CN105244754A - Spectrum synthesis method and device based on random fiber laser - Google Patents
Spectrum synthesis method and device based on random fiber laser Download PDFInfo
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- CN105244754A CN105244754A CN201510813011.6A CN201510813011A CN105244754A CN 105244754 A CN105244754 A CN 105244754A CN 201510813011 A CN201510813011 A CN 201510813011A CN 105244754 A CN105244754 A CN 105244754A
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Abstract
The invention provides a spectrum synthesis method and a device based on a random fiber laser. The method comprises the following steps: the random fiber laser serves as a seed light source for spectrum synthesis, and a synthetic laser is obtained; and the random fiber laser is generated by a random laser seed. According to the method provided by the invention, the random fiber laser is used for spectrum synthesis, limitation on spectrum synthesis caused by spectrum broadening generated when the traditional laser is subjected to power amplification in the fiber is broken, the power level of the existing spectrum synthesis scheme is enhanced, and the technological requirements on the spectrum synthesis device are reduced.
Description
Technical field
The present invention relates to laser technology field, be specifically related to a kind of Spectral beam combining method based on random optical-fiber laser and device thereof.
Background technology
Spectral beam combining is after a branch of for the Laser synthesizing of different wave length, then launches, and after being merged by the laser of different wave length, while lifting beam output power, also improves the brightness of light beam entirety.Therefore, Spectral beam combining, as the method for improving laser light beam gross output, receives much concern in recent years.Compared with optics coherence tomography, the structure of Spectral beam combining device is simpler.Spectral beam combining only has requirement to the spectral characteristic of single laser.And to synthesizing the coherence of laser used without strict demand, this makes synthesis be easier to control.
Current Spectral beam combining method mainly contains two classes, and a class carries out Spectral beam combining based on grating (Volume Bragg grating or electrolyte grating); Another kind of is carry out Spectral beam combining based on dichroic mirror.These two kinds of synthetic methods require relatively high to the spectrum width of single channel light source.For dielectric grating spectrum synthetic method, under prior art conditions, optical grating diffraction equation is met in order to make incident laser, be unlikely to beam quality is degenerated simultaneously, strictly must control (to be published in OpticsLetters see C.Wirth, O.Schmidt, I.Tsybin etc. to the width of laser spectroscopy, " the Highaveragepowerspectralbeamcombiningoffourfiberamplifie rsto8.2kW. " of 2011,36 (16): 3118-3120).And for Volume Bragg grating, also for ease of the combined coefficient that guarantee is higher, the wave-length coverage of laser strictly must meet Bragg condition.When adopting dichroic mirror to carry out Spectral beam combining, although from synthesis angle, equipment therefor is not strict with spectral width, but the Transmittance spectrum of existing synthesizer is limited, wider spectral line will inevitably cause after dichroic mirror can the minimizing of synthetic laser way, and then limits the lifting to laser power after Spectral beam combining.Such as, the typical output spectra full width at half maximum of 3 kilowatts of fiber amplifiers is 3.9 nanometers, and spectral width corresponding to 95% energy laser is about 6 nanometers, suppose dichroic mirror to reach 100 nanometers through spectrum wide, then Spectral beam combining device is maximum can synthetic laser way be 16 tunnels.(see H.Yu, H.Zhang, H.Lv, X etc. are published in AppliedOptics, " 3.15kWdirectdiode-pumpedneardiffraction-limitedall-fiber-integratedfiberlaser " of 2015,54 (14): 4556-4560) after Spectral beam combining the loss of laser way more.
Under low power conditions, the output spectra line width of single-path optical fiber amplifier system can be controlled by the spectral characteristic adjusting seed laser.But in a fiber, due to the impact of the nonlinear effects such as Self-phase modulation, Cross-phase Modulation, four wave mixing, spectrum continuous broadening of meeting in amplification process of conventional laser, particularly when laser power is higher, spectrum widening is comparatively obvious.Thus limit the power of the single laser that may be used for Spectral beam combining.
