CN103227406A - Passive mode-locking optical fiber laser device - Google Patents
Passive mode-locking optical fiber laser device Download PDFInfo
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- CN103227406A CN103227406A CN2013101558152A CN201310155815A CN103227406A CN 103227406 A CN103227406 A CN 103227406A CN 2013101558152 A CN2013101558152 A CN 2013101558152A CN 201310155815 A CN201310155815 A CN 201310155815A CN 103227406 A CN103227406 A CN 103227406A
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Abstract
The invention discloses a passive mode-locking optical fiber laser device which comprises a passive mode-locking optical fiber laser device resonant cavity, an electric control optical fiber polarization controller, a light beam splitter, a photoelectric detector, a laser output port and a liquid crystal display module, wherein the photoelectric detector receives a laser signal of the light beam splitter, converts the laser signal into an electric signal and then inputs the electric signal to a feedback control module, and the feedback control module analyzes and processes the electric signal, and then outputs voltage to control the electric control optical fiber polarization controller to automatically adjust a polarization state in the laser resonant cavity. A feedback control system for the passive mode-locking optical fiber laser device comprises a feedback circuit system and the electric control optical fiber polarization controller. The system can automatically monitor and precisely control the passive mode-locking optical fiber laser device in real time, so that the performance of the passive mode-locking laser device can be improved greatly.
Description
Technical field
The present invention relates to the fiber laser field, the particularly a kind of passive mode-locking fiber laser that can adjust the laser polarization state of the automatically controlled Polarization Controller of optical fiber automatically and can judge whether to enter best laser polarization state automatically.
Background technology
Mode-locked laser is the main means that produce ultrashort pulse (fs-ps).There is certain longitudinal mode for specific laser resonant cavity, when laser surpasses pumping threshold, as there not being the frequency-selecting device in the fruit caving, then all longitudinal modes that satisfy condition of resonance all will begin to participate in vibration, but the laser that does not add longitudinal mode control usually is in free-running operation, just do not have fixed phase relation between each longitudinal mode, consequently the output of laser is only continuous, can't obtain periodic laser pulse.And being the relative phase that will satisfy each longitudinal mode of starting condition for oscillation, the basic principle of locked mode locks with certain form, on the time coordinate axle, some the time engrave, all oscillation modes all arrive the position of amplitude maximum simultaneously, the ultrashort pulse sequence that coherent superposition forms periodically, intensity greatly improves, this mode locking pulse sequence also can be understood as the relevant bright fringes on the time-domain.
Passive mode locking is to add the passive mode locking device in laser chamber, and for example saturable absorber perhaps utilizes nonlinear effect to make the fiber laser cavity equivalence become a saturable absorber, as NALM etc.Make pulse when the locked mode device, the loss minimum at prominent peak place, and the loss on the lower edge, front and back of power is bigger.After circulation repeatedly, and when satisfying the laser starting condition for oscillation, forms stable ultrashort pulse and export.
Laser with active-passive lock mould is simple in structure, is real full optical fibre device, utilizes the nonlinear effect of optical fiber, can produce the shortest optical pulse, and need not any active device in the laser cavity.It can make full use of the gain bandwidth of doped fiber, theoretically, can directly produce femtosecond (fs) light pulse.Passive mode-locking fiber laser is to utilize the nonlinear effect of optical fiber to realize locked mode, thus its weak point to be to export the stability of pulse repetition frequency poor, can not be extraneous regulate and control.Because fiber laser has the wide bandwidth advantage, utilizing the nonlinear polarization rotation and utilizing nonlinear optical fiber annular mirror is the most effectual way that produces ultrashort pulse at present.
But the biggest obstacle in the actual use of passive mode-locking fiber laser at present is the self-starting difficulty, and in servicely influenced by extraneous factor usually to cause unstable working condition, even loses mode-lock status fully.Main cause is the very large nonlinear phase shift that long fiber lengths causes, and the variation of temperature and pressure also causes the fluctuation of the fiber birefringence amplitude in the locked mode process.At the problems referred to above and defective need provide a kind of can real-time automatic monitoring and accurate control passive mode-locking fiber laser, effectively address the above problem, the performance of laser with active-passive lock mould is done is significantly improved.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of passive mode-locking fiber laser, its objective is that solving the external environment factor affecting causes laser to be difficult to the problem that optimum Working is easily lost, is difficult to reach in self-starting, unstable working condition, mode-lock status.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of passive mode-locking fiber laser, it comprises passive mode-locking fiber laser resonant cavity, automatically controlled optical fiber polarization controller, beam splitter, photodetector, laser output mouth, LCD MODULE, described photodetector is accepted the laser pulse signal of beam splitter, import feedback control module after being converted to the signal of telecommunication, output voltage is controlled automatically controlled optical fiber polarization controller after the feedback control module analyzing and processing, regulates polarization state in the laser chamber automatically.
