CN108988112A - A kind of vector or vortex field fiber laser - Google Patents
A kind of vector or vortex field fiber laser Download PDFInfo
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- CN108988112A CN108988112A CN201810997581.9A CN201810997581A CN108988112A CN 108988112 A CN108988112 A CN 108988112A CN 201810997581 A CN201810997581 A CN 201810997581A CN 108988112 A CN108988112 A CN 108988112A
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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
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/0675—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
- H01S3/06791—Fibre 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
- H01S3/10061—Polarization control
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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
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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Abstract
The embodiment of the invention discloses a kind of vector or vortex field fiber lasers.The optical fiber laser includes the pumping source connected by single mode optical fiber, wavelength division multiplexer, doped gain fiber, mode locker formation annular chamber；Annular chamber further includes one or four fiber port circulators, the first port of four fiber port circulators and the 4th port are connected to annular chamber, the second port of four fiber port circulators is provided with reflector, and the third port of four fiber port circulators is disposed with long period dual mode optical fiber grating, the first Polarization Controller and collimation output end.Vector or vortex field fiber laser provided in an embodiment of the present invention, is conducive to the laser pulse of the vector for generating high-purity or the distribution that is vortexed, while greatly improving light field generation efficiency, reduces the use cost of such laser.
Description
Technical field
The present embodiments relate to laser technology more particularly to a kind of vector or vortex field fiber lasers.
Background technique
Extraordinary light field optical fiber laser is the optical fiber laser for referring to directly export extraordinary light field from laser resonator,
Wherein extraordinary light field includes vectorial field, vortex light field and mixing light field.Ultrafast laser refer to using saturable absorber or
Other are led passive technology and realize that zlasing mode locks in resonant cavity of fibre-optical laser, and make to export laser to become is skin in the time domain
The pulse of second or subpicosecond magnitude width.
For step change type dual mode optical fiber, when the normalized frequency V of optical fiber is between 2.4048 to 3.832, dual mode optical fiber
Support basic mode (HE11) and high-order mode (TM01, TE01, HE21 ±) etc. several modes.Due to the eigen mode TM in optical fiber01And TE01
It radially and angularly polarizes respectively, so exciting TM in a fiber01Or TE01Mode can obtain radial direction or angular polarization
Vectorial field.In addition, making two degeneracy HE using Polarization Controller21When phase difference is pi/2 between mode, linear superposition forms 1
Rank vortex light field.Therefore, vector, vortex light field are generated in a fiber is just converted into asking for basic mode and higher order mode directional couple
Topic.Currently, exciting the method for high-order conduction mode mainly to have dislocation welding, single mode-bimodulus tapered fiber in dual mode optical fiber.Its
Middle dislocation welding technology is to excite the higher order mode in dual mode optical fiber by transversion malposition welding single mode optical fiber and dual mode optical fiber,
The insertion loss of this device is larger, and mode conversion efficiency is lower, and is difficult to realize laser temporal mode locking；Single mode-bimodulus draws cone
Optical fiber draws cone single mode optical fiber and dual mode optical fiber that the higher order mode in photo-coupler excitation dual mode optical fiber, this side is made by melting
Formula insertion loss is smaller, and but its structure is complex, and cost of manufacture is higher, and coupling efficiency is lower.Therefore, mode converter part is inserted into
Loss height, complex manufacturing technology, launching efficiency low etc. are still the bottleneck problem for restricting extraordinary light field optical fiber laser and developing.
Summary of the invention
The embodiment of the present invention provides a kind of vector or vortex field fiber laser, to realize ultrafast vector or vortex light field
Laser output.
The embodiment of the present invention provides a kind of vector or vortex field fiber laser, including the pump connected by single mode optical fiber
Pu source, wavelength division multiplexer, doped gain fiber, mode locker form annular chamber；
The annular chamber further includes one or four fiber port circulators, the first port of the four fiber ports circulator and
Four ports are connected to the annular chamber, and the second port of the four fiber ports circulator is provided with reflector, four port
The third port of fiber optical circulator is disposed with long period dual mode optical fiber grating, the first Polarization Controller and collimation output
End.
Optionally, the reflector includes single mode optical fiber Bragg grating, single mode optical fiber reflecting mirror or plating reflectance coating end face
Single mode optical fiber.
Optionally, the screen periods range of the long period dual mode optical fiber grating is 900 μm~1300 μm, screen periods number
It is 10~90.
