CN105161968B - A kind of middle infrared double-wave length based on graphene is the same as repetition pulse optical fiber - Google Patents
A kind of middle infrared double-wave length based on graphene is the same as repetition pulse optical fiber Download PDFInfo
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- CN105161968B CN105161968B CN201510605881.4A CN201510605881A CN105161968B CN 105161968 B CN105161968 B CN 105161968B CN 201510605881 A CN201510605881 A CN 201510605881A CN 105161968 B CN105161968 B CN 105161968B
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Abstract
The invention discloses a kind of middle infrared double-wave length based on graphene with repetition pulse optical fiber, belong to pulse optical fiber field.A kind of middle infrared double-wave length based on graphene of the present invention is the same as repetition pulse optical fiber, speculum including being covered with graphene film layer, the speculum same level position is equipped with dichroic mirror one, the dichroic mirror one tilts 45 ° of arrangements relative to horizontal direction, relatively parallel dichroic mirror two is equipped with directly over the dichroic mirror one, the top of dichroic mirror two is double-wavelength pulse output terminal；Planoconvex lens four is equipped between the dichroic mirror one and speculum, light beam can be focused to speculum by the planoconvex lens four；The dichroic mirror one is in 3 μm of optical cavities, and the dichroic mirror two is in 2 μm of optical cavities, and two dichroic mirror has direction guiding effect at the same time to 2 μm and 3 μm of light.The present invention is ingenious in design, and infrared double-wave length for conventional method, has simple in structure, small volume, low, easy to operate, the advantage being easily integrated is lost with repetition high-power laser pulse in can obtaining.
Description
Technical field
The present invention relates to a kind of pulse optical fiber, particularly a kind of same repetition of middle infrared double-wave length based on graphene
Pulse optical fiber.
Background technology
Optical fiber laser have high conversion efficiency, small, output beam quality is excellent, laser threshold is low, be easily integrated,
The advantages that good heat dissipation effect, dual wavelength fibre laser are defined according to Output of laser wavelength number of channels, it is in orphan
Pulses generation, difference interference ranging, light sensing, microwave radio signal and high-repetition-rate ultra-short pulse generation research in conduct
Primary light source, pulsed infrared laser has broad application prospects in national defence, military affairs, medical treatment, communication etc. in 2-5 μm, such as
Hydrone has very strong absworption peak in 2 μm and 3 mu m wavebands, can be used for laser surgey of new generation, blood is condensed rapidly, hand
The art surface of a wound is small, hemostatic good etc..
The middle infrared pulse optical-fiber laser of currently available technology, which is concentrated mainly on, realizes unicast long pulse, it is impossible to meets actual
Demand, and conventional method middle infrared double-wave length laser pulse relatively difficult to achieve.Led in the prior art by actively Q-switched and actively Q-switched
Draw gain modulation mode realize in infrared double wave long pulse export, structure is excessively complicated so that optical fiber laser loses solid
Have it is compact flexibly, small volume the advantages that.
The content of the invention
The goal of the invention of the present invention is：For above-mentioned problem, there is provided one kind utilizes graphene saturable absorption
Characteristic, the passive Q-adjusted stabilization for realizing 2 μm and 3 μm are exported with repetition dual wavelength Q impulse, simple in structure, small volume, loss
Low, easy to operate, the middle infrared double-wave length being easily integrated is the same as repetition pulse optical fiber.