Described automatically controlled optical fiber polarization controller is made of piezoelectric ceramic and optical fiber, by being applied to the voltage extruding optical fiber on the piezoelectric ceramic, can regulate the light field polarization state in the optical fiber, this automatically controlled optical fiber polarization controller inserts laserresonator by fused fiber splice, and laserresonator keeps all optical fibre structure.
Following method realizes the automatically controlled Polarization Controller laser polarization state of optical fiber in the passive mode-locking fiber laser is regulated automatically: photodetector receives the laser signal of beam splitter, import feedback control module after being converted to electric impulse signal, described feedback control module will import circuit after amplifier from the electric impulse signal that photodetector receives, comparator obtains the PECL level pulse, take a sample into 3.3V standard LVTTL square wave through the high speed frequency division again, after passing through the frequency reducing of low speed frequency divider again, with the single-chip microcomputer is that core is to the above-mentioned square wave counting that provides, the control voltage of while FEEDBACK CONTROL digital to analog converter DAC output, this voltage is carried in the automatically controlled Polarization Controller adjusted of optical fiber laser polarization state after amplifying, thereby regulates the laser works state.
Judge whether passive mode-locking fiber laser enters the method for optimum Working: output signal should be equidistant during the laser optimum Working, the periodic pulse train of equal altitudes, so described feedback control module, by feedback control module control comparator threshold voltage, between the maximum impulse voltage that 0V voltage to detector is gathered, with 10% is stepping, progressively regulate comparator threshold voltage from height to hanging down, under different threshold voltages, signal is made a decision successively, if the count value under all threshold voltages all is judged as correctly, think that then laser enters optimum Working, otherwise then think and do not enter optimum Working.
Pass through technique scheme, passive mode-locking fiber laser provided by the invention, passive mode-locking fiber laser resonant cavity output laser is directly exported by output port through a beam splitter part, a part enters photodetector, laser signal is converted into the signal of telecommunication enters feedback control module, feedback control module is made judgement according to the signal that provides, and then control automatically controlled optical fiber polarization controller, enter optimum Working up to mode-locked laser, and can lock control voltage maintenance laser works state.The present invention is directed to the feedback control system of passive mode-locking fiber laser, comprise feedback circuitry and automatically controlled optical fiber polarization controller.This system can make the performance of laser with active-passive lock mould significantly improve with accurate control passive mode-locking fiber laser by real-time automatic monitoring.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below.
Fig. 1 is the structure principle chart of passive mode-locking fiber laser of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.
Present embodiment as shown in Figure 1, a kind of passive mode-locking fiber laser, it comprises passive mode-locking fiber laser resonant cavity 1, automatically controlled optical fiber polarization controller 2, beam splitter 3, photodetector 4, laser output mouth 6, LCD MODULE 7, described photodetector 4 is accepted the laser signal of beam splitter 3, import feedback control module 5 after being converted to the signal of telecommunication, output voltage is controlled automatically controlled optical fiber polarization controller 2 after feedback control module 5 analyzing and processing, regulates polarization state in the laser resonant cavity 1 automatically.
Described automatically controlled optical fiber polarization controller 2 is made of piezoelectric ceramic and optical fiber, by being applied to the voltage extruding optical fiber on the piezoelectric ceramic, can regulate the light field polarization state in the optical fiber, this automatically controlled optical fiber polarization controller 2 inserts laserresonator 1 by fused fiber splice, and laserresonator 1 keeps all optical fibre structure.
Realize the automatically controlled Polarization Controller laser polarization state of optical fiber in the passive mode-locking fiber laser is transferred automatically by following method by said structure: photodetector 4 receives the laser signal of beam splitter 3, be converted to input feedback control module 5 behind the electric pulse number, described feedback control module 5 will import circuit after amplifier from the electric impulse signal that photodetector 4 receives, comparator obtains the PECL level pulse, take a sample into 3.3V standard LVTTL square wave through the high speed frequency division again, after passing through the frequency reducing of low speed frequency divider again, with the single-chip microcomputer is that core is to the above-mentioned square wave counting that provides, the control voltage of FEEDBACK CONTROL digital to analog converter DAC output is carried in the automatically controlled Polarization Controller adjusted of optical fiber laser polarization state after this voltage process is amplified simultaneously.
