CN102025095A - Novel optical fiber laser system for generating high-energy pulse - Google Patents
Novel optical fiber laser system for generating high-energy pulse Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 230000010287 polarization Effects 0.000 claims abstract description 26
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 11
- 238000005086 pumping Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 229910052691 Erbium Inorganic materials 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
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- 230000008569 process Effects 0.000 description 3
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004038 photonic crystal Substances 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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Abstract
The novel optical fiber laser system for generating high-energy pulses comprises a wavelength division multiplexer 2, an output coupler 4, a first polarization controller 5, a polarization-related isolator 6 and a second polarization controller 7 which are connected in sequence through an optical path; the input end of the wavelength division multiplexer is provided with a pumping light source 1, and an erbium doped optical fiber 3 is arranged between the output end of the wavelength division multiplexer and the input end of the output coupler; the length of the erbium-doped fiber is 5-30 m. The invention can solve the technical problem of limited output energy caused by the optical wave splitting effect of the existing optical fiber laser. The device used by the optical fiber system is a common device in a common optical fiber laser, the structure is very simple, and the cost is low; compared with the traditional solid laser, the laser adopts an all-fiber structure, and has the advantages of high conversion efficiency, good beam quality, convenient heat dissipation, easy coupling with other fiber devices and the like.
Description
Technical field:
The present invention relates to a kind of fiber laser system, be specifically related to a kind of novel optical fiber laser system that produces high energy pulse.
Background technology:
Fiber laser has obtained extensive studies and development because it is simple in structure, with low cost and regulate easy and advantage such as have good stability.According to the dispersion profile characteristic of fiber laser, the optical fiber mode-locked laser can excite respectively and produce conventional negative dispersion soliton pulse (conventional soliton), stretched pulse (stretched pulse), similarity pulse (self-similar pulse) and dissipative type soliton pulse (dissipative soliton).
In negative dispersion Soliton fiber laser, work in the laser with active-passive lock mould of its dispersion region, because the balance of anomalous dispersion and optical fiber Kerr nonlinearity in the chamber, this laser is easy to realize stable orphan's locked mode output, but the quantization effect limits of traditional soliton pulse the ceiling capacity that may export of this class laser.Because be subjected to the restriction of orphan's area theory, the energy of soliton pulse is limited in about 0.1nJ, when optical pulse energy is higher, will cause the light wave division.Though the stretched pulse mode-locked laser is by inserting dispersive delay line in the chamber, make experience broadening and the compression of mode locking pulse at the chamber intercycle, reduced the peak power of pulse in the chamber, overcome the wavefront splitting that nonlinear effect causes in orphan's mode-locked laser, the comparable conventional negative dispersion orphan of pulse energy of output improves an order of magnitude, but its pulse energy still can't reach higher level.
It on the similarity pulse mathematics non-linear Schrodinger equation (Nonlinear Schrodinger Equation) that has gain self-similar solution in optical fiber positive dispersion district.When similarity pulse was propagated at high power, pulse shape did not change, and had the ability of resisting the light wave division.The similarity pulse fiber laser needs the negative dispersion element to realize that pulse is in harmony evolution certainly in the chamber, and its cavity total dispersion values maintains little greater than 0 level.The chamber internal dispersion of stretched pulse and similarity pulse laser distributes and can simplify as shown in Figure 1.As shown in Figure 1a, total dispersion β in the stretched pulse laser chamber
NetBe approximately 0; And in the similarity pulse laser, shown in Fig. 1 b, the β in the chamber
NetBe slightly larger than 0.
