CN207884064U - A kind of pulsed column vector optical fiber laser - Google Patents
A kind of pulsed column vector optical fiber laser Download PDFInfo
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- CN207884064U CN207884064U CN201820344775.4U CN201820344775U CN207884064U CN 207884064 U CN207884064 U CN 207884064U CN 201820344775 U CN201820344775 U CN 201820344775U CN 207884064 U CN207884064 U CN 207884064U
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Abstract
The utility model discloses a kind of pulsed column vector optical fiber laser, the laser includes pumping source, wavelength division multiplexer, gain fibre, first Polarization Controller, circulator, semiconductor saturable absorbing mirror, second Polarization Controller, model selection coupler and third Polarization Controller, a fiber resonance cavity is constituted between each device by way of fiber coupling, the output end of wavelength division multiplexer passes sequentially through gain fibre, first Polarization Controller is connected with the first port of circulator, the second port of circulator connects a semiconductor saturable absorbing mirror, the third port of circulator passes sequentially through the second Polarization Controller, model selection coupler is connected with the long wavelength end of wavelength division multiplexer constitutes annular chamber.The utility model combines semiconductor saturable absorbing mirror and model selection coupler, in the output end of the laser pulsed column vector laser high and efficient by a pulse stabilization, mode purity is obtained.
Description
Technical field
The utility model is related to a kind of pulsed column vector optical fiber lasers, can be used for field of laser device technology.
Background technology
Ultra-short pulse laser has important application in numerous areas, such as laser processing, laser medicine operation, high field laser
With matter interaction and laser fusion etc., while being also to be realized applied to WDM/OTDM (wavelength-division multiplex and Optical Time Division Multiplexing)
One of the key technology of the following high-capacity and high-speed fiber optic communication.Column vector laser includes angularly polarized light and radial polarisation light, because
To have symmetrical polarization characteristic and strength characteristics, poly- characteristic of the particularly radial polarised light under high-NA, by more
Carry out more concerns, is widely used in the necks such as material processing, optical tweezer, Fibre Optical Sensor, surface plasma excitation and fiber optic communication
Domain.Pulsed column vector laser is formed when ultra-short pulse laser and column vector laser combine, the advantages of two kinds of laser combines, application
Field is more extensive, for example, can be used as optical fiber telecommunications system perfect light source, but also light sensing, detection diagnosis, it is non-linear
The various fields such as optics, biomedicine, military affairs have broad application prospects.
Mode locked fiber laser is widely paid close attention to all the time as one of the main method for generating ultrashort pulse,
Compared with other mode-locking techniques, semiconductor saturable absorbing mirror (SESAM, Semiconductor Saturable is utilized
Absorber Mirror) realize all -fiber passive mode-locking laser, be not necessarily to any active device, it is simple in structure, to change of cavity length
It is insensitive, it can be achieved that self-starting and stable mode-locking.The production method of column vector laser includes mainly two kinds：The first is to utilize mistake
The method of position generates high-order mode, inhibits basic mode to generate column vector laser as modeling unit in conjunction with few mould grating.However, light
The method of fibre dislocation, which has, to be significantly lost, and the slope of column vector optical fiber laser is reduced.Second is to utilize model selection
Coupler generates column vector laser as pattern conversion and mode splitting unit, compared to the method using dislocation, has more
Small loss and higher column vector optical fiber laser slope efficiency.However, generating column currently based on model selection coupler
Vector laser is limited in that：(1) the pulsed column vector laser generated is unstable and mode purity is not high；(2) pass through tradition
Prestretching melting coupling draw the method preparation mode coupler of cone, loss is big, complex process；(3) currently with model selection
Coupler is only capable of generating continuous column vector laser, it is still desirable to introduce pulse modulation technique in laser resonator intracavitary to obtain arteries and veins
Rush column vector laser.Therefore, a kind of method for how realizing low-loss, high efficiency, all -fiber and low cost is steady to obtain pulse
Fixed, mode purity height, compact-sized pulsed column vector optical fiber laser are of great significance.
