CN102005689A - All-fiber structural laser system capable of generating high-energy wave-free split rectangular pulse - Google Patents
All-fiber structural laser system capable of generating high-energy wave-free split rectangular pulse Download PDFInfo
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Abstract
The invention discloses an all-fiber structural laser system capable of generating high-energy wave-free split rectangular pulse, which aims to solve the technical problems that the current erbium-doped fiber laser has low pulse energy and poor stability and is difficult to realize rectangular pulse output. The all-fiber structural laser system comprises two wavelength division multiplexers, an erbium-doped fiber, a first polarization controller, a polarization dependent isolator, a second polarization controller and an output coupler connected in turn through an intra-cavity single mode fiber, wherein the input ends of the two wavelength division multiplexers are provided with pumping light sources. The length of the erbium-doped fiber is 10 to 20 meters, the total length of the single mode fiber is 5 to 10 meters, and the whole intra-cavity net dispersion is kept in a large positive value. The all-fiber structural laser system has the advantages of simple structure, low price, good stability and the like on application; and compared with a solid laser for generating high-energy rectangular pulse, the all-fiber structural laser system has the advantages of high pumping efficiency, adjustment convenience, good pulse quality and the like, and is easy for fiber coupling.
Description
Technical field
The present invention relates to a kind of fiber laser system, be specifically related to a kind of novel all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse that produces.
Background technology
That fiber laser has is simple in structure, with low cost, easy to adjust, stable performance, be convenient to plurality of advantages such as coupling, has obtained deep research in fields such as optical communication, the little manipulation of optics and medical treatment and uses widely.In fiber laser, can realize ultrashort pulse output by mode-locking technique.The locked mode device of comparative maturity mainly comprises deflection nonlinearity technology (Nonlinear polarization rotation technique), semiconductor saturable absorber (semiconductor saturable absorber mirror), carbon nano-tube (carbon nanotube) etc. at present.
By artificial design chamber inner fiber dispersion profile characteristic, mode locked fiber laser can produce conventional femtosecond orphan (Conventional femtosecond Soliton), stretched pulse (Stretched Pulse), similarity pulse (Self-similar Pulse) and dissipative type soliton pulse (Dissipative Soliton) respectively.
Net dispersion is in the fiber laser of negative dispersion in the chamber, because the balanced action of anomalous dispersion and optical fiber Kerr nonlinearity effect in the chamber, this laser is easy to realize mode locking pulse output, but because orphan's quantization of energy effect, single pulse energy is limited in about 0.1nJ, and higher pulse energy will cause the light wave division.The stretched pulse fiber laser is by inserting dispersive delay line, mode locking pulse periodically broadening and compression of quilt in transmission course in the chamber in the chamber.Owing to increased the mean breadth of pulse in the chamber, reduced the light wave division that nonlinear effect causes to a certain extent, pulse energy can reach about 1nJ.Different with traditional femtosecond orphan and stretched pulse, similarity pulse in the chamber in the communication process shape remain unchanged substantially, but spectrum and pulse duration can increase always.Because the restriction of gain live width, single pulse energy is not higher than 10nJ.Studies show that recently, in fiber laser, also can realize mode locking pulse output with very big positive dispersion or Totally positive dispersion.It is generally acknowledged that this orphan's formation is the resultant effect of gain chromatic dispersion, gain saturation and positive dispersion effect, non-linear loss etc., wherein gain and loss have played leading role in orphan's forming process, so be referred to as the dissipative type orphan.Compare with traditional orphan, its pulsewidth has increased two, three orders of magnitude, and nonlinear effect obtains obvious suppression, and light pulse has the extremely strong light wave splitting ability of resisting, and single pulse energy can reach very high level.
Rectangular pulse produces and to obtain in semiconductor laser the earliest, because the particularity of semiconductor laser structure, the rectangular pulse rising edge and the trailing edge time of gained are all long, and hot spot and pulse quality are also bad, serious restriction its application.At present, domestic research to fiber laser mainly concentrates in Gaussian and the parabolic type pulse, realizes that in the erbium-doped fiber laser rectangular pulse output does not also have report.
