CN105161968A - Graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser - Google Patents
Graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 61
- 239000000835 fiber Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 61
- 239000013307 optical fiber Substances 0.000 claims description 54
- 239000005371 ZBLAN Substances 0.000 claims description 32
- 238000007747 plating Methods 0.000 claims description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 20
- PJHIYISBDSWHHA-UHFFFAOYSA-N [Ho].[Pr] Chemical compound [Ho].[Pr] PJHIYISBDSWHHA-UHFFFAOYSA-N 0.000 claims description 20
- WQNUBQUNDDGZTB-UHFFFAOYSA-N [Ho].[Tm] Chemical compound [Ho].[Tm] WQNUBQUNDDGZTB-UHFFFAOYSA-N 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 12
- 230000002269 spontaneous effect Effects 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001579 optical reflectometry Methods 0.000 claims description 9
- 230000011514 reflex Effects 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 6
- 230000001902 propagating effect Effects 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000004446 light reflex Effects 0.000 claims description 5
- 229910052689 Holmium Inorganic materials 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
- 230000035508 accumulation Effects 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 4
- 230000005571 horizontal transmission Effects 0.000 description 4
- 230000000644 propagated effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 208000002847 Surgical Wound Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002439 hemostatic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention discloses a graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser, which belongs to the field of pulsed fiber lasers. The graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser comprises a reflector coated with a graphene thin film; a first diachroscope is arranged at the same horizontal position of the reflector; the first diachroscope is arranged obliquely at an angle of 45 DEG in relative to the horizontal direction; a relatively-parallel second diachroscope is arranged right above the first diachroscope; a dual-wavelength pulse output end is arranged above the second diachroscope; a fourth plano-convex lens is arranged between the first diachroscope and the reflector; the fourth plano-convex lens can focus light beams into the reflector; the first diachroscope is located in a 3mum optic resonator, the second diachroscope is located in a 2mum optic resonator, and thus both the two diachroscopes can play a direction guiding role on 2mum and 3mum light. Thus, the design is delicate, mid-infrared dual-wavelength co-repetition frequency high-power laser pulses can be acquired, and compared with the traditional method, the structure is simple, the size is small, the loss is low, the operation is simple and convenient, and integration is easy.
Description
Technical field
The present invention relates to a kind of pulse optical fiber, particularly a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber.
Background technology
It is high that fiber laser has conversion efficiency, volume is little, output beam quality is excellent, laser threshold is low, be easy to integrated, the advantages such as good heat dissipation effect, dual wavelength fibre laser defines according to Output of laser wavelength channel quantity, it produces at soliton pulse, difference interference is found range, light sensing, all as primary light source in the research of microwave radio signal and high-repetition-rate ultra-short pulse generation, in 2-5 μm, pulsed infrared laser is in national defence, military, medical treatment, the aspects such as communication have broad application prospects, as hydrone has very strong absworption peak at 2 μm and 3 mu m wavebands, may be used for laser surgey of new generation, blood is condensed rapidly, surgical wound surface is little, hemostatic good etc.
The middle infrared pulse optical-fiber laser of currently available technology mainly concentrates on and realizes Single wavelength pulse, can not practical requirement, and infrared double-wave length laser pulse in the more difficult realization of conventional method.In being realized by the mode of actively Q-switched and actively Q-switched guiding gain modulation in prior art, infrared double wave long pulse exports, and structure is too complicated, make fiber laser lose intrinsic compact flexibly, the advantage such as small volume.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, one is provided to utilize Graphene saturable absorption characteristic, passive Q-adjusted the stable of 2 μm and 3 μm that realize exports with repetition dual wavelength Q impulse, structure is simple, small volume, loss is low, easy and simple to handle, is easy to integrated middle infrared double-wave length with repetition pulse optical fiber.
