CN203722048U - Optic fiber reflection-type graphene passively Q-switched mode-locked laser - Google Patents
Optic fiber reflection-type graphene passively Q-switched mode-locked laser Download PDFInfo
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- CN203722048U CN203722048U CN201420011833.3U CN201420011833U CN203722048U CN 203722048 U CN203722048 U CN 203722048U CN 201420011833 U CN201420011833 U CN 201420011833U CN 203722048 U CN203722048 U CN 203722048U
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- 239000000835 fiber Substances 0.000 title claims abstract description 64
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 32
- 230000010287 polarization Effects 0.000 claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 239000005304 optical glass Substances 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 239000004038 photonic crystal Substances 0.000 claims description 15
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 abstract description 9
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- 238000005516 engineering process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000001237 Raman spectrum Methods 0.000 description 2
- 230000009514 concussion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000007773 growth pattern Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides an optic fiber reflection-type graphene passively Q-switched mode-locked laser and relates to the technical field of lasers. The objective of the utility model is to solve the problems of high non linearity as well as poor mode locking quality and stability of an existing device. The optic fiber reflection-type graphene passively Q-switched mode-locked laser of the utility model comprises a pump light source, an optical glass mirror, a gain optical fiber and a saturable absorber mirror, wherein the optical glass mirror is composed of a first plano-convex lens, a second plano-convex lens, a third plano-convex lens and a fourth plano-convex lens; the optic fiber reflection-type graphene passively Q-switched mode-locked laser further comprises a first dichroscope, a beam splitter and a polarization control element assembly; and the pump light source, the first plano-convex lens, the first dichroscope, the second plano-convex lens, the gain optical fiber, the third plano-convex lens, the beam splitter, the polarization control element, the fourth plano-convex lens and the saturable absorber mirror are connected with one another sequentially according to the order of optical fibers. With the optic fiber reflection-type graphene passively Q-switched mode-locked laser adopted, the problem of high non linearity can be solved. The optic fiber reflection-type graphene passively Q-switched mode-locked laser is advantageous in simple structure, small size and better stability.
Description
Technical field
The utility model relates to laser technology field, particularly relates to the passive Q-adjusted mode-locked laser of a kind of fiber reflection formula Graphene.
Background technology
Optical fiber mode locked laser is compared the advantage such as have compact conformation, pulse stability is good, threshold value is low with common solid mode-locked laser.In recent years, along with the development of fibre-optical drawing technology and optical fibre device manufacture craft, optical fiber mode locked laser has obtained fast development.At present, that in optical fiber mode locked laser, be widely used as saturable absorber is SESAM, i.e. semiconductor saturable absorbing mirror.SESAM as saturable absorber have good reliability, stability high, easily realize the advantages such as Mode-locking For Lasers self-starting.But the problem such as complex process, cost are high, easy damaged that SESAM exists.
Graphene, after within 2004, being prepared first, finds after deliberation, and it has very unique electrical properties and nonlinear optics saturated absorption characteristic as saturable absorber.And Graphene saturated absorbing body compares with SESAM that to have growth pattern simple, the advantage that cost of manufacture is low.At present, both at home and abroad seminar has carried out a series of research work to usining Graphene as the optical fiber mode locked laser of saturable absorber.2010, the people such as Z.Sun be take Er-doped fiber as gain media, and Graphene is saturated absorbing body, utilized ring cavity structure to obtain centre wavelength for 1560nm, and spectrum width is 5.2nm, the continuous locking mold Laser output that pulsewidth is 500fs.In the same year, the people such as L.M.Zhao be take Yb dosed optical fiber as gain media, and multi-layer graphene is saturated absorbing body, utilize ring cavity structure to realize continuous locking mold Laser output, its centre wavelength is 1069.8nm, and pulsewidth is 580ps, average output power is 0.37mW, and repetition is 0.9MHz.2011, the people such as J.Liu made gain media with Double Cladding Ytterbium Doped Fiber, and Graphene is saturable absorber, utilized ring cavity structure to obtain pulse duration for 680ps, and repetition is 1.04MHz, the Q-switch and mode-locking Laser output that single pulse energy is 163nJ.2012, the people such as X.He utilized Er-doped fiber, Graphene and Fiber Bragg Grating FBG to build annular chamber, had realized the tunable continuous locking mold Laser output of wave-length coverage at 1539.4-1546nm.In the same year, the people such as Wang Guanghui adopt ring cavity structure, utilize Graphene as saturable absorber, realized average output power 1.07mW, repetition rate 3.16MHz, pulsewidth is about the mode locking pulse of 1.32ps, and laser center wavelength is adjustable between 1556.72～1558.76nm.