To sum up, propose a kind of erbium-doped fiber laser that can produce high-energy and do not have the wavefront splitting rectangular pulse and have very big using value and market prospects.
Summary of the invention:
In order to solve the shortcoming that is difficult to realize high-energy rectangular light pulse output in the existing fiber laser, the invention provides a kind of fiber laser system that produces no wavefront splitting high-energy rectangular pulse, it is used widely at aspects such as optical communication, optical sensing, optical detections.
Technical scheme of the present invention is as follows:
A kind ofly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, its special character is: comprise forward direction pump light source 1, first wavelength division multiplexer 2, er-doped gain fibre 3, second wavelength division multiplexer 4, backward pump light source 5, output coupler 6, first Polarization Controller 7, the relevant isolator 8 of polarization and second Polarization Controller 9; Wherein, first wavelength division multiplexer 2, er-doped gain fibre 3, second wavelength division multiplexer 4, output coupler 6, first Polarization Controller 7, the relevant isolator 8 of polarization are connected by monomode fiber 10 closed loops successively with second Polarization Controller 9, described forward direction pump light source 1 is arranged on the input of first wavelength division multiplexer 2, described backward pump light source 5 is arranged on the input of second wavelength division multiplexer 4, and described output coupler 6 is used to export rectangular pulse.
The model of above-mentioned er-doped gain fibre 3 is Nufern EDFC-980-HP, and length is 10～20m, and it has positive dispersion near 1550nm.
The length of above-mentioned Er-doped fiber 3 is 18m.
The wavelength-division scope of above-mentioned first wavelength division multiplexer and second wavelength division multiplexer is 980nm/1550nm; The output ratio of described output coupler is 10～80%.
The output ratio of above-mentioned output coupler 6 is 70%.
Above-mentioned forward direction pump light source 1 and backward pump light source 5 are the single mode semiconductor laser of 980nm for operation wavelength, and its power output is 200-550mW, described single mode semiconductor laser running parameter and Er-doped fiber coupling; Described monomode fiber 10 is the general single mode fiber of 1550nm, and its total length is 5～10m, has negative dispersion near 1550nm.
Above-mentioned forward direction pump light source 1 and backward pump light source 5 power outputs respectively are 500mW; Described monomode fiber 10 length are 7.5m.
Beneficial effect of the present invention is as follows:
1, the used device of fiber ring laser system of the present invention is fiber laser device commonly used, and is simple in structure, with low cost;
2, fiber ring laser system of the present invention adopts all optical fibre structure, conversion efficiency height, good beam quality, good heat dissipation effect, easy and other devices couplings;
3, fiber ring laser system of the present invention can be realized the output of self-starting locked mode, and is simple in structure, is easy to regulate;
4, fiber ring laser system output wavelength of the present invention is with a wide range of applications at aspects such as optical communication, optical ranging, photoelectric sensing field, medical treatment at communication window (1550nm) wave band;
5, the rectangle type pulse of fiber ring laser system generation of the present invention has stable spectral width and high pulse energy and the interior adjustable pulse duration of certain limit, can be used as the picopulse light source and uses;
6, fiber ring laser system of the present invention can be used as the seed source of high energy pulse amplifier.
7, work in clean positive dispersion district, overcome the energy peak restriction of negative dispersion laser, realized that the calm dividing vein of high-energy dashes output;
8, pulse is a rectangle on time domain, be different from the Gaussian of normal pulsed, and pulsewidth is adjustable continuously from 250 to 700ps;
9, pulse stability height, under the constant situation of pumping, can be in next the direct-connected continuous work of same state.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Output spectrum figure when Fig. 2 is fixed on 500mW for forward direction pump light source and backward pump light source;
Fig. 3 is the pulse shape under different polarization (PC) state;
Fig. 4 is the autocorrelator trace figure of output pulse;
Fig. 5 is the spectrogram of output pulse;
Fig. 6 is the graph of a relation of output pulse energy and total pump power;
Affix note explanation: 1-forward direction pump light source; 2-first wavelength division multiplexer; 3-er-doped gain fibre; 4-second wavelength division multiplexer; 5-backward pump light source; The 6-output coupler; 7-first Polarization Controller, the 8-polarization isolator of being correlated with; 9-second Polarization Controller; The 10-monomode fiber.