For obtaining more high-octane pulse, can also be by in the chamber, adopting particular device, as photonic crystal fiber methods such as (PCF), its principle is the bigger characteristics of mode field area by utilizing photonic crystal fiber, thereby reduce optical pulse energy density, prevent the pulse division.The method need connect with space optics because the PCF core diameter much larger than general single mode fiber, can't be directly be coupled with the monomode fiber device, causes cavity structure complexity, adjusting loaded down with trivial details, and cost is higher.For overcoming these shortcomings, need to propose new pulse and produce theory and method.And along with going deep into of studying, optical soliton also can form in the fiber laser of being made up of whole positive dispersions (all-normal-dispersion) or clean positive dispersion (net-normal-dispersion).The dissipative type pulse that produces in the positive dispersion fiber laser can be by Ginzburg-Landau equation approximate description.Because the light pulse that forms in this class laser is coefficient results such as laser gain chromatic dispersion, gain saturation and positive dispersion effect, non-linear loss, formed light pulse be otherwise known as dissipative type light pulse or dissipative type optical soliton.Dissipative type pulse laser chamber internal dispersion distributes shown in Fig. 1 c, by the positive dispersion amount in the further increase chamber, and remove the negative dispersion device, can obtain the pulse output that pulsewidth is wideer, warble bigger, accordingly, pulse energy also can be further enhanced.The research that the pulse of ytterbium (Yb) fiber laser generation dissipative type is mixed based on positive dispersion by recent U.S. Cornell University one research group has obtained many achievements.Its output pulse spectrum has precipitous edge, and has very big just warbling.This type of pulse can be gathered more energy output, and after overcompression, peak power can reach kW even MW magnitude.The result that present this type laser is produced does not have the mature theory analysis in the world as yet, and the experiment achievement is also improving day by day and improving.But the work that this research group does mainly is confined to mix ytterbium (Yb) fiber laser, and to being applied to communication band, the wide less research of er-doped (Er) fiber laser of development prospect.Domestic research for high-capacity optical fiber laser, major part also all are confined to ytterbium-doping optical fiber laser.
Summary of the invention:
In order to solve the technical problem of output energy constraint due to the light wave division effect that exists in the existing fiber laser, the invention provides a kind of novel optical fiber laser system that produces high energy pulse.
Technical scheme of the present invention is as follows:
The novel optical fiber laser system of generation high energy pulse provided by the invention, this system comprise the relevant isolator of wavelength division multiplexer, output coupler, first Polarization Controller, polarization and second Polarization Controller that connects by light path successively; The input of described wavelength division multiplexer is provided with pump light source, it is characterized in that: be provided with er-doped (Er) optical fiber between the output of described wavelength division multiplexer and the input of output coupler; The length of described Er-doped fiber is 5-30m.
The length of above-mentioned Er-doped fiber is 20m.
The frequency division scope of above-mentioned wavelength division multiplexer is 980nm/1550nm.
The output ratio of above-mentioned output coupler is 10%.
Above-mentioned pumping light source output power is 200-500mW.
Above-mentioned pumping light source output power is 500mW.
Above-mentioned pump light source is that operation wavelength is the single mode semiconductor laser of 980nm.
The model that above-mentioned Er-doped fiber adopted is Nufern EDFC-980-HP.
Description of drawings:
Fig. 1 is the chamber internal dispersion distribution map of stretched pulse, similarity pulse and dissipative type pulse laser;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is dissipative type pulse of the present invention spectrogram when pump power is 500mW;
Fig. 4 records the dissipative type pulse sequence diagram for oscilloscope of the present invention;
Fig. 5 pulse autocorrelator trace of the present invention figure.
The explanation of affix note:
The 1-pump light source; The 2-wavelength division multiplexer; 3-er-doped (Er) optical fiber; The 4-output coupler; 5-first Polarization Controller; The 6-polarization isolator of being correlated with; 7-second Polarization Controller.
Beneficial effect of the present invention is as follows:
1. the used device of this fibre system is commonplace components commonly used in the ordinary optic fibre laser instrument, and its structure is very simple, and cost is also comparatively cheap.
2. compare with traditional solid state laser, this laser instrument adopts all optical fibre structure, has the conversion efficiency height, good beam quality, and heat radiation is convenient, easily and the advantage such as other device couplings.
3. this laser instrument is easy to regulate, and is easy and simple to handle.