The gain fibre adopting in above research work is all common single mode doped fibers.Because the little fibre core area of general single mode fiber can produce strong nonlinear effect (as SPM etc.) under high peak power, bring larger nonlinear phase shift to cause pulse division, thereby the single pulse energy of impact output, the further raising of peak power, the even stability of output.And photonic crystal fiber is due to its unique leaded light mechanism, flexible and changeable structure with enrich unique superior function, for new thinking has been opened up in the development of various optical fibre devices and technology, can solve an insurmountable difficult problem in ordinary optic fibre laser.Adopt big mode field area photonic crystal fiber to overcome the high non-linearity that conventional single mode fiber causes due to little core structure, and then the further problem improving of Limited Pulses energy (as too much non-linear meeting produces pulse division); And compare with common large mould area double-cladding optical fiber, photonic crystal fiber also can keep single-mode output when core diameter increases, when reducing nonlinear effect, while also having avoided locked mode, there is coupling influence quality of mode-locked between high-rder mode and pattern and the problem of stability.So the big mode field area unimodular property that photonic crystal fiber has, makes laser can realize the single mode running in high power situation, this is the key that optical fiber mode locked laser can be realized high-energy output.
Utility model content
For the weak point existing in the problems referred to above, the utility model provides a kind of fiber reflection formula Graphene passive Q-adjusted mode-locked laser, makes it overcome high non-linearity, and simple in structure, space is small and exquisite, stability is better.
In order to address the above problem, the utility model provides a kind of fiber reflection formula Graphene passive Q-adjusted mode-locked laser, comprise pump light source, optical glass mirror, gain fibre and saturated absorption mirror, described optical glass mirror is by the first planoconvex spotlight, the second planoconvex spotlight, the 3rd planoconvex spotlight, Siping City's convex lens form, wherein, also comprise the first dichroscope, beam splitter and polarization control component group, described pump light source, described the first planoconvex spotlight, described the first dichroscope, described the second planoconvex spotlight, described gain fibre, described the 3rd planoconvex spotlight, described beam splitter, described polarization control component group, described Siping City convex lens are connected by optical fiber order successively with described saturated absorption mirror.
Preferably, described beam splitter comprises the second dichroscope and the 3rd dichroscope of parallel placement, and described beam splitter adopts collapsible linear structure design effectively the laser of circulation concussion and pump light to be separated, and reduces the interference of stray light.
Preferably, described polarization control component group comprises the first polarization beam apparatus, half-wave plate, the second polarization beam apparatus, described the first polarization beam apparatus, described half-wave plate are connected according to optical fiber order successively with described the second polarization beam apparatus, the polarization state of described the first polarization beam apparatus control chamber inner laser, described half-wave plate and described the second polarization beam apparatus are controlled the size of Laser output.
Preferably, the output of described pump light source is connected with the input of described the first planoconvex spotlight, pump light enters in described gain fibre after collimation-focusing coupling, makes described gain fibre have sufficient absorption to described pump light, and described pump light source is 976nm fiber laser.
Preferably, described gain fibre is the photonic crystal fiber with the airport array that hexagon periodically arranges, and it adopts welding mode to be connected with described the second planoconvex spotlight, described the 3rd planoconvex spotlight; Described gain fibre adopts the heat method of subsiding that the air zone at distance described gain fibre both ends of the surface 0.5mm place is subsided, and to described both ends of the surface all with 8 ° of oblique angle polishings, avoided the self-oscillation of described both ends of the surface feedback formation.
Preferably, described saturated absorption mirror adopts the Graphene preparation with saturable absorption characteristic, and thickness is 6-8 layer.
Compared with prior art, the utlity model has following advantage:
The utility model combines the photonic crystal fiber and the novel lock mold materials Graphene saturable absorber that are different from traditional fiber, design collapsible linear standing-wave cavity, build the multi-functional optical experimental device that whole light path is free space, not only overcome the high non-linearity that apparatus structure causes, and obtained simple in structure, space is small and exquisite, the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene of good stability.