The technical solution used in the present invention is as follows:
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, comprise the speculum being covered with graphene film layer, described speculum same level position is provided with dichroic mirror one, described dichroic mirror one tilts 45 ° to arrange relative to horizontal direction, be provided with opposing parallel dichroic mirror two directly over described dichroic mirror one, above described dichroic mirror two, be provided with pulse output end; Be provided with planoconvex lens four between described dichroic mirror one and speculum, light beam can be focused to speculum by described planoconvex lens four; Described dichroic mirror one is connected with 3 μm of light generation routes, and described dichroic mirror two is connected with 2 μm of light generation routes, and described 3 μm of light generation routes and 2 μm of light generation routes parallel.
Owing to have employed said structure, dichroic mirror two is positioned at directly over dichroic mirror one, and dichroic mirror two and dichroic mirror one all tilt 45 ° to arrange relative to horizontal direction, and light, after dichroic mirror two reflects, can vertically propagate on dichroic mirror one; Same light, after dichroic mirror one reflects, can vertically propagate on dichroic mirror two; Speculum and dichroic mirror one are on same level position, and planoconvex lens four is positioned on same level position with dichroic mirror one and speculum, planoconvex lens four convex surface facing speculum, can, from dichroic mirror one horizontal irradiation to the light on planoconvex lens four, focus on speculum; Speculum can by light horizontal reflection to planoconvex lens four, and optical alignment is incident upon dichroic mirror one by planoconvex lens four; Dichroic mirror two is positioned on 2 μm of light generation routes, and dichroic mirror one is positioned on 3 μm of light generation routes, and the propagation path of the light of two wavelength all keeps level or vertical.Dichroic mirror one is in 3 μm of optical cavities, and dichroic mirror two is in 2 μm of optical cavities, and two dichroic mirrors all have direction guiding effect to 2 μm and 3 μm of light simultaneously.Dichroic mirror one, form many light paths between dichroic mirror two and speculum, 2 μm of light and 3 μm of light can be propagated along particular axis between many light paths.2 μm of light focus to after can converging with 3 μm of light after dichroic mirror two reflects be covered with graphene film layer speculum on, at 2 μm of light and 3 μm of light when propagating along particular axis, inverted population constantly accumulates; Graphene film has the characteristic of saturable absorption, along with spontaneous radiation light intensity increase time, the saturated absorption coefficient of Graphene reduces, and graphene film can by " bleaching ", absorption coefficient drops to minimum suddenly, now at this moment Q value is surged in chamber, produces the output Q-switched pulse of laser generation.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, described 2 μm of light generation routes comprise the pumping source one connected in turn, light Bragg grating and thulium-holmium co-doped fiber, described thulium-be provided with planoconvex lens two between holmium co-doped fiber and dichroic mirror two, the optical alignment that thulium-holmium co-doped fiber can export by described planoconvex lens two; The first resonant cavity is formed between described light Bragg grating to speculum.
Owing to have employed said structure, pumping source one can output light source sustainedly and stably, light source is after Fiber Bragg Grating FBG, 2 μm of light are produced through thulium-holmium co-doped fiber, 2 μm of light are when planoconvex lens two, horizontal transmission is on dichroic mirror two, because dichroic mirror two tilts 45 ° to place relative to horizontal direction, light vertically propagates on dichroic mirror one after dichroic mirror two reflects, arrive speculum afterwards, Fiber Bragg Grating FBG is back to again from speculum, thus form the first resonant cavity of 2 μm of light, 2 μm of light roundtrip propagation in the first resonant cavity, the inverted population density of upper energy level constantly accumulates.Continual and steady can send 2 μm of light by pumping source one, Fiber Bragg Grating FBG and thulium-holmium co-doped fiber, can form the first stable resonant cavity in conjunction with dichroic mirror two, dichroic mirror one with speculum, structure is simple, designs ingenious.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, 3 μm of light generation routes comprise pumping source two, planoconvex lens one and holmium-praseodymium mix fluoride ZBLAN optical fiber altogether, the light that pumping source two is launched can be focused to the input that holmium-praseodymium mixes fluoride ZBLAN optical fiber altogether by described planoconvex lens one, and the input end face that described holmium-praseodymium mixes fluoride ZBLAN optical fiber is altogether provided with film plating layer; Described holmium-praseodymium is mixed altogether between fluoride ZBLAN optical fiber and dichroic mirror one and is provided with planoconvex lens three, and holmium-praseodymium can be mixed the optical alignment that fluoride ZBLAN optical fiber exports by described planoconvex lens three altogether; The second resonant cavity is formed between described film plating layer to speculum.