Optionally, the long period dual mode optical fiber grating includes that mechanical extruding type long period dual mode optical fiber grating, electric arc are put
Electric-type long period dual mode optical fiber grating, U-V writing formula long period dual mode optical fiber grating or inclined type long period dual mode optical fiber light
Grid.
Optionally, the collimation output end includes dual mode optical fiber collimator, dual mode optical fiber Bragg grating or chirp bimodulus
Fiber bragg grating.
Optionally, the dual mode optical fiber collimator includes that dual mode optical fiber input terminal, dual mode optical fiber return terminal, dual mode optical fiber are defeated
Outlet and reflector plate；
The reflector plate be located at the dual mode optical fiber input terminal light output mouth and the dual mode optical fiber output end light it is defeated
Between entrance.
Optionally, the dual mode optical fiber input terminal is multiplexed with the dual mode optical fiber return terminal.
Optionally, the reflector plate is the dual mode optical fiber end face of plated film.
Optionally, the mode locker includes saturable absorber and the second Polarization Controller；
The saturable absorber includes graphene, carbon nanotube, semiconductor saturable absorbing mirror, black phosphorus, three oxidations two
At least one of iron, ferroso-ferric oxide, ethyl alcohol, topological insulator and Transition-metal dichalcogenide.
Optionally, the saturable absorber include the sandwich structure being made of optical patchcord head absorber of satisfying,
Saturable absorber based on D- type optical fiber, the saturable absorber based on hollow optic fibre or the saturable based on punching optical fiber
Absorber.
The embodiment of the present invention provides a kind of vector or vortex field fiber laser, including the pump connected by single mode optical fiber
Pu source, wavelength division multiplexer, doped gain fiber, mode locker form annular chamber；Annular chamber further includes one or four fiber port circulators,
The first port of four fiber port circulators and the 4th port are connected to annular chamber, and the second port of four fiber port circulators is set
It is equipped with reflector, the third port of four fiber port circulators is disposed with long period dual mode optical fiber grating, the first polarization control
Device processed and collimation output end.Mode-locked laser pulse is generated by annular chamber, by long period dual mode optical fiber grating by single-mode optics
Gauss basic mode is converted into the higher order mode of vector or the distribution that is vortexed in fibre, is exported laser alignment by collimation output end.This hair
Bright embodiment is conducive to generate the laser pulse of the vector of high-purity or the distribution that is vortexed, while greatly improving light field and generating effect
Rate reduces the use cost of such laser.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of vector or vortex field fiber laser provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of mechanical extruding type long period dual mode optical fiber grating provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of dual mode optical fiber collimator provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of erbium doped fiber laser provided in an embodiment of the present invention；
Fig. 5 is a kind of ccd image of optical field distribution of erbium doped fiber laser output provided in an embodiment of the present invention；
Fig. 6 is the ccd image of the another optical field distribution of erbium doped fiber laser output provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of erbium doped fiber laser output laser pulse sequence provided in an embodiment of the present invention；
Fig. 8 is the spectral schematic of erbium doped fiber laser output vortex light field provided by Embodiment 2 of the present invention；
Fig. 9 is the pulse width schematic diagram of erbium doped fiber laser output vortex light field provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.It should be noted that
In the description of the embodiment of the present invention, the orientation or positional relationship of the instructions such as term " on ", "lower", "inner", "outside" is based on attached drawing
Shown in orientation or positional relationship or the invention product using when the orientation or positional relationship usually put, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
In the description of the embodiment of the present invention, it is also necessary to which explanation, attached drawing is not unless having specific regulation and limiting, art
Language " coupling ", " connection " shall be understood in a broad sense, for example, " coupling " may be a fixed connection, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
Upper company can be the connection inside two elements.Term " first ", " second " etc. are used for description purposes only, and are not offered as any
Sequentially, quantity or importance, and be used only to distinguish different component parts.For those of ordinary skill in the art and
Speech can understand concrete meaning of the above-mentioned predicate in of the invention with concrete condition.
Fig. 1 show a kind of structural schematic diagram of vector or vortex field fiber laser provided in an embodiment of the present invention,
The optical fiber laser includes:
Pumping source 20, the wavelength division multiplexer 30, doped gain fiber 40, the formation of mode locker 50 connected by single mode optical fiber 10
Annular chamber 100；Annular chamber 100 further includes one or four fiber port circulators 60, the first port of four fiber port circulators 60 and
4th port is connected to annular chamber 100, and the second port of four fiber port circulators 60 is provided with reflector 61, four fiber ports
The third port of circulator 60 is disposed with long period dual mode optical fiber grating 62, the first Polarization Controller 63 and collimation output
End 64.