Whether enter optimum Working through following method with the affirmation laser polarization state: by feedback control module 5 control comparator threshold voltages, between the maximum impulse voltage that 0V voltage to detector is gathered, with 10% is stepping, progressively regulate comparator threshold voltage from height to hanging down, under different threshold voltages, signal is made a decision successively, if the count value under all threshold voltages all is judged as correctly, think that then laser enters optimum Working, otherwise then think and do not enter optimum Working.Because every stand lock mode fiber laser output laser is periodic pulse signal, pulse repetition frequency is determined value and keeps stable, be that the laser pulse that the unit interval planted agent produces is known, therefore count by the laser pulse signal that detector is collected, can judge whether laser is operated in optimum Working.
Passive mode-locking fiber laser provided by the invention, passive mode-locking fiber laser resonant cavity 1 output laser is directly exported by output port through beam splitter 3 parts, a part enters photodetector 4, laser signal is converted into the signal of telecommunication enters feedback control module 5, feedback control module 5 is made judgement according to the signal that provides, and then control automatically controlled optical fiber polarization controller 2, enter optimum Working up to mode-locked laser, and can lock and keep the laser works state and the operating state of laser is shown in real time in LCD MODULE 7.The present invention is directed to the feedback control system of passive mode-locking fiber laser design, comprise feedback circuitry and automatically controlled optical fiber polarization controller 2.This system can control passive mode-locking fiber laser with precision by real-time automatic monitoring, and the performance that is used for laser with active-passive lock mould is significantly improved.
Need to prove especially, the present invention not only provides a kind of can regulate, lock the passive mode-locking fiber laser that keeps the laser works state automatically, and provide the automatically controlled Polarization Controller of optical fiber of realizing adjusting automatically above-mentioned passive mode-locking fiber laser laser polarization state method and judge whether the laser polarization state of the automatically controlled Polarization Controller of optical fiber enters the method for optimum Working.It is interrelated technically whether the method for the laser polarization state of the automatically controlled Polarization Controller of optical fiber of described passive mode-locking fiber laser and passive mode-locking fiber laser and the laser polarization state of judging the automatically controlled Polarization Controller of optical fiber enter between the method for optimum Working, comprised a plurality of identical or relevant art features.Need to prove simultaneously the LCD MODULE 7 described in the present invention, feedback control module 5 be in the prior art common technological means, it is not a technical problem to be solved in the present invention, the problem to be solved in the present invention is by to the in-built improvement of laser with active-passive lock mould, and realize automatic adjustment to laser polarization state in conjunction with determination methods, make the significantly improved purpose of performance of laser with active-passive lock mould to reach real-time automatic monitoring and accurate control passive mode-locking fiber laser.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (4)
1. passive mode-locking fiber laser, it comprises passive mode-locking fiber laser resonant cavity, automatically controlled optical fiber polarization controller, beam splitter, photodetector, laser output mouth, LCD MODULE, it is characterized in that: described photodetector is accepted the laser signal of beam splitter, import feedback control module after being converted to the signal of telecommunication, output voltage is controlled automatically controlled optical fiber polarization controller after the feedback control module analyzing and processing, regulates polarization state in the laser chamber automatically.
2. according to the described a kind of passive mode-locking fiber laser of claim 1, it is characterized in that: described automatically controlled optical fiber polarization controller is made of piezoelectric ceramic and optical fiber, by being applied to the voltage extruding optical fiber on the piezoelectric ceramic, can regulate the light field polarization state in the optical fiber, this automatically controlled optical fiber polarization controller inserts laserresonator by fused fiber splice, and the laser resonance cavity segment keeps all optical fibre structure.
3. method of regulating the automatically controlled Polarization Controller laser polarization state of optical fiber in the described passive mode-locking fiber laser of claim 1, it is characterized in that: photodetector receives the laser signal of beam splitter, import feedback control module after being converted to electric pulse number, described feedback control module will import circuit after amplifier from the electric impulse signal that photodetector receives, comparator obtains the PECL level pulse, take a sample into 3.3V standard LVTTL square wave through the high speed frequency division again, after passing through the frequency reducing of low speed frequency divider again, with the single-chip microcomputer is that core is to the above-mentioned square wave counting that provides, the control voltage of FEEDBACK CONTROL digital to analog converter DAC output is carried in the automatically controlled Polarization Controller adjusted of optical fiber laser polarization state after this voltage process is amplified simultaneously.
