograph is for Real-Time Monitoring and analyze aforementioned photo detector signal; When there is no pattern wild effect, the light distribution of diffuse reflection surface is stable, and aforementioned photo detector signal is direct current signal; After pattern wild effect occurs, the light distribution meeting of diffuse reflection surface changes fast, the oscillator signal of aforementioned photo detector signal for rising and falling.
Concrete, photodetector described in the present invention can increase the optical device such as lens, for strengthening the scattered light ability of collecting.
Concrete, the size of diffuse reflection surface described in the present invention is greater than the size of laser facula, can be made by coarse, irreflexive material arbitrarily.
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, has avoided the impact on follow-up laser application;
2 the present invention are can be to the pattern in the high-capacity optical fiber laser of space structure unstable carries out real-time undisturbed on-line 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 on-line monitoring;
3 the present invention can be by changing dissimilar photodetector, for the high-capacity optical fiber laser pattern wild effect monitoring of different wave length;
4 the present invention do not need accurate measure and control device, simple in structure, and cost is low and easily implement;
Accompanying drawing explanation
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 the present invention is based on the pattern wild effect monitoring in the unstable monitoring method application example of optical-fiber laser pattern of scattered light detection.
Wherein: 1-high power optical fibre laser; 2-scattering surface; 3-scattered signal light; 4-photodetector; 5-oscillograph.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
As shown in Figure 1, high power optical fibre laser 1 is transferred to scattering surface 2, then through scattering surface 2 scatterings.Utilize photodetector 4 to survey scattered signal light 3, and detectable signal is inputted to oscillograph 5.By monitoring, to the signal of oscillograph 5, can realize the pattern wild effect in 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 on power meter diffuse reflection target surface after collimation, 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.Photodetector is placed near power meter target surface, and the test surface of guaranteeing photodetector is the position on power meter target surface towards laser facula, guarantees that photodetector can not block laser optical path simultaneously.Utilize photodetector to survey the flashlight from the scattering of power meter target surface, coordinate oscillograph to complete the on-line monitoring of pattern wild effect.Monitoring result is as shown in Figure 2: while not having pattern unstable, record signal as shown in Fig. 2 (a), signal by a small margin, by the disturbance of experimental situation, caused during low frequency fluctuation; When pattern wild effect occurs, record signal as shown in Fig. 2 (b), signal has significantly high frequency to rise and fall.In this application example, 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-described embodiment, and 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 those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should 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, is comprised of diffuse reflection surface and Photodetection system, it is characterized in that: described Photodetection system comprises photodetector and oscillograph; Photodetector is connected with concentric cable with oscillograph; Photodetector is placed near described diffuse reflection surface, for collecting and survey scattered light, and the signal detecting is input to oscillograph; Oscillograph is for Real-Time Monitoring and analyze aforementioned photo detector signal; When there is no pattern wild effect, the light distribution of diffuse reflection surface is stable, and aforementioned photo detector signal is direct current signal; After pattern wild effect occurs, the light distribution meeting of diffuse reflection surface changes fast, the oscillator signal of aforementioned photo detector signal for rising and falling.
2. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light according to claim 1, is characterized in that: described photodetector increases the optical device such as lens, 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, is characterized in that: the size of described diffuse reflection surface is greater than the size of laser facula, by coarse, irreflexive material arbitrarily, is made.
4. the unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light according to claim 3, is characterized in that: described diffuse reflection surface is power meter target surface.
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Cited By (3)
| 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 |
| CN110455495A (en) * | 2019-07-31 | 2019-11-15 | 华中科技大学鄂州工业技术研究院 | A kind of optical fiber laser mode stability detection device and method |
| CN114152335A (en) * | 2021-12-02 | 2022-03-08 | 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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| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110455495A (en) * | 2019-07-31 | 2019-11-15 | 华中科技大学鄂州工业技术研究院 | A kind of optical fiber laser mode stability detection device and method |
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| CN114152335A (en) * | 2021-12-02 | 2022-03-08 | 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 |
| 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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