CN106911063B - Polarize random fiber pulse laser - Google Patents
Polarize random fiber pulse laser Download PDFInfo
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- CN106911063B CN106911063B CN201710255278.7A CN201710255278A CN106911063B CN 106911063 B CN106911063 B CN 106911063B CN 201710255278 A CN201710255278 A CN 201710255278A CN 106911063 B CN106911063 B CN 106911063B
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Classifications
-
- 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
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
-
- 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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- 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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
-
- 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
-
- 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
Abstract
The present invention provides a kind of random fiber pulse laser of polarization, including laser, beam synthesizing device, the periodic dispersion profile fiber being made of concatenated positive dispersion fiber and negative dispersion optical fiber, superweak evanscent field optical fiber and coupler, the first input end of the output end connection beam synthesizing device of laser, the first end of the output end connection periodic dispersion profile fiber of beam synthesizing device, the second end of periodic dispersion profile fiber connects the input terminal of coupler by superweak evanscent field optical fiber, the second output terminal of the first output end connection beam synthesizing device of coupler, second output terminal is for exporting polarization Random Laser.The present invention utilizes the periodic dispersion characteristic of periodic dispersion profile fiber, so that laser is generated parameter wild effect, and realize four-wave mixing using the nonlinear characteristic of superweak evanscent field optical fiber, the second output terminal of coupler is made to export polarization Random Laser.
Description
Technical field
The invention belongs to field of lasers, and in particular to a kind of random fiber pulse laser of polarization.
Background technique
Polarizing random fiber pulse laser has many advantages, such as that simple structure, good heat dissipation effect, output coupling are convenient, is protecting
The fields such as close optic communication, random bit source are with a wide range of applications.However, existing complete optical fiber polarization Random Laser source master
Random polarization processing is carried out to fiber pulse laser using around inclined device.It is limited by around inclined device speed, bandwidth is lower.Existing rank
Section temporarily has the fiber pulse laser of random polarization without directly generation.
Summary of the invention
The present invention provides a kind of random fiber pulse laser of polarization, can not directly be generated with solving current pulse laser
There is the problem of laser of random polarization.
According to a first aspect of the embodiments of the present invention, provide a kind of polarization random fiber pulse laser, including laser,
Beam synthesizing device, superweak suddenly dies at the periodic dispersion profile fiber being made of concatenated positive dispersion fiber and negative dispersion optical fiber
Field optical fiber and coupler, the output end of the laser connect the first input end of the beam synthesizing device, the light beam
The output end of synthesizer connects the first end of the periodic dispersion profile fiber, and the of the periodic dispersion profile fiber
Two ends connect the input terminal of the coupler by the superweak evanscent field optical fiber, and the first output end of the coupler connects institute
The second output terminal of beam synthesizing device is stated, the second output terminal of coupler is for exporting polarization Random Laser；
Using the periodic dispersion characteristic of the periodic dispersion profile fiber, laser is made to generate parameter wild effect,
And four-wave mixing is realized using the nonlinear characteristic of the superweak evanscent field optical fiber, to make the second output terminal of the coupler
Export the polarization Random Laser.
In an optional implementation manner, the beam synthesizing device includes bundling device, pumping gain fibre and covering
Power stripper, wherein the first input end of the bundling device connects the output end of the laser, the second input terminal connects institute
The first output end of coupler is stated, output end passes sequentially through the pumping gain fibre and connects the week with Cladding Power Stripper
The first end of phase property dispersion profile optical fiber.
In another optional implementation, the pumping gain fibre is co-doped with light using high-power double cladding bait ytterbium
Fibre, using the high-power double cladding pump technology based on the bundling device and high-power double cladding erbium-ytterbium co-doped fiber, to improve
The power of the laser of the coupler second output terminal output and repetition.
In another optional implementation, the Cladding Power Stripper and the periodic dispersion profile fiber it
Between be provided with the unrelated isolator of polarization.
In another optional implementation, it is provided between the periodic dispersion optical fiber and superweak evanscent field optical fiber
Polarization Controller.
In another optional implementation, broadband is provided between the superweak evanscent field optical fiber and the coupler
Filter.