Invention content
The purpose of this utility model is exactly to propose a kind of pulsed column arrow to solve the above-mentioned problems in the prior art
Measure optical fiber laser.
The purpose of this utility model will be achieved by the following technical programs：Pulse of the kind based on model selection coupler
Column vector optical fiber laser, including pumping source, wavelength division multiplexer, gain fibre, the first Polarization Controller, circulator, semiconductor
Saturable absorbing mirror, the second Polarization Controller, model selection coupler and third Polarization Controller pass through light between each device
The mode of fibre coupling constitutes a fiber resonance cavity, and the output end of the pumping source is connected with the short wavelength end of wavelength division multiplexer,
The output end of wavelength division multiplexer passes sequentially through gain fibre, the first Polarization Controller is connected with the first port of circulator, annular
The second port of device connects a semiconductor saturable absorbing mirror, and the third port of circulator passes sequentially through the second Polarization Control
Device, model selection coupler are connected with the long wavelength end of wavelength division multiplexer constitutes annular chamber, and third Polarization Controller is connected to mould
Formula selects the less fundamental mode optical fibre output end of coupler.
Preferably, it is additionally provided with coupler between the circulator and the second Polarization Controller, the of the coupler
Single port is connected with the third port of circulator, and second port is connected with one end of the second Polarization Controller.
Preferably, the light that the pumping source is sent out is coupled into gain fibre by wavelength division multiplexer, and gain fibre puts light
Greatly, which enters the first port of circulator by the first polarization resonator, is exported from the second port of circulator to half
There is saturable absorption effect continuous light is become pulsed light simultaneously for conductor saturable absorbing mirror, the semiconductor saturable absorbing mirror
Be reflected into laser resonator intracavitary, from the third port of circulator export, third port output light through the second Polarization Controller into
Enter model selection coupler, when light is by model selection coupler, single mode optical fiber output end exports LP01 moulds to wavelength division multiplexer
Long wavelength's input port, for intracavitary generate resonance, less fundamental mode optical fibre output port export LP11 moulds, by adjust second partially
Shake controller and third Polarization Controller, and realization accurately controls the polarization state of mould field, is obtained in output end ring-shaped distributed
Column vector laser.
Preferably, the rear of the third Polarization Controller is provided with collimating lens, and the rear of the collimation lens is set
Be equipped with a feldspar mineral, the light of the output end output of the third Polarization Controller after collimation lens collimates again by
Feldspar mineral measures corresponding light spot image.
Preferably, after realizing mode-lock operation by adjusting the first Polarization Controller, shaping modes select coupler both sides
The second Polarization Controller and third Polarization Controller, can be radial in less fundamental mode optical fibre output end respectively obtains column vector laser
Polarised light and angularly polarized light.
Preferably, the gain fibre is Yb dosed optical fiber or Er-doped fiber, and the Yb dosed optical fiber corresponds to 1 micron waveband,
The Er-doped fiber corresponds to 1550 micron wavebands.
Preferably, mode locking is carried out to the saturable absorption effect of light using semiconductor saturable absorbing mirror, when adjusting first
When Polarization Controller, ultra-short pulse laser will be exported in optical fiber laser output end.
The advantages of technical solutions of the utility model, is mainly reflected in：All devices of the optical fiber laser are all made of all -fiber
Coupled modes, it is compact-sized, do not interfered by extraneous factor, can continuous-stable work, and utilize semiconductor saturable absorbing mirror
Mode locking is carried out to the saturable absorption effect of light, a stable pulsed column vector laser, and the optical fiber laser can be generated
The model selection coupler used has loss small, and mode purity is high, prepares the advantages that simple so that pulsed column vector laser has
There are higher mode purity, lower loss and higher slope efficiency.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of pulsed column vector optical fiber laser of the utility model.
Fig. 2 is the structural schematic diagram of the utility model model selection coupler.
Fig. 3 is the LP11 moulds in the LP01 moulds and two mode fibers in the utility model single mode optical fiber under 1.064 mum wavelengths
Pattern effective refractive index with fibre diameter change curve.
