CN110535022A - A kind of vortex light mode locked fiber laser based on four-wave mixing effect - Google Patents
A kind of vortex light mode locked fiber laser based on four-wave mixing effect Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
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Abstract
The invention discloses a kind of vortex light mode locked fiber laser based on four-wave mixing effect, the laser includes single longitudinal mode laser source, wavelength-tunable laser source, the first fiber coupler, image intensifer, the first Polarization Controller, orbital angular momentum mode generator, the second fiber coupler, the second Polarization Controller and vortex optical fiber.The present invention is based on four-wave mixing effects, long by tuning injection laser frequency and optimization chamber, can fully ensure that mode-locked laser operating output.Modal cutoff and optimization design based on vortex optical fiber can ensure that specific rank orbital angular momentum mode is transmitted in resonant cavity with the generation of output end and stabilization using vortex optical fibre device.Based on same order mode pumping mechanism, so that the signal light of intracavitary same order orbital angular momentum mode obtains gain and maximizes, and then the output of vortex light mode-locked laser is obtained.The present invention is based on the direct resonance mechanism of single-mode in resonant cavity, the vortex light mode-locked laser of output has many advantages, such as mode purity height and good beam quality.
Description
Technical field
The present invention relates to laser technology fields more particularly to a kind of vortex light modelocked fiber based on four-wave mixing effect to swash
Light device.
Background technique
Vortex beams are field distribution with helical phase itemexp(ilφ)A kind of light beam, each photon carries in light beamlhOrbital angular momentum (lFor topological charge number,φFor azimuth,hFor planck constant), there is annular light field distribution and spiral phase
The characteristics of position singular point.These unique properties make it be widely used in material processing, optical tweezer, high-resolution imaging, optical fiber biography
The fields such as sense and fiber optic communication.But these application prospects are to output peak power, stability, the mode purity of whirlpool light beam
More stringent requirements are proposed with bandwidth etc..Mode-locked laser is due to narrow pulse width, high-peak power, wide spectrum
The advantages that width, can satisfy such requirement.Meanwhile Mode-locked laser is in material retrofit, high field laser and substance phase
The fields such as interaction also have important application, and are applied to wavelength-division multiplex and the following high-capacity and high-speed of Optical Time Division Multiplexing realization
One of key technology of fiber optic communication.Mode-locked laser and vortex laser are combined and form mode locking pulse vortex laser, is applied
Field will more extensively.Therefore, research vortex light mode-locked laser has a very important significance.
There are two types of common frameworks for mode-locked laser: the space structure based on bulk optical element and the light based on optical fibre device
Fine framework.Compared to the former, mode locked fiber laser has apparent advantage, and the cavity configuration of one side optical fiber laser is flexible
(linear cavity or annular chamber), intracavitary adjustable parameter is more, convenient for generating mode locking pulse.Another aspect mode locked fiber laser has complete
Optical fiber cavity, and optical fiber itself has many distinctive characteristics, such as Self-phase modulation, Cross-phase Modulation, nonlinear polarization rotation
Deng rationally pulse quality can be effectively improved using these characteristics.Research about mode locked fiber laser has very much, patent
CN105428976A discloses a kind of mode locked fiber laser and pulse laser production method, produces lock using linear cavity configuration
Mould pulse.Patent CN106785842A discloses a kind of passive mode-locking fiber laser based on Cadmium arsenide's film, using annular
Cavity configuration realizes the output of high pulse energy mode locking pulse.In fact, light wave is when optical fiber transmits, due to the limitation on fibre core boundary,
What the Helmholtz equation of solution light wave transmissions obtained is discontinuous solution of electro-magnetic field, and this discontinuous field solution is known as mode,
Including fundamental transverse mode and high-order transverse mode.Stablizing the mode of transmission in conventional single mode fiber is fundamental transverse mode.And the vortex light in optical fiber
It is to be formed by stacking by the odd mould and even mould of order vectors transverse mode (HE or EH) with pi/2 phase difference, also referred to as orbital angular momentum mode.