Owing to have employed said structure, pumping source two can output light source sustainedly and stably, after light-resource fousing to holmium-praseodymium mixes the film plating layer of fluoride ZBLAN optic fibre input end altogether, produce 3 μm of light, 3 μm of light horizontal transmission are on dichroic mirror one, speculum is arrived through dichroic mirror one, 3 μm of light reflex on dichroic mirror one by speculum in the horizontal direction, because dichroic mirror one tilts 45 ° to place relative to horizontal direction, a part 3 μm of light are vertically reflected on dichroic mirror two, a part 3 μm of light continue in the horizontal direction through dichroic mirror one, be projected to film plating layer, thus form the second resonant cavity of 3 μm of light, 3 μm of light roundtrip propagation in the second resonant cavity, the inverted population density of upper energy level constantly accumulates.By pumping source two, planoconvex lens one and holmium-praseodymium mix fluoride ZBLAN optical fiber altogether continual and steady can send 3 μm of light, and can form the second stable resonant cavity in conjunction with dichroic mirror two, dichroic mirror one with speculum, structure is simple, designs ingenious.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, described pumping source one is 1550nm continuous laser diode, and described pumping source two is 1150nm continuous laser diode.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, described Fiber Bragg Grating FBG to the transmissivity >99% of 1550nm light, to 2 μm of light reflectance >99%; Described film plating layer to the transmissivity >99% of 1150nm light, to 3 μm of light reflectance >99%.
Owing to have employed said structure, the 1550nm light launched from pumping source one can with high transmitance through Fiber Bragg Grating FBG, and again can be reflected back with high reflectance by Fiber Bragg Grating FBG from 2 μm of light that speculum reflects, thus improve the operating efficiency of the first resonant cavity, significantly reduce loss; The 1150nm light launched from pumping source two can with high transmitance through film plating layer, and again can be reflected back with high reflectance by film plating layer from 3 μm of light that speculum reflects, thus improve the operating efficiency of the second resonant cavity, significantly reduce loss.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, described dichroic mirror a pair 1150nm light transmission >99%, to 1550nm light and 2 μm of equal >99% of light reflectivity, 50% is to 3 μm of light reflectivities and transmissivity; Described dichroic mirror two couples of 1550nm light reflectance >99%, to 2 μm of light reflectivity=80%, transmissivity=20%, to 3 μm of light transmission >99%.
Owing to have employed said structure, 1550nm light and 2 μm of light arrive dichroic mirror for the moment, all can reflex on dichroic mirror two with high reflectance, 3 μm of light at arrival dichroic mirror for the moment, half is transmitted through dichroic mirror one, and half reflexes on dichroic mirror two, and 1150nm light almost cannot through dichroic mirror two; When 1550nm light and 3 μm of light arrive dichroic mirror two, all can reflex on dichroic mirror one with high reflectance, when 2 μm of light arrive dichroic mirror two, 2 μm of light of 80% are reflected, and 2 μm of energy transmissive of 20% cross dichroic mirror two, form stable light path accurately.
Of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, the input of described thulium-holmium co-doped fiber is set to vertical cut face, and the output of described thulium-holmium co-doped fiber is set to the scarf of 8 °.
Owing to have employed said structure, improve the power output of 2 μm of light, reduce loss.