In another optional implementation, the superweak evanscent field optical fiber is one of following three kinds of structures:
Structure one, the superweak evanscent field optical fiber use tapered fiber, and the tapered fiber adsorption has saturable suction
Receive material；The tapered fiber is drawn cone processing by standard single-mode fiber and is obtained, and it is micro- that the minimum diameter on tapered fiber is greater than 15
Meter, for the maximum gauge on tapered fiber less than 30 microns, the drawing cone balance section length on tapered fiber is greater than 1 centimetre；
Using corrosion optical fiber, the corrosion optical fiber surface is adsorbed with saturable suction for structure two, the superweak evanscent field optical fiber
Receive material；Standard single-mode fiber of the covering that the corrosion optical fiber is after partial corrosion；
Structure three, the superweak evanscent field optical fiber use photonic crystal fiber, on the inner hole wall of the photonic crystal fiber
It is adsorbed with saturable absorption material.
In another optional implementation, the saturable absorption material uses graphene, carbon nanotube, quantum dot
Or topological insulator.
The beneficial effects of the present invention are:
1, the present invention can make laser generate parameter by the periodic dispersion characteristic using periodic dispersion profile fiber
Wild effect, and four-wave mixing is realized using the nonlinear characteristic of superweak evanscent field optical fiber, the second of coupler can be made
Output end directly exports polarization Random Laser, in addition, the present invention can generate more quickly by using superweak evanscent field optical fiber
Laser, and may be implemented also operate normally under watt magnitude optical power, generate ultrashort laser pulse；
2, the present invention does not introduce pump light using 980/1550 wavelength division multiplexer of single mode, but makes the pumping
Gain fibre is high-power double cladding erbium-ytterbium co-doped fiber, is co-doped with light using based on the bundling device and high-power double cladding bait ytterbium
Fine high-power double cladding pump technology, not only can improve pump power and efficiency, can also improve the coupler
The power of the laser of second output terminal output and repetition；
3, the present invention polarizes unrelated isolator by increasing, and the unidirectional operation in laser cavity may be implemented；
4, the present invention can optimize the polarization state of entire laser cavity by increasing Polarization Controller；
5, the present invention by setting bandwidth filter, may be implemented entire laser cavity bandwidth filtering, with meet polarization with
The output requirement of machine laser.
Detailed description of the invention
Fig. 1 is one embodiment structural schematic diagram that the present invention polarizes random fiber pulse laser；
Fig. 2 is another example structure schematic diagram that the present invention polarizes random fiber pulse device.
Specific embodiment
Technical solution in embodiment in order to enable those skilled in the art to better understand the present invention, and make of the invention real
The above objects, features, and advantages for applying example can be more obvious and easy to understand, with reference to the accompanying drawing to technical side in the embodiment of the present invention
Case is described in further detail.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " connection " should do broad sense reason
Solution, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can be directly connected, it can also
Indirectly connected through an intermediary, for the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term.
Referring to Fig. 1, one embodiment structural schematic diagram of random fiber pulse laser is polarized for the present invention.The polarization with
Machine fiber pulse laser may include laser 110, beam synthesizing device 120, by concatenated positive dispersion fiber 131 and negative color
Periodic dispersion profile fiber 130, superweak evanscent field optical fiber 140 and the coupler 150 that astigmatism fibre 132 is constituted, the laser
The output end of device 110 connects the first input end of the beam synthesizing device 120, the output end of the beam synthesizing device 120
The first end of the periodic dispersion profile fiber 130 is connected, the second end of the periodic dispersion profile fiber 130 passes through institute
The input terminal that superweak evanscent field optical fiber 140 connects the coupler 150 is stated, the first output end of the coupler 150 connects institute
The second output terminal of beam synthesizing device 120 is stated, the second output terminal of coupler 150 is for exporting polarization Random Laser；It utilizes
The periodic dispersion characteristic of the periodic dispersion profile fiber 130 makes laser generate parameter wild effect, and described in utilization
The nonlinear characteristic of superweak evanscent field optical fiber 140 realizes four-wave mixing, to make described in the second output terminal output of coupler 150
Polarize Random Laser.