It will be apparent that the pulse that the mode locked fiber laser of above-mentioned patent disclosure exports is fundamental transverse mode mode locking pulse, it is directly to generate
Vortex light mode locking pulse.
Currently, the method for generating vortex light mode locking pulse is to add track angle outside the output end of traditional mode locked fiber laser
Momentum Model generator or converter, that is, fundamental transverse mode mode locking pulse is converted into orbital angular momentum mode mode locking pulse, example
Such as patent CN105870768A, CN108963734A and CN108988112A.Although this method can also generate orbital angular momentum
Mode mode-locked laser, but laser activity depends critically upon the performance of orbital angular momentum mode generator or converter, exports laser
Mode purity it is relatively low, beam quality is poor.In addition, most of optical-fiber type orbital angular momentum mode generator or converter are
It is made based on single mode optical fiber and traditional less fundamental mode optical fibre or multimode fibre.Conventional single mode fiber only supports the transmission of fundamental transverse mode, tradition
Since smooth sea leads the approximate order vectors transverse mode degeneracy linearly polarized mode for making similar propagation constant in less fundamental mode optical fibre or multimode fibre
Formula is unable to satisfy the stable transmission in a fiber of orbital angular momentum mode.Therefore, turned by traditional modelocked fiber laser output
The orbital angular momentum mode mode locking pulse transmission changed is unstable.Therefore, it is steady to obtain to design a kind of mode locked fiber laser
Fixed, height mode purity orbital angular momentum mode mode-locked laser has a very important significance.
Summary of the invention
For the above problems of the prior art, the purpose of the present invention is to provide one kind to be based on four-wave mixing effect
Vortex light mode locked fiber laser.It is simple with structure, at low cost, be easy to that fibre system is integrated, output laser rail angular motion
Measure mode purity height and the good advantage of stability.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of vortex light mode locked fiber laser based on four-wave mixing effect, including single longitudinal mode laser source, tunable wave length are swashed
Light source, the first fiber coupler, image intensifer, the first Polarization Controller, orbital angular momentum mode generator, the second fiber coupling
Device, the second Polarization Controller and vortex optical fiber；
First fiber coupler has first port, second port and third port；
The orbital angular momentum mode generator has first port and second port；
Second fiber coupler has first port, second port, third port and the 4th port；
The single longitudinal mode laser source is connected to the first port of the first fiber coupler, and the wavelength-tunable laser source is connected to
The second port of first fiber coupler, the third port of first fiber coupler are connected to image intensifer, and the light is put
Big device is connected to the first port of orbital angular momentum mode generator, and first Polarization Controller is applied to image intensifer and rail
On the light of road angular momentum mode generator connection, the second port of the orbital angular momentum mode generator is connected to the second light
The third port of the first port of fine coupler, second fiber coupler is connect with the 4th port through vortex optical fiber, described
Second Polarization Controller is applied on the optical fiber of connection third port and the 4th port, the second end of second fiber coupler
Mouth output vortex light mode-locked laser.
Orbital angular momentum mode mode locked fiber laser provided by the invention is ring cavity structure, and annular chamber is by vortex optical fiber
And the device based on vortex optical fiber connects and composes.Compared to traditional less fundamental mode optical fibre or multimode fibre, the design of this vortex optical fiber is thought
Road is the contrast of refractive index for increasing fibre core and covering, and to break arrow pattern degeneracy similar in propagation constant, i.e. optical fiber is supported
Each arrow pattern effective refractive index difference be greater than 1 × 10-4, and then realize orbital angular momentum mode in intracavitary stable transmission.