Embodiment
Referring to Fig. 1, the novel optical fiber Optical Maser System that is used to produce no wavefront splitting high energy pulse provided by the invention comprises: comprise the relevant isolator 8 of forward direction pump light source 1, first wavelength division multiplexer 2, er-doped gain fibre 3, second wavelength division multiplexer 4, backward pump light source 5, output coupler 6, first Polarization Controller 7, polarization, second Polarization Controller 9 that connect by monomode fiber 10 successively.The relevant isolator of polarization links to each other with two Polarization Controllers by monomode fiber, forms equivalent saturable absorber.Forward direction pump light source 1 and backward pump light source 5 are centre wavelength at the 980nm single mode semiconductor laser, and power output 0-500mW is adjustable. Wavelength division multiplexer 2 and 4 wavelength-division scope are 980nm/1550nm.Er-doped fiber 3 models are NufernEDFC-980-HP, and at the abbe number-42ps/nm/km of 1550nm place, length is 18m.Output coupler 6 output ratios are 70%.First Polarization Controller 7, the relevant isolator 8 of polarization, second Polarization Controller 9 are the working standard device.Device tail optical fiber and connection are standard single-mode fiber with optical fiber 10, its total length 7.5m, and its abbe number D is 17ps/nm/km at the 1550nm place.
Operation principle of the present invention and concrete device parameters are as described below:
Referring to figure one, it is that two semiconductor lasers of 980nm are as pump light source that the present invention adopts operation wavelength, each pump light source peak power output is 550mW, the wavelength division multiplexer (WDM) of its logical two 980nm/1550nm carries out forward direction and backward pump pumping to the erbium fibre of one section 18m respectively, the model of this Er-doped fiber is Nufern EDFC-980-HP, and abbe number D is about-42ps/nm/km at the 1550nm place.Suppress the back to feedback by the relevant isolator of polarization, to guarantee the unidirectional running of laser.First Polarization Controller, the relevant isolator acting in conjunction equivalence with polarization of second Polarization Controller are saturable absorber, thereby realize the self-starting locked mode of laser.Wherein the output rating of output coupler is that 70%, 30% energy is stayed ring laser, and this output rating can guarantee that the pulse of output has bigger energy, does not influence the stability of locked mode simultaneously.
The tail optical fiber of wavelength division multiplexer (WDM), the relevant isolator of polarization, output coupler is a common single mode optical fibres, and its total length is 7.5m, and abbe number D is about 17ps/nm/km at the 1550nm place.
The total length of this laser is 25.5m, is 8.2MHz corresponding to the fundamental frequency in chamber, and wherein the length of erbium fibre is 18m, the net dispersion β in the chamber
2For+0.8ps
2
Adopt spectroanalysis instrument (YOKOGAWA-6370B) to measure the spectrum of output pulse in the test, sharp oscilloscope is measured the width of pulse.Utilize autocorrelation function analyzer and frequency spectrograph to confirm that the gained rectangular pulse is pulse.Adopt shape design of this structure chamber, the length by rationally selecting the erbium fibre and the length of single mode are come the size of net dispersion in the control chamber.Under big positive dispersion condition,, just can obtain high-octane rectangular pulse by regulating Polarization Controller.
The part of testing used annular optical fiber laser all uses the device of traditional fiber laser, has the advantage that simple in structure, cheap, good stability etc. is used.It can export the high-energy rectangular pulse, and the width of pulse can be controlled within the specific limits.Compare with the solid state laser that produces the high-energy rectangular pulse, it have the pumping efficiency height, easy to adjust, be easy to advantage such as optical fiber coupling.