In the present embodiment, which can have strong dissipativeness and high non-linearity, and it can be pumped for 980nm
Laser, by the way of forward pumping, which can be single-input double-output, and its first output end and second
The light of output end point ratio are as follows: 9:1；Superweak evanscent field optical fiber 140 can be one of following three kinds of structures:
Structure one, the superweak evanscent field optical fiber use tapered fiber, and the tapered fiber adsorption has saturable suction
Receive material；The tapered fiber is drawn cone processing by standard single-mode fiber and is obtained, and it is micro- that the minimum diameter on tapered fiber is greater than 15
Meter, for the maximum gauge on tapered fiber less than 30 microns, the drawing cone balance section length on tapered fiber is greater than 1 centimetre.The structure
One production method can be with are as follows: will standard single-mode fiber draw cone processing after be immersed in saturable absorption material solution, to satisfy
After being adsorbed onto optical fiber surface with absorbing material, optical fiber taking-up is placed in drying in vacuum tank, after the completion of to be dried, which is
It is made.Wherein, the time that optical fiber impregnates in the solution is longer, and the amount of the saturable absorption material of optical fiber surface attachment is more,
The saturable absorption material of attachment is more, and fibre loss is bigger, therefore, in production, should control fibre loss certain
Range, a kind of relatively simple control means are that one end of optical fiber is passed through to the 980nm laser of 100mW, another termination of optical fiber
Power meter in soaking process, observes the reading of power meter in real time, when fibre loss reaches 1~3dB, should just stop impregnating behaviour
Make.
Using corrosion optical fiber, the corrosion optical fiber surface is adsorbed with saturable suction for structure two, the superweak evanscent field optical fiber
Receive material；Standard single-mode fiber of the covering that the corrosion optical fiber is after partial corrosion.Wherein, the corrosion optical fiber is by standard
Single mode optical fiber corrodes through hydrofluoric acid solution and obtained: the covering of standard single-mode fiber is by hydrofluoric acid solution partial corrosion, after corrosion, mark
The diameter of quasi-monomode fiber is 20~40 microns.The production method of the structure two can be with are as follows: soaks after corroding standard single-mode fiber
Bubble is in saturable absorption material solution, and after saturable absorption material is adsorbed onto optical fiber surface, optical fiber taking-up is placed in vacuum
Dry in case, after the completion of to be dried, which is made.Wherein, the time that optical fiber impregnates in the solution is longer, and optical fiber surface is attached
Saturable absorption material amount it is more, the saturable absorption material of attachment is more, and fibre loss is bigger, therefore,
When production, fibre loss should be controlled in a certain range, a kind of relatively simple control means are to be passed through one end of optical fiber
The 980nm laser of 100mW, another termination power meter of optical fiber in soaking process, observe the reading of power meter in real time, work as optical fiber
When loss reaches 1~3dB, it should just stop dip operation.In addition, the length of the corrosion optical fiber can be 1 to 5 centimetre.
Structure three, the superweak evanscent field optical fiber use photonic crystal fiber, on the inner hole wall of the photonic crystal fiber
It is adsorbed with saturable absorption material.Wherein, the model of the photonic crystal fiber are as follows: macropore thin-walled shaddock type PCF (photonic
Crystal fiber, photonic crystal fiber).The production method of the structure three can be with are as follows: uses siphonic effect, inhales saturable
It receives material solution to be filled into the airport of photonic crystal fiber, then optical fiber is placed in vacuum tank to dry, completion to be dried
Afterwards, which is made.
It is to be noted that saturable absorption material can use graphene, carbon nanotube, quantum dot or open up in the present invention
Insulator is flutterred, wherein graphene can be graininess；The carbon nanotube can for graininess (ultrashort single-walled carbon nanotube, directly
Diameter 1-2nm, length 1-3nm)；The quantum dot is by taking MoS2 as an example, is black solid powder；The topological insulator, with
It is lenticular for Sb2Te3.In addition, no matter superweak evanscent field optical fiber is which kind of structure in above-mentioned three kinds of structures, in order to right
Superweak evanscent field optical fiber is protected, and can will be made in container that the superweak evanscent field optical fiber is enclosed in sealing in application
With.In addition, the length of the photonic crystal fiber can be 1 to 5 centimetre.
