CN106959487A - The Active Optical Fiber long-period gratings suppressed for stimulated Raman scattering and its making - Google Patents
The Active Optical Fiber long-period gratings suppressed for stimulated Raman scattering and its making Download PDFInfo
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- CN106959487A CN106959487A CN201710342747.9A CN201710342747A CN106959487A CN 106959487 A CN106959487 A CN 106959487A CN 201710342747 A CN201710342747 A CN 201710342747A CN 106959487 A CN106959487 A CN 106959487A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02152—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating involving moving the fibre or a manufacturing element, stretching of the fibre
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Abstract
The invention discloses a kind of Active Optical Fiber long-period gratings suppressed for pulse laser stimulated Raman scattering and preparation method thereof, the long-period gratings are made based on Active Optical Fiber by way of cone is drawn in pointwise, and no less than one long-period gratings of cascade on the Active Optical Fiber, it is used to pulse laser on the Active Optical Fiber after cascaded long-period grating amplify, the decay compared with before cascade of output general power is less than 1dB after pulse laser amplification, and Raman optical power down is more than 15dB.The present invention makes long-period gratings on the Active Optical Fiber by directly amplifying end in high power pulsed laser, in the case where not increasing fusion point and system complexity, effectively suppresses stimulated Raman scattering, and reduction loss improves level of integrated system.
Description
Technical field
It is more particularly to a kind of to be used for pulse laser stimulated Raman scattering the present invention relates to pulse optical fiber and amplifier
Active Optical Fiber long-period gratings of suppression and preparation method thereof.
Background technology
Compared with conventional laser, optical fiber laser is as new laser, with high conversion efficiency, small volume, light beam
The advantage such as quality is good.Especially fiber pulse laser, wherein ultrashort pulse laser are in fiber optic communication, Fibre Optical Sensor, industry
Process, the field such as biomedicine has important application.It especially can be achieved on the Yb dosed optical fiber pulse laser of high-power output
Due to its small volume, high cost, the advantages of easily realizing high power makes it have very big application in industrial process applications
Potentiality.But it is due to that power is higher when amplifying to pulse laser, pulsewidth is shorter, the peak power of pulse laser is also higher,
Its nonlinear effect is more obvious.Wherein because the pulsed laser power loss that stimulated Raman scattering is caused turns into restriction high power
One key factor of pulse laser development.
, can be by increasing fibre core covering ratio, so as to reduce nonlinear effect, so as to suppress to be excited in the case of general
To mention this method in the generation of Raman scattering, such as patent CN104300344A.But suppressed by increasing fibre diameter
Stimulated Raman scattering, can cause the beam quality of laser to decline.Press down by using as long-period gratings as bandstop filter
The generation of stimulated Raman scattering processed, in existing document " Suppression of stimulated Raman scattering
Mentioned in employing long period gratings in double-clad fiber amplifiers ".This method
By at the amplification end of high power pulsed laser arteries and veins, the multiple long-period gratings of welding suppress non-linear in the middle of Active Optical Fiber
Stimulated Raman scattering caused by effect.But it is due to that the long-period gratings that this method is used are inscribed in passive doubly clad optical fiber
On, multiple fusion points can be increased to amplification end and increase laser loss, meanwhile, the extra device of addition also increases whole pulse and swashed
The complexity of light device system.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, Active Optical Fiber long period light is based on the invention provides one kind
The method that the pulse laser stimulated Raman scattering of grid suppresses, its object is to directly amplify having for end in high power pulsed laser
Long-period gratings are made on the optical fiber of source, in the case where not increasing fusion point and system complexity, effectively suppress excited Raman
Scattering, reduction loss, improves level of integrated system, thus solves prior art and passes through the multiple long periods of welding in the middle of Active Optical Fiber
Grating can increase amplification end multiple fusion points increase laser loss to suppress stimulated Raman scattering, meanwhile, add extra device
Part also increases the technical problem of the complexity of whole pulsed laser system.
The Active Optical Fiber long-period gratings of the present invention make and using must adhere to two principles：1st, in pulse laser
Amplifying end should be suppressed using the cascade of multiple long-period gratings to excited Raman, rather than simple simple in amplification end optical fiber connector
Using it is macrocyclic filter effect 2, the long-period gratings that make on Active Optical Fiber should not be to total output work after laser amplifier
Rate is caused compared with lossy.
