CN109004503A - High peak power dissipation soliton resonance mode-locked laser - Google Patents
High peak power dissipation soliton resonance mode-locked laser Download PDFInfo
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- 239000000835 fiber Substances 0.000 claims abstract description 119
- 230000010287 polarization Effects 0.000 claims abstract description 40
- 239000013307 optical fiber Substances 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims description 71
- 230000008878 coupling Effects 0.000 claims description 29
- 238000010168 coupling process Methods 0.000 claims description 29
- 238000005859 coupling reaction Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000003447 ipsilateral effect Effects 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 11
- 230000009021 linear effect Effects 0.000 description 8
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 239000004038 photonic crystal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
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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
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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
- H01S3/06708—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
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Abstract
The invention discloses a high peak power dissipation soliton resonance mode-locked laser, and aims to provide a laser capable of outputting high peak power pulses with a magnitude of thousands of watts without an amplifier. The fiber bragg grating polarization-independent isolator comprises 2 pump light sources, 2 beam combiners, 2 gain fibers, a filter, a polarization-independent isolator and a polarization controller, wherein a first pump source, a pump input arm of the first beam combiner, the first gain fiber, an input arm a of a first coupler, an output arm b of the first coupler, the filter, an input arm b1 of a second coupler, an output arm a1 of the second coupler, the polarization-independent isolator and a signal input arm of the first beam combiner are connected to form a one-way ring; an output arm c of the first coupler, which is on the opposite side of the input arm a, is connected with the second beam combiner, the second gain fiber, the polarization controller and an output arm d of the first coupler, which is on the same side of the output arm c, to form a nonlinear amplification ring mirror. The optical fiber of the invention has small length, and can boost the power to thousands of watts without an amplifier.
Description
Technical field
It resonates mode-locked laser the present invention relates to a kind of dissipative solitons, in particular to one kind does not need amplifier and directly generates
The dissipative solitons resonance mode-locked laser of thousands of watts of magnitude peak powers.
Background technique
Super continuum source has many advantages, such as that spectral width, brightness are high and spatial coherence is good simultaneously, thus optical measurement,
Molecular Spectroscopy, biomedical imaging and optical bio tissue ablation etc. have a wide range of applications, and are grinding for light source field
Study carefully one of hot spot.Currently, super continuous spectrums mainly carry out non-linear broadening by the way that pulse laser to be input in photonic crystal fiber
Mode obtain.The pulse laser performance of pulse optical fiber output is determined by its mode locking mechanism.According to intracavitary pulse
Evolution mode is classified, and mainly has traditional orphan's mode locking, Dispersion-Managed Soliton mode locking and three kinds of dissipative solitons mode locking.
Since in the dispersion of laser, non-linear, gain and these important parameters can be lost substantially in dissipative solitons mode locking
When degree variation, still maintain stable, it is more extensive than traditional orphan's mode locking, Dispersion-Managed Soliton mode locking application, it is current mode locking light
The important research direction in fibre laser field.Dissipative solitons resonance (Dissipative Soliton Resonance, referred to as
DSR) mode locking belongs to one kind of dissipative solitons mode locking.Theoretical and experiment shows that in the laser the generation of DSR pulse is a kind of
It is that four kinds of non-linear, dispersion, gain and loss effects balance each other as a result, when it is intracavitary reach saturated absorption when be able to achieve the peak of output
It is unrelated with pump power to be worth power, and is determined by the intracavitary attainable equilibrium state of institute.So generating the mode-locked laser of DSR pulse
Device is more stable than other kinds of mode-locked laser peak power, can be from the unstability bring shadow of pump power
It rings, strong antijamming capability.Because of the direct phase of degree and pulse peak power of super continuous spectrums non-linear broadening in the photonic crystal
It closes, so the DSR pulse of high-peak power is also beneficial to generate spectral region greatly and the super continuous spectrums of time-domain stability.