Summary of the invention
The object of the present invention is to provide a kind of Spectral beam combining method based on random optical-fiber laser and device thereof, this invention solves because spectrum widening makes the power of gained laser to be greatly improved in prior art, thus the technical problem of restriction Spectral beam combining power ascension.
An aspect of of the present present invention additionally provides a kind of Spectral beam combining method based on random optical-fiber laser, comprises the following steps: carry out Spectral beam combining using random optical-fiber laser as seed light source, obtain synthetic laser; Random optical-fiber laser is produced by Random Laser seed source.
Further, also comprise the step of random optical-fiber laser being carried out to power amplification, when random optical-fiber laser wavelength is 1040nm ~ 1120nm, amplification procedure carries out mixing in ytterbium gain fibre; When random optical-fiber laser wavelength is 1900 ~ 2100nm, amplification procedure carries out mixing holmium or mix in thulium gain fibre.
The present invention additionally provides a kind of Spectral beam combining device based on random optical-fiber laser based on said method on the other hand, comprise: for generation of the Random Laser seed source of random optical-fiber laser, for carrying out the power amplifier device of power amplification and the Spectral beam combining device for carrying out Spectral beam combining to random optical-fiber laser to random optical-fiber laser, the random optical-fiber laser of the light-emitting window outgoing of Random Laser seed source sequentially can pass through power amplification link and Spectral beam combining device, Random Laser seed source, between power amplification link and Spectral beam combining device be light connect.
Further, Random Laser seed source comprises pumping source, backward smooth spacer assembly and the passive optical fiber that sequentially light connects, and pumping source is for generation of laser, and passive optical fiber is used for providing Raman gain and random Rayleigh feedback.
Further, backward smooth spacer assembly is Fiber Bragg Grating FBG or wavelength division multiplexer.
Further, when backward smooth spacer assembly is wavelength division multiplexer, the signal arm containing light connection with it on wavelength division multiplexer, signal arm is used for the random optical-fiber laser of export section with the Spectral beam combining device stability of monitoring based on random optical-fiber laser.
Further, the transmitting device for making random optical-fiber laser one-way transmission is also provided with between power amplifier device and Random Laser seed source.
Further, also comprise filter, random optical-fiber laser enters power amplifier device after device after filtering, and the transmitance of filter is greater than 99%.
Further, the light isolation strength of transmitting device is greater than 30dB.
Further, transmitting device is the optical circulator comprising at least 3 optical transport ends, the exit end of Random Laser seed source is connected with the first optical transport end light of optical circulator, second optical transport end of optical circulator is connected with filter light, and the 3rd optical transport end of optical circulator is connected with power amplifier device light; Filter is reflection-type.
Technique effect of the present invention:
Spectral beam combining method based on random optical-fiber laser provided by the invention adopts random optical-fiber laser to carry out Spectral beam combining, and the spectrum widening effect of random optical-fiber laser is more weak, makes it that original spectrum form can be kept in a fiber to carry out power amplification.Make use of the above-mentioned characteristic of random optical-fiber laser, avoid the generation of spectrum widening in light amplification process, thus achieve the effective raising of Spectral beam combining to laser power.
Spectral beam combining device basic composition based on random optical-fiber laser provided by the invention comprises: random optical-fiber laser seed source, power amplification link and Spectral beam combining parts.This device and conventional laser structure compared are simple, eliminate fiber grating, due to spectrum not broadening also reduce the technological requirement to synthesizer.Reduce production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the preferred embodiment of the present invention based on the Spectral beam combining device of random optical-fiber laser;
Fig. 2 is Random Laser seed source structural representation in one embodiment of the present invention;
Fig. 3 is Random Laser seed source structural representation in another preferred embodiment of the present invention;
Fig. 4 is Random Laser seed source structural representation in another preferred embodiment of the present invention;
Fig. 5 is Random Laser seed source structural representation in another preferred embodiment of the present invention;
Fig. 6 is the present invention's preferably structural representation of being connected with transmitting device of an embodiment median filter;
Fig. 7 is the structural representation that the present invention's another embodiment median filter preferred is connected with transmitting device;
Fig. 8 is the spectral results schematic diagram of the Random Laser power amplification obtained based on the Spectral beam combining device of random optical-fiber laser provided by the invention.