To achieve the above object, it is used to pulse laser excited Raman there is provided one kind according to one aspect of the present invention dissipate
The Active Optical Fiber long-period gratings of suppression are penetrated, the long-period gratings are made based on Active Optical Fiber, and on the Active Optical Fiber
No less than one long-period gratings of cascade, the long-period gratings lowest-order resonance peak wavelength amplifies end with pulse laser
The consistent wavelength of the Raman diffused light excited.
Preferably, it is used to pulse laser on the Active Optical Fiber after cascaded long-period grating amplify, after pulse laser amplification
Export general power decay compared with before cascade and be less than 1dB, Raman optical power down is more than 15dB.
According to another aspect of the present invention, there is provided a kind of active light suppressed for pulse laser stimulated Raman scattering
The preparation method of fine long-period gratings, cascaded long-period grating is made by way of cone is drawn in pointwise on Active Optical Fiber.
Preferably, described preparation method, it comprises the following steps：
(1) wavelength of stimulated Raman scattering light is found：Spectral measurement is carried out to the amplifier section of former pulse laser, it is determined that
The wavelength of stimulated Raman scattering light, and record under different amplifying powers, corresponding stimlated Raman spectrum；
(2) long-period gratings are made on Active Optical Fiber：One is made on Active Optical Fiber by way of cone is drawn in pointwise
Long-period gratings；The length of the Active Optical Fiber is identical with the length of the former pulse laser amplifier section；
(3) cycle of long-period gratings is adjusted：In the cycle of long-period gratings described in set-up procedure (2), make the long week
The lowest-order resonance wavelength of phase grating and the consistent wavelength of step (1) the stimulated Raman scattering light；
(4) cascaded long-period grating：On the Active Optical Fiber cascade-connection long period light is made according to the method for step (2)
Grid.
Preferably, step (2) includes following sub-step：
(2-1) is in one section of single mode wire jumper of each welding in two ends of the Active Optical Fiber, one end wire jumper access band light source, one end
Wire jumper accesses spectrometer；
(2-2) divests step (2-1) described Active Optical Fiber the fixture that carbon dioxide laser is put into after coating, cleaning
In, clamp and keep exceptionally straight state, laser parameter is set, select an experience cycle of long-period gratings, start laser
Pointwise is carried out to the Active Optical Fiber draws cone to make long-period gratings.
Preferably, wideband light source described in step (2-1) is super continuum source.
Preferably, step (2-2) is expanded using lens to the laser facula of the laser.
Preferably, step (2-2) uses spectroscope and speculum, is two beams by single beam laser beam splitting, the optical fiber is added
Heat.
Preferably, the specific method in the cycle of the long-period gratings described in step (3) set-up procedure (2) is：If
The resonance wavelength of step (2) described long-period gratings appears in the corresponding shortwave direction of wavelength of the stimulated Raman scattering light,
Then increase the cycle of the long-period gratings；Otherwise then reduce the cycle, test of many times is until the stimulated Raman scattering light
The consistent wavelength of wavelength and the lowest-order resonance peak of the long-period gratings；Preferably, while making its of the long-period gratings
Its resonance peak avoids the pump light of the former pulse laser amplifier section and two wave bands of pulse laser.
Preferably, the long-period gratings after making are coated with, and are put into fixed tool and keep exceptionally straight state.
Preferably, low-refraction coating is used when being coated with described in carrying out.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect.
1 present invention is due to being that long period optical fiber is directly made on former Active Optical Fiber so that whole Optical Maser System is simple
Change, integrated level is higher, it is long not increase extra fusion point, so that insertion loss is greatly reduced.
2 general suppression Raman scatterings are, using the bigger Active Optical Fiber of core diameter, to reduce nonlinear scattering, so as to suppress Raman
The generation of scattering, but core diameter is bigger, the zlasing mode of support is more, so as to cause the beam quality for exporting laser to deteriorate.This
Method is used can realize that Raman suppresses with the smaller optical fiber of core diameter, it is to avoid the beam quality that big core diameter Active Optical Fiber is caused deteriorates.
3 simply simply filter relative to general wave filter in amplification end end, and with energy loss, the present invention is using more
Individual long-period gratings cascade, suppresses the generation of Raman scattering, it is to avoid the Raman diffused light of generation participates in later stage amplification, with smaller
Energy loss.