The technical solution adopted by the present invention is as follows：
Infrared double-wave length comprises the following steps with the method for repetition pulse in a kind of transmitting of the present invention：
Step 1：Pumping source two is opened, the 1150nm light that pumping source two is launched focuses to holmium-spectrum by planoconvex lens one and is co-doped with
On the film plating layer of the input terminal of ZBLAN optical fiber, the output terminal output that 3 μm of light are co-doped with ZBLAN optical fiber from holmium-spectrum, 3 μm of light warps are produced
Cross the collimation of planoconvex lens three to travel on dichroic mirror one, 3 μm of light pass through dichroic mirror one, and are transmitted through planoconvex lens four, pass through planoconvex lens
Four focusing, which travel to, to be covered with the speculum of graphene film layer；3 μm of light are reflected in the second resonance intracavity round trip by speculum
Propagate, the inverted population density of upper energy level largely accumulates；The power for adjusting pumping source two to be co-doped with ZBLAN light from holmium-spectrum
3 μm of luminous powers of fibre output are relatively low（Graphene can not be caused to reach saturation）, graphene film is in high loss（It is in low Q
Value）State；
Step 2：The working status of pumping source two is kept, opens pumping source one, the 1550nm light that pumping source one is launched passes through
2 μm of light are produced after Fiber Bragg Grating FBG and thulium-holmium co-doped fiber, 2 μm of light are after dichroic mirror two reflexes to dichroic mirror one, instead
Planoconvex lens four is incident upon, is traveled to and is covered with the speculum of graphene film layer by the focusing of planoconvex lens four；2 μm of light pass through speculum
Roundtrip propagation in the first resonator is reflected in, inverted population is accumulated in gain fibre；
Step 3：Gradually the output power of increase pumping source one, 2 μm of amplified spontaneous emission light gradually strengthen；With holmium-spectrum
The accumulation of particle inverted population in ZBLAN optical fiber is co-doped with, light intensity gradually increases in resonator, as spontaneous radiation light intensity increases
Greatly, the saturated absorption coefficient of graphene film reduces, and continues to increase spontaneous radiation light intensity so that the absorption of graphene film reaches
Saturation, Q values surge in resonator, and the inverted population of accumulation is consumed in a short time, produce laser generation and from defeated
Outlet exports 2 μm higher and 3 μm of pulses of peak power at the same time；
Step 4：The output power of pumping source one and pumping source two is kept, population to be reversed is depleted, and graphene is thin
Film returns to high loss state within the relaxation time, under this working status of pumping source one and pumping source two, two gain fibres
Interior inverted population is accumulated again, and the higher 2 μm of light of power causes graphene to reach saturation again, exports 2 μm and 3 μm of arteries and veins
Punching recovers paramount damage state again, so repeats, so as to fulfill 2 μm of same repetition and 3 μm of Q impulses.
A kind of middle infrared double-wave length based on graphene of the present invention is with repetition pulse optical fiber, including is covered with graphite
The speculum of alkene film layer, the speculum same level position are equipped with dichroic mirror one, and the dichroic mirror one is relative to level side
To 45 ° of arrangements are tilted, relatively parallel dichroic mirror two is equipped with directly over the dichroic mirror one, the top of dichroic mirror two is equipped with arteries and veins
Rush output terminal；Planoconvex lens four is equipped between the dichroic mirror one and speculum, light beam can be focused to reflection by the planoconvex lens four
Mirror；The dichroic mirror one is connected with 3 μm of light and route occurs, and the dichroic mirror two is connected with 2 μm of light and route occurs, and 3 μm of light occurs
It is parallel that route occurs for route and 2 μm of light.
As a result of said structure, dichroic mirror two is located at the surface of dichroic mirror one, and dichroic mirror two and dichroic mirror one
45 ° of arrangements are tilted both with respect to horizontal direction, light can travel on dichroic mirror one vertically after the reflection of dichroic mirror two；Together
Sample light can travel on dichroic mirror two vertically after the reflection of dichroic mirror one；Speculum is in same level with dichroic mirror one
On position, planoconvex lens four is located on same level position with dichroic mirror one and speculum, planoconvex lens four convex surface facing speculum, can be with
The light from one horizontal irradiation of dichroic mirror to planoconvex lens four, focus on speculum；Speculum can reflex to light level
Planoconvex lens four, planoconvex lens four, which collimates the light into, is incident upon dichroic mirror one；Dichroic mirror two occurs on route positioned at 2 μm of light, dichroic mirror one
Occur positioned at 3 μm of light on route, the propagation path of the light of two wavelength is kept horizontally or vertically.It is humorous that dichroic mirror one is in 3 μm of light
Shake in chamber, dichroic mirror two is in 2 μm of optical cavities, and two dichroic mirrors have direction guiding effect at the same time to 2 μm and 3 μm of light.
Form a plurality of light path between dichroic mirror one, dichroic mirror two and speculum, 2 μm of light and 3 μm of light can between a plurality of light path along
Particular axis is propagated.2 μm of light focus to after can converging after the reflection of dichroic mirror two with 3 μm of light and are covered with graphene film layer
Speculum on, when 2 μm of light and 3 μm of light are being propagated along particular axis, inverted population constantly accumulates；Graphene film
Characteristic with saturable absorption, when increasing with spontaneous radiation light intensity, the saturated absorption coefficient of graphene reduces, and graphene is thin
Film can suddenly by " bleaching " and absorption coefficient is preferably minimized, at this moment intracavitary Q values surge at this time, produce the output Q-switched arteries and veins of laser generation
Punching.