Fig. 4 is the utility model Mode Coupling process simulation figure, (a) and is (b) the LP01 moulds and two moulds in single mode optical fiber
LP11 moulds are the basic mode in single mode optical fiber into two mode fibers in coupled zone power cycle interchange graph, (c)-(f) in optical fiber
The Dynamic Graph of high-order mode conversion.
Fig. 5 is the mould field at different wavelengths point of two mode fiber output ends of the utility model model selection coupler
Cloth is tested by CCD and is obtained.
Fig. 6 is two output end transmitted spectrums of the utility model model selection coupler.
Fig. 7 is the experimental result of pulsed column vector optical fiber laser of the utility model based on model selection coupler, (a)
For the spectrum of pulsed column vector optical fiber laser；(b) it is the output time-domain oscillogram of pulsed column vector optical fiber laser.
Fig. 8 is the experiment test knot of pulsed column vector optical fiber laser of the utility model based on model selection coupler
Fruit, (a) are the radio spectrum of pulsed column vector optical fiber laser；(b) it is the output power of pulsed column vector optical fiber laser
Slope curve.
Fig. 9 be the utility model CCD detection obtain column vector mode of laser spot figure and add the polarizer after mode of laser spot
Figure；Wherein, (a) is angular polarization optical mode spot, annular in shape to be distributed, (b), (c), (d), (e) be the output of angular polarization laser plus
Enter polarizing film and change the polarized light field distribution obtained after polarizing film optical axis direction, be (f) radial polarisation optical mode spot, light field is in ring
Shape is distributed, (g), (h), (i), (j) be that radial polarisation laser is added polarizing film and is obtained after changing polarizing film optical axis direction
Polarized light field is distributed.
Specific implementation mode
The purpose of this utility model, advantage and feature will carry out figure by the non-limitative illustration of preferred embodiment below
Show and explains.These embodiments are only the prominent examples using technical solutions of the utility model, all to take equivalent replacement or wait
Effect transformation and formed technical solution, all fall within the requires of the utility model protection within the scope of.
The utility model discloses a kind of pulsed column vector optical fiber laser, as shown in Figure 1, multiple including pumping source 1, wavelength-division
With device 2, gain fibre 3, the first Polarization Controller 4, circulator 5, semiconductor saturable absorbing mirror 6, the second Polarization Controller 7,
It is humorous to constitute an optical fiber between each device by way of fiber coupling for model selection coupler 8 and third Polarization Controller 9
Shake chamber.The output end of the pumping source is connected with the short wavelength end of wavelength division multiplexer, and the output end of wavelength division multiplexer passes sequentially through
Gain fibre, the first Polarization Controller are connected with the first port 51 of circulator, the connection of second port 52 one and half of circulator
The third port 53 of conductor saturable absorbing mirror, circulator passes sequentially through the second Polarization Controller, model selection coupler and wave
The long wavelength end of division multiplexer, which is connected, constitutes annular chamber, and third Polarization Controller is connected to the less fundamental mode optical fibre of model selection coupler
Output end.
Coupler 12, the first port of the coupler are additionally provided between the circulator and the second Polarization Controller
It is connected with the third port of circulator, second port is connected with one end of the second Polarization Controller.All devices of laser are equal
It is compact-sized using all -fiber coupled modes, do not interfered by extraneous factor, can continuous-stable work, and using semiconductor can
Saturated absorption mirror carries out mode locking to the saturable absorption effect of light, can generate a stable pulsed column vector laser.
The model selection coupler can selectively export different patterns in different fiber-optic outputs, have mould
Formula is converted and two functions of model selection.The model selection coupler may be implemented from the basic mode LP01 in single mode optical fiber to less
High-order mode LP11 conversions in mode fiber, and basic mode is exported in single mode optical fiber output end, it is exported in less fundamental mode optical fibre output end high
Rank mould.The model selection coupler is made by a kind of method of novel no prestretching fused biconical taper, has loss small, pattern is pure
Degree is high, prepares the advantages that simple so that pulsed column vector laser has a higher mode purity, lower loss and it is higher tiltedly
Rate efficiency.