Brief description of the drawings
Fig. 1 makes schematic diagram for the Active Optical Fiber long-period gratings of the embodiment of the present invention 1；
Fig. 2 is the Active Optical Fiber long-period gratings schematic diagram that the embodiment of the present invention 1 makes；
Fig. 3 amplifies for the Active Optical Fiber long-period gratings of the embodiment of the present invention 1 for pulse laser；
Fig. 4 is the Active Optical Fiber long-period gratings spectrogram of the embodiment of the present invention 1；
Fig. 5 (a) amplifies laser and raman scattering spectrum for the long-period gratings not made using the embodiment of the present invention 1；Fig. 5
(b) it is using Raman scatter suppression figure after the long-period gratings.
Wherein, the left motors of 1-；2- carbon dioxide laser fiber clamps；3- goes to coat yb-doped double-clad fiber；4- length week
Phase grating；5- carbon dioxide lasers；The right motors of 6-；7- coated portions again；8- long-period gratings fix tool；9- grandfather tapes are coated
Yb-doped double-clad fiber；10- pulse lasers amplifier section pumping source；11- pulse laser seed fractions；12- bundling devices；
13- cascaded long-period gratings；14- is carved with the yb-doped double-clad fiber of long-period gratings.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
The present invention on same section of Active Optical Fiber by directly making multiple long-period gratings, and each long-period gratings have
Certain interval.When the Active Optical Fiber for being carved with long-period gratings is used for into the amplification end of pulse laser, due to pulse laser
With higher peak power, it is easy to produce stimulated Raman scattering, but the ripple of the stimulated Raman scattering light in amplification process
Length is consistent with the resonance wavelength of long-period gratings, and its energy can be coupled in covering by fibre core, and the limitation loss of covering laser
Much larger than fibre core, the energy can be lost rapidly, it is impossible in the amplification for participating in the later stage.Due to being adopted on whole section of Active Optical Fiber
Cascaded, stimulated Raman scattering is suppressed layer by layer, so that the generation for the Raman scattering being greatly lowered with multiple long-period gratings.
Simultaneously because long-period gratings do not produce loss at the corresponding wavelength of pulse laser, therefore the output of laser light is not produced
Raw influence.
The long-period gratings that the present invention makes are applied to the suppression of small core diameter Active Optical Fiber pulse laser stimulated Raman scattering.
A kind of preparation method for Active Optical Fiber long-period gratings suppressed for pulse laser excited Raman that the present invention is provided, including with
Lower step：
(1) wavelength at excited Raman peak is found：Because various lasers seed fraction output wavelength is different, amplifying fiber class
Type is also different, needs accurately to determine the corresponding wave band of its stimulated Raman scattering during early stage.Therefore former laser is put
It is most of to carry out spectral measurement, determine the accurate wavelength of Raman diffused light.And record under different amplifying powers, it is corresponding to be excited to draw
Graceful spectrum.
(2) long-period gratings are made on Active Optical Fiber：One is made on Active Optical Fiber by way of cone is drawn in pointwise
Long-period gratings；The length of the Active Optical Fiber is identical with the length of the former pulse laser amplifier section.
Because most of Active Optical Fiber fibre core does not mix germanium, it is impossible to inscribe grating, therefore this patent using Ultra-Violet Laser
Illustrate that pointwise is carried out to Active Optical Fiber using carbon dioxide laser draws the mode of cone to make long-period gratings emphatically.One is used first
Section amplifies end identical Active Optical Fiber with pulse laser, in one section of single mode wire jumper of each welding in its two ends.One end wire jumper access is wide
Band light source, one end wire jumper access spectrometer, the change of spectrum during can so being inscribed with real-time monitored grating.By this section of active light
Fibre divests coating, is cleaned using alcohol, is put into the fixture of carbon dioxide laser, clamps and keeps exceptionally straight state.Set and swash
Light device parameter, selectes an experience cycle of long-period gratings, such as 500 μm, starts laser and pointwise drawing cone is carried out to optical fiber
Long-period gratings are made, now spectrally loss peak occurs in a certain specific band.After long-period gratings making terminates, remove
Grating simultaneously keeps exceptionally straight state, and records its corresponding wavelength, the long-period gratings resonance wavelength now made be not necessarily by
Raman scattering is swashed to wavelength.
(3) cycle of long-period gratings is adjusted：Long period resonance wavelength and the cycle set are searched out for step (2),
If the wavelength appears in the corresponding shortwave direction of Raman peaks wavelength, increase the cycle；If the wavelength appears in Raman spike
Long corresponding long wave direction, then reduce after cycle, test of many times until Raman peaks corresponding wavelength and long-period gratings resonance wavelength
When completely the same, that is, obtain optimal period and record.