The basic mode light in single longitudinal mode laser source and wavelength-tunable laser source output is dual wavelength base by closing beam after the first fiber coupler
Mould light obtains high power dual wavelength basic mode light using image intensifer.It is generated by Polarization Controller and orbital angular momentum mode
Device is converted to specific dual wavelength orbital angular momentum mode light beam.Orbital angular momentum mode light enters through the second fiber coupler
The annular chamber being made of vortex optical fiber.It, can by adjusting the output wavelength and the second Polarization Controller of wavelength-tunable laser source
To realize the multi-stage cascade four-wave mixing process of the direct resonance of orbital angular momentum mode in annular chamber.When tunable wave length laser
Source and single longitudinal mode laser source output wavelength difference are with the wavelength interval of annular chamber when consistent or integral multiple, then in the second fiber coupler
Second port export vortex light mode-locked laser.
Preferably, the single longitudinal mode laser source is narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser, and line width is low
In 1MHz, single longitudinal mode operating.
Preferably, the wavelength-tunable laser source is semiconductor laser or optical fiber laser, and wavelength tuning range is
100nm。
Preferably, first fiber coupler is that single mode optical fiber is coupled with made from single mode optical fiber fused biconical taper 1 × 2
The splitting ratio of device, first port and second port is 50:50.
Preferably, the image intensifer selects the semiconductor of high-gain rare-earth-doped fiber amplifier or corresponding wave band
Image intensifer.
Preferably, the orbital angular momentum mode generator is that fusion fiber mode selects coupler, long period optical fiber
Grating or chiral fiber grating, mode conversion efficiency are greater than 70%, and mode purity is greater than 80%, and first port uses single mode optical fiber,
Second port uses vortex optical fiber.
Preferably, second fiber coupler is that vortex optical fiber is coupled with made from vortex optical fiber fused tapering 2 × 2
Device, first port, second port, third port and the 4th port are all made of vortex optical fiber.
Preferably, the vortex fiber selection supports the step-refraction index ring core light of orbital angular momentum mode stable transmission
Fibre, graded index ring core optical fiber, gradient index fibre or inverse parabolic refractive index optical fiber, each arrow pattern of transmission are effective
Refringence is greater than 1 × 10-4。
The present invention compared to the prior art, have it is below the utility model has the advantages that
1, the present invention is based on same order mode pumping mechanisms, are pumped using specific rank orbital angular momentum mode pump light to resonant cavity
Pu, so that the direct resonance of signal light of intracavitary same order orbital angular momentum mode, the zlasing mode purity is high of acquisition, beam quality
It is good；
2, the present invention obtains orbital angular momentum mode mode-locked laser using four-wave mixing effect, and regulation is simple, output laser pulse
Stability is good；
3, the present invention uses all optical fibre structure, has many advantages, such as that stability is good, is easy to fibre system and integrates, improves track angular motion
Measure the practicability and reliability of Mode for Laser.
Detailed description of the invention
Fig. 1 is the schematic diagram of the vortex light mode locked fiber laser based on four-wave mixing effect in embodiment 1.
In figure, 1- single longitudinal mode laser source, 2- wavelength-tunable laser source, the first fiber coupler of 3-, the first optical fiber of 301-
Coupler first port, the first fiber coupler of 302- second port, the first fiber coupler of 303- third port, 4- light amplification
Device, the first Polarization Controller of 5-, 6- orbital angular momentum mode generator, 601- orbital angular momentum mode generator first port,
602- orbital angular momentum mode generator second port, the second fiber coupler of 7-, the second fiber coupler of 701- first port,
The second fiber coupler of 702- second port, the second fiber coupler of 703- third port, the second fiber coupler of 704- the 4th
Port, the second Polarization Controller of 8-, 9- vortex optical fiber.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment 1
It is as shown in Figure 1 the vortex light mode locked fiber laser based on four-wave mixing effect in the present embodiment, including single longitudinal mode
Laser source 1, wavelength-tunable laser source 2, the first fiber coupler 3, image intensifer 4, the first Polarization Controller 5, track angular motion
Measure mode generator 6, the second fiber coupler 7, the second Polarization Controller 8 and vortex optical fiber 9.Wherein, the first fiber coupler 3
With first port 301, second port 302 and third port 303；Orbital angular momentum mode generator 6 has first port 601
With second port 602；Second fiber coupler 7 has first port 701, second port 702, third port 703 and the 4th end
Mouth 704；Single longitudinal mode laser source 1 is connected to the first port 201 of the first fiber coupler 2, and wavelength-tunable laser source 2 is connected to
The third port 303 of the second port 302 of first fiber coupler 3, the first fiber coupler 3 is connected to image intensifer 4, and light is put
Big device 4 is connected to the first port 601 of orbital angular momentum mode generator 6, and the first Polarization Controller 5 is applied to image intensifer 4
On the optical fiber connected with orbital angular momentum mode generator 6, the second port 602 of orbital angular momentum mode generator 6 is connected to
The first port 701 of second fiber coupler 7, the third port 703 of the second fiber coupler 7 is with the 4th port 704 through being vortexed
Optical fiber 9 connects, and the second Polarization Controller 8 is applied on the vortex optical fiber 9 of connection third port 703 and the 4th port 704, described
The second port 702 of second fiber coupler 7 exports vortex light mode-locked laser.