But the output pulse power of existing DSR mode-locked laser is not high enough.As on November 15th, 2016 is published in OPTICS
" the 10 μ J dissipative soliton resonance square pulse in a dual amplifier of LETTERS
Figure-of-eight double-clad Er:Yb mode-locked fiber laser " (utilizes double pumping action splayed knot
The ytterbium erbium of structure is co-doped with mode locked fiber laser and generates 10 μ J DSR pulses, referred to as background technique 1, and laser structure is shown in attached drawing
1) it, is made of two rings (line style ring and non-linear loop), linear loop is unrelated by the first ytterbium erbium co-doped double-clad amplifier 13, polarization
Isolator 6, the second coupler 5, the first transmission fiber 15, the second Polarization Controller 12, the input arm a of the first coupler 7 and defeated
Arm b is formed out.The connection of first ytterbium erbium co-doped double-clad amplifier, 13 output end polarizes the input terminal of unrelated isolator 6, polarizes nothing
The output end for closing isolator 6 connects the input arm b1 of the second coupler 5, and the output arm c1 of the second coupler 5 is entire laser
Output end, 15 one end of the first transmission fiber of output arm a1 connection of the second coupler 5, the other end of the first transmission fiber 15 connects
The input terminal of the second Polarization Controller 12 is connect, the output end of the second Polarization Controller 12 connects the input terminal a of the first coupler 7,
13 input terminal of output end b connection the first ytterbium erbium co-doped double-clad amplifier of first coupler 7.Non-linear loop is by the first coupler
7 output arm c, unrelated isolator 11, the second ytterbium erbium co-doped double-clad amplifier 14, the first transmission fiber 16, the first coupling are polarized
The output arm d of clutch 7 is formed.The output arm c connection of first coupler 7 polarizes the input terminal of unrelated isolator 11, polarizes unrelated
11 output end of isolator connects 14 input terminal of the second ytterbium erbium co-doped double-clad amplifier, the second ytterbium erbium co-doped double-clad amplifier 14
Output end connect one end of the second transmission fiber 16, the other end of the second transmission fiber 16 connects the output of the first coupler 7
Arm d.The length of first transmission fiber 15 and the second transmission fiber 16 is 1000m and 500m respectively, and the total chamber length of laser (refers to institute
Have the total length of optical fiber) it is 1536m；The coupling ratio of second coupler 5 be 1:99 (i.e. the output light ratio of output arm a1 be 1%,
99%) the output light ratio of output arm c1 is；The coupling ratio of first coupler 7 is 30:70 (the i.e. output light ratio of output arm c
It is 70%, 30%) the output light ratio of output arm d is；The DSR pulse peak power maximum that laser generates only has 120W.Again
As on November 15th, 2017 is published in " the 1.1-kW Peak-Power of IEEE PHOTONICS TECHNOLOGY LETTERS
Dissipative Soliton Resonance in a Mode-Locked Yb-Fiber Laser " (generates 1.1kW peak value
Power mixes ytterbium DSR mode-locked laser, referred to as background technique 2, and output peak power is shown in attached drawing 2), it is to be using core diameter
The pulse output of highest 1.1kW peak power also only can be achieved in the laser that 10 μm of optical fiber is built, this is reported at present
The tidemark of DSR mode-locked laser output peak power.
Therefore, existing DSR laser is also needed to the pump light source as super continuous spectrums by single-stage or multistage amplification
Device carries out power amplification, and the laser pulse peaks power for exporting it reaches thousands of watts of magnitudes.Amplifier build process is related to respectively
Between kind device and the welding between device and optical fiber, relatively complicated and cost are very high；And using pumping amplification seed pulse
The mode of laser is limited to the utilization rate of pump light source, and common light-light efficiency is only 60% or so, and electrical-optical efficiency is only
50% or so, there are biggish energy losses；According to required value of magnification, also need to change the device and optical fiber parameter in amplifier,
So that it is matched with amplifying power, otherwise amplification generate high peak power pulse process be easy to cause the light in amplifier every
Breakdown from device and optical fiber etc. is burnt, and modifying amplifier is also a cumbersome job, to user's profession of laser
It is more demanding, it is difficult to popularity.