The basic physical process that this laser works principle and mode locking pulse form is: this Optical Maser System utilizes nonlinear polarization rotation (NPR:Nonlinear Polarization Rotation) technology to realize the self-starting locked mode; When pump power reaches certain threshold value, regulate the linear phase shift in first and second Polarization Controller control chamber, just can obtain stable mode locking pulse output.The basic physical process of its pulse shaping is: the initial noise pulse in the laserresonator repeatedly passes through Er-doped fiber in the chamber after, obtain gain and amplify; Since strong from phase modulated (Self-phase Modulation, SPM) etc. nonlinear effect causes the broadening of its spectrum, produces positive frequency chirp, the positive dispersion of while Er-doped fiber also causes pulse broadening thereupon on time domain; The acting in conjunction equivalence saturable absorber of the relevant isolator of two Polarization Controllers and polarization, its effect is to eliminate the segment pulse both wings, reduce pulsewidth, eliminate simultaneously in the both wings because red shift and blue shift composition that positive dispersion brings make pulse be able to filtering at frequency domain; Suppress the back of light wave in the chamber by the relevant isolator of polarization, to guarantee the unidirectional running of annular cavity laser to feedback; This process moves in circles, and can form in the chamber from being in harmony evolution until the pulse of initial input light wave, finally obtains stable mode locking pulse, and whole system reaches dynamic equilibrium and exports by the output coupler coupling.So the generation of this rectangular pulse is fiber laser gain, nonlinear polarization rotation and the coefficient result of effect such as non-linear loss, and gain and loss have played important function in the pulse shaping process.
In the experiment, adopt spectroanalysis instrument (ANDO AQ-6370B) to measure the spectrum of output rectangular pulse, (LeCroy SDA 11GHz) observes pulse train, confirms that with autocorrelation function analyzer and frequency spectrograph the gained pulse is a pulse with oscilloscope.
Experimental result of the present invention is as follows: this laser realizes that the threshold power of self-starting locked mode is about 80mW for the front and back pump, still can keep unglazed wavefront splitting pulse output when forward direction and backward pump power all increase to 550mW; Output spectrum under the 500-500mW pump power as shown in Figure 2, its gaussian-shape that is as the criterion, centre wavelength is about 1567nm, the spectrum full width at half maximum is about 14nm.Pump power is at 500-500mW, under different PC states, in the pulse shape that records with the high-frequency digital sampling oscilloscope as shown in Figure 3 before and after fixing.The width that can see pulse is adjustable continuously between 250 to 700ps.The autocorrelator trace of pulse as shown in Figure 4, it is perfect triangle, has verified that the gained rectangular pulse is pulse rather than noise like pulse.Output the pulse frequency spectrogram as shown in Figure 5, the pulse repetition frequency that records is 8.19MHz, corresponding to the fundamental frequency in chamber, is that signal to noise ratio is about 70dB under the 150Hz in bandwidth resolution.We be sure of that the gained pulse is the rectangle pulse that is operated in fundamental frequency by the autocorrelator trace of pulse and spectrogram.Fig. 6 shows be the energy of pulse with the relation between the total pump power, can see that the energy of pulse increases with the pump power substantially linear, the maximum impulse energy can reach 45nJ.
By the length and the chromatic dispersion of rationally selecting Er-doped fiber and monomode fiber for use, the net dispersion in the whole chamber to remain bigger on the occasion of.
Claims (7)
1. one kind can produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: comprise forward direction pump light source (1), first wavelength division multiplexer (2), er-doped gain fibre (3), second wavelength division multiplexer (4), backward pump light source (5), output coupler (6), first Polarization Controller (7), the relevant isolator (8) of polarization and second Polarization Controller (9); Wherein, first wavelength division multiplexer (2), er-doped gain fibre (3), second wavelength division multiplexer (4), output coupler (6), first Polarization Controller (7), the relevant isolator (8) of polarization are connected by monomode fiber (10) closed loop successively with second Polarization Controller (9), described forward direction pump light source (1) is arranged on the input of first wavelength division multiplexer (2), described backward pump light source (5) is arranged on the input of second wavelength division multiplexer (4), and described output coupler (6) is used to export rectangular pulse.