4. judge whether the described passive mode-locking fiber laser of claim 1 enters the method for optimum Working for one kind, it is characterized in that: described feedback control module, by feedback control module control comparator threshold voltage, between the maximum impulse voltage that the 0V voltage detector is gathered, with 10% is stepping, progressively regulate comparator threshold voltage from height to hanging down, under different threshold voltages, signal is made a decision successively, if the count value under all threshold voltages all is judged as correctly, think that then laser enters optimum Working, otherwise then think and do not enter optimum Working.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN104538825A (en) * | 2015-01-13 | 2015-04-22 | 上海朗研光电科技有限公司 | Method for detecting stability of mode locking signals in self-starting process of fiber laser |
| CN105449517A (en) * | 2015-12-16 | 2016-03-30 | 中国科学院国家授时中心 | Stabilizing apparatus and stabilizing method for linear polarization laser polarization and power |
| CN106451053A (en) * | 2016-08-17 | 2017-02-22 | 北京无线电计量测试研究所 | Mode-locked state detection method and device |
| CN108539571A (en) * | 2018-04-08 | 2018-09-14 | 上海交通大学 | A kind of fast automatic mode locking method covering multimode pulse recognition |
| CN108683066A (en) * | 2018-06-26 | 2018-10-19 | 中国科学技术大学 | A kind of passive mode-locking optical-fiber laser locking device based on array waveguide grating |
| CN108963733A (en) * | 2017-05-24 | 2018-12-07 | 深圳联品激光技术有限公司 | A kind of ring cavity optical laser system |
| CN109361146A (en) * | 2018-12-24 | 2019-02-19 | 光越科技(深圳)有限公司 | The ultrashort pulse fiber laser seed source system adjusted based on singlechip feedbsck |
| CN109478761A (en) * | 2016-06-03 | 2019-03-15 | Km实验室股份有限公司 | The starting and optimization of laser mode locking are used for using electronic control polarizer |
| CN110631807A (en) * | 2019-09-18 | 2019-12-31 | 中国科学院国家授时中心 | Mode-locked laser state detection device and method based on optical resonant cavity |
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| CN103001106A (en) * | 2012-11-23 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | High power optical fiber laser amplifier capable of achieving stable control of polarization precompensation |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN104242022B (en) * | 2014-09-26 | 2017-08-29 | 天津大学 | Mode-locked laser status real time monitor alarm treatment system |
| CN104538825A (en) * | 2015-01-13 | 2015-04-22 | 上海朗研光电科技有限公司 | Method for detecting stability of mode locking signals in self-starting process of fiber laser |
| CN105449517A (en) * | 2015-12-16 | 2016-03-30 | 中国科学院国家授时中心 | Stabilizing apparatus and stabilizing method for linear polarization laser polarization and power |
| CN109478761A (en) * | 2016-06-03 | 2019-03-15 | Km实验室股份有限公司 | The starting and optimization of laser mode locking are used for using electronic control polarizer |
| CN106451053B (en) * | 2016-08-17 | 2019-01-22 | 北京无线电计量测试研究所 | A kind of detection method and equipment of mode-lock status |
| CN106451053A (en) * | 2016-08-17 | 2017-02-22 | 北京无线电计量测试研究所 | Mode-locked state detection method and device |
| CN108963733A (en) * | 2017-05-24 | 2018-12-07 | 深圳联品激光技术有限公司 | A kind of ring cavity optical laser system |
| CN108963733B (en) * | 2017-05-24 | 2024-09-10 | 深圳联品激光技术有限公司 | Annular cavity fiber laser system |
| CN108539571A (en) * | 2018-04-08 | 2018-09-14 | 上海交通大学 | A kind of fast automatic mode locking method covering multimode pulse recognition |
| CN108539571B (en) * | 2018-04-08 | 2020-05-26 | 上海交通大学 | Rapid automatic mode locking method covering multi-state pulse recognition |
| CN108683066A (en) * | 2018-06-26 | 2018-10-19 | 中国科学技术大学 | A kind of passive mode-locking optical-fiber laser locking device based on array waveguide grating |
| CN108683066B (en) * | 2018-06-26 | 2024-02-20 | 中国科学技术大学 | Passive mode-locking fiber laser locking device based on array waveguide grating |
| CN109361146A (en) * | 2018-12-24 | 2019-02-19 | 光越科技(深圳)有限公司 | The ultrashort pulse fiber laser seed source system adjusted based on singlechip feedbsck |
| CN110631807A (en) * | 2019-09-18 | 2019-12-31 | 中国科学院国家授时中心 | Mode-locked laser state detection device and method based on optical resonant cavity |
| CN110631807B (en) * | 2019-09-18 | 2021-03-02 | 中国科学院国家授时中心 | Mode-locked laser state detection device and method based on optical resonant cavity |
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Application publication date: 20130731 |