Embodiment
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
The invention provides the Spectral beam combining method based on random optical-fiber laser, comprise the following steps: carry out Spectral beam combining using random optical-fiber laser as seed light source, obtain synthetic laser; Random optical-fiber laser is produced by Random Laser seed source.
It is there is not longitudinal mode that the laser that inventor chances on random optical-fiber laser used has, and output time-domain is stablized, the characteristic that spectrum widening effect is more weak; The exemplary value of the spectrum full width at half maximum of random optical-fiber laser is 1-3nm, different because of power level, and these characteristics can meet the requirement of most of Spectral beam combining; If desired narrower spectrum also can add filter in laser, controls spectral width.The method can complete Spectral beam combining by any existing Spectral beam combining device.It is the synthesis of achievable multiple laser in the multiple laser incident light spectrum synthesizer of different wave length.Spectral beam combining herein can carry out synthesis by existing Spectral beam combining device to the laser of more incident and obtain.As shown in Figure 1, Spectral beam combining device 9 receives from different random laser seed source 101,102 ... the multiple laser of n, synthesizes it.
Preferably, also comprise the step of random optical-fiber laser being carried out to power amplification, when random optical-fiber laser wavelength is 1040nm ~ 1120nm, amplification procedure carries out mixing in ytterbium gain fibre; When random optical-fiber laser wavelength is 1900 ~ 2100nm, amplification procedure carries out mixing holmium or mix in thulium gain fibre.When random optical-fiber laser with this understanding in this wave-length coverage is used for Spectral beam combining, power can be increased to the highest, and spectrum widening does not occur.
Preferably, random optical-fiber laser is transmitted by monomode fiber, multimode fiber or conical fiber in its seed source.
The present invention additionally provides a kind of Spectral beam combining device based on random optical-fiber laser on the other hand, comprise: for generation of the Random Laser seed source of random optical-fiber laser, for carrying out the power amplification link of power amplification and the Spectral beam combining device for carrying out Spectral beam combining to random optical-fiber laser to random optical-fiber laser, the random optical-fiber laser of the light-emitting window outgoing of Random Laser seed source sequentially can pass through power amplification link and Spectral beam combining device, Random Laser seed source, between power amplification link and Spectral beam combining device be light connect.Light herein connects, and refers to the laser produced from Random Laser seed source, can pass through above-mentioned each device successively, and then complete Spectral beam combining.Each parts all can be existing all parts above.
Now the feature of each part is described below:
Random Laser seed source: be the fiber laser based on Raman gain and random Rayleigh scattering feedback can be standard-sized sheet chamber also can be half-open cavity configuration.The centre wavelength of Random Laser is the requirement according to Spectral beam combining, by selecting suitable pumping laser to control, the spectral line width of filter to produced random optical-fiber laser also can be adopted in addition accurately to control.Random Laser seed source can be any existing structure, after fully eliminating parasitic feedback, just can ensure that exporting light is random optical-fiber laser.
Power amplifier device: the power amplification being mainly used in Random Laser seed can be single stage power amplifiers, also can be the power amplification link that multi-stage power amplifier is used in conjunction.Any existing all kinds of power amplifier device.
Preferably, random optical-fiber laser needed to isolate the light of reverse transfers in random optical-fiber laser before ingoing power amplifying device, preventing light echo from entering Random Laser seed source causes parasitic some feedback to impact Random Laser seed source, between power amplifier device and Random Laser seed source, transmitting device is set, transmitting device is used for making random optical-fiber laser one-way transmission, is preferably optical isolator or circulator isolation.Now efficiency of isolation is higher.Power amplifier device gain media used can be selected according to the wavelength of Spectral beam combining, such as, can be silica fiber or the Raman gain of doping with rare-earth ions (as ytterbium ion, holmium ion, thulium ion).