2. according to claim 1ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: the model of described er-doped gain fibre (3) is Nufern EDFC-980-HP, length is 10～20m, and it has positive dispersion near 1550nm.
3. according to claim 2ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: the length of described Er-doped fiber (3) is 18m.
4. according to claim 1ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: the wavelength-division scope of described first wavelength division multiplexer and second wavelength division multiplexer is 980nm/1550nm; The output ratio of described output coupler is 10～80%.
5. according to claim 4ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: the output ratio of described output coupler (6) is 70%.
6. according to claim 1ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: described forward direction pump light source (1) and backward pump light source (5) are the single mode semiconductor laser of 980nm for operation wavelength, its power output is 200-550mW, described single mode semiconductor laser running parameter and Er-doped fiber coupling; Described monomode fiber 10 is the general single mode fiber of 1550nm, and its total length is 5～10m, has negative dispersion near 1550nm.
7. according to claim 6ly produce the all-fiber structure laser system that high-energy does not have the wavefront splitting rectangular pulse, it is characterized in that: described forward direction pump light source (1) and backward pump light source (5) power output respectively are 500mW; Described monomode fiber (10) length is 7.5m.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102323212A (en) * | 2011-08-11 | 2012-01-18 | 电子科技大学 | Micro-nano optical fiber mode-locked laser sensor and manufacturing method thereof |
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered laser |
| CN105826800A (en) * | 2016-04-21 | 2016-08-03 | 宁波大学 | All-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source |
| CN106711748A (en) * | 2016-12-23 | 2017-05-24 | 电子科技大学 | All-fiber structure high-energy rectangular laser pulse generation system and method |
| CN108831850A (en) * | 2018-06-26 | 2018-11-16 | 潍坊华光光电子有限公司 | A kind of binary fission method of semiconductor laser solution bar item |
| CN108847570A (en) * | 2018-08-06 | 2018-11-20 | 佛山科学技术学院 | It is a kind of for generating the device of Q-switch and mode-locking noise like square-wave pulse |
| 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 |
| CN109273972A (en) * | 2018-10-25 | 2019-01-25 | 中国科学院西安光学精密机械研究所 | A kind of all -fiber femto-second laser |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN109687269A (en) * | 2019-01-24 | 2019-04-26 | 中国科学院西安光学精密机械研究所 | A kind of 1.7 based on thulium-doped silica fib μm mode locked fiber laser |
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| CN102323212A (en) * | 2011-08-11 | 2012-01-18 | 电子科技大学 | Micro-nano optical fiber mode-locked laser sensor and manufacturing method thereof |
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered laser |
| CN105826800A (en) * | 2016-04-21 | 2016-08-03 | 宁波大学 | All-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source |
| CN106711748A (en) * | 2016-12-23 | 2017-05-24 | 电子科技大学 | All-fiber structure high-energy rectangular laser pulse generation system and method |
| 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 |
| CN108831850A (en) * | 2018-06-26 | 2018-11-16 | 潍坊华光光电子有限公司 | A kind of binary fission method of semiconductor laser solution bar item |
| CN108831850B (en) * | 2018-06-26 | 2020-11-27 | 潍坊华光光电子有限公司 | Binary splitting method of splitting bar for semiconductor laser |
| CN108847570A (en) * | 2018-08-06 | 2018-11-20 | 佛山科学技术学院 | It is a kind of for generating the device of Q-switch and mode-locking noise like square-wave pulse |
| CN109273972A (en) * | 2018-10-25 | 2019-01-25 | 中国科学院西安光学精密机械研究所 | A kind of all -fiber femto-second laser |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN109687269A (en) * | 2019-01-24 | 2019-04-26 | 中国科学院西安光学精密机械研究所 | A kind of 1.7 based on thulium-doped silica fib μm mode locked fiber laser |
| CN109687269B (en) * | 2019-01-24 | 2020-07-31 | 中国科学院西安光学精密机械研究所 | 1.7 mu m mode-locked fiber laser based on thulium-doped quartz fiber |
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Open date: 20110406 |