The pump light for being input to superweak evanscent field optical fiber 140 not only can be in the non-linear spy of superweak evanscent field optical fiber 140
Property under realize four-wave mixing, and pump light is after entering superweak evanscent field optical fiber 140, and pump light is not directly and saturable
Absorbing material interacts, but only faint evanscent field can break through the mould field constraint of optical fiber, with saturable absorption
Material interacts.Specifically, the mode of directly transmission saturable absorption material is generallyd use in existing pulse laser,
The end face that very thin diaphragm sticks on optical fiber is made in saturable absorption material, but due to being limited by mode field area,
The optical power of watt magnitude is easy to burn out saturable absorption material diaphragm.This patent, can by using superweak evanscent field optical fiber
Saturated absorption material is adsorbed in optical fiber, rather than fiber end face, and superweak evanscent field optical fiber can be made to have ultrafast saturated absorption
Characteristic and relaxation time can enable superweak evanscent field optical fiber actively rapidly modulate the damage in laser cavity in this way
Consumption makes each laser longitudinal module of script phase random distribution realize PGC demodulation, even if also can normally transport under watt magnitude optical power
Row, generates ultrashort laser pulse.It can be seen that the present invention can generate more quickly by using superweak evanscent field optical fiber
Laser, and may be implemented also operate normally under watt magnitude optical power, generate ultrashort laser pulse.
As seen from the above-described embodiment, the present invention is special by the periodic dispersion using periodic dispersion profile fiber 130
Property, laser can be made to generate parameter wild effect, and realize four using the nonlinear characteristic of superweak evanscent field optical fiber 140
Wave mixing can make the second output terminal of coupler 150 directly export polarization Random Laser.
Referring to fig. 2, another example structure schematic diagram of random fiber pulse laser is polarized for the present invention.Fig. 2 with
The difference of the random fiber pulse laser of polarization shown in Fig. 1 is, the beam synthesizing device 120 may include bundling device 121,
Gain fibre 122 and Cladding Power Stripper 123 are pumped, wherein the first input end of the bundling device 121 connects the laser
The output end of device 110, the second input terminal connect the first output end of the coupler 150, and output end passes sequentially through the pumping
Gain fibre 122 and Cladding Power Stripper 123 connect the first end of the periodic dispersion profile fiber 130.
In the present embodiment, bundling device is the output of dual input list.Pump laser 110 exports the continuous laser of 980nm first
It is coupled in pumping gain fibre 122 by bundling device 121, gain process is carried out by pumping gain fibre 122, is then transferred to
Cladding Power Stripper 123 filters the pump light in pumping 122 covering of gain fibre by Cladding Power Stripper 123.Carry out
When light beam synthesizes, the present invention does not use 980/1550 wavelength division multiplexer of single mode to introduce pump light, but makes the pump
Pu gain fibre is high-power double cladding erbium-ytterbium co-doped fiber, using based on the bundling device and high-power double cladding erbium and ytterbium codoping
The high-power double cladding pump technology of optical fiber, not only can improve pump power and efficiency, can also improve the coupling
The power of the laser of 150 second output terminal of device output and repetition.
The difference of the random fiber pulse laser of polarization shown in Fig. 2 and Fig. 1 also resides in, the Cladding Power Stripper 123
The unrelated isolator 210 of polarization is provided between the periodic dispersion profile fiber 130.The present invention is unrelated by increasing polarization
The unidirectional operation in laser cavity may be implemented in isolator.
The difference of the random fiber pulse laser of polarization shown in Fig. 2 and Fig. 1 also resides in, the periodic dispersion optical fiber 130
Polarization Controller 220 is provided between superweak evanscent field optical fiber 140.The present invention can be optimized by increasing Polarization Controller
The polarization state of entire laser cavity.