Accompanying drawing explanation
Fig. 1 is example structure schematic block diagram of the present utility model;
Fig. 2 is the Raman spectrum schematic diagram of embodiment of the present utility model.
Main element symbol description:
1-pump light source 2-first planoconvex spotlight 3-the first dichroscope
4-the second planoconvex spotlight 5-photonic crystal fiber 6-the 3rd planoconvex spotlight
7-second dichroscope 8-the 3rd dichroscope 9-the first polarization beam apparatus
10-half-wave plate 11-second polarization beam apparatus 12-Siping City convex lens
13-saturated absorption mirror
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and example, the utility model is described in further detail, but example is not as to restriction of the present utility model.
As shown in Figure 1, embodiment of the present utility model comprises pump light source 1, optical glass mirror, gain fibre and saturated absorption mirror 13, optical glass mirror is by the first planoconvex spotlight 2, the second planoconvex spotlight 4, the 3rd planoconvex spotlight 6, Siping City's convex lens 12 form, wherein, also comprise the first dichroscope 3, beam splitter and polarization control component group, pump light source 1, the first planoconvex spotlight 2, the first dichroscope 3, the second planoconvex spotlight 4, gain fibre, the 3rd planoconvex spotlight 6, beam splitter, polarization control component group, Siping City's convex lens 12 are connected by optical fiber order successively with saturated absorption mirror 13.
Beam splitter comprises the second dichroscope 7 and the 3rd dichroscope 8 of parallel placement, and beam splitter adopts the design of collapsible linear structure effectively by the laser of circulation concussion and pump light separately, guarantees to only have laser generation, and without the interference of pump light.
Polarization control component group comprises the first polarization beam apparatus 9, half-wave plate 10, the second polarization beam apparatus 11, the first polarization beam apparatus 9, half-wave plate 10 are connected according to optical fiber order successively with the second polarization beam apparatus 11, the polarization state of the first polarization beam apparatus 9 control chamber inner lasers, half-wave plate 10 and the second polarization beam apparatus 11 are controlled the size of Laser output.
The output of pump light source 1 is connected with the input of the first planoconvex spotlight 2, pump light enters photonic crystal fiber 5 inner claddings through collimation-focus on coupling is laggard, coupling efficiency is greater than 80%, make 5 pairs of pump lights of photonic crystal fiber have sufficient absorption, pump light source 1 is 976nm fiber laser, and the maximum of 976nm fiber laser is output as 29.5W(I=44A).
Gain fibre adopts inner cladding 170 μ m, numerical aperture 0.62, and core diameter is the photonic crystal fiber 5 of 40 μ m, numerical aperture 0.03, and mode field area is about 660 μ m
2, fiber lengths 2m, has the airport array that hexangle type is periodically arranged.The absorption coefficient of 5 pairs of 976nm pump lights of this photonic crystal fiber is 13dB/m.For improve pump light and flashlight coupling efficiency, avoid fiber end face damage, pollute, photonic crystal fiber 5 adopts the hot method of subsiding to make to subside apart from the air zone at gain fibre both ends of the surface 0.5mm place, and to both ends of the surface all with 8 ° of oblique angle polishings, the self-oscillation of having avoided both ends of the surface feedback to form affects the performance of tunable laser.Fiber end face grinding, polishing work are completed by a set of effective scheme of developing voluntarily, have reduced to greatest extent cavity loss.