Wherein, it is 980nm or the semiconductor laser of 1480nm that pumping source 20, which can be output wavelength, and pumping source 20 is light
Fibre output, output end are connect with the input terminal of wavelength division multiplexer 30, it is to be understood that wavelength division multiplexer 30 may include more
A input terminal, each input terminal connects a pumping source 20 or multiple wavelength division multiplexers 30 can be set in annular chamber 100, often
A wavelength division multiplexer connects a pumping source 20, and specific pump mode can be set according to actual needs.It should be noted that right
In wavelength division multiplexer 30, by taking three port wavelength division multiplexers as an example, including public input terminal, pumping input terminal and output end, wherein
Public input terminal and output end access annular chamber 100, and pumping input terminal is connect with pumping source 20, each port institute of wavelength division multiplexer
It is and the matched single mode optical fiber of corresponding transmission wavelength with optical fiber.Doped gain fiber 40 is the optical fiber of rare earth doped element, wherein
Rare earth element can be ytterbium, erbium, thulium etc., it is to be understood that different rare earth elements has different gain wavelengths, specific real
Each device parameters are arranged when applying to match with the gain wavelength of rare earth element.Mode locker 50 is for making laser realize mode locking output arteries and veins
Impulse light, can be active mode locking or passive mode-locking, and the embodiment of the present invention is not construed as limiting this.Four fiber port circulators 60 are
Optical signal is oriented to another port from a port by one unidirectional device, only carries out one-way transmission, such as first port every time
The light of input is only exported from second port, and the light of second port input is only exported from third port, and so on.Long period is double
The basic mode laser that reflector 61 reflects is converted to high-order mode by mode fiber grating 62, adjusts optical fiber by the first Polarization Controller 63
In polarization state, finely tune the spatial distribution of light field, form vector or vortex light field, collimated and exported by collimation output end 64.The
One Polarization Controller 63 can squeeze optical fiber type Polarization Controller for embedded type, and when use only needs the optical fiber in system to place
It in the slot at the top of Polarization Controller, is fixed by two baffles, the adjusting part of rotatory polarization controller is realized in optical fiber partially
The control of polarization state；First Polarization Controller 63 or the mechanical Polarization Controller of tricyclic, by optical fiber by specific when use
Mode be wrapped in the optical fiber duct in three rings, pass through adjust ring position realize optical fiber in polarization state control.
It should be noted that collimation output end 64 can under the premise of not changing optical field distribution in optical fiber, can by than
Laser energy in example output optical fibre, while continue cycling through dump energy laser back to annular chamber 100.
It continues to refer to figure 1, the course of work of the optical fiber laser are as follows: the continuous pump light that pump light source 20 issues passes through wave
Division multiplexer 30 enters the annular chamber 100 of optical fiber laser, provides pumping for doped gain fiber 40, generates swashing for another wave band
Light (such as light of Er-doped fiber generation 1550nm wave band).Then, laser is entered by 60 first port of fiber optical circulator (upper port)
It penetrates, long period dual mode optical fiber light is entered by third port (right output port) after being reflected by the reflector 61 of second port (left port)
Grid 62, are converted into higher order mode, control its output vector light field or vortex by the first Polarization Controller 63 and collimation output end 64
Light field, the vectorial field exported at this time or vortex field fiber laser are continuous light.The laser warp reflected by collimation output end 64
Four fiber port circulators 60 are returned to after crossing the first Polarization Controller 63 and long period dual mode optical fiber grating 62, then from four ports
4th port (lower port) of fiber optical circulator 60 enters mode locker 50, and continuous laser is converted pulse laser by mode locker 50,
Then pulse laser returns to wavelength division multiplexer 30 by single mode optical fiber 10, completes the circulation of a laser.As laser is intracavitary
Continuous circulation, collimate output end 64 at export optical-fiber laser become ultrafast laser, then obtained ultrafast vector or whirlpool
Optically-active field.It is understood that can be neglected since the process is exceedingly fast, i.e., it is believed that when the start-up operation of pump light source 20
Meanwhile ultrafast vector or vortex light field can be obtained by collimation output end 64.