Spectral beam combining device: the random optical-fiber laser be mainly used in each road is amplified through power amplifier is combined into beam of laser, synthesis mode can be arbitrary existing synthesis mode, and preferred Spectral beam combining device is that grating closes bundle Spectral beam combining device or dichroic mirror closes bundle Spectral beam combining device.Now Spectral beam combining efficiency is higher.
Preferably, Random Laser seed source comprises pumping source, backward smooth spacer assembly and the passive optical fiber that sequentially light connects, and pumping source is for generation of laser, and passive optical fiber is used for providing Raman gain and random Rayleigh feedback.Adopt the Random Laser seed source of this structure can produce the random optical-fiber laser meeting necessary requirement.The laser that pumping source produces, behind accidental laser chamber, produces random optical-fiber laser.
Preferably, backward smooth spacer assembly is Fiber Bragg Grating FBG or wavelength division multiplexer.The effect that there is wavelength chooses by arranging backward smooth spacer assembly, reduce laser threshold, laser is exported from a port.
Preferably, when backward smooth spacer assembly is wavelength division multiplexer, the signal arm containing light connection with it on wavelength division multiplexer, signal arm is used for the random optical-fiber laser of export section with the Spectral beam combining device stability of monitoring based on random optical-fiber laser.
Preferably, the transmitting device for making random optical-fiber laser one-way transmission is also provided with between power amplifier device and Random Laser seed source.Transmitting device has the effect making light one-way transmission, thus realizes the protection to Random Laser seed source, prevents subsequent optical path from producing backward feedback.Affect the raising of laser beam power.
Preferred, transmitting device is optical isolator and/or optical circulator.When transmitting device is the two, it can be the two sequentially light connection.Now can be better to the isolation effect of light echo.
Preferably, the light isolation strength of transmitting device is greater than 30dB.Now can ensure that light echo is isolated preferably, prevent the parasitic impact of some feedback on Random Laser seed source.
Preferably, also comprise filter, random optical-fiber laser enters power amplifier device after device after filtering, and the transmitance of filter is greater than 99%.Filtrablely to ignore herein with representing.By arranging filter, the live width of random optical-fiber laser being narrowed, being that 1-3nm narrows to 0.2nm by original spectrum overall height half-breadth, and spectrum widening can not occurring.The connected mode of filter herein can for can make light from Random Laser seed source ingoing power amplifying device.Filter can be narrow band fiber bragg grating or absorption-type filter plate.Filter can be reflection-type or infiltration type.
Preferably, transmitting device is the optical circulator comprising at least 3 optical transport ends, the exit end of Random Laser seed source is connected with the first optical transport end light of optical circulator, second optical transport end of optical circulator is connected with filter light, and the 3rd optical transport end of optical circulator is connected with power amplifier device light.Filter can be narrowband reflection mirror, also can be narrow band fiber Bragg grating.Adopt this structure, the control to random optical-fiber laser live width can better be realized.Optical circulator herein can be n.Now filter used is reflection-type, thus realizes the reflection to light.
Preferred, filter is reflection-type.Thus make filter can be applicable to the transmitting device of wider scope.
See Fig. 1 ~ 2, the laser that pumping source 1 produces is injected in the accidental laser chamber that is made up of the anti-Fiber Bragg Grating FBG of height 2 and passive optical fiber 3, producing typical spectral width is the Random Laser of 1-3nm, after laser produces after the optical isolator 4 that isolation is 40dB, ingoing power amplifying device 5.
See Fig. 6, to ask narrower Random Laser seed spectrum, access filter 8 after optical isolator 4, its median filter 8 can be that mating plate considered by arrowband, also can be narrow band fiber Bragg grating.Random Laser spectrum after amplification can keep the characteristic of seed preferably.Laser that multichannel after amplification is identical (101,102 ... n) in Spectral beam combining device 9, Spectral beam combining is carried out.