4. the erbium doped fiber laser of this invention made, because of its wavelength just at communication window (1550nm) wave band, therefore be with a wide range of applications at aspects such as optical communication, optical ranging, photoelectric sensing field, medical treatment. And the Gaussian-shaped pulse that produces has great spectral width and higher pulse energy. Can also use as the wideband pulse light source. After through negative dispersion device compression pulse width, can also use as high-energy femtosecond pulse source.
5. high energy pulse is directly exported in the chamber, need not to amplify again. And owing to limit by experiment condition, the pumping source power level is lower, and peak power is 500mW only, causes pulse energy that further increase is not yet arranged. If the increasing pump power can obtain more high-octane pulse.
Embodiment:
Referring to Fig. 2, the novel optical fiber laser system of generation high energy pulse provided by the invention comprises the relevant isolator 6 of pump light source 1, wavelength division multiplexer 2, output coupler 4, first Polarization Controller 5, polarization and second Polarization Controller 7 that connects by light path successively; Be provided with er-doped (Er) optical fiber 3 between wavelength division multiplexer 2 and the output coupler 4.The length of Er-doped fiber 3 is 5-30m, and it selects the 20m best results for use.Pump light source 1 selection work wavelength is the single mode semiconductor laser of 980nm, and time output pulse spectrum envelope has covered the 1530nm-1660nm scope for 500mW when power output.The frequency division scope of wavelength division multiplexer 2 is 980nm/1550nm; The output ratio of output coupler 4 is 10%.The model of Er-doped fiber 3 is Nufern EDFC-980-HP.
Operation principle and concrete device parameters are as follows:
Referring to Fig. 2, it is that the single mode semiconductor laser of 980nm is as pump light source that the present invention adopts operation wavelength, its peak power output is 500mW, wavelength division multiplexer (WDM) by 980nm/1550nm is that the Er-doped fiber of 20m carries out pumping to a segment length again, the model of this Er-doped fiber is Nufern EDFC-980-HP, and dispersion parameters D is-42ps/nm/km at the 1550nm place.Suppress the back to feedback by the relevant isolator of polarization, guaranteeing the unidirectional running of annular cavity laser, and form equivalent saturable absorber with first Polarization Controller and the second Polarization Controller acting in conjunction, thus realization self-starting locked mode.Wherein output coupler is 10% output, and 90% stays in the chamber.This output ratio is comparatively reasonable, and other ratios can cause pumping threshold to raise.
Other optical fiber are that total length is the standard single-mode fiber of 3.8m in the chambeies such as device tail optical fiber, and its dispersion parameters D is 17ps/nm/km at the 1550nm place.
The total chamber of this laser is long to be 23.8m, so its locked mode fundamental frequency is about 8.72MHz, because the Er-doped fiber length that adopts reaches 20m, the cavity total dispersion measure reaches+1 ps
2
Adopt spectroanalysis instrument (ANDO AQ-6315A) can measure the spectrum of output laser in the experiment, again through (LeCroy SDA 11GHz) observes pulse train, measures pulse duration with autocorrelation function analyzer with oscilloscope after the opto-electronic conversion.Adopt this chamber type project organization, by reasonably choosing Er-doped fiber length, thereby carry out dispersion values control and strengthen nonlinear effect, Er-doped fiber length is long more, and dispersion values is big more, and nonlinear effect is strong more.Have under the great positive dispersion condition in laser cavity, carefully regulate laser, just can produce this novel high-energy pulse.