In a kind of transmitting of the present invention, infrared double-wave length is with the method for repetition pulse, comprises the following steps:
Step one: open pumping source two, the 1150nm light that pumping source two is launched focuses to holmium-spectrum through planoconvex lens one and mixes on the film plating layer of the input of ZBLAN optical fiber altogether, produce 3 μm of light mix ZBLAN optical fiber altogether output output from holmium-spectrum, 3 μm of light propagate on dichroic mirror one through planoconvex lens three collimation, 3 μm of light transmission dichroic mirrors one, and be transmitted through planoconvex lens four, focused on the speculum propagating into and be covered with graphene film layer by planoconvex lens four; 3 μm of light are reflected in roundtrip propagation in the second resonant cavity through speculum, and the inverted population density of upper energy level accumulates in a large number; Regulate the power of pumping source two to make to mix altogether from holmium-spectrum 3 μm of luminous powers lower (Graphene cannot be made to reach capacity) of ZBLAN optical fiber output, graphene film is in high loss (being namely in low reactance-resistance ratio) state;
Step 2: the operating state keeping pumping source two, open pumping source one, the 1550nm light that pumping source one is launched is by producing 2 μm of light after Fiber Bragg Grating FBG and thulium-holmium co-doped fiber, 2 μm of light reflex to after dichroic mirror one through dichroic mirror two, reflex to planoconvex lens four, focused on by planoconvex lens four on the speculum propagating into and be covered with graphene film layer; 2 μm of light are reflected in roundtrip propagation in the first resonant cavity through speculum, and in gain fibre, inverted population is accumulated;
Step 3: the power output increasing pumping source one gradually, 2 μm of amplified spontaneous emission light strengthen gradually; Along with holmium-spectrum mixes the accumulation of particle inverted population in ZBLAN optical fiber altogether, in resonant cavity, light intensity increases gradually, along with spontaneous radiation light intensity increases, the saturated absorption coefficient of graphene film reduces, continue to increase spontaneous radiation light intensity, the absorption of graphene film is reached capacity, and in resonant cavity, Q value is surged, the inverted population of accumulation is consumed at short notice, produces laser generation and exports peak power higher 2 μm and 3 μm of pulses from output simultaneously;
Step 4: the power output keeping pumping source one and pumping source two, population approach exhaustion to be reversed, graphene film returns to high loss state within the relaxation time, under this operating state of pumping source one and pumping source two, inverted population in two gain fibres is accumulated again, and the higher 2 μm of light of power make Graphene reach capacity again, exports 2 μm and 3 μm of pulses recover paramount damage state again, repetition like this, thus realize 2 μm and 3 μm of Q impulses with repetition.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, design ingenious, cooperatively interact closely between each parts, flexibly compact, small volume, is easy to integrated.
2, of the present invention a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, loss is low, and form stable light path accurately and efficiently, operating efficiency is high, simple to operate.
Accompanying drawing explanation
Fig. 1 is a kind of based on the structural representation of infrared double-wave length in Graphene with repetition pulse optical fiber;
Fig. 2 is two pulse signal strength and Graphene absorption coefficient graph of relation.
Mark in figure: 1 for pumping source one, 2 be Fiber Bragg Grating FBG, 3 is thulium-holmium co-doped fiber, 4 is planoconvex lens two, and 5 is pumping source two, and 6 is planoconvex lens one, 7 is film plating layer, and 8 mix fluoride ZBLAN optical fiber altogether for holmium-praseodymium, and 9 is planoconvex lens three, 10 is dichroic mirror one, 11 is planoconvex lens four, and 12 is graphene film layer, and 13 is speculum, 14 is dichroic mirror two, and 15 is output.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make the object of invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment 1