Therefore, how to solve disadvantages mentioned above is the technical issues of this field researcher extremely pays close attention to.
Summary of the invention
The technical problem to be solved by the present invention is to propose a kind of high-peak power for the shortcoming of existing DSR laser
Dissipative solitons resonance mode-locked laser can directly reach the high peak power pulse output of thousands of watts of magnitudes without amplifier.
The technical scheme adopted by the invention is that: the present invention by the first pumping source, the first bundling device, the first gain fibre,
Filter, the second coupler, the unrelated isolator of polarization, the first coupler, the second pumping source, the second bundling device, the second gain light
Fine, Polarization Controller composition, each device connects in the following order forms two loops:
First pumping source output terminal is connected to the pumping input arm of the first bundling device by passive fiber, the first bundling device
The output end of signal input arm isolator unrelated with polarization is connected by passive fiber, the signal output arm connection of the first bundling device
First gain fibre one end.The first gain fibre other end connect the first coupler input arm a, the first coupler with input
Arm a ipsilateral output arm b connects the input terminal of filter by passive fiber, and the output end of filter is connected by passive fiber
The output arm a1 of the input arm b1 of second coupler, the second coupler other side polarize unrelated isolator by passive fiber connection
Input terminal, the second coupler output arm d1 ipsilateral with input arm b1 is hanging, the second coupler with ipsilateral defeated of output arm a1
Arm c1 (output arm that output arm c1 is the output light of entire laser) output laser pulse out.Polarize the defeated of unrelated isolator
Outlet connects the signal input arm of the first bundling device.First pumping source, the pumping input arm of the first bundling device, the first gain light
Fibre, the input arm a of the first coupler, the output arm b of the first coupler, filter, the input arm b1 of the second coupler, the second coupling
The output arm a1 of clutch, the unrelated isolator of polarization, the first bundling device signal input arm connect to form first closed loop, claim
For unidirectional ring.
First coupler with the output arm c of input arm a heteropleural and the second bundling device, the second gain fibre, Polarization Control
The output arm d ipsilateral with output arm c of device and the first coupler connect to form second loop.The output arm c of first coupler
The signal input arm of the second bundling device is connected by passive fiber, while the output end of the second pumping source is connected by passive fiber
The signal output arm of the pumping input arm of second bundling device, bundling device connects second gain fibre one end, the second gain fibre
The other end connects Polarization Controller, and Polarization Controller connects the output arm d of the first coupler by passive fiber.Second loop
Referred to as nonlinear amplified loop mirror (Nonlinear Amplifying Loop Mirror, referred to as NALM) is to realize laser
The structure of device mode locking.(above-mentioned device is connected by the tail optical fiber of each device, when tail optical fiber length is inadequate, with model of the same race
Passive fiber increases length.)
First pumping source and the second pumping source central wavelength can be any in 915nm, 920nm, 940nm, 960nm, 976nm
The maximum power of one kind, output is more than or equal to 16W.The central wavelength of first pumping source and the second pumping source both can be identical,
Can be different, output power is also both can be identical, can also be different.First pumping source pump light is transferred to first by pumping arm
Pump light is transferred to the second bundling device by pumping arm by bundling device, the second pumping source.
First bundling device and the second bundling device are cladding pumping bundling device, the center of signal input arm and signal output arm
Wavelength is 1030nm.The central wavelength of the pumping input arm of first bundling device is equal with the central wavelength of the first pumping source, the
The central wavelength of two bundling devices is equal with the central wavelength of the second pumping source.First bundling device will be from the received pump of the first pumping source
Pu light and conjunction beam is carried out from unrelated isolator received signal light is polarized, the mixed light after beam will be closed and be coupled into the first gain light
It is fine.Second bundling device will carry out conjunction beam from the received pump light of the second pumping source and from the first coupler received signal light, will
Mixed light after closing beam is coupled into the second gain fibre.