The technical solution of the present embodiment generates mode-locked laser pulse by annular chamber, passes through long period dual mode optical fiber grating
Convert Gauss basic mode in single mode optical fiber to the higher order mode of vector or the distribution that is vortexed, it is by collimation output end that laser alignment is defeated
Out.The embodiment of the present invention is conducive to generate the laser pulse of the vector of high-purity or the distribution that is vortexed, while greatly improving light
Field generation efficiency, reduces the use cost of such laser.
Based on the above technical solution, optionally, the reflectivity of reflector 61 is greater than or equal to 70%.
It is understood that laser generates the condition of resonance that laser needs to meet resonant cavity, this is needed in resonant cavity
Light reaches some strength, and 61 reflectivity of reflector will lead to annular chamber (resonant cavity) interior light intensity when too low too low, in order to make annular
Light in chamber reaches condition of resonance, and the reflectivity for needing to be arranged reflector 61 is greater than or equal to 70%.
Optionally, reflector 61 includes single mode optical fiber Bragg grating, single mode optical fiber reflecting mirror or plating reflectance coating end face
Single mode optical fiber.
It is understood that single mode optical fiber Bragg grating is the space phase period formed in the fibre core of single mode optical fiber
Property distribution grating, the essence of effect is exactly that (transmission or reflection) filter or the reflection of narrowband are formed in fibre core
Mirror.When using single mode optical fiber Bragg grating as reflecting mirror 61, since single mode optical fiber Bragg grating has fixed wave length,
Play a dual role of filtering and reflection in optical fiber laser, optical fiber laser generates and single mode optical fiber Prague light used
The long matched vectorial field of lattice wave or vortex light field.When the single mode optical fiber using single mode optical fiber reflecting mirror or plating reflectance coating end face is made
When for reflecting mirror 61, central wavelength itself the determining by laser of optical fiber laser output, in gain spectral limit, by each ginseng
Several and operating condition determines.
Optionally, the screen periods range of long period dual mode optical fiber grating 62 is 900 μm~1300 μm, and screen periods number is
10~90.
Optionally, long period dual mode optical fiber grating 62 be index steps type long period dual mode optical fiber grating or refractive index gradually
Modification long period dual mode optical fiber grating.
It is understood that specific 62 parameter of long period dual mode optical fiber grating is determined according to actual experiment condition.
Optionally, long period dual mode optical fiber grating 62 includes mechanical extruding type long period dual mode optical fiber grating, arc discharge
Formula long period dual mode optical fiber grating, U-V writing formula long period dual mode optical fiber grating or inclined type long period dual mode optical fiber grating.
Fig. 2 show a kind of structural representation of mechanical extruding type long period dual mode optical fiber grating provided in an embodiment of the present invention
Figure.Optionally, mechanical extruding type long period dual mode optical fiber grating includes bottom plate 621, dual mode optical fiber 622 and grating pressing plate 623；
Wherein for dual mode optical fiber 622 between bottom plate 621 and grating pressing plate 623, grating pressing plate 623 contacts the side of dual mode optical fiber 622
Including dentation periodic structure, the period of dentation periodic structure is equal to the screen periods of long period dual mode optical fiber grating.
Wherein, bottom plate 621 and fiber pressuring plate 623 can be made of same metal material, by applying to grating pressing plate 623
Pressure conduction to dual mode optical fiber 622 is made dual mode optical fiber 622 by periodic pressure, its fibre core is caused to form week by pressure, tooth
Phase refractive index modulation.
Optionally, collimation output end 64 includes dual mode optical fiber collimator, dual mode optical fiber Bragg grating or chirp bimodulus light
Fine Bragg grating.
It is understood that dual mode optical fiber Bragg grating or chirp dual mode optical fiber Bragg grating being capable of reflection laser bases
Mould, through higher order mode, by the higher order mode after the conversion of long period dual mode optical fiber grating, i.e. vector or vortex light field laser is defeated
Out, remaining laser basic mode is reflected.Its parameter request is matched with laser parameter, reaches output higher order mode, returns to base
The function of mould.
Fig. 3 show a kind of structural schematic diagram of dual mode optical fiber collimator provided in an embodiment of the present invention.Optionally, bimodulus
Optical fiber collimator includes dual mode optical fiber input terminal 641, dual mode optical fiber return terminal 642, dual mode optical fiber output end 643 and reflector plate
644；Reflector plate 644 be located at dual mode optical fiber input terminal 641 light output mouth and dual mode optical fiber output end 643 optical input it
Between.