As shown in Figure 1, a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, comprise the speculum 13 being covered with graphene film layer 12, depression angle: speculum 13 same level position is provided with dichroic mirror 1, dichroic mirror 1 tilts 45 ° to arrange relative to horizontal direction, be provided with opposing parallel dichroic mirror 2 14 directly over dichroic mirror 1, above dichroic mirror 2 14, be provided with pulse output end 15; Dichroic mirror 1 and speculum 1) between be provided with planoconvex lens 4 11, light beam can be focused to speculum 13 by planoconvex lens 4 11; Dichroic mirror 1 is connected with 3 μm of light generation routes, and dichroic mirror 2 14 is connected with 2 μm of light generation routes, and 3 μm of light generation routes and 2 μm of light generation routes parallel.Dichroic mirror 2 14 is positioned at directly over dichroic mirror 1, the central point of dichroic mirror 2 14 and the central point of dichroic mirror 1 are positioned on the vertical straight line of same, and dichroic mirror 2 14 and dichroic mirror 1 all tilt 45 ° to arrange relative to horizontal direction, light, after dichroic mirror 2 14 reflects, is vertically irradiated on dichroic mirror 1; Light, after dichroic mirror 1 reflects, vertically propagates on dichroic mirror 2 14; Speculum 13 and dichroic mirror 1 are on same level position, planoconvex lens 4 11 is positioned on same level position with dichroic mirror 1 and speculum 13, planoconvex lens 4 11 convex surface facing speculum 13, from dichroic mirror 1 horizontal irradiation to the light on planoconvex lens 4 11, focus on speculum 13; Speculum 13 is by light horizontal reflection to planoconvex lens 4 11, and optical alignment is incident upon on dichroic mirror 1 by planoconvex lens 4 11; Dichroic mirror 2 14 is positioned on 2 μm of light generation routes, and dichroic mirror 1 is positioned on 3 μm of light generation routes, ensures that the round of light all keeps level or vertical.Dichroic mirror 1, form many light paths between dichroic mirror 2 14 and speculum 13,2 μm of light and 3 μm of light are propagated along particular axis between many light paths.2 μm of light focus to after converging with 3 μm of light after dichroic mirror 2 14 reflects and are covered with on the speculum 13 of graphene film layer 12, and at 2 μm of light and 3 μm of light when propagating along particular axis, inverted population constantly accumulates; Graphene film has the characteristic of saturable absorption, along with spontaneous radiation light intensity increase time, the saturated absorption coefficient of Graphene reduces, and graphene film can by " bleaching ", absorption coefficient drops to minimum suddenly, now at this moment Q value is surged in chamber, produces the output Q-switched pulse of laser generation.
2 μm of light generation routes comprise the pumping source 1 connected in turn, Fiber Bragg Grating FBG 2 and thulium-holmium co-doped fiber 3, thulium-be provided with planoconvex lens 24 between holmium co-doped fiber 3 and dichroic mirror 2 14, the optical alignment that thulium-holmium co-doped fiber 3 can export by planoconvex lens 24; The first resonant cavity is formed between Fiber Bragg Grating FBG 2 to speculum 13; The input of thulium-holmium co-doped fiber 3 is set to vertical cut face, and the output of thulium-holmium co-doped fiber 3 is set to the scarf of 8 °.Pumping source 1 is 1550nm continuous laser diode, pumping source 1 output light source sustainedly and stably, light is after Fiber Bragg Grating FBG 2, 2 μm of light are produced through thulium-holmium co-doped fiber 3, 2 μm of light are through planoconvex lens 24 time, horizontal transmission is on dichroic mirror 2 14, because dichroic mirror 2 14 tilts 45 ° to place relative to horizontal direction, light vertically propagates on dichroic mirror 1 after dichroic mirror 2 14 reflects, arrive speculum 13 afterwards, Fiber Bragg Grating FBG 2 is back to again from speculum 13, form the first resonant cavity of 2 μm of light, 2 μm of light roundtrip propagation in the first resonant cavity, the inverted population density of upper energy level constantly accumulates.Send 2 μm of light sustainedly and stably by pumping source 1, Fiber Bragg Grating FBG 2 and thulium-holmium co-doped fiber 3, form the first stable resonant cavity in conjunction with dichroic mirror 2 14, dichroic mirror 1 with speculum 13.