Specifically, the light that the pumping source is sent out is coupled into gain fibre by wavelength division multiplexer, and gain fibre puts light
Greatly, which enters the first port of circulator by the first polarization resonator, is exported from the second port of circulator to half
Continuous light is become pulsed light and is reflected into laser resonant cavity by conductor saturable absorbing mirror, the semiconductor saturable absorbing mirror
It is interior, it is exported from the third port of circulator, third port output light selects coupler, light through the second Polarization Controller Dietary behavior
When by model selection coupler, single mode optical fiber output end exports LP01 moulds to long wavelength's input port of wavelength division multiplexer, uses
In generating resonance in intracavitary, less fundamental mode optical fibre output port exports LP11 moulds, is polarized by adjusting the second Polarization Controller and third
Controller, realization accurately control the polarization state of mould field, and ring-shaped distributed column vector laser is obtained in output end.
The rear of the third Polarization Controller is provided with collimating lens 10, and the rear of the collimation lens is provided with one
Feldspar mineral 11, the feldspar mineral are referred to as CCD, charge coupled device, and the third is inclined
Shake controller output end output light corresponding light spot image is measured by CCD again after collimation lens collimates.The gain
Optical fiber is Yb dosed optical fiber or Er-doped fiber, and the Yb dosed optical fiber corresponds to 1 micron waveband, and it is micro- that the Er-doped fiber corresponds to 1550
VHF band, in the present embodiment, the gain fibre are preferably Yb dosed optical fiber.
Mode locking is carried out to the saturable absorption effect of light using semiconductor saturable absorbing mirror, when adjusting the first Polarization Control
When device realizes the PGC demodulation to light, ultra-short pulse laser can will be exported in optical fiber laser output end.When by adjusting the
After one Polarization Controller realizes mode-lock operation, shaping modes select the second Polarization Controller and the third polarization control on coupler both sides
Device processed, can in less fundamental mode optical fibre output end respectively obtains column vector laser radial polarisation light and angularly polarized light.
Fig. 2 is the structural schematic diagram of model selection coupler, and operation principle is as follows：
According to coupled mode theory and coupling mode equations:
In formula, z indicates the distance of coupling, β1And β2Swashed in LP01 patterns and less fundamental mode optical fibre respectively in single mode optical fiber
The propagation constant of a certain pattern risen；C is the coefficient of coup；If β2It is the propagation constant of LP11 patterns in less fundamental mode optical fibre, works as phase
Position mismatches Δ β=β1-β2When being 0, this shows the high-order mode (LP11) in basic mode (LP01) and less fundamental mode optical fibre in single mode optical fiber
Meet phase-matching condition.Under phase-matching condition, equation 1 and 2 can be reduced to：P1(z)=cos2(Cz) and P2(z)=
sin2(Cz), show that two patterns carry out periodic Power Exchange, realize LP01 moulds and converted to the pattern of LP11 moulds.And
LP01 moulds are exported in single mode optical fiber output end, LP11 moulds are exported in less fundamental mode optical fibre output end, by different fiber-optic outputs
Selectivity exports different patterns, realizes the function of modal cutoff.
Because the propagation constant of pattern changes with the diameter of optical fiber, in order to make LP01 moulds and few mould light in single mode optical fiber
LP11 moulds meet phase-matching condition in fibre.The LP01 moulds and less fundamental mode optical fibre in single mode optical fiber are calculated using FInite Element (BPM)
In LP11 moulds propagation constant under 1.06 mum wavelengths with fibre diameter variation relation, as shown in figure 3, as can be seen from the figure
But meet phase-matching condition when 22.4 μm of single mode optical fiber and less fundamental mode optical fibre diameter having the same.