(4) Active Optical Fiber cascades multiple long-period gratings and encapsulated：Choose and amplify end equal length with pulse laser
Active Optical Fiber, inscribes a long-period gratings every a segment distance on Active Optical Fiber using the method for step (2), often inscribes one
After individual long-period gratings, it is cleaned again and coated again, be put into mould and fix and keep exceptionally straight state, then carve
Write next grating.
(5) Raman scattering inhibition is tested：Former laser amplification is replaced using the Active Optical Fiber for being carved with long-period gratings
The Active Optical Fiber at end, the laser spectrum tested under different pump powers, and compared with the spectrum recorded before, draw test effect
Really.
Preferably, the wideband light source used in the step (2) uses super continuum source, is easy in broader scope
Determine the wavelength location of long-period gratings.
Preferably, long period light is made using using the larger carbon dioxide laser of laser facula in the step (2)
Grid, or laser facula is expanded using lens, it is to avoid less hot spot is produced to optical fiber because energy density is too high and etched
Effect, destroys optical fiber structure so that the pump light leakage at amplification end or laser loss.Further, using spectroscope and
Speculum, is two beams by single beam laser beam splitting, optical fiber is heated from both direction, power density is further reduced, reduce simultaneously
The polarization dependence of long-period gratings after making.
Preferably, in the step (3) generally, the long-period gratings made on Active Optical Fiber can inspire many
Individual resonance peak, when which part resonance peak is located at pumping wavelength, can cause absorption of the Active Optical Fiber to pump light to reduce, so as to drop
Low laser delivery efficiency.It is same when there is resonance peak laser output wavelength to be located at Output of laser wavelength, can cause unnecessary defeated
Go out laser loss.Therefore should be by optimization cycle, while making other resonance peaks of the long-period gratings avoid the former pulse
The pump light of laser amplifier section and the two of pulse laser wave bands.In such as example, described in Fig. 4, in 1064nm pulse lasers
This method is used in device, pumping source wavelength is 976nm, and output laser is 1064nm, and it is attached that stimulated Raman scattering light is located at 1120nm
Closely, lowest-order resonance peak correspondence Raman peak position (when lowest-order resonance peak corresponding wavelength is 1120nm) is now used, it is remaining
Resonance peak is respectively positioned on long wavelength part, substantially avoid pumping source wavelength and optical maser wavelength.
In preferably described step (4), when coating again, it should try one's best using low-refraction coating, because high index of refraction is applied
Material can make it that the resonance peak of long-period gratings disappears or weakened.
It is embodiment below：
Embodiment 1
The invention provides it is a kind of for pulse laser stimulated Raman scattering suppress Active Optical Fiber long-period gratings and its
Preparation method.The preparation method schematic diagram of long-period gratings is as shown in figure 1, obtained long-period gratings are as shown in Fig. 2 will be active
Long-period fiber grating is used for pulse laser and amplified as shown in figure 3, long-period gratings spectrum is as shown in figure 4, stimulated Raman scattering
It is as shown in Figure 5 by long period inhibition.
Preparation method is comprised the following steps that：
(1) wavelength of stimulated Raman scattering light is found：Spectral measurement is carried out to the amplifier section of former pulse laser, it is determined that
The wavelength of stimulated Raman scattering light, and record under different amplifying powers, shown in corresponding stimlated Raman spectrum, such as Fig. 5 (a).
Former laser is 1064nm pulse lasers, and wherein amplifier section uses Double Cladding Ytterbium Doped Fiber.To its laser
It can be tested, determine that the Yb dosed optical fiber optimum length that its amplifier section is used is 8m, the position that Raman peaks occur is in 1120nm
Near.
(2) long-period gratings are made on Active Optical Fiber：First is made on Active Optical Fiber by way of cone is drawn in pointwise
Individual long-period gratings.