3 μm of light generation routes comprise pumping source 25, planoconvex lens 1 and holmium-praseodymium mix fluoride ZBLAN optical fiber 8 altogether, the light that pumping source 25 is launched is focused to the input that holmium-praseodymium mixes fluoride ZBLAN optical fiber 8 altogether by planoconvex lens 1, and the input end face that holmium-praseodymium mixes fluoride ZBLAN optical fiber 8 is altogether provided with film plating layer 7; Holmium-praseodymium is mixed altogether between fluoride ZBLAN optical fiber 8 and dichroic mirror 1 and is provided with planoconvex lens 39, and holmium-praseodymium is mixed the optical alignment that fluoride ZBLAN optical fiber 8 exports by planoconvex lens 39 altogether; The second resonant cavity is formed between film plating layer 7 to speculum 13.Pumping source 25 is 1150nm continuous laser diode, pumping source 25 output light source sustainedly and stably, after light focusing to holmium-praseodymium mixes the film plating layer 7 of fluoride ZBLAN optical fiber 8 input altogether, produce 3 μm of light, 3 μm of light horizontal transmission are on dichroic mirror 1, speculum 13 is arrived through dichroic mirror 1, 3 μm of light reflex on dichroic mirror 1 by speculum in the horizontal direction, because dichroic mirror 1 tilts 45 ° to place relative to horizontal direction, a part 3 μm of light are vertically reflected on dichroic mirror 2 14, a part 3 μm of light continue in the horizontal direction through dichroic mirror 1, be projected to film plating layer 7, thus form the second resonant cavity of 3 μm of light, 3 μm of light roundtrip propagation in the second resonant cavity, the inverted population density of upper energy level constantly accumulates in a large number.By pumping source 25, what planoconvex lens 1 and holmium-praseodymium mixed that fluoride ZBLAN optical fiber 8 can be continual and steady altogether sends 3 μm of light, can form the second stable resonant cavity in conjunction with dichroic mirror 2 14, dichroic mirror 1 with speculum 13.
The transmissivity >99% of Fiber Bragg Grating FBG 2 pairs of 1550nm light, to 2 μm of light reflectance >99%; The transmissivity >99% of film plating layer 7 pairs of 1150nm light, to 3 μm of light reflectance >99%.The 1550nm light launched from pumping source 1 with high transmitance through Fiber Bragg Grating FBG 2, and again reflected back with high reflectance from 2 μm of light that speculum 13 reflects by Fiber Bragg Grating FBG 2, thus improve the operating efficiency of the first resonant cavity, significantly reduce loss; The 1150nm light launched from pumping source 25 with high transmitance through film plating layer 7, and again reflected back with high reflectance from 3 μm of light that speculum reflects by film plating layer 7, thus improve the operating efficiency of the second resonant cavity, significantly reduce loss.
Dichroic mirror one 10 couples of 1150nm light transmission >99%, to 1550nm light and 2 μm of equal >99% of light reflectivity, are 50% to 3 μm of light reflectivities and transmissivity; Dichroic mirror 2 14 couples of 1550nm light reflectance >99%, to 2 μm of light reflectivity=80%, transmissivity=20%, to 3 μm of light transmission >99%.When 1550nm light and 2 μm of light arrive dichroic mirror 1, all reflex on dichroic mirror 2 14 with high reflectance, 3 μm of light are when arriving dichroic mirror 1, and half is transmitted through dichroic mirror 1, half reflexes on dichroic mirror 2 14, and 1150nm light almost cannot through dichroic mirror 2 14; When 1550nm light and 3 μm of light arrive dichroic mirror 2 14, all reflex on dichroic mirror 1 with high reflectance, when 2 μm of light arrive dichroic mirror 2 14,2 μm of light of 80% are reflected, and 2 μm of energy transmissive of 20% cross dichroic mirror 2 14, form stable light path accurately.