A kind of middle infrared double-wave length based on graphene of the present invention is the same as repetition pulse optical fiber, 2 μm of light hair
Means of livelihood line includes pumping source one connected in sequence, light Bragg grating and thulium-holmium co-doped fiber, the thulium-holmium co-doped fiber
Planoconvex lens two is equipped between dichroic mirror two, the planoconvex lens two can collimate the light of thulium-holmium co-doped fiber output；The light
Bragg grating is to forming the first resonator between speculum.
As a result of said structure, pumping source one sustainedly and stably output light source, light source can pass through optical fiber Bragg
After grating, 2 μm of light are produced by thulium-holmium co-doped fiber, when 2 μm of light pass through planoconvex lens two, in horizontal transmission to dichroic mirror two, by
45 ° of placements are tilted relative to horizontal direction in dichroic mirror two, light travels on dichroic mirror one vertically after the reflection of dichroic mirror two,
Speculum is reached afterwards, then is back to Fiber Bragg Grating FBG from speculum, so that first resonator of 2 μm of light is formed, 2
μm light roundtrip propagation in the first resonator, the inverted population density of upper energy level constantly accumulate.Pass through pumping source one, optical fiber cloth
Glug grating and thulium-holmium co-doped fiber can continually and steadily send 2 μm of light, with reference to dichroic mirror two, dichroic mirror one and speculum
The first stable resonator can be formed, it is simple in sturcture, ingenious in design.
With repetition pulse optical fiber, 3 μm of light road occurs for a kind of middle infrared double-wave length based on graphene of the present invention
Line includes pumping source two, and planoconvex lens one and holmium-praseodymium are co-doped with fluoride ZBLAN optical fiber, and the planoconvex lens one can send out pumping source two
The light penetrated focuses to the input terminal that holmium-praseodymium is co-doped with fluoride ZBLAN optical fiber, and the holmium-praseodymium is co-doped with the defeated of fluoride ZBLAN optical fiber
Enter end face and be equipped with film plating layer；Holmium-the praseodymium is co-doped with being equipped with planoconvex lens three, institute between fluoride ZBLAN optical fiber and dichroic mirror one
Holmium-praseodymium can be co-doped with the light collimation of fluoride ZBLAN optical fiber outputs by stating planoconvex lens three；The film plating layer is formed between speculum
Second resonator.
As a result of said structure, pumping source two can sustainedly and stably output light source, light-resource fousing to holmium-praseodymium be co-doped with
After the film plating layer of fluoride ZBLAN optic fibre input ends, 3 μm of light are produced, 3 μm of light levels are traveled on dichroic mirror one, through two colors
Mirror one reaches speculum, and speculum reflexes to 3 μm of light on dichroic mirror one in the horizontal direction, since dichroic mirror one is relative to level
Direction tilts 45 ° of placements, and a part of 3 μm of light are reflected on dichroic mirror two vertically, and 3 μm of light of a part continue saturating in the horizontal direction
Dichroic mirror one is crossed, is projected to film plating layer, so as to form second resonator of 3 μm of light, 3 μm of light are in the second resonance intracavity round trip
Propagate, the inverted population density of upper energy level constantly accumulates.By pumping source two, planoconvex lens one and holmium-praseodymium are co-doped with fluoride
ZBLAN optical fiber can continually and steadily send 3 μm of light, can be formed with reference to dichroic mirror two, dichroic mirror one and speculum stable
Second resonator, it is simple in sturcture, ingenious in design.
A kind of middle infrared double-wave length based on graphene of the present invention is the same as repetition pulse optical fiber, the pumping source one
For 1550nm continuous laser diodes, the pumping source two is 1150nm continuous laser diodes.
A kind of middle infrared double-wave length based on graphene of the present invention is the same as repetition pulse optical fiber, the optical fiber Bradley
Transmissivity of the lattice grating to 1550nm light>99%, to the reflectivity of 2 μm of light>99%；Transmissivity of the film plating layer to 1150nm light
>99%, to the reflectivity of 3 μm of light>99%.
As a result of said structure, the 1550nm light launched from pumping source one can pass through light with high transmitance
Fine Bragg grating, and the 2 μm of light reflected from speculum can be by Fiber Bragg Grating FBG with high reflectance secondary reflection again
Go back, so as to improve the work efficiency of the first resonator, significantly reduce loss；The 1150nm launched from pumping source two
Light can pass through film plating layer with high transmitance, and the 3 μm of light reflected from speculum can be by film plating layer with high reflection
Rate reflects back again, so as to improve the work efficiency of the second resonator, significantly reduces loss.