First gain fibre and the second gain fibre are Double Cladding Ytterbium Doped Fiber of the same race, are emulated and tested discovery, first
It is 1.5m-3m that gain fibre and the second gain fibre, which meet length, and core diameter is identical and is all larger than 10 μm, covering numerical aperture
It is identical and be more than or equal to 0.46,1095nm absorption coefficient be less than 15dB/km, 915nm absorption coefficient be less than 1.6dB/km, 976nm
When absorption coefficient is less than 4.8dB/km, amplification effect is best.The length of first gain fibre and the second gain fibre and absorption system
Number may be the same or different, and meet above range.First gain fibre receives mixed light from the first bundling device,
First excitation signal light under the action of wherein pump light, then signal light is further amplified.Second gain fibre closes beam from second
Mixed light is received in device, first excitation signal light further amplifies under the action of wherein pump light.
The central wavelength of filter is identical as the central wavelength of signal input arm of the first bundling device, is 1030nm, bandwidth
For 14-30nm.Filter carries out bandpass filtering to from the first coupler received signal light, by flashlight centre wavelength
The signal of (1030nm) nearby is sent to the second coupler.
The central wavelength for polarizing unrelated isolator is identical as the central wavelength of filter, is 1030nm, receives from the second coupling
The clockwise direction signal light of clutch output arm a1 transmission, the counter clockwise direction optical isolation to transmitting from the first bundling device are protected
Demonstrate,prove one-way transmission of the signal light in unidirectional ring.
First coupler, the central wavelength of the second coupler are identical as the central wavelength for polarizing unrelated isolator, are
The coupling ratio range of 1030nm, output arm d, c of the first coupler is 30:70~45:65, (such as: if the first coupler
Coupling ratio is 30:70, i.e., from input arm a input light when, the output light ratio of output arm d and output arm c are respectively 30% He
70%).First coupler connects unidirectional ring and NALM, and the signal light inputted from unidirectional ring a arm is divided according to coupling ratio to two
Arm c, d carry out transmitted in both directions clockwise and anticlockwise, passive part (c, d including the first coupler of NALM in NALM
Arm, the signal arm and output arm of the second bundling device and the passive fiber of connection) the long range of ring be 1m-4m.First coupling
The peak power of the long DSR pulse for determining final mode locking of device, the coupling ratio of the second coupler and NALM ring.It is exported from NALM
Signal light returns unidirectional ring by the output arm b of the first coupler, and after filter filtering, large scale signal light (presses second
The coupling ratio of coupler) from the output arm c1 of the second coupler output (such as: the coupling of output arm a1, c1 of the second coupler
When than for 1:99, then the output light ratio of output arm c1 is 99%, and the output light ratio of output arm a1 is 1%) the second coupler
Output arm a1, c1 coupling ratio range be 1:99~10:90.
Polarization Controller is mounted on from the passive fiber that the second gain fibre transmits out, to the signal light transmitted in optical fiber
Apply stress, adjustment signal light polarization state is realized pulse mode-locked.
Passive fiber and other device (the first pumping source, the second pumping source, the first bundling device, the second bundling device, filtering
Device, the second coupler, the first coupler, the unrelated isolator of polarization) tail optical fiber be all made of the double clad passive fiber of model of the same race,
And core diameter is greater than 10 μm, it is desirable that identical as the first gain fibre and the second gain fibre core diameter.