In the present embodiment, 1550nm narrow cable and wide optical fiber laser, line width 5kHz are selected in single longitudinal mode laser source 1；Wavelength
Tunable laser source 2 selects tunable optical fiber laser, tuning range 1500-1600nm；First fiber coupler 3 is single mode
2 × 2 couplers made from optical fiber and single mode optical fiber fused biconical taper, can be realized 1550nm wave band basic mode coupling between single mode optical fiber
It closes, the splitting ratio of third port 303 and the 4th port 304 is 50:50；Image intensifer 4 selects erbium-doped fiber amplifier；Track angle
Momentum Model generator 6 selects fusion fiber mode to select coupler, by Standard single-mode fiber and supports that topological charge number is 1
The gradient index fibre fused biconical taper of orbital angular momentum mode stable transmission is made, according in single mode optical fiber before fused biconical taper
The phase-matching condition of HE21 mode determines single mode optical fiber and gradient index fibre in HE11 mode and gradient index fibre
Diameter ratio, draw cone when basic mode is injected in single mode optical fiber, when observed in gradient index fibre maximum luminous power and
Stop drawing cone when annulus hot spot, that is, realizes the rail that topological charge number is 1 in the basic mode and gradient index fibre in single mode optical fiber
M8003 line coupling between road angular momentum mode, mode conversion efficiency 80%, mode purity 90%, first port 601 are single
Mode fiber, second port 602 are gradient index fibre；Second fiber coupler 7 is gradient index fibre and gradient refractive index
2 × 2 couplers made from rate optical fiber fused tapering can be realized the orbital angular momentum mode that topological charge number is 1 at 1550nm and exist
It is coupled between gradient index fibre, the splitting ratio of second port 702 and third port 703 is 90:10；Vortex optical fiber 9 selects branch
Hold the gradient index fibre that the orbital angular momentum mode stable that 1550nm wave band topological charge number is 1 transmits, each vector of transmission
Effective refractive index difference minimum 1.5 × 10 between mode-4, it is to be understood that the graded index light used in the present embodiment
Fibre be it is same, further decrease in optical path and be lost when ensuring the transmission of orbital angular momentum mode stable.