A kind of middle infrared double-wave length based on graphene of the present invention is the same as repetition pulse optical fiber, the dichroic mirror one
To 1150nm light transmissions>99%, it is equal to 1550nm light and 2 μm of light reflectivities>99%, be to 3 μm of light reflectivities and transmissivity
50%；Reflectivity of the dichroic mirror two to 1550nm light>99%, it is saturating to 3 μm of light to 2 μm of light reflectivity=80%, transmissivity=20%
Penetrate rate>99%.
As a result of said structure, 1550nm light and 2 μm of light reach dichroic mirror for the moment, can be reflexed to high reflectance
On dichroic mirror two, 3 μm of light reach dichroic mirror for the moment, and transmitted through dichroic mirror one, half reflexes on dichroic mirror two half,
1150nm light can not almost pass through dichroic mirror two；When 1550nm light and 3 μm of light reach dichroic mirror two, it can be reflected with high reflectance
To dichroic mirror one, when 2 μm of light reach dichroic mirror two, 80% 2 μm of light are reflected, and 20% 2 μm of energy transmissives cross dichroic mirror two,
Accurately form stable light path.
A kind of middle infrared double-wave length based on graphene of the present invention is common with repetition pulse optical fiber, the thulium-holmium
The input terminal for mixing optical fiber is set to vertical cut face, and the output terminal of the thulium-holmium co-doped fiber is set to 8 ° of scarf.
As a result of said structure, the output power of 2 μm of light is improved, reduces loss.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, a kind of middle infrared double-wave length based on graphene of the invention is ingenious in design with repetition pulse optical fiber,
Cooperate between each component close, compact flexible, small volume, is easily integrated.
2nd, for a kind of middle infrared double-wave length based on graphene of the invention with repetition pulse optical fiber, loss is low, accurate
Stable light path is really efficiently formed, work efficiency is high, easy to operate.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of middle infrared double-wave length based on graphene with repetition pulse optical fiber；
Fig. 2 is two pulse signal strengths and graphene absorption coefficient graph of relation.
Marked in figure：1 is pumping source one, and 2 be Fiber Bragg Grating FBG, and 3 be thulium-holmium co-doped fiber, and 4 be planoconvex lens two, 5
It is planoconvex lens one for pumping source two, 6,7 be film plating layer, and 8 are co-doped with fluoride ZBLAN optical fiber for holmium-praseodymium, and 9 be planoconvex lens three, and 10 are
Dichroic mirror one, 11 be planoconvex lens four, and 12 be graphene film layer, and 13 be speculum, and 14 be dichroic mirror two, and 15 be output terminal.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to which the object, technical solution and advantage of invention are more clearly understood, with reference to the accompanying drawings and embodiments, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Embodiment 1
As shown in Figure 1, a kind of middle infrared double-wave length based on graphene is with repetition pulse optical fiber, including it is covered with stone
The speculum 13 of black alkene film layer 12, from the point of view of depression angle：13 same level position of speculum is equipped with dichroic mirror 1, dichroic mirror
One 10 tilt 45 ° of arrangements relative to horizontal direction, and relatively parallel dichroic mirror 2 14, dichroic mirror are equipped with directly over dichroic mirror 1
2 14 tops are equipped with pulse output end 15；Dichroic mirror 1 and speculum 1）Between be equipped with planoconvex lens 4 11,4 11 energy of planoconvex lens
Light beam is focused into speculum 13；Dichroic mirror 1 is connected with 3 μm of light and route occurs, and dichroic mirror 2 14 is connected with 2 μm of light and route occurs,
Route occurs for 3 μm of light and 2 μm of light generation routes are parallel.Dichroic mirror 2 14 is located at the surface of dichroic mirror 1, dichroic mirror two
14 central point is located on the vertical straight line of same with the central point of dichroic mirror 1, and dichroic mirror 2 14 and dichroic mirror 1
45 ° of arrangements are tilted both with respect to horizontal direction, light is irradiated on dichroic mirror 1 vertically after the reflection of dichroic mirror 2 14；Light
After the reflection of dichroic mirror 1, travel to vertically on dichroic mirror 2 14；Speculum 13 is in same level with dichroic mirror 1
On position, planoconvex lens 4 11 is located on same level position with dichroic mirror 1 and speculum 13, planoconvex lens 4 11 convex surface facing anti-
Mirror 13 is penetrated, the light from one 10 horizontal irradiation of dichroic mirror to planoconvex lens 4 11, is focused on speculum 13；Speculum 13 is by light