The method that the present invention generates high peak power pulse laser is:
First pumping source generates pump light, and pump light is sent to the first bundling device, and the first bundling device is by coupling pump light
Into the first gain fibre, the first gain fibre carries out stimulated radiation amplification to the pump light come is coupled into, and inspires signal light simultaneously
Amplification, the first coupler enter to from the first gain fibre received signal light by two output arms c, d according to coupling ratio
NALM carries out (by the arm c of the first coupler along the second bundling device to the second gain fibre, then arriving connection clockwise in NALM
The output arm d) of Polarization Controller and the first coupler and counterclockwise (by the first coupler output arm d along Polarization Controller to
Second gain fibre, then the output arm c) transmitted in both directions to the second bundling device and the first coupler.Second pumping source generates pumping
Pump light is sent to the second bundling device by light, and the second bundling device is by coupling pump light into the second gain fibre, the second gain fibre
So that the signal in NALM is further amplified.Polarization Controller applies Stress relief signal light polarization to passive fiber.It is suitable
Hour hands and the signal light of transmitted in both directions counterclockwise pass through the output of the first coupler after being amplified and interacted in NALM
Arm b returns unidirectional ring, obtains mode-locked signal, and filter carries out bandpass filtering to mode-locked signal, filters out central wavelength
The mode-locked signal of (1030nm) nearby, the second coupler are divided the mode-locked signal received from filter according to coupling ratio,
The arm a1 connection of second coupler polarizes unrelated isolator, and signal light is passed to recycle in loop and is amplified.Polarize unrelated isolator
The reversed light (counterclockwise) in the first bundling device is filtered, the light of the output arm a1 of the second coupler is received, guarantees signal light in list
One-way transmission into ring.
Loss of the invention is mainly provided by filter, dispersion and non-linear by each section of fiber lengths and NOLM first
The coupling ratio of coupler influences, and gain size is controlled by the length of the first gain fibre and the second gain fibre.The present invention without
The tail optical fiber of source optical fiber, gain fibre and each component is all made of the bigger doubly clad optical fiber of mode field area, can be effectively reduced non-
Linear effect realizes under conditions of rationally changing filter bandwidht and the parameters such as fiber lengths and coupler coupling ratio
New non-linear, dispersion, gain and loss balance, can theoretically obtain bigger energy and higher peak power.Pass through
It is reasonable that multimode is inhibited to generate (being bent intracavitary passive fiber and gain fibre), the energy of single mode can be made significantly to be promoted,
Simulation result is consistent with theory expectation.Due to effectively inhibiting DSR pulse division to concentrate pulse energy using filter,
Fiber lengths are reduced simultaneously, further promote high-peak power DSR pulse shaping using heavy caliber optical fiber.
Using the present invention can achieve it is following the utility model has the advantages that
1, the present invention is not necessarily to amplifier, and power ascension is directly eliminated amplifier to thousands of watts of magnitudes, reduces pumping
The waste of energy of light source.
2, the optical fiber total length that the present invention uses is only 20m-30m, and the optical fiber for substantially reducing laser-like structure is long
Degree, easy to operate, save the cost.
3, for the present invention using the unrelated isolator of polarization and doubly clad optical fiber that can bear high-peak power, mould field is big, changes
The parameters such as pump power and intracavitary fiber lengths can realize change pulse peak power, burn after generating stable pulse
A possibility that very little, safety is good.
Detailed description of the invention
Fig. 1 is the structure chart of double pumping action laser in background technique 1.
Fig. 2 is the relational graph of laser output maximum peak power and pump power in background technique 2.
Fig. 3 is general structure schematic diagram of the present invention.
Fig. 4 is the output pulse analogous diagram of the specific embodiment of the invention.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
Fig. 1 is the structural schematic diagram of double pumping action laser in background technique 1.
Fig. 2 is the relational graph of maximum peak power shown in background technique 2 and pump power, and abscissa indicates pumping function
Rate, ordinate indicate corresponding output pulse power value under different pump powers.It can be seen from the figure that pump power is in 4W-
When 8W changes, peak power is basically stable at 1.1kW.