See Fig. 3, the laser that pumping source 1 produces is injected in the accidental laser chamber that is made up of the anti-Fiber Bragg Grating FBG of height 2 and passive optical fiber 3, producing transmission typical spectral width is the random optical-fiber laser of 1-3nm, through the optical circulator 7 ingoing power amplifying device 5 of isolation at least 40dB after this laser produces.Isolation effect can be increased by the mode adding optical circulator.To ask narrower Random Laser seed spectrum, can adopt the mode of Fig. 7, access filter 8 after optical circulator 7, now filter is reflection-type.Random Laser spectrum after amplification can keep the characteristic of seed laser preferably.Optical circulator 7 also has another output 71, can use as required.Filter 8 is connected with another output 71 of optical circulator 7.After amplification, laser that multichannel is identical (101,102 ... n) in Spectral beam combining device 9, carry out Spectral beam combining, synthesis mode is not limit.
See Fig. 4, the laser that pumping source 1 produces is injected in the accidental laser chamber that is made up of wavelength division multiplexer 6 and passive optical fiber 3, can produce in former and later two directions the Random Laser that typical spectral width is 1-3nm.The random optical-fiber laser of part is derived by signal arm 61, for monitoring the stability of whole device.After laser produces, fl transmission light is through the optical isolator 4 ingoing power amplifying device 5 of isolation at least 40dB.The mode that can be connected in series by cascade increases isolation effect.To ask narrower Random Laser seed spectrum, can adopt the mode of accompanying drawing 6, access filter 8 after optical isolator 4, its median filter 8 can be that mating plate considered by arrowband, also can be narrow band fiber Bragg grating.Laser that multichannel after amplification is identical (101,102 ... 10N) in Spectral beam combining device 9, carry out Spectral beam combining.Also optical circulator 7 can be replaced with see the optical isolator 4 in Fig. 5, Fig. 4 embodiment.Optical circulator 7 can make light one-way transmission, also has multiple light exit simultaneously, and another way outlet can also arrange another output 71.
See Fig. 1,6,7, the laser that source 1 produces is injected in the accidental laser chamber that is made up of wavelength division multiplexer 6 and passive optical fiber 3, and former and later two directions produce the Random Laser that typical spectral width is 1-3nm.After laser produces, fl transmission light enters power amplifier device 5 after the optical circulator 7 of isolation at least 30dB.
To ask narrower Random Laser seed spectrum, can adopt the mode of accompanying drawing 7, access filter 8 after optical circulator 7, its median filter 8 can be narrowband reflection mirror, also can be narrow band fiber Bragg grating.Random Laser spectrum after amplification can keep the characteristic of seed preferably.Laser that multichannel after amplification is identical (101,102 ... 10N) in Spectral beam combining device 9, carry out Spectral beam combining, synthesis mode is not limit.
Amplification test result is carried out as shown in Figure 8 to the Random Laser all based on the Spectral beam combining device of random optical-fiber laser provided by the invention, this laser is being amplified to a spectral characteristic when kilowatt hour still can keep seed, along with the raising of power output, the 10dB live width of spectrum remains unchanged substantially, and this demonstrates the feasibility of Random Laser for Spectral beam combining.
Clear scope of the present invention is not restricted to example discussed above by those skilled in the art, likely carries out some changes and amendment to it, and does not depart from the scope of the present invention of appended claims restriction.Although oneself is through detailed icon in the accompanying drawings and the description and describe the present invention, such explanation and to describe be only to illustrate or schematically, and nonrestrictive.The present invention is not limited to the disclosed embodiments.
By to accompanying drawing, the research of specification and claims, it will be appreciated by those skilled in the art that when implementing of the present invention and realize the distortion of the disclosed embodiments.In detail in the claims, term " comprises " does not get rid of other steps or element, and indefinite article " " or " one " are not got rid of multiple.The fact of some measure of quoting in mutually different dependent claims does not mean that the combination of these measures can not be advantageously used.Any reference marker in claims does not form the restriction to scope of the present invention.
Claims (10)
1. based on a Spectral beam combining method for random optical-fiber laser, it is characterized in that, comprise the following steps: carry out described Spectral beam combining using random optical-fiber laser as seed light source, obtain synthetic laser; Described random optical-fiber laser is produced by Random Laser seed source.