To planoconvex lens 4 11, planoconvex lens 4 11, which collimates the light into, to be incident upon on dichroic mirror 1 for horizontal reflection；Dichroic mirror 2 14 is located at 2 μm of light
On generation route, dichroic mirror 1 occurs on route positioned at 3 μm of light, ensures that the round of light is kept horizontally or vertically.Two
Form a plurality of light path between Look mirror 1, dichroic mirror 2 14 and speculum 13,2 μm of light and 3 μm of light between a plurality of light path along
Particular axis is propagated.2 μm of light focus to after converging after the reflection of dichroic mirror 2 14 with 3 μm of light and are covered with graphene film layer 12
Speculum 13 on, when 2 μm of light and 3 μm of light are being propagated along particular axis, inverted population constantly accumulates；Graphene is thin
Film has the characteristic of saturable absorption, and when increasing with spontaneous radiation light intensity, the saturated absorption coefficient of graphene reduces, graphene
Film can suddenly by " bleaching " and absorption coefficient is preferably minimized, at this moment intracavitary Q values surge at this time, produce laser generation it is output Q-switched
Pulse.
Route, which occurs, for 2 μm of light includes pumping source 1 connected in sequence, Fiber Bragg Grating FBG 2 and thulium-holmium co-doped fiber 3,
Thulium-planoconvex lens 24 is equipped between holmium co-doped fiber 3 and dichroic mirror 2 14, planoconvex lens 24 can export thulium-holmium co-doped fiber 3
Light collimates；Fiber Bragg Grating FBG 2 is to forming the first resonator between speculum 13；The input terminal of thulium-holmium co-doped fiber 3 is set to
Vertical cut face, the output terminal of thulium-holmium co-doped fiber 3 are set to 8 ° of scarf.Pumping source 1 is 1550nm continuous laser diodes,
Sustainedly and stably output light source, light produce 2 to pumping source 1 after Fiber Bragg Grating FBG 2, by thulium-holmium co-doped fiber 3
μm light, when 2 μm of light pass through planoconvex lens 24, in horizontal transmission to dichroic mirror 2 14, due to dichroic mirror 2 14 relative to horizontal direction
45 ° of placements are tilted, light travels on dichroic mirror 1 vertically after the reflection of dichroic mirror 2 14, reaches speculum 13 afterwards, then
Fiber Bragg Grating FBG 2 is back to from speculum 13, forms the first resonator of 2 μm of light, 2 μm of light are in the first resonance intracavity round trip
Propagate, the inverted population density of upper energy level constantly accumulates.It is co-doped with by pumping source 1, Fiber Bragg Grating FBG 2 and thulium-holmium
Optical fiber 3 sustainedly and stably sends 2 μm of light, and the first humorous of stabilization is formed with reference to dichroic mirror 2 14, dichroic mirror 1 and speculum 13
Shake chamber.
Route, which occurs, for 3 μm of light includes pumping source 25, and planoconvex lens 1 and holmium-praseodymium are co-doped with fluoride ZBLAN optical fiber 8, plano-convex
The light that pumping source 25 is launched is focused to the input terminal that holmium-praseodymium is co-doped with fluoride ZBLAN optical fiber 8 by mirror 1, and holmium-praseodymium is co-doped with being fluorinated
The input terminal end face of thing ZBLAN optical fiber 8 is equipped with film plating layer 7；Holmium-praseodymium is co-doped between fluoride ZBLAN optical fiber 8 and dichroic mirror 1
Equipped with planoconvex lens 39, holmium-praseodymium is co-doped with the light that fluoride ZBLAN optical fiber 8 exports and collimated by planoconvex lens 39；Film plating layer 7 is to reflection
The second resonator is formed between mirror 13.Pumping source 25 is 1150nm continuous laser diodes, and pumping source 25 is sustainedly and stably defeated
Go out light source, after light focusing to holmium-praseodymium is co-doped with the film plating layer 7 of 8 input terminal of fluoride ZBLAN optical fiber, produce 3 μm of light, 3 μm of light water
Flat pass and be multicast on dichroic mirror 1, reach speculum 13 through dichroic mirror 1, speculum reflexes to 3 μm of light in the horizontal direction
On dichroic mirror 1, since dichroic mirror 1 tilts 45 ° of placements relative to horizontal direction, a part of 3 μm of light are reflected in vertically
On dichroic mirror 2 14,3 μm of light of a part continue to pass through dichroic mirror 1 in the horizontal direction, film plating layer 7 are projected to, so as to form one
Second resonator of 3 μm of light of bar, 3 μm of light roundtrip propagation in the second resonator, the inverted population density of upper energy level are constantly big
Amount accumulation.By pumping source 25, planoconvex lens 1 and holmium-praseodymium are co-doped with fluoride ZBLAN optical fiber 8 and can continually and steadily send 3 μ
M light, the second stable resonator can be formed with reference to dichroic mirror 2 14, dichroic mirror 1 and speculum 13.