Fig. 3 is structural schematic diagram of the invention.By the first pumping source 1, the first bundling device 2, the first gain fibre 3, filtering
Device 4, the second coupler 5, the unrelated isolator 6 of polarization, the first coupler 7, the second pumping source 8, the second bundling device 9, the second gain
Optical fiber 10, Polarization Controller 11 form, and each device connects in the following order forms two loops:
First pumping source, 1 output end is connected to the pumping input arm of the first bundling device 2, the first bundling device by passive fiber
The output end of 2 signal input arm isolator 6 unrelated with polarization is connected by passive fiber, the signal output of the first bundling device 2
Arm connects 3 one end of the first gain fibre.First gain fibre, 3 other end connects the input arm a of the first coupler 7, the first coupling
Device 7 connect the input terminal of filter 4 with input arm a ipsilateral output arm b by passive fiber, and the output end of filter 4 passes through
Passive fiber connects the input arm b1 of the second coupler 5, and the output arm a1 of 5 other side of the second coupler is connected by passive fiber
Polarize unrelated 6 input terminal of isolator, the second coupler 5 output arm d1 ipsilateral with input arm b1 is hanging, by the second coupler 5 with
Output arm a1 ipsilateral output arm c1 output laser pulse.The output end for polarizing unrelated isolator 6 connects the first bundling device 2
Signal input arm.First pumping source 1, the pumping input arm of the first bundling device 2, the first gain fibre 3, the first coupler 7 it is defeated
Enter the output arm of arm a, the output arm b of the first coupler 7, filter 4, the input arm b1 of the second coupler 5, the second coupler 5
A1, the unrelated isolator 6 of polarization, the first bundling device 2 signal input arm connect to form first closed loop, referred to as unidirectional ring.
First coupler 7 with the output arm c of input arm a heteropleural and the second bundling device 9, the second gain fibre 10, polarization
The output arm d ipsilateral with output arm c of controller 11 and the first coupler 7 connect to form second loop.First coupler 7
Output arm c connects the signal input arm of the second bundling device 9 by passive fiber, while the output end of the second pumping source 8 passes through nothing
Source optical fiber connects the pumping input arm of the second bundling device 9, and the signal output arm of bundling device 9 connects 10 one end of the second gain fibre,
The other end of second gain fibre 10 connects Polarization Controller 11, and Polarization Controller 11 connects the first coupler by passive fiber
7 output arm d.Second loop is known as nonlinear amplified loop mirror (Nonlinear Amplifying Loop Mirror, letter
Referred to as NALM), it is the structure for realizing Mode-locking For Lasers.(above-mentioned device is connected by the tail optical fiber of each device, when tail optical fiber length
When inadequate, increase length with the passive fiber of model of the same race.)
A high-peak power DSR laser has been built according to Fig. 3 by University of Science and Technology for National Defence, and 1 central wavelength of the first pumping source is
976nm, maximum power output 25W；Second pumping source, 8 central wavelength is 976nm, maximum power output 16W；First bundling device 2
Central wavelength with the pumping input arm of the second bundling device 9 is 976nm, and the central wavelength of signal input arm is 1030nm；First
25 μm of core diameter of gain fibre 3 and the second gain fibre 10, cladding diameter are 250 μm, and length is 2m；Filter 4
Bandwidth 30nm, central wavelength 1030nm；The coupling ratio of output arm d, c of first coupler 7 are 30:70；The long 4m of NOLM ring；Second
The coupling ratio of output arm a1, c1 of coupler 5 are 10:90,90% output.Fixing 8 power of the second pumping source is 5W.In the condition
It is lower to be emulated with high-peak power dissipative solitons resonance mode-locked laser of the business mathematics software MATLAB to design, by pulse
Light field in discrete assembly model according to given modular construction sequential delivery, abscissa table in obtained result such as Fig. 4, Fig. 4
Show that output pulse temporal width, ordinate indicate the pulse power value of output, synteny does not indicate the different pumpings of the first pumping source 1
Pulse temporal and peak power situation under power.From fig. 4, it can be seen that the pump power of the first pumping source 1 increases to from 10W
During 20W, under the pump power greater than 14W, laser output peak power is stably held in 12kW or more, with background skill
Art Fig. 2, under 4-8W pump power, peak power highest 1.1kW compares, and improves ten times and has a surplus.The optical fiber that the present invention uses
It is thicker, need bigger power (to be greater than 8W, the absorption in 4-8W in gain fibre is also not up to saturated, and cannot form stabilization
DSR laser pulse) could excite DSR pulse, but the present invention has compared to the peak power of background technique and is substantially improved.