2. the Spectral beam combining method based on random optical-fiber laser according to claim 1, it is characterized in that, also comprise the step of described random optical-fiber laser being carried out to power amplification, when described random optical-fiber laser wavelength is 1040nm ~ 1120nm, described amplification procedure carries out mixing in ytterbium gain fibre;
When described random optical-fiber laser wavelength is 1900 ~ 2100nm, described amplification procedure carries out mixing holmium or mix in thulium gain fibre.
3. one kind for described in claim 1 or 2 based on the device of the Spectral beam combining method of random optical-fiber laser, it is characterized in that, comprise: for generation of the Random Laser seed source of random optical-fiber laser, for carrying out the power amplifier device of power amplification and the Spectral beam combining device for carrying out Spectral beam combining to described random optical-fiber laser to described random optical-fiber laser
For light is connected between described Random Laser seed source with described power amplification link, for light is connected between described power amplification link with described Spectral beam combining device.
4. the Spectral beam combining device based on random optical-fiber laser according to claim 3, it is characterized in that, described Random Laser seed source comprises pumping source, backward smooth spacer assembly and the passive optical fiber that sequentially light connects, described pumping source is for generation of laser, and described passive optical fiber is used for providing Raman gain and random Rayleigh feedback.
5. the Spectral beam combining device based on random optical-fiber laser according to claim 4, is characterized in that, described backward smooth spacer assembly is Fiber Bragg Grating FBG or wavelength division multiplexer.
6. the Spectral beam combining device based on random optical-fiber laser according to claim 5, it is characterized in that, described backward smooth spacer assembly is described wavelength division multiplexer, signal arm containing light connection with it on described wavelength division multiplexer, described signal arm is used for random optical-fiber laser described in export section to monitor the described stability based on the Spectral beam combining device of random optical-fiber laser.
7. the Spectral beam combining device based on random optical-fiber laser according to any one of claim 3 ~ 6, it is characterized in that, between described power amplifier device and described Random Laser seed source, being also provided with the transmitting device for making described random optical-fiber laser one-way transmission.
8. the Spectral beam combining device based on random optical-fiber laser according to claim 7, it is characterized in that, also comprise the filter be connected with described power amplifier device light, described random optical-fiber laser enters described power amplifier device after described filter, and the transmitance of described filter is greater than 99%.
9. the Spectral beam combining device based on random optical-fiber laser according to claim 8, is characterized in that, the light isolation strength of described transmitting device is greater than 30dB.
10. the Spectral beam combining device based on random optical-fiber laser according to claim 9, it is characterized in that, described transmitting device is the optical circulator comprising at least 3 optical transport ends, the exit end of described Random Laser seed source is connected with the first optical transport end light of described optical circulator, second optical transport end of described optical circulator is connected with described filter light, and the 3rd optical transport end of described optical circulator is connected with described power amplifier device light; Described filter is reflection-type.
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| CN111463649A (en) * | 2020-03-10 | 2020-07-28 | 清华大学 | High-power optical fiber laser generation device and method thereof |
| CN112344971A (en) * | 2020-11-03 | 2021-02-09 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
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| CN104617470A (en) * | 2015-01-12 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Thulium-doped optical fiber laser pump method utilizing erbium-doped random optical fiber laser |
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| CN104617470A (en) * | 2015-01-12 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Thulium-doped optical fiber laser pump method utilizing erbium-doped random optical fiber laser |
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| CHRISTIAN WIRTH ET AL.: "High average power spectral beam combining of four fiber amplifiers to 8.2kW", 《OPTICS LETTERS》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463649A (en) * | 2020-03-10 | 2020-07-28 | 清华大学 | High-power optical fiber laser generation device and method thereof |
| CN111463649B (en) * | 2020-03-10 | 2021-02-12 | 清华大学 | High-power optical fiber laser generation device and method thereof |
| CN112344971A (en) * | 2020-11-03 | 2021-02-09 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
| CN112344971B (en) * | 2020-11-03 | 2022-06-21 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
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