Transmissivity of the Fiber Bragg Grating FBG 2 to 1550nm light>99%, to the reflectivity of 2 μm of light>99%；Film plating layer 7 is right
The transmissivity of 1150nm light>99%, to the reflectivity of 3 μm of light>99%.The 1550nm light launched from pumping source 1 is with high
Transmitance passes through Fiber Bragg Grating FBG 2, and from 2 μm of light that speculum 13 reflects by Fiber Bragg Grating FBG 2 with high anti-
Penetrate rate to reflect back again, so as to improve the work efficiency of the first resonator, significantly reduce loss；From pumping source 25
The 1150nm light launched passes through film plating layer 7 with high transmitance, and the 3 μm of light reflected from speculum are by film plating layer 7
Reflected back again with high reflectance, so as to improve the work efficiency of the second resonator, significantly reduce loss.
One 10 pairs of 1150nm light transmissions of dichroic mirror>99%, it is equal to 1550nm light and 2 μm of light reflectivities>99%, to 3 μm of light
Reflectivity and transmissivity is 50%；The reflectivity of 2 14 pairs of 1550nm light of dichroic mirror>99%, to 2 μm of light reflectivity=80%, transmission
Rate=20%, to 3 μm of light transmissions>99%.When 1550nm light and 2 μm of light reach dichroic mirror 1, two are reflexed to high reflectance
In Look mirror 2 14, for 3 μm of light when reaching dichroic mirror 1, for half transmitted through dichroic mirror 1, half reflexes to dichroic mirror 2 14
On, 1150nm light can not almost pass through dichroic mirror 2 14；When 1550nm light and 3 μm of light reach dichroic mirror 2 14, with high reflection
Rate is reflexed on dichroic mirror 1, and when 2 μm of light reach dichroic mirror 2 14,80% 2 μm of light are reflected, 20% 2 μm of energy transmissives
Dichroic mirror 2 14 is crossed, accurately forms stable light path.
Embodiment 2
As depicted in figs. 1 and 2, pumping source 25 is opened, the 1150nm light that pumping source 25 is launched is focused on by planoconvex lens 1
It is co-doped with to holmium-spectrum on the film plating layer 7 of the input terminal of ZBLAN optical fiber 8, produces the output that 3 μm of light are co-doped with ZBLAN optical fiber 8 from holmium-spectrum
End output, 3 μm of light are traveled on dichroic mirror 1 by the collimation of planoconvex lens 39, and 3 μm of light pass through dichroic mirror 1, and are transmitted through
Planoconvex lens 4 11, is traveled to by the focusing of planoconvex lens 4 11 and is covered with the speculum 13 of graphene film layer 12；3 μm of light are by anti-
Penetrate mirror 13 and be reflected in roundtrip propagation in the second resonator, the inverted population density of upper energy level largely accumulates；Adjust pumping source 25
Power cause from holmium-spectrum be co-doped with ZBLAN optical fiber 8 output 3 μm of luminous powers it is relatively low so that graphene is unable to reach saturation shape
State, graphene film are in high and are lost（It is in low reactance-resistance ratio）State；The working status of pumping source 25 is kept, opens pumping source one
1, the 1550nm light that pumping source 1 is launched is by producing 2 μm of light, 2 μm of light after Fiber Bragg Grating FBG 2 and thulium-holmium co-doped fiber
After dichroic mirror 2 14 reflexes to dichroic mirror 1, planoconvex lens 4 11 is reflexed to, focuses on to travel to by planoconvex lens 4 11 and covers
Have on the speculum 13 of graphene film layer 12；2 μm of light are reflected in roundtrip propagation in the first resonator, upper energy by speculum 13
The inverted population density of level largely accumulates；Gradually the output power of increase pumping source 1,2 μm of amplified spontaneous emission light are gradual
Enhancing；As Fiber Bragg Grating FBG 2 and holmium-spectrum are co-doped with the accumulation of particle inverted population in ZBLAN optical fiber 8, in resonator
Light intensity gradually increases, and as spontaneous radiation light intensity increases, the saturated absorption coefficient of graphene film reduces, and continues to increase spontaneous spoke
Light intensity is penetrated, when the spontaneous radiation light intensity of amplification and the comparable saturated absorption light intensity of graphene film, graphene film absorbs