It is understood that the output and reflection due to laser are all completed by reflector plate, therefore the light field of laser was exporting
It does not change in journey.
Optionally, dual mode optical fiber input terminal is multiplexed with dual mode optical fiber return terminal.
It is understood that dual mode optical fiber input terminal and dual mode optical fiber return terminal can use same root dual mode optical fiber, letter
Change the structure of dual mode optical fiber collimator.
Optionally, reflector plate is the dual mode optical fiber end face of plated film.
Optionally, mode locker includes saturable absorber and the second Polarization Controller；Saturable absorber include graphene,
Carbon nanotube, semiconductor saturable absorbing mirror, black phosphorus, di-iron trioxide, ferroso-ferric oxide, ethyl alcohol, topological insulator and mistake
Cross at least one of metal chalcogenide compound.
Wherein, Transition-metal dichalcogenide includes molybdenum disulfide, tungsten disulfide, rhenium disulfide, two telluride molybdenums, two telluride
Tungsten, two telluride rheniums, two selenizing molybdenums, two tungsten selenides, two selenizing rheniums etc..
It is understood that the polarization state of annular endovenous laser is adjusted by the second Polarization Controller, since saturable is inhaled
The saturable absorption of acceptor acts on, and the output of optical fiber laser mode locking pulse may be implemented.
It should be noted that mode locker can also include polarization-dependent isolator and the second Polarization Controller, pass through polarization
The cooperation of dependent isolator and the second Polarization Controller forms equivalent saturable absorption using nonlinear polarization rotation
Body realizes the output of optical fiber laser mode locking pulse.
Optionally, saturable absorber includes the absorber of satisfying for the sandwich structure being made of optical patchcord head, is based on
Saturable absorber, the saturable absorber based on hollow optic fibre or the saturable absorption based on punching optical fiber of D- type optical fiber
Body.
The structure of specific saturable absorber access annular chamber can be according to actual experiment condition setting, the embodiment of the present invention
This is not construed as limiting.
It continues to refer to figure 1, optionally, annular chamber 100 further includes single mode optical fiber output coupler 70, and single mode optical fiber exports coupling
The input terminal of clutch 70 and the first output end are connected to annular chamber 100, and second output terminal exports the laser that annular chamber 100 generates.
It is understood that the second output terminal of single mode optical fiber output coupler 70 can connect oscillograph, spectrometer etc.
Measuring device is used for 100 output characteristics of measure annular chamber.
Illustratively, Fig. 4 show a kind of structural schematic diagram of erbium doped fiber laser provided in an embodiment of the present invention.It should
Erbium doped fiber laser includes the pumping source 2, wavelength division multiplexer 3, Er-doped fiber 4, output coupler connected by single mode optical fiber 1
5, four fiber port circulators 6, the second Polarization Controller 11, saturable absorber 12, wherein the of four fiber port circulators 6
First output end of Single port output coupler 5 connects, and optical fiber Bragg light is arranged in the second port of four fiber port circulators 6
Grid 7, the third port of four fiber port circulators 6 are disposed with long period dual mode optical fiber grating 8, the first Polarization Controller 9
And dual mode optical fiber collimator 10.
Specifically, pump light source 2 is 980nm semiconductor laser；The public input of the 980nm/1550nm of wavelength division multiplexer 3
Hold (left end), 980nm pumping input terminal (with 2 connecting pin of pump light source) and output end (right end)；Output coupler 5 is output 9:
The output end of 11 × 2 coupler, accounting 90% accesses annular chamber；Saturable absorber 12 is carbon nano-tube film, saturable
Absorber 12 is the sandwich structure being made of optical patchcord head, is specifically made of two single mode wire jumpers and ring flange, carbon nanometer
Pipe film is placed between single-mode fiber jumper end face and is attached by ring flange；Long period dual mode optical fiber grating 8 is machinery
Squash type long period dual mode optical fiber grating；First Polarization Controller 9 and the second Polarization Controller 11 can squeeze light for embedded type
Fine formula Polarization Controller or the mechanical Polarization Controller of tricyclic.
In the specific implementation, one can also be added between four fiber port circulators 6 and long period dual mode optical fiber grating 8
A Polarization Controller (not shown), for controlling the polarization state for being incident on the basic mode laser of long period dual mode optical fiber grating 8.