As shown in figure 1, taking the same model yb-doped double-clad fiber that length is 8m.Wherein one section optical fiber is divested and coated
To going to coat yb-doped double-clad fiber 3, coated length is divested for 4cm, using washes of absolute alcohol.Carbon dioxide is placed on to swash
On light device fiber clamp 2, two fixtures were beforehand with collimation, so as to ensure that optical fiber is in its straight state during cone is drawn.Two
After carbon oxide laser beam splitting, two beam carbon dioxide lasers 5 are in 160 degree, and each spot size is about 0.3mm, two-beam spot power
It is 9W altogether.Laser and parameters of hydraulic motor are set, are divided into two stages：First stage, laser thang-kng softens optical fiber, same with this
When the left motor 1 of parameters of hydraulic motor be moved to the left 400 μm, right motor 6 is remained stationary as, and such optical fiber is drawn out a conelet；Second-order
Section, carbon dioxide laser is stopped, but left motor 1 and right motor 6 are moved to the left 100 μm simultaneously, so just obtains long week
The a cycle of phase grating.Repeat first stage and second stage 40 times, just can obtain desired long-period gratings 4.The length
It is 500 μm that periodic optical grating 4, which has the interval cycle size between 40 cycles, i.e. two cones, and the long-period gratings 4 are minimum
The corresponding wavelength of rank resonance peak is 1125nm, slightly larger than stimulated Raman scattering wavelength.
(3) cycle of long-period gratings is adjusted：In the cycle of long-period gratings 4 described in set-up procedure (2), make the long week
The lowest-order resonance wavelength of phase grating 4 and the consistent wavelength of step (1) the stimulated Raman scattering light；By test of many times, really
When the settled cycle is 480 μm, lowest-order resonance peak wavelength is 1120 μm, and the transmitted spectrum of the long-period gratings is as shown in Figure 3.Should
Long-period gratings have 4 resonance peaks of generation altogether, wherein the resonance peak positioned at 1120nm just coincide with stimulated scattering Raman peaks, position
In 1120nm, three dB bandwidth is more than 10nm, and extinction ratio is more than 5dB, and remaining resonance peak is respectively positioned on long wave direction, will not be to laser
Influence is produced with pump light.
(4) cascaded long-period grating：According to the preparation method of step (2), the cycle determined with step (3) is in same type
One long-period gratings of each making at yb-doped double-clad fiber 6m, 4m, 2m, each long-period gratings cycle is 480 μm, then right
3 long-period gratings made are cleaned, and carrying out coating again using low-refraction coating obtains coated portion 7 again, protects
Protect optical fiber not contaminated.Again coated portion 7 and grandfather tape coating yb-doped double-clad fiber 9 are compared, and diameter is identical, and by grating
It is partially disposed in the long-period gratings designed for this to fix in tool 8, keeps grating to be in exceptionally straight state.
(5) using step (3), (4), the optical fiber generation of yb-doped double-clad fiber 14 for being carved with long-period gratings after (5) processing
Former laser amplifier section is accessed for former yb-doped double-clad fiber.The average work(of the output pulse laser of pulse laser seed fraction 11
Rate is 2.2W, and peak power is 1.83kW, repetition rate 40MHz, pulsewidth 30ps.976nm multimode semiconductor lasers are used as arteries and veins
Laser amplifier section pumping source 10 is rushed, the output end of bundling device 12 melts with being carved with the yb-doped double-clad fiber 14 of long-period gratings
Connect, the other end of yb-doped double-clad fiber 14 for being carved with long-period gratings cuts 8 degree of angles and prevents that reflected light from breaking pumping source, by 3
The cascaded long-period grating 13 that long-period gratings 4 are constituted is used for the suppression of Raman scattering.
Fig. 5 is represented before and after addition long-period gratings, under identical pump power, and Raman suppresses situation.It can be seen that in pump
When Pu power reaches highest, it is 5.27W that former laser Maximum Power Output during long-period gratings is not added with Fig. 5 (a), is added
Plus lengthen after periodic optical grating, Maximum Power Output is 4.48W, and 0.7dB or so is lost in laser power after it with the addition of grating.Addition
Before long-period gratings, Raman scattering power is 15dB with laser power difference.After Fig. 5 (b) addition long-period gratings, Raman scattering
Power is 35dB with laser power difference, and stimulated Raman scattering light luminous power reduces 20dB, and Raman inhibition is obvious.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, any modification, equivalent and the improvement made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of Active Optical Fiber long-period gratings suppressed for pulse laser stimulated Raman scattering, it is characterised in that the length
Periodic optical grating is made based on Active Optical Fiber, and no less than one long-period gratings of cascade on the Active Optical Fiber, described
Long-period gratings lowest-order resonance peak wavelength amplifies the consistent wavelength for the Raman diffused light that end is excited with pulse laser.