Reach saturation value, suddenly by " bleaching " and absorption coefficient is preferably minimized, 2 μm of Q impulse optical fiber lasers stablize output representative values
Pulse width 490ns, repetition rate 80kHz, in 2 μm of flashlights by graphene film " bleaching ", make its absorption coefficient drop rapidly
To it is minimum when, 2 μm and 3 μm accumulation inverted populations be consumed in a short time, Q values surge in two resonators, generation
Laser generation and export peak power higher 2 μm and 3 μm of short pulses at the same time, can be realized by adjusting 1 watt level of pumping source
Control to double-wavelength pulse repetition rate height, increases the power of pumping source 1, and double-wavelength pulse repetition rate synchronously improves；
Reduce the power of pumping source 1, double-wavelength pulse repetition rate synchronously reduces.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (7)
1. method of the infrared double-wave length with repetition pulse in a kind of transmitting, it is characterised in that comprise the following steps：
Step 1：Open pumping source two（5）, pumping source two（5）The 1150nm light of transmitting passes through planoconvex lens one（6）Focus to holmium-
Praseodymium is co-doped with fluoride ZBLAN optical fiber（8）Input terminal film plating layer（7）On, produce 3 μm of light and be co-doped with fluoride ZBLAN from holmium-praseodymium
Optical fiber（8）Output terminal output, 3 μm of light pass through planoconvex lens three（9）Collimation travels to dichroic mirror one（10）On, 3 μm of light pass through two
Look mirror one（10）, and it is transmitted through planoconvex lens four（11）, pass through planoconvex lens four（11）Focusing, which travels to, is covered with graphene film layer
（12）Speculum（13）On；3 μm of light pass through speculum（13）It is reflected in roundtrip propagation in the second resonator, the reversion of upper energy level
Population density largely accumulates；Adjust pumping source two（5）Power to be co-doped with fluoride ZBLAN optical fiber from holmium-praseodymium（8）Output
3 μm of luminous powers it is relatively low, graphene film is in high and is lost（It is in low reactance-resistance ratio）State；
Step 2：Keep pumping source two（5）Working status, open pumping source one（1）, pumping source one（1）The 1550nm of transmitting
Light passes through Fiber Bragg Grating FBG（2）Pass through dichroic mirror two with 2 μm of light of generation, 2 μm of light after thulium-holmium co-doped fiber（14）Reflex to
Dichroic mirror one（10）Afterwards, planoconvex lens four is reflexed to（11）, pass through planoconvex lens four（11）Focusing, which travels to, is covered with graphene film layer
（12）Speculum（13）On；2 μm of light pass through speculum（13）It is reflected in roundtrip propagation in the first resonator, the reversion of upper energy level
Population density largely accumulates；
Step 3：Gradually increase pumping source one（1）Output power, amplify 2 μm of spontaneous emission lights；With Fiber Bragg Grating FBG
（2）Fluoride ZBLAN optical fiber is co-doped with holmium-praseodymium（8）The accumulation of middle inverted population, light intensity gradually increases in resonator, with
Spontaneous radiation light intensity increases, and the saturated absorption coefficient of graphene film reduces, and continues to increase spontaneous radiation light intensity so that graphene
The absorption of film reaches saturation, and the inverted population of accumulation is consumed in a short time, and Q values surge in resonator, produces
Laser generation and from output terminal（15）Export peak power higher 2 μm and 3 μm of pulses at the same time；
Step 4：Keep pumping source one at this time（1）With pumping source two（5）Working status, population to be reversed is depleted, stone
Black alkene film returns to high loss state within the relaxation time, in pumping source one（1）With pumping source two（5）This working status
Under, inverted population is accumulated again in two gain fibres, reaches the saturation value of graphene, again output dual wavelength pulse,
So repeat, realize 2 μm and 3 μm of Q impulses of same repetition.