In the present embodiment, single longitudinal mode laser source 1 exports the basic mode light of 1550.13 nm, and wavelength-tunable laser source 2 is defeated
The basic mode light of Wavelength tunable out, closing beam by the first fiber coupler 3 is dual wavelength basic mode light, is obtained using image intensifer 4
The dual wavelength basic mode light of 1.5W.By the first Polarization Controller 5 and orbital angular momentum mode generator 6, topological charge number is converted to
For 1 dual wavelength orbital angular momentum mode light.Orbital angular momentum mode light enters through the second fiber coupler 7 by vortex optical fiber 9
The annular chamber of composition.By adjusting wavelength-tunable laser source 2 output wavelength be 1550.58nm and the second Polarization Controller,
The multi-stage cascade four-wave mixing process that the direct resonance of orbital angular momentum mode is realized in annular chamber, in the second fiber coupler 7
Second port 702 export vortex light mode-locked laser.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. a kind of vortex light mode locked fiber laser based on four-wave mixing effect, which is characterized in that the laser includes single
Longitudinal mode laser source, wavelength-tunable laser source, the first fiber coupler, image intensifer, the first Polarization Controller, orbital angular momentum
Mode generator, the second fiber coupler, the second Polarization Controller and vortex optical fiber；
First fiber coupler has first port, second port and third port；
The orbital angular momentum mode generator has first port and second port；
Second fiber coupler has first port, second port, third port and the 4th port；
The single longitudinal mode laser source is connected to the first port of the first fiber coupler, and the wavelength-tunable laser source is connected to
The second port of first fiber coupler, the third port of first fiber coupler are connected to image intensifer, and the light is put
Big device is connected to the first port of orbital angular momentum mode generator, and first Polarization Controller is applied to image intensifer and rail
On the light of road angular momentum mode generator connection, the second port of the orbital angular momentum mode generator is connected to the second light
The third port of the first port of fine coupler, second fiber coupler is connect with the 4th port through vortex optical fiber, described
Second Polarization Controller is applied on the optical fiber of connection third port and the 4th port, the second end of second fiber coupler
Mouth output vortex light mode-locked laser；
The vortex optical fiber meets high refractive index contrast so that supports in vortex optical fiber is each for the refractive index of fibre core and covering
Arrow pattern effective refractive index difference is greater than 1 × 10-4And then support the optical fiber of orbital angular momentum mode stable transmission；
The orbital angular momentum mode generator and the second fiber coupler are vortex optical fibre device, support orbital angular momentum mould
Formula is transmitted in resonant cavity with the generation of output end and stabilization；
Second fiber coupler connects and composes ring resonator through vortex optical fiber, is based on same order mode pumping mechanism, so that
The intracavitary direct resonance of same order orbital angular momentum mode, and then acquisition high-purity vortex light mode-locked laser is defeated under four-wave mixing effect
Out.
2. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
The single longitudinal mode laser source is narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser, and line width is lower than 1MHz, single longitudinal mode fortune
Turn.
3. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
The wavelength-tunable laser source is semiconductor laser or optical fiber laser, wavelength tuning range 100nm.
4. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
First fiber coupler is 1 × 2 coupler made from single mode optical fiber and single mode optical fiber fused biconical taper, first port and second
The splitting ratio splitting ratio of port is 50:50.
5. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
The image intensifer selects the semiconductor optical amplifier of high-gain rare-earth-doped fiber amplifier or corresponding wave band.
6. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
The orbital angular momentum mode generator is that fusion fiber mode selects coupler, long-period fiber grating or chiral fiber light
Grid, mode conversion efficiency are greater than 70%, and mode purity is greater than 80%, and first port uses single mode optical fiber, and second port is using vortex
Optical fiber.
7. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
Second fiber coupler is 2 × 2 couplers made from vortex optical fiber and vortex optical fiber fused tapering, first port, second
Port, third port and the 4th port are all made of vortex optical fiber.
8. a kind of vortex light mode locked fiber laser based on four-wave mixing effect according to claim 1, which is characterized in that
The vortex optical fiber is the step-refraction index ring core optical fiber for supporting the transmission of orbital angular momentum mode stable, graded index ring core light
Fine, gradient index fibre or inverse parabolic refractive index optical fiber.
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| CN111725694A (en) * | 2020-06-19 | 2020-09-29 | 南京理工大学 | Method capable of simultaneously inhibiting self-phase modulation and four-wave mixing in optical fiber laser |
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| CN113359308A (en) * | 2020-03-05 | 2021-09-07 | 深圳大学 | Focusing vortex light generator and preparation method thereof |
| CN111725694A (en) * | 2020-06-19 | 2020-09-29 | 南京理工大学 | Method capable of simultaneously inhibiting self-phase modulation and four-wave mixing in optical fiber laser |
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