Claims (8)
- The mode-locked laser 1. a kind of high-peak power dissipative solitons resonate, it includes the second coupler (5), the unrelated isolator of polarization (6), the first coupler (7), it is characterised in that high-peak power dissipative solitons resonance mode-locked laser further includes the first pumping source (1), the first bundling device (2), the first gain fibre (3), filter (4), the second pumping source (8), the second bundling device (9), second Gain fibre (10), Polarization Controller (11), each device connects in the following order forms two loops:First pumping source (1) output end is connected to the pumping input arm of the first bundling device (2), the first bundling device by passive fiber (2) output end of signal input arm isolator (6) unrelated with polarization is connected by passive fiber, the letter of the first bundling device (2) Number output arm connects the first gain fibre (3) one end；First gain fibre (3) other end connects the input of the first coupler (7) Arm a, the output arm b ipsilateral with input arm a of the first coupler (7) connect the input terminal of filter (4) by passive fiber, filter The output end of wave device (4) connects the input arm b1 of the second coupler (5) by passive fiber, the second coupler (5) other side Output arm a1 polarizes unrelated isolator (6) input terminal by passive fiber connection, and the second coupler (5) and input arm b1 are ipsilateral Output arm d1 is hanging, and the output arm c1 ipsilateral with output arm a1 of the second coupler (5) is entire high-peak power dissipative solitons The output arm of resonance mode-locked laser；Polarize the signal input of the output end connection the first bundling device (2) of unrelated isolator (6) Arm；First pumping source (1), the pumping input arm of the first bundling device (2), the first gain fibre (3), the first coupler (7) it is defeated Enter arm a, the output arm b of the first coupler (7), filter (4), the input arm b1 of the second coupler (5), the second coupler (5) Output arm a1, the unrelated isolator (6) of polarization, the first bundling device (2) signal input arm connect to form first closed loop, Referred to as unidirectional ring；First coupler (7) with the output arm c and the second bundling device (9) of input arm a heteropleural, the second gain fibre (10), partially The output arm d ipsilateral with output arm c of vibration controller (11) and the first coupler (7) connect to form second loop；First coupling The output arm c of clutch (7) is by the signal input arm of passive fiber connection the second bundling device (9), while the second pumping source (8) Pumping input arm of the output end by passive fiber connection the second bundling device (9), the signal output arm connection of the second bundling device (9) The other end of the second gain fibre (10) one end, the second gain fibre (10) connects Polarization Controller (11), Polarization Controller (11) pass through the output arm d of passive fiber connection the first coupler (7)；Second loop is known as nonlinear amplified loop mirror NALM is the structure for realizing Mode-locking For Lasers；Above-mentioned device is connected by the tail optical fiber of each device, when tail optical fiber length is inadequate When, increase length with the passive fiber of model of the same race；First pumping source (1) pump light is transferred to the first bundling device (2) by pumping arm, and the second pumping source (8) leads to pump light It crosses pumping arm and is transferred to the second bundling device (9)；First bundling device (2) and the second bundling device (9) are cladding pumping bundling device, the pumping input arm of the first bundling device (2) Central wavelength it is equal with the central wavelength of the first pumping source (1), the central wavelength of the second bundling device (9) and the second pumping source (8) central wavelength is equal；First bundling device (2) will be from the received pump light of the first pumping source (1) and from polarizing unrelated isolation Device (6) received signal light carries out conjunction beam, and the mixed light after conjunction beam is coupled into the first gain fibre (3)；Second bundling device (9) Conjunction beam will be carried out from the received pump light of the second pumping source (8) and from the first coupler (7) received signal light, after closing beam Mixed light is coupled into the second gain fibre (10)；First gain fibre (3) and the second gain fibre (10) are Double Cladding Ytterbium Doped Fiber of the same race, and core diameter is identical and big In 10 μm；First gain fibre (3) receives mixed light from the