Whole laser oscillation system is the passive Q-adjusted mode-locked laser of the above fiber reflection formula Graphene.In oscillator stage, pump light is coupled into the inner cladding of photonic crystal fiber 5 through the first planoconvex spotlight 2 of 1:1 and collimation-focusing coupled system of the second planoconvex spotlight 4 compositions, 5 pairs of pump lights of photonic crystal fiber have after sufficient absorption, output light is through the 3rd planoconvex spotlight 6 collimations, via passing through successively the first polarization beam apparatus 9, half-wave plate 10, the second polarization beam apparatus 11 after the second dichroscope 7 and the 3rd dichroscope 8 turnovers, Jing Siping City convex lens 12 focus on the multi-layer graphene saturable absorbing mirror 13 as Effect of Back-Cavity Mirror, thereby complete a laser generation.First polarization beam apparatus 9 here plays the effect of control chamber inner laser polarization state, half-wave plate 10 and the second polarization beam apparatus 11 are used for controlling the size of Laser output, because changed in rotation half-wave plate from the first polarization beam apparatus 9 output polarisation of light directions, such the first polarization beam apparatus 9 and the second polarization beam apparatus 11 separately angle between polarization direction can change, thereby control the size of output light, and effectively utilize the dichroism of the second polarization beam apparatus 11, make it to meet the circulation vibration of endovenous laser, can laser be derived by the escape window of its side again, more flexible in structure.The Q-switch and mode-locking laser forming is the most at last from the side direction escape window output of the second polarization beam apparatus 11.Utilize Siping City's convex lens 12 of focal length 8mm to focus on, by changing the size of focused light spot, obtain the required power density of startup locked mode.When pump power 10W, realize the output of 24mW continuous light.During pump power 10.8W, realize Q-switch and mode-locking, power output 45mW.When pump power 12W, maximum power output 115mW.When laser occurs after Q-switch and mode-locking state, along with the increase of pump power, power output is almost linear growth, tiltedly efficiency 45.6%.
As shown in Figure 2, saturated absorption mirror 13 adopts the Graphene preparation with saturable absorption characteristic, and thickness is 6-8 layer.Its Raman spectrum is as shown in the figure: at 1332 (D peaks) and 1580 (G peak) cm
-1occur two peaks, D peak intensity almost can be ignored, and shows that Graphene has very high quality.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the utility model.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene, comprise pump light source, optical glass mirror, gain fibre and saturated absorption mirror, described optical glass mirror is by the first planoconvex spotlight, the second planoconvex spotlight, the 3rd planoconvex spotlight, Siping City's convex lens form, it is characterized in that, also comprise the first dichroscope, beam splitter and polarization control component group, described pump light source, described the first planoconvex spotlight, described the first dichroscope, described the second planoconvex spotlight, described gain fibre, described the 3rd planoconvex spotlight, described beam splitter, described polarization control component group, described Siping City convex lens are connected by optical fiber order successively with described saturated absorption mirror.
2. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene as claimed in claim 1, is characterized in that, described beam splitter comprises the second dichroscope and the 3rd dichroscope of parallel placement, and described beam splitter adopts collapsible linear structure design.
3. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene as claimed in claim 2, it is characterized in that, described polarization control component group comprises the first polarization beam apparatus, half-wave plate, the second polarization beam apparatus, and described the first polarization beam apparatus, described half-wave plate are connected according to optical fiber order successively with described the second polarization beam apparatus.
4. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene as claimed in claim 3, is characterized in that, the output of described pump light source is connected with the input of described the first planoconvex spotlight, and described pump light source is 976nm fiber laser.
5. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene as claimed in claim 4, it is characterized in that, described gain fibre is the photonic crystal fiber with the airport array that hexagon periodically arranges, and it adopts welding mode to be connected with described the second planoconvex spotlight, described the 3rd planoconvex spotlight.
6. the passive Q-adjusted mode-locked laser of fiber reflection formula Graphene as described in as arbitrary in claim 1-5, is characterized in that, described saturated absorption mirror adopts the Graphene preparation with saturable absorption characteristic, and thickness is 6-8 layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420011833.3U CN203722048U (en) | 2014-01-08 | 2014-01-08 | Optic fiber reflection-type graphene passively Q-switched mode-locked laser |
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| CN201420011833.3U CN203722048U (en) | 2014-01-08 | 2014-01-08 | Optic fiber reflection-type graphene passively Q-switched mode-locked laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730823A (en) * | 2014-01-08 | 2014-04-16 | 北京工业大学 | Optical reflection type graphene passively Q-switched mode locked laser |
| CN105633788A (en) * | 2016-03-21 | 2016-06-01 | 电子科技大学 | Graphene-based Q-switched pulse fiber narrow line-width laser |
-
2014
- 2014-01-08 CN CN201420011833.3U patent/CN203722048U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730823A (en) * | 2014-01-08 | 2014-04-16 | 北京工业大学 | Optical reflection type graphene passively Q-switched mode locked laser |
| CN105633788A (en) * | 2016-03-21 | 2016-06-01 | 电子科技大学 | Graphene-based Q-switched pulse fiber narrow line-width laser |
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Granted publication date: 20140716 |