Concrete principle of the present invention and interpretation are as follows:
This laser utilizes nonlinear polarization rotation (NPR:Nonlinear Polarization Rotation) technology to realize the self-starting locked mode.When pump power surpasses certain threshold value,, can obtain stable mode locking pulse output by regulating the polarization state of first Polarization Controller and second Polarization Controller.In experiment, this laser can realize that the minimum pump power of self-starting locked mode only is 45mW, yet, when this state increases pump power down, will form multiple-pulse output, therefore can't obtain the output of high-energy pulse.Keep pumping source power more than 200mW, continue to adjust Polarization Controller, under specific state, increase pump power to maximum and number of pulses remains one, can obtain high-energy this moment does not have wavefront splitting dissipative type pulse output.The typical output spectrum and the pulse train of such pulse, See Figure 3 and shown in Figure 4 respectively.At the experimental result among Fig. 3-Fig. 4, its basic physical process that forms mode locking pulse is: the initial noise pulse in the laser cavity after entering to Er-doped fiber by the pumping amplification that gained, because strong causes the broadening of its spectrum from phase modulated nonlinear effects such as (SPM:self-phase modulation), and produces positive frequency chirp.Because Er-doped fiber has great positive dispersion, the width that causes pulse is broadening thereupon also.After this enter into the relevant formed equivalent saturable absorber of isolator of Polarization Controller and polarization, the both wings of pulse partly are eliminated, and cause pulsewidth to reduce.Meanwhile, because pulse has positive frequency and warbles, pulse front edge is partly for the long wave composition of red shift, the edge, back is the shortwave composition of blue shift, under greatly positive dispersion influences, the forward position of pulse (long wave) propagation velocity height is then slow along the propagation velocity of (shortwave), the pulse both wings are eliminated in saturable absorber and have caused the filtering of pulse at frequency domain simultaneously, the spectral width that is pulse is reduced. and this process moves in circles, in the chamber, can form from being in harmony evolution until the pulse of initial input light wave, finally can obtain stable mode locking pulse output.This shows that formed pulse is coefficient results such as laser gain, nonlinear polarization rotation and non-linear loss, the dissipative type pulse therefore is otherwise known as.Since from warbling of introducing of nonlinear effects such as phase modulated for just, simultaneously the chamber internal dispersion be bigger on the occasion of, both actings in conjunction cause the pulsewidth of dissipative type pulse also bigger, two have been increased more than the order of magnitude than general negative dispersion orphan, therefore the pulse peak power in the chamber will maintain lower level, thereby can effectively avoid light wave division effect, the output pulse energy also can improve one, two order of magnitude; And the dispersion values of laser is big more, and can obtain the pulse ceiling capacity also will be high more.
Referring to Fig. 3, when pump power was 500mW, output pulse spectrum envelope had covered the 1530nm-1660nm scope, has comprised C-band (1530-1565nm), L-band (1565-1625nm) and the U wave band (1625-1675nm) of communication band; Its 3dB spectral width can reach 42nm.
The calm dividing vein of the type high-energy dashes and compares with other conventional dissipation orphans, salient feature is arranged: at first, its spectral width is very big, has contained the C+L+U wave band, far surpassed the gain bandwidth of testing used Er-doped fiber, used gain fibre is the C-band Er-doped fiber in the experiment.This is owing to used Er-doped fiber length in the experiment is bigger, pulse can fully be amplified in gain fibre, and by the gain characteristics of Er-doped fiber as can be known, the spectrum of output pulse even can exceed the gain bandwidth scope of Er-doped fiber with strong broadening under the high pumping power situation.Secondly, spectral envelope is comparatively slick and sly, and without any sideband or precipitous edge, this is different with common dissipative type soliton pulse exemplary spectrum shape (having limited gain bandwidth and precipitous edge).
It should be noted that; though the spectral width of the type pulse is very big and energy is higher; (noise-like solitons) is similar with the noise like pulse that produces in the conventional negative dispersion soliton laser; but because both just are being operated in respectively/dispersion region; locked mode mechanism is different fully, so both have the difference of internal in the physical sense.This point also can be verified from Fig. 5: the noise like pulse auto-correlation spectral line that the negative dispersion laser forms generally has extremely narrow spine center of width and the great base of width; The auto-correlation spectral line that high-energy does not have the pulse of wavefront splitting dissipative type then is slick and sly Gaussian.In conjunction with the physical features of pulse and the theory analysis of laser locked mode process, can learn that the pulse that this laser produced is different and the novel pulse of other any fiber lasers in the past.