2. a kind of middle infrared double-wave length based on graphene for the method for implementing claim 1 is with repetition pulse optical fiber,
It is characterized in that：Including being covered with graphene film layer（12）Speculum（13）, the speculum（13）Same level is set on position
There is dichroic mirror one（10）, the dichroic mirror one（10）45 ° of arrangements, the dichroic mirror one are tilted relative to horizontal direction（10）On just
Side is equipped with relatively parallel dichroic mirror two（14）, the dichroic mirror two（14）Top is equipped with pulse output end（15）；Two color
Mirror one（10）With speculum（13）Between be equipped with planoconvex lens four（11）, the planoconvex lens four（11）Light beam can be focused to speculum
（13）；The dichroic mirror one（10）It is connected with 3 μm of light and route, the dichroic mirror two occurs（14）It is connected with 2 μm of light and route occurs, it is described
Route occurs for 3 μm of light and 2 μm of light generation routes are parallel.
3. for a kind of middle infrared double-wave length based on graphene as claimed in claim 2 with repetition pulse optical fiber, it is special
Sign is：Route, which occurs, for 2 μm of light includes pumping source one connected in sequence（1）, Fiber Bragg Grating FBG（2）It is common with thulium-holmium
Mix optical fiber（3）, the thulium-holmium co-doped fiber（3）With dichroic mirror two（14）Between be equipped with planoconvex lens two（4）, the planoconvex lens two
（4）Can be by thulium-holmium co-doped fiber（3）The light collimation of output；The Fiber Bragg Grating FBG（2）To speculum（13）Between formed
First resonator；Route, which occurs, for 3 μm of light includes pumping source two（5）, planoconvex lens one（6）Fluoride ZBLAN is co-doped with holmium-praseodymium
Optical fiber（8）, the planoconvex lens one（6）Can be by pumping source two（5）The light of transmitting focuses to holmium-praseodymium and is co-doped with fluoride ZBLAN optical fiber
（8）Input terminal, the holmium-praseodymium is co-doped with fluoride ZBLAN optical fiber（8）Input terminal end face be equipped with film plating layer（7）；The holmium-
Praseodymium is co-doped with fluoride ZBLAN optical fiber（8）With dichroic mirror one（10）Between be equipped with planoconvex lens three（9）, the planoconvex lens three（9）Energy will
Holmium-praseodymium is co-doped with fluoride ZBLAN optical fiber（8）The light collimation of output；The film plating layer（7）To speculum（13）Between form second
Resonator.
4. for a kind of middle infrared double-wave length based on graphene as claimed in claim 3 with repetition pulse optical fiber, it is special
Sign is：The pumping source one（1）For 1550nm continuous laser diodes, the pumping source two（5）For 1150nm continuous lasers
Diode.
5. for a kind of middle infrared double-wave length based on graphene as claimed in claim 4 with repetition pulse optical fiber, it is special
Sign is：The Fiber Bragg Grating FBG（2）To the transmissivity of 1550nm light>99%, to the reflectivity of 2 μm of light>99%；The plating
Film layer（7）To the transmissivity of 1150nm light>99%, to the reflectivity of 3 μm of light>99%.
6. a kind of middle infrared double-wave length based on graphene is with repetition pulse optical fiber as described in claim 4 or 5, its
It is characterized in that：The dichroic mirror one（10）To 1150nm light transmissions>99%, it is equal to 1550nm light and 2 μm of light reflectivities>99%,
It is 50% to 3 μm of light reflectivities and transmissivity；The dichroic mirror two（14）To the reflectivity of 1550nm light>99%, it is anti-to 2 μm of light
Penetrate rate=80%, transmissivity=20%, to 3 μm of light transmissions>99%.
7. for a kind of middle infrared double-wave length based on graphene as claimed in claim 3 with repetition pulse optical fiber, it is special
Sign is：The thulium-holmium co-doped fiber（3）Input terminal be set to vertical cut face, the thulium-holmium co-doped fiber（3）Output terminal set
For 8 ° of scarf.
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| CN109904716B (en) * | 2019-04-25 | 2020-02-18 | 电子科技大学 | Dual-wavelength same-repetition-frequency mid-infrared ultrashort pulse all-fiber laser source |
| CN110165528B (en) * | 2019-05-30 | 2021-02-09 | 四川大学 | Multi-wavelength same-repetition-frequency and repetition-frequency-controllable mid-infrared all-fiber laser |
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