Embodiment 2
As depicted in figs. 1 and 2, open pumping source 25, the 1150nm light that pumping source 25 is launched focuses to holmium-spectrum through planoconvex lens 1 and mixes on the film plating layer 7 of the input of ZBLAN optical fiber 8 altogether, produce 3 μm of light mix ZBLAN optical fiber 8 altogether output output from holmium-spectrum, 3 μm of light propagate on dichroic mirror 1 through planoconvex lens 39 collimation, 3 μm of light transmission dichroic mirrors 1, and be transmitted through planoconvex lens 4 11, propagated into by planoconvex lens 4 11 focusing and be covered with on the speculum 13 of graphene film layer 12, 3 μm of light are reflected in roundtrip propagation in the second resonant cavity through speculum 13, and the inverted population density of upper energy level accumulates in a large number, regulate the power of pumping source 25 to make 3 μm of luminous powers of mixing ZBLAN optical fiber 8 output from holmium-spectrum altogether lower, Graphene cannot be reached capacity state, and graphene film is in high loss (being namely in low reactance-resistance ratio) state, keep the operating state of pumping source 25, open pumping source 1, the 1550nm light that pumping source 1 is launched is by producing 2 μm of light after Fiber Bragg Grating FBG 2 and thulium-holmium co-doped fiber, 2 μm of light reflex to after dichroic mirror 1 through dichroic mirror 2 14, reflex to planoconvex lens 4 11, propagated into by planoconvex lens 4 11 focusing and be covered with on the speculum 13 of graphene film layer 12, 2 μm of light are reflected in roundtrip propagation in the first resonant cavity through speculum 13, and the inverted population density of upper energy level accumulates in a large number, increase the power output of pumping source 1 gradually, 2 μm of amplified spontaneous emission light strengthen gradually, along with Fiber Bragg Grating FBG 2 and holmium-spectrum mix the accumulation of particle inverted population in ZBLAN optical fiber 8 altogether, in resonant cavity, light intensity increases gradually, along with spontaneous radiation light intensity increases, the saturated absorption coefficient of graphene film reduces, continue to increase spontaneous radiation light intensity, when the saturated absorption light intensity of amplified spont-aneous emission light intensity and graphene film is comparable, graphene film absorbs the value that reaches capacity, suddenly by " bleaching ", absorption coefficient drops to minimum, 2 μm of Q impulse fiber laser stable output representative value pulse duration 490ns, repetition rate 80kHz, at 2 μm of flashlights by graphene film " bleaching ", when making its absorption coefficient drop to minimum rapidly, the inverted population of 2 μm and 3 μm accumulations is consumed at short notice, in two resonant cavitys, Q value is surged, produce laser generation and export peak power higher 2 μm and 3 μm of short pulses simultaneously, can realize the control just of double-wavelength pulse repetition rate by regulating pumping source 1 watt level, increase the power of pumping source 1, double-wavelength pulse repetition rate synchronously improves, reduce the power of pumping source 1, double-wavelength pulse repetition rate synchronously reduces.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: comprise the speculum (13) being covered with graphene film layer (12), described speculum (13) same level position is provided with dichroic mirror one (10), described dichroic mirror one (10) tilts 45 ° to arrange relative to horizontal direction, be provided with opposing parallel dichroic mirror two (14) directly over described dichroic mirror one (10), described dichroic mirror two (14) top is provided with pulse output end (15); Be provided with planoconvex lens four (11) between described dichroic mirror one (10) and speculum (13), light beam can be focused to speculum (13) by described planoconvex lens four (11); Described dichroic mirror one (10) is connected with 3 μm of light generation routes, and described dichroic mirror two (14) is connected with 2 μm of light generation routes, and described 3 μm of light generation routes and 2 μm of light generation routes parallel.
2. as claimed in claim 1 a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: described 2 μm of light generation routes comprise the pumping source one (1) connected in turn, Fiber Bragg Grating FBG (2) and thulium-holmium co-doped fiber (3), described thulium-be provided with planoconvex lens two (4) between holmium co-doped fiber (3) and dichroic mirror two (14), the optical alignment that thulium-holmium co-doped fiber (3) can export by described planoconvex lens two (4); Described Fiber Bragg Grating FBG (2) forms the first resonant cavity between speculum (13).
3. as claimed in claim 1 a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: 3 μm of light generation routes comprise pumping source two (5), planoconvex lens one (6) and holmium-praseodymium mix fluoride ZBLAN optical fiber (8) altogether, the light that pumping source two (5) is launched can be focused to the input that holmium-praseodymium mixes fluoride ZBLAN optical fiber (8) altogether by described planoconvex lens one (6), and the input end face that described holmium-praseodymium mixes fluoride ZBLAN optical fiber (8) is altogether provided with film plating layer (7); Described holmium-praseodymium is mixed altogether between fluoride ZBLAN optical fiber (8) and dichroic mirror one (10) and is provided with planoconvex lens three (9), and holmium-praseodymium can be mixed the optical alignment that fluoride ZBLAN optical fiber (8) exports by described planoconvex lens three (9) altogether; Described film plating layer (7) forms the second resonant cavity between speculum (13).