It is illustrated in figure 4 and is based on beam propagation method (BPM), utilize the optical fiber for the realization phase matched that Rsoft emulation obtains
The analogous diagram that diameter parameters carry out the LP01 moulds of simulation calculation acquisition and LP11 mould power cycle sexual intercourses are changed.Utilize fused biconical taper method
Directly single mode optical fiber and less fundamental mode optical fibre are put into draw and carries out fused biconical taper processing in cone machine, it is straight when single mode optical fiber and less fundamental mode optical fibre
Diameter be 22.4 μm when can preparation mode select coupler because single mode optical fiber and less fundamental mode optical fibre diameter having the same, are not necessarily to
Single mode optical fiber or less fundamental mode optical fibre first pre-stretching processing could be met into phase-matching condition using traditional method, seen using CCD
Survey the mould spot near 1 μm of less fundamental mode optical fibre output end.The high-order mold of the model selection coupler less fundamental mode optical fibre output end
There are higher mode purity and lower insertion loss, as shown in figure 5, it is defeated to obtain model selection coupler less fundamental mode optical fibre through measurement
The purity of the high-order mode (LP11) of outlet is 96% or more, and the loss of model selection coupler is in 0.5dB or less.
Spontaneous radiation light source is inputted in the single mode optical fiber input terminal of model selection coupler, single mode optical fiber is measured respectively and lacks
The transmission spectrum of mode fiber output end is as shown in Figure 6.In order to make model selection coupler not protected from environmental and stable work,
Model selection coupler is packaged processing.
It is illustrated in figure 7 the pulsed column vector optical fiber laser experimental result based on model selection coupler, wherein figure (a)
For the output spectrum of laser, three dB bandwidth 1.5nm, centre wavelength 1042.3nm, side mode suppression ratio 31dB.(b) it is arteries and veins
The output time-domain oscillogram of column vector optical fiber laser is rushed, the repetition rate of pulse is 18.58MHz.
It is illustrated in figure 8 the pulsed column vector optical fiber laser experimental result based on model selection coupler, wherein figure (a)
It is composed for the RF analysis of pulsed column vector optical fiber laser, as can be seen from the figure repetition rate is 18.58MHz, in 0.6MHz
Bandwidth in, signal-to-noise ratio is up to 50dB.Figure (b) is the curve that laser exports that the mean power of pulse changes with pump power
Figure.The slope efficiency that experiment test obtains single mode laser fiber-optic output is 5.7%, the slope efficiency of less fundamental mode optical fibre output end
It is 4.2%.
Fig. 9 show the column vector mode of laser spot figure of CCD detection acquisition and adds the mode of laser spot figure after the polarizer：Its
In, (a) is angular polarization optical mode spot, annular in shape to be distributed, (b), (c), (d), (e) be that polarization is added in the output of angular polarization laser
Piece simultaneously changes the polarized light field distribution obtained after polarizing film optical axis direction, is (f) radial polarisation optical mode spot, light field is annularly divided
Cloth, (g), (h), (i), (j) be that radial polarisation laser is added polarizing film and changes the polarization obtained after polarizing film optical axis direction
Optical field distribution.Test result shows that the polarization purity of obtained column vector beam is more than 96%.
The utility model carries out mode-lock operation using semiconductor saturable absorbing mirror, and the pulsed column vector laser of generation is more steady
It is fixed, and it is not necessarily to any active pulse-modulator part, it is simple in structure, it is insensitive to change of cavity length, it can be achieved that self-starting and stabilization
Mode locking.The utility model combines semiconductor saturable absorbing mirror and model selection coupler, is incited somebody to action in the output end of laser
The pulsed column vector laser high and efficient to a pulse stabilization, mode purity.
Still there are many embodiment, all technologies formed using equivalents or equivalent transformation for the utility model
Scheme is all fallen within the scope of protection of the utility model.