As shown in Figure 5, when being 500mw corresponding to pump power, pulse autocorrelator trace full width at half maximum is 137ps; Consider that pulse is a Gaussian, then corresponding pulse duration is respectively 97ps.Along with the increase of pump power, the intensity of pulse increases thereupon, and pulse duration also increases gradually.Because the output coupler of this laser is positioned at light wave just by after the Er-doped fiber, be pulse duration maximum in the chamber, the pulse of output also has greatly just warbles. when pump power is 500mW, pulse this moment 3dB spectral width is 42nm, centre wavelength is got 1590nm, pulsewidth is 97ps, can get its time bandwidth product (TBP) thus and be about 483.The outer average pulse power of output cavity this moment is about 30mW; By the single pulse energy computing formula
(P
AvgThe average power of indicating impulse, F is pulse repetition frequency 8.72MHz, T represents standard time unit), learn that through calculating the single pulse energy of output is about 3.44nJ outside the chamber.Because the output coupler output rating that adopts in the experiment is 10%, therefore as can be known, the pulse gross energy of the type high energy pulse is about 34.4nJ.
Behind above-mentioned experiment and theory analysis, this type laser can overcome the suffered energy peak restriction of negative dispersion laser, shows the diverse characteristic with the traditional optical orphan, thereby realizes that the calm dividing vein of high-energy dashes output.The erbium doped fiber laser of this invention made, because of its wavelength just at communication window (1550nm) wave band, therefore be with a wide range of applications at aspects such as optical communication, optical ranging, photoelectric sensing field, medical treatment.And the Gaussian-shaped pulse that is produced has great spectral width and higher pulse energy.After through negative dispersion device compression pulse width, can also use as high-energy femtosecond pulse source.
Claims (8)
1. novel optical fiber laser system that produces high energy pulse, this system comprise the relevant isolator of wavelength division multiplexer, output coupler, first Polarization Controller, polarization and second Polarization Controller that connects by light path successively; The input of described wavelength division multiplexer is provided with pump light source, it is characterized in that: be provided with er-doped (Er) optical fiber between the output of described wavelength division multiplexer and the input of output coupler; The length of described Er-doped fiber is 5-30m.
2. the novel optical fiber laser system of generation high energy pulse according to claim 1 is characterized in that: the length of described Er-doped fiber is 20m.
3. the novel optical fiber laser system of generation high energy pulse according to claim 1 and 2 is characterized in that: the model of described wavelength division multiplexer is 980nm/1550nm.
4. the novel optical fiber laser system of generation high energy pulse according to claim 3 is characterized in that: the output ratio of described output coupler is 10%.
5. the novel optical fiber laser system of generation high energy pulse according to claim 4 is characterized in that: described pump light source power output is 200-500mW.
6. the novel optical fiber laser system of generation high energy pulse according to claim 5 is characterized in that: described pump light source power output is 500mW.
7. the novel optical fiber laser system of generation high energy pulse according to claim 6 is characterized in that: described pump light source is that operation wavelength is the single mode semiconductor laser of 980nm.
8. the novel optical fiber laser system of generation high energy pulse according to claim 7 is characterized in that: the model that described Er-doped fiber adopted is Nufern EDFC-980-HP.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184034A (en) * | 2014-09-19 | 2014-12-03 | 深圳市杰普特电子技术有限公司 | Laser output device and method |
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered 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 |
| CN108879300A (en) * | 2018-06-04 | 2018-11-23 | 华南师范大学 | Super continuum source system and method based on the pumping of double bound state mode locking pulses |
-
2009
- 2009-09-16 CN CN2009100239327A patent/CN102025095A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered laser |
| CN104184034A (en) * | 2014-09-19 | 2014-12-03 | 深圳市杰普特电子技术有限公司 | Laser output device and method |
| CN108879300A (en) * | 2018-06-04 | 2018-11-23 | 华南师范大学 | Super continuum source system and method based on the pumping of double bound state mode locking pulses |
| CN108879300B (en) * | 2018-06-04 | 2024-04-05 | 华南师范大学 | Supercontinuum light source system and method based on double-constraint mode-locked pulse pumping |
| 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 |
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Application publication date: 20110420 |