4. as claimed in claim 2 or claim 3 a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: described pumping source one (1) is 1550nm continuous laser diode, described pumping source two (5) is 1150nm continuous laser diode.
5. as claimed in claim 4 a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: described Fiber Bragg Grating FBG (2) to the transmissivity >99% of 1550nm light, to 2 μm of light reflectance >99%; Described film plating layer (7) to the transmissivity >99% of 1150nm light, to 3 μm of light reflectance >99%.
6. a kind of as described in claim 4 or 5 based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: described dichroic mirror one (10) is to 1150nm light transmission >99%, to 1550nm light and 2 μm of equal >99% of light reflectivity, 50% is to 3 μm of light reflectivities and transmissivity; Described dichroic mirror two (14) is to 1550nm light reflectance >99%, and to 2 μm of light reflectivity=80%, transmissivity=20%, to 3 μm of light transmission >99%.
7. as claimed in claim 2 or claim 3 a kind of based on infrared double-wave length in Graphene with repetition pulse optical fiber, it is characterized in that: the input of described thulium-holmium co-doped fiber (3) is set to vertical cut face, the output of described thulium-holmium co-doped fiber (3) is set to the scarf of 8 °.
8. in launching, infrared double-wave length is with a method for repetition pulse, it is characterized in that comprising the following steps:
Step one: open pumping source two (5), the 1150nm light that pumping source two (5) is launched focuses to holmium-spectrum through planoconvex lens one (6) and mixes on the film plating layer (7) of the input of ZBLAN optical fiber (8) altogether, produce 3 μm of light mix ZBLAN optical fiber (8) altogether output output from holmium-spectrum, 3 μm of light propagate on dichroic mirror one (10) through planoconvex lens three (9) collimation, 3 μm of light transmission dichroic mirrors one (10), and be transmitted through planoconvex lens four (11), focused on the speculum (13) propagating into and be covered with graphene film layer (12) by planoconvex lens four (11); 3 μm of light are reflected in roundtrip propagation in the second resonant cavity through speculum (13), and the inverted population density of upper energy level accumulates in a large number; Regulate the power of pumping source two (5) to make to mix from holmium-spectrum 3 μm of luminous powers that ZBLAN optical fiber (8) exports altogether lower, graphene film is in high loss (being namely in low reactance-resistance ratio) state;
Step 2: the operating state keeping pumping source two (5), open pumping source one (1), the 1550nm light that pumping source one (1) is launched is by producing 2 μm of light after Fiber Bragg Grating FBG (2) and thulium-holmium co-doped fiber, 2 μm of light reflex to after dichroic mirror one (10) through dichroic mirror two (14), reflex to planoconvex lens four (11), focused on by planoconvex lens four (11) on the speculum (13) propagating into and be covered with graphene film layer (12); 2 μm of light are reflected in roundtrip propagation in the first resonant cavity through speculum (13), and the inverted population density of upper energy level accumulates in a large number;
Step 3: the power output increasing pumping source one (1) gradually, amplifies 2 μm of spontaneous emission lights; Along with Fiber Bragg Grating FBG (2) and holmium-spectrum mix the accumulation of inverted population in ZBLAN optical fiber (8) altogether, in resonant cavity, light intensity increases gradually, along with spontaneous radiation light intensity increases, the saturated absorption coefficient of graphene film reduces, continue to increase spontaneous radiation light intensity, the absorption of graphene film is reached capacity, the inverted population of accumulation is consumed at short notice, in resonant cavity, Q value is surged, and produces laser generation and exports peak power higher 2 μm and 3 μm of pulses from output (15) simultaneously;
Step 4: the operating state keeping now pumping source one (1) and pumping source two (5), population approach exhaustion to be reversed, graphene film returns to high loss state within the relaxation time, under this operating state of pumping source one (1) and pumping source two (5), in two gain fibres, inverted population is accumulated again, reaches the saturation value of Graphene, output dual wavelength pulse again, repetition like this, realizes 2 μm and 3 μm of Q impulses of same repetition.
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