first bundling device (2), first excites under the action of wherein pump light Signal light, then signal light is further amplified；Second gain fibre (10) receives mixed light from the second bundling device (9), at it First excitation signal light further amplifies under the action of middle pump light；Filter (4) central wavelength is identical as the central wavelength of signal input arm of the first bundling device (2), filter (4) to from First coupler (7) received signal light carries out bandpass filtering, and the signal near flashlight centre wavelength is sent to the second coupling Clutch (5)；The central wavelength for polarizing unrelated isolator (6) is identical as filter (4) central wavelength, receives defeated from the second coupler (5) The clockwise direction signal light of arm a1 transmission, the counter clockwise direction optical isolation to transmitting from the first bundling device (2) guarantee letter out Number one-way transmission of the light in unidirectional ring；First coupler (7), the central wavelength of the second coupler (5) are identical as the central wavelength for polarizing unrelated isolator (6), the One coupler (7) connects unidirectional ring and NALM, and the signal light inputted from unidirectional ring a arm is divided according to coupling ratio to two arms c, d, Transmitted in both directions clockwise and anticlockwise is carried out in NALM；The signal light exported from NALM passes through the output of the first coupler (7) Arm b returns unidirectional ring, by filter (4) filter after, signal light by the second coupler (5) coupling ratio in large scale part from The output arm c1 of second coupler (5) is exported；Polarization Controller (11) is mounted on from the passive fiber that the second gain fibre (10) transmits out, to the letter transmitted in optical fiber Number light applies stress, and adjustment signal light polarization state is realized pulse mode-locked；Passive fiber and the first pumping source (1), the second pumping source (8), the first bundling device (2), the second bundling device (9), filter (4), the second coupler (5), the first coupler (7), the tail optical fiber for polarizing unrelated isolator (6) are all made of the double clad of model of the same race Passive fiber, and fibre core is identical as the first gain fibre (3) and the second gain fibre (10) core diameter.
- The mode-locked laser 2. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that first pump Pu source (1) and the second pumping source (8) central wavelength are any one in 915nm, 920nm, 940nm, 960nm, 976nm, output Maximum power be more than or equal to 16W；The central wavelength of first pumping source (1) and the second pumping source (8) both can be identical, can also be with Difference, output power is also both can be identical, can also be different.
- The mode-locked laser 3. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that described first closes The central wavelength of the signal input arm and output arm of beam device (2) and the second bundling device (9) is 1030nm.
- The mode-locked laser 4. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that described first increases Beneficial optical fiber (3) and the second gain fibre (10) length are 1.5m-3m, and covering numerical aperture is identical and more than or equal to 0.46, 1095nm absorption coefficient is less than 15dB/km, and 915nm absorption coefficient is less than 1.6dB/km, and 976nm absorption coefficient is less than 4.8dB/ km；The length and absorption coefficient of first gain fibre (3) and the second gain fibre (10) may be the same or different.
- The mode-locked laser 5. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that the filter (4) central wavelength is 1030nm, bandwidth 14-30nm.
- The mode-locked laser 6. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that the polarization nothing The central wavelength for closing isolator (6) is 1030nm.
- The mode-locked laser 7. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that first coupling Clutch (7), the central wavelength of the second coupler (5) are 1030nm, the coupling ratio range of output arm d, c of the first coupler (7) For 30:70~45:65, the coupling ratio range of output arm a1, c1 of the second coupler (5) are 1:99~10:90.
- The mode-locked laser 8. high-peak power dissipative solitons as described in claim 1 resonate, it is characterised in that the NALM's The a length of 1m-4m of passive part ring, the passive part include c, d arm of the first coupler (7), the signal of the second bundling device (9) Arm and output arm and the passive fiber of connection.
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