Claims (6)
1. a kind of pulsed column vector optical fiber laser based on model selection coupler, it is characterised in that：Including pumping source, wavelength-division
Multiplexer, gain fibre, the first Polarization Controller, circulator, semiconductor saturable absorbing mirror, the second Polarization Controller, pattern
Coupler and third Polarization Controller are selected, a fiber resonance cavity is constituted by way of fiber coupling between each device,
The output end of the pumping source is connected with the short wavelength end of wavelength division multiplexer, and the output end of wavelength division multiplexer passes sequentially through gain light
Fine, the first Polarization Controller is connected with the first port of circulator, and the second port of circulator connects a semiconductor saturable
Absorbing mirror, the third port of circulator pass sequentially through the length of the second Polarization Controller, model selection coupler and wavelength division multiplexer
Wavelength end, which is connected, constitutes annular chamber, and third Polarization Controller is connected to the less fundamental mode optical fibre output end of model selection coupler.
2. a kind of pulsed column vector optical fiber laser based on model selection coupler according to claim 1, feature
It is：Coupler, the first port and ring of the coupler are additionally provided between the circulator and the second Polarization Controller
The third port of shape device is connected, and second port is connected with one end of the second Polarization Controller.
3. a kind of pulsed column vector optical fiber laser based on model selection coupler according to claim 1, feature
It is：The light that the pumping source is sent out is coupled into gain fibre by wavelength division multiplexer, and gain fibre is by light amplification, the continuous light
The first port for entering circulator by the first polarization resonator, exports to semiconductor saturable from the second port of circulator and inhales
Mirror is received, there is the semiconductor saturable absorbing mirror saturable absorption effect continuous light is become pulsed light and is reflected into laser
It in resonant cavity, is exported from the third port of circulator, third port output light selects coupling through the second Polarization Controller Dietary behavior
Clutch, when light is by model selection coupler, the long wavelength that single mode optical fiber output end exports LP01 moulds to wavelength division multiplexer inputs
Port, for generating resonance in intracavitary, less fundamental mode optical fibre output port exports LP11 moulds, by adjusting the second Polarization Controller and the
Three Polarization Controllers, realization accurately control the polarization state of mould field, and ring-shaped distributed column vector laser is obtained in output end.
4. a kind of pulsed column vector optical fiber laser based on model selection coupler according to claim 1, feature
It is：The rear of the third Polarization Controller is provided with collimating lens, and the rear of the collimation lens is provided with a charge
The light of coupled detector, the output end output of the third Polarization Controller is visited by Charged Couple again after collimation lens collimates
It surveys device and measures corresponding light spot image.
5. a kind of pulsed column vector optical fiber laser based on model selection coupler according to claim 1, feature
It is：After realizing mode-lock operation by adjusting the first Polarization Controller, shaping modes select second polarization on coupler both sides
Controller and third Polarization Controller, radial polarisation light in less fundamental mode optical fibre output end respectively obtains column vector laser and angular
Polarised light.
6. a kind of pulsed column vector optical fiber laser based on model selection coupler according to claim 1, feature
It is：The gain fibre is Yb dosed optical fiber or Er-doped fiber, and the Yb dosed optical fiber corresponds to 1 micron waveband, the er-doped light
Fibre corresponds to 1550 micron wavebands.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111198446A (en) * | 2020-01-23 | 2020-05-26 | 北京邮电大学 | All-fiber first-order cylindrical vector mode generator, system and method |
| CN111404007A (en) * | 2020-03-27 | 2020-07-10 | 西北大学 | Synchronous mode-locking dual-wavelength fiber laser |
-
2018
- 2018-03-13 CN CN201820344775.4U patent/CN207884064U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111198446A (en) * | 2020-01-23 | 2020-05-26 | 北京邮电大学 | All-fiber first-order cylindrical vector mode generator, system and method |
| CN111404007A (en) * | 2020-03-27 | 2020-07-10 | 西北大学 | Synchronous mode-locking dual-wavelength fiber laser |
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Address after: 226000 Room 8319, Building 11, Happy New Town, Gangzha District, Nantong City, Jiangsu Province Co-patentee after: Nanjing University of Posts and Telecommunications Nantong Institute Limited Patentee after: Nanjing Post & Telecommunication Univ. Address before: 210003 new model road 66, Gulou District, Nanjing, Jiangsu Co-patentee before: Nanjing University of Posts and Telecommunications Nantong Institute Limited Patentee before: Nanjing Post & Telecommunication Univ. |