The difference of the random fiber pulse laser of polarization shown in Fig. 2 and Fig. 1 also resides in, the superweak evanscent field optical fiber 140
Broadband filter 230 is provided between the coupler 150.The present invention may be implemented entire by setting bandwidth filter
The bandwidth of laser cavity filters, to meet the output requirement of polarization Random Laser.Wherein, which can be high function
Rate bandwidth filter, filtering bandwidth can bear the optical power of watt magnitude or more between 15-25 nm.
As seen from the above-described embodiment, the present invention, can by the periodic dispersion characteristic using periodic dispersion profile fiber
So that laser generates parameter wild effect, and four-wave mixing is realized using the nonlinear characteristic of superweak evanscent field optical fiber, it can
So that the second output terminal of coupler directly exports polarization Random Laser.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (8)
1. a kind of random fiber pulse laser of polarization, which is characterized in that including laser, beam synthesizing device, by concatenated
Periodic dispersion profile fiber, superweak evanscent field optical fiber and the coupler that positive dispersion fiber and negative dispersion optical fiber are constituted, it is described
The output end of laser connects the first input end of the beam synthesizing device, and the output end of the beam synthesizing device connects institute
The first end of periodic dispersion profile fiber is stated, the second end of the periodic dispersion profile fiber passes through the superweak evanscent field
Optical fiber connects the input terminal of the coupler, and it is second defeated to connect the beam synthesizing device for the first output end of the coupler
Outlet, the second output terminal of coupler is for exporting polarization Random Laser；
Using the periodic dispersion characteristic of the periodic dispersion profile fiber, laser is made to generate parameter wild effect, and benefit
Four-wave mixing is realized with the nonlinear characteristic of the superweak evanscent field optical fiber, so that the second output terminal of the coupler be made to export
The polarization Random Laser.
2. the random fiber pulse laser of polarization according to claim 1, which is characterized in that the beam synthesizing device packet
Bundling device, pumping gain fibre and Cladding Power Stripper are included, wherein the first input end of the bundling device connects the laser
The output end of device, the second input terminal connect the first output end of the coupler, and output end passes sequentially through the pumping gain light
Fibre connects the first end of the periodic dispersion profile fiber with Cladding Power Stripper.
3. the random fiber pulse laser of polarization according to claim 2, which is characterized in that the pumping gain fibre is adopted
With high-power double cladding erbium-ytterbium co-doped fiber, the Gao Gong based on the bundling device and high-power double cladding bait ytterbium co-doped fiber is utilized
Rate double clad pump technology, to improve power and the repetition of the laser that the coupler second output terminal exports.
4. the random fiber pulse laser of polarization according to claim 2, which is characterized in that the Cladding Power Stripper
The unrelated isolator of polarization is provided between the periodic dispersion profile fiber.
5. the random fiber pulse laser of polarization as claimed in any of claims 1 to 4, which is characterized in that described
Polarization Controller is provided between periodic dispersion optical fiber and superweak evanscent field optical fiber.
6. the random fiber pulse laser of polarization according to claim 5, which is characterized in that the superweak evanscent field optical fiber
Broadband filter is provided between the coupler.
7. the random fiber pulse laser of polarization according to claim 1, which is characterized in that the superweak evanscent field optical fiber
For one of following three kinds of structures:
Structure one, the superweak evanscent field optical fiber use tapered fiber, and the tapered fiber adsorption has saturable absorption material
Material；The tapered fiber is drawn cone processing by standard single-mode fiber and is obtained, and the minimum diameter on tapered fiber is greater than 15 microns, draws
The maximum gauge on optical fiber is bored less than 30 microns, the drawing cone balance section length on tapered fiber is greater than 1 centimetre；
Using corrosion optical fiber, the corrosion optical fiber surface is adsorbed with saturable absorption material for structure two, the superweak evanscent field optical fiber
Material；Standard single-mode fiber of the covering that the corrosion optical fiber is after partial corrosion；
Structure three, the superweak evanscent field optical fiber use photonic crystal fiber, adsorb on the inner hole wall of the photonic crystal fiber
There is saturable absorption material.
8. the random fiber pulse laser of polarization according to claim 7, which is characterized in that the saturable absorption material
Using graphene, carbon nanotube, quantum dot or topological insulator.
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