2. long-period gratings as claimed in claim 1, it is characterised in that used on the Active Optical Fiber after cascaded long-period grating
It is less than 1dB, Raman optical power down in output general power decay compared with before cascade after pulse laser amplification, pulse laser amplification
More than 15dB.
3. a kind of preparation method of the long-period gratings of the Active Optical Fiber suppressed for pulse laser stimulated Raman scattering, its feature
It is that cascaded long-period grating is made on Active Optical Fiber by way of cone is drawn in pointwise.
4. preparation method as claimed in claim 3, it is characterised in that it comprises the following steps：
(1) wavelength of stimulated Raman scattering light is found：Spectral measurement is carried out to the amplifier section of former pulse laser, it is determined that being excited
The wavelength of Raman diffused light, and record under different amplifying powers, corresponding stimlated Raman spectrum；
(2) long-period gratings are made on Active Optical Fiber：A long week is made on Active Optical Fiber by way of cone is drawn in pointwise
Phase grating；The length of the Active Optical Fiber is identical with the length of the former pulse laser amplifier section；
(3) cycle of long-period gratings is adjusted：In the cycle of long-period gratings described in set-up procedure (2), make the long period light
The lowest-order resonance wavelength of grid and the consistent wavelength of step (1) the stimulated Raman scattering light；
(4) cascaded long-period grating：On the Active Optical Fiber cascaded long-period grating is made according to the method for step (2).
5. preparation method as claimed in claim 4, it is characterised in that step (2) includes following sub-step：
(2-1) is in one section of single mode wire jumper of each welding in two ends of the Active Optical Fiber, one end wire jumper access band light source, one end wire jumper
Access spectrometer；
(2-2) is put into the fixture of carbon dioxide laser after step (2-1) described Active Optical Fiber is divested into coating, cleaning, folder
It is tight and keep exceptionally straight state, laser parameter is set, an experience cycle of long-period gratings is selected, starts laser to described
Active Optical Fiber carries out pointwise and draws cone to make long-period gratings.
6. preparation method as claimed in claim 5, it is characterised in that wideband light source described in step (2-1) is super continuous spectrums
Light source.
7. preparation method as claimed in claim 5, it is characterised in that step (2-2) is swashed using lens to the laser
Light hot spot is expanded.
8. preparation method as claimed in claim 5, it is characterised in that step (2-2) uses spectroscope and speculum, by single beam
Laser beam splitter is two beams, and the optical fiber is heated.
9. preparation method as claimed in claim 4, it is characterised in that the long period described in step (3) set-up procedure (2)
The specific method in the cycle of grating is：If the resonance wavelength of step (2) described long-period gratings appears in the excited Raman
The corresponding shortwave direction of wavelength of scattered light, then increase the cycle of the long-period gratings；Otherwise then reduce the cycle, repeatedly examination
Test until the consistent wavelength of the wavelength and the lowest-order resonance peak of the long-period gratings of the stimulated Raman scattering light；It is preferred that
Ground, while making other resonance peaks of the long-period gratings avoid pump light and the pulse of the former pulse laser amplifier section
Two wave bands of laser.
10. method as claimed in claim 3, it is characterised in that the long-period gratings after making are coated with, and are put into
Fix and exceptionally straight state is kept in tool, be preferred to use low-refraction coating when being coated with described in progress.
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Cited By (6)
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| CN107632336A (en) * | 2017-09-04 | 2018-01-26 | 华中科技大学 | A kind of long-period gratings and preparation method thereof |
| CN109038205A (en) * | 2018-07-10 | 2018-12-18 | 南京理工大学 | A kind of method of stimulated Raman scattering phenomenon in inhibition optical fiber laser |
| CN109149329A (en) * | 2018-08-28 | 2019-01-04 | 南京理工大学 | Stimulated Raman scattering filter production method in kilowatt level optical fiber laser |
| CN111856645A (en) * | 2020-07-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Fused-cone type long-period fiber grating, preparation device, preparation method and laser system |
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| CN111856645A (en) * | 2020-07-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Fused-cone type long-period fiber grating, preparation device, preparation method and laser system |
| CN111856645B (en) * | 2020-07-28 | 2023-09-19 | 中国人民解放军国防科技大学 | Fused taper type long-period fiber grating, preparation device, preparation method and laser system |
| CN113916831A (en) * | 2021-11-15 | 2022-01-11 | 西安邮电大学 | CO based on micro-conical long-period grating2Gas concentration detection method |
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