Fig. 5 show a kind of ccd image of optical field distribution of erbium doped fiber laser output provided in an embodiment of the present invention,
Left-side images are the optical field distribution of output laser before interference in Fig. 5, and centre is the vortex light for coaxially interfering obtained left-handed shape
Field distribution, right side are to interfere obtained left-handed vortex optical field distribution off axis, interference fringe by output coupler 5 second output terminal
Interfere to obtain with 10 output end of dual mode optical fiber collimator.
Fig. 6 show the ccd image of the another optical field distribution of erbium doped fiber laser output provided in an embodiment of the present invention,
Left-side images are the optical field distribution of output laser before interference in Fig. 6, and centre is the vortex light for coaxially interfering obtained dextrorotation shape
Field distribution, right side are to interfere obtained dextrorotation vortex optical field distribution off axis, interference fringe by output coupler 5 second output terminal
Interfere to obtain with 10 output end of dual mode optical fiber collimator.
Fig. 7 show the schematic diagram of erbium doped fiber laser output laser pulse sequence provided in an embodiment of the present invention.Tool
Body, oscillograph can be connected to the second output terminal of output coupler 5, erbium doped fiber laser output signal is acquired, obtain
Laser pulse timing waveform shown in Fig. 7.
Fig. 8 show the spectral schematic of erbium doped fiber laser output vortex light field provided in an embodiment of the present invention.Tool
Body, spectrometer can be connected to the output end of dual mode optical fiber collimator 10, curve a is that the vortex light field spectrum of left-handed shape is bent
Line, curve b are the curve of spectrum of the vortex light field of dextrorotation shape.
Fig. 9 show the pulse width signal of erbium doped fiber laser output vortex light field provided in an embodiment of the present invention
Figure.Specifically, autocorrelation function analyzer can be connected to the output end of dual mode optical fiber collimator 10, curve c is the vortex light of left-handed shape
Field pulse width curve, the pulse width are 6.572ps；Curve d is the pulse width curve of the vortex light field of dextrorotation shape, should
Pulse width is 5.799ps.
Erbium doped fiber laser provided in an embodiment of the present invention, by saturable absorber, long period dual mode optical fiber grating collection
At in optical fiber laser, mode-locked laser pulse is generated by annular chamber, by long period dual mode optical fiber grating by single mode optical fiber
Middle Gauss basic mode is converted into the higher order mode of vector or the distribution that is vortexed, and is exported laser alignment by dual mode optical fiber collimator.This
Inventive embodiments are conducive to generate the laser pulse of the vector of high-purity or the distribution that is vortexed, compared to traditional ultrafast optical-fiber laser
Device, not only controllable dimension is more abundant, but also the advantages of combination optical-fiber laser, vector or vortex light field, ultrashort pulse, using complete
Fiber design maintains the advantage that optical fiber laser is easy to maintain, performance is stable while greatly improving light field generation efficiency,
Reduce the use cost of such laser.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of vector or vortex field fiber laser, which is characterized in that including pumping source, the wave connected by single mode optical fiber
Division multiplexer, doped gain fiber, mode locker form annular chamber；
The annular chamber further includes one or four fiber port circulators, the first port of the four fiber ports circulator and the 4th end
Mouth is connected to the annular chamber, and the second port of the four fiber ports circulator is provided with reflector, four fiber port
The third port of circulator is disposed with long period dual mode optical fiber grating, the first Polarization Controller and collimation output end.
2. vector according to claim 1 or vortex field fiber laser, which is characterized in that the reflector includes single
Mode fiber Bragg grating, single mode optical fiber reflecting mirror or the single mode optical fiber for plating reflectance coating end face.
3. vector according to claim 1 or vortex field fiber laser, which is characterized in that the long period bimodulus light
The screen periods range of fine grating is 900 μm~1300 μm, and screen periods number is 10~90.
4. vector according to claim 1 or vortex field fiber laser, which is characterized in that the long period bimodulus light
Fine grating includes mechanical extruding type long period dual mode optical fiber grating, arc discharge formula long period dual mode optical fiber grating, U-V writing
Formula long period dual mode optical fiber grating or inclined type long period dual mode optical fiber grating.
5. vector according to claim 1 or vortex field fiber laser, which is characterized in that the collimation output end packet
Include dual mode optical fiber collimator, dual mode optical fiber Bragg grating or chirp dual mode optical fiber Bragg grating.
6. vector according to claim 5 or vortex field fiber laser, which is characterized in that the dual mode optical fiber collimation
Device includes dual mode optical fiber input terminal, dual mode optical fiber return terminal, dual mode optical fiber output end and reflector plate；
The reflector plate is located at the light output mouth of the dual mode optical fiber input terminal and the optical input of the dual mode optical fiber output end
Between.
7. vector according to claim 6 or vortex field fiber laser, which is characterized in that the dual mode optical fiber input
End is multiplexed with the dual mode optical fiber return terminal.
8. vector according to claim 6 or vortex field fiber laser, which is characterized in that the reflector plate is plated film
Dual mode optical fiber end face.
9. vector according to claim 1 or vortex field fiber laser, which is characterized in that the mode locker includes can
Saturated absorbing body and the second Polarization Controller；
The saturable absorber includes graphene, carbon nanotube, semiconductor saturable absorbing mirror, black phosphorus, di-iron trioxide, four
At least one of Fe 3 O, ethyl alcohol, topological insulator and Transition-metal dichalcogenide.
10. vector according to claim 9 or vortex field fiber laser, which is characterized in that the saturable absorption
Body includes the absorber of satisfying for the sandwich structure being made of optical patchcord head, the saturable absorber based on D- type optical fiber, base
In the saturable absorber of hollow optic fibre or based on the saturable absorber for punching optical fiber.
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| CN110200578A (en) * | 2019-05-20 | 2019-09-06 | 浙江工业大学 | Head is spied upon in all -fiber based on mechanical long-period fiber grating processed |
| CN110474226A (en) * | 2019-07-30 | 2019-11-19 | 华南理工大学 | A kind of vortex light single frequency optical fiber laser |
| CN110556690A (en) * | 2019-07-30 | 2019-12-10 | 华南理工大学 | All-fiber vortex optical rotation mode-locking annular cavity laser |
| CN110589782A (en) * | 2019-10-22 | 2019-12-20 | 中国人民解放军国防科技大学 | Vanadium diselenide two-dimensional material and synthesis and application thereof |
| CN110737089A (en) * | 2019-09-09 | 2020-01-31 | 华南师范大学 | method and system for generating chirped Airy vortex electronic plasma wave |
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| CN113131317A (en) * | 2021-03-03 | 2021-07-16 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
| CN113960010A (en) * | 2021-09-24 | 2022-01-21 | 江苏锐精光电研究院有限公司 | Dark field confocal Raman polarization spectrum measuring device and method based on vortex light beams |
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| CN110200578B (en) * | 2019-05-20 | 2024-05-07 | 浙江工业大学 | All-fiber inner snoop head based on mechanical long-period fiber grating |
| CN110200578A (en) * | 2019-05-20 | 2019-09-06 | 浙江工业大学 | Head is spied upon in all -fiber based on mechanical long-period fiber grating processed |
| CN110474226A (en) * | 2019-07-30 | 2019-11-19 | 华南理工大学 | A kind of vortex light single frequency optical fiber laser |
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| CN110589782A (en) * | 2019-10-22 | 2019-12-20 | 中国人民解放军国防科技大学 | Vanadium diselenide two-dimensional material and synthesis and application thereof |
| CN110589782B (en) * | 2019-10-22 | 2021-06-18 | 中国人民解放军国防科技大学 | Vanadium diselenide two-dimensional material and synthesis and application thereof |
| CN111103695A (en) * | 2019-11-08 | 2020-05-05 | 中国科学院上海光学精密机械研究所 | Ultrafast laser generating device |
| CN111103695B (en) * | 2019-11-08 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Ultrafast laser generating device |
| CN113131317A (en) * | 2021-03-03 | 2021-07-16 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
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| CN113960010A (en) * | 2021-09-24 | 2022-01-21 | 江苏锐精光电研究院有限公司 | Dark field confocal Raman polarization spectrum measuring device and method based on vortex light beams |
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| CN114172008A (en) * | 2021-11-08 | 2022-03-11 | 长春理工大学 | Device and method for outputting cylindrical vector beam by multi-wavelength mode-locked fiber laser |
| CN115102016A (en) * | 2022-06-06 | 2022-09-23 | 北京交通大学 | Single longitudinal mode narrow linewidth thulium-doped fiber laser |
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