CN105720461A - 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser - Google Patents
2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser Download PDFInfo
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Abstract
The invention discloses a 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, and belongs to the field of laser techniques and non-linear optics. The 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser mainly comprises a laser pumping source, a wavelength division multiplexer, thulium-holmium codoped optical fiber, a circulator, an isolator, a saturable absorber, a saturable absorber mirror, a coupler, a polarization controller, a filter, passive optical fiber, and the like. As the thulium-holmium codoped optical fiber is taken as a gain medium and the saturable absorber and the saturable absorber mirror as passive mode-locking devices, and furthermore by changing the penetration wavelength of the tunable filter, output of 2-micro wave band, tunable wavelength and short pulse is achieved. Due to adoption of the whole structure of the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, all-fiber welding is achieved, and the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser has the advantages of simple structure, good environment stability, high efficiency and the like, and is easy in industrial application.
Description
Technical field
The present invention relates to fiber laser technology field, particularly a kind of 2 tunable thulium holmiums of micron waveband are co-doped with mode-locked all-fiber laser.
Background technology
Optical fiber laser is the laser instrument using the optical fiber of doped with rare-earth elements as gain media, by different rare earth elements such as erbium doped, ytterbium, thulium, holmiums, it is possible to make the service band of optical fiber laser cover middle-infrared band.Compared with semiconductor laser, optical fiber laser has that volume is little, threshold value is low, efficiency is high, good beam quality, without adjusting the advantages such as light path.Wherein, 2 micron optical fiber laser instrument, owing to its output wavelength is close to the absworption peak of hydroxyl H-O, are in safety range of human eye, so having important prospect in fields such as laser surgery, laser radar, ultra-fast optical.In recent years, along with the correlational study of optical fiber laser deepens continuously, the application in fields such as industry, medical science, communications of the 2 micron optical fiber laser instrument is more and more extensive.But, the 2 present most of only one of which centre wavelengths of micron optical fiber laser instrument, and pumping efficiency is relatively low, so will increase operation cost and the backup cost of system, and tunable thulium holmium is co-doped with mode-locked all-fiber laser and can realize replacing with a tunable optical fiber laser optical fiber laser of multiple fixed wave length, simultaneously, using Tm Ho co doped fiber also to have Low threshold, pumping efficiency high as gain media, this kind of tunable optical fiber laser can also as the seed source of tunable high-power optical fiber laser instrument.
Summary of the invention
It is an object of the invention to solve Problems existing in optical fiber laser mentioned above, it is proposed that a kind of 2 tunable thulium holmiums of micron waveband are co-doped with mode-locked all-fiber laser.The present invention utilizes Tm Ho co doped fiber as gain media, saturable absorber or saturable absorbing mirror as passive mode-locking device, again through change tunable bandpass filters through wavelength, it is achieved that the output of 2 micron wavebands, tunable wave length, short pulse punching.It is an advantage of the current invention that total achieves all-fiber welding, there is the advantages such as simple in construction, environmental stability are good, it is easy to accomplish commercial application.Technical scheme is as follows:
A kind of 2 tunable thulium holmiums of micron waveband are co-doped with mode-locked all-fiber laser, comprising: for produce laser laser pumping source, for pumping laser being coupled to wavelength division multiplexer in the middle of annular chamber, be used for producing the Tm Ho co doped fiber of 2 mum laser, be used for adjusting the Polarization Controller of polarization, be used for the passive mode-locking device of locked mode, be used for selecting the wave filter of Output of laser wavelength and be used for the bonder that power is allocated；Wherein
Described laser pumping source connects the pumping input of wavelength division multiplexer, the beam port that closes of wavelength division multiplexer connects one end of Tm Ho co doped fiber, the other end of Tm Ho co doped fiber connects the input of Polarization Controller, the outfan of Polarization Controller connects the input of passive mode-locking device, the outfan of passive mode-locking device connects the input of wave filter, the outfan of wave filter is connected with the input of bonder, the outfan of bonder has two-way, one tunnel is as the outfan of mode-locked ultrashort pulse laser pulse, another road is connected with the signal end of wavelength division multiplexer, wherein it is attached each through passive fiber between each parts.
Further, described passive mode-locking device includes: for saturable absorber or the saturable absorbing mirror of locked mode, when passive mode-locking device is saturable absorber, is additionally provided with isolator between described saturable absorber and wave filter；When passive mode-locking device is saturable absorbing mirror, it is additionally provided with circulator between described Polarization Controller and wave filter, the outfan of Polarization Controller connects the input of circulator, and the outfan of circulator connects the input of wave filter, and saturable absorbing mirror is positioned at the position of circulator common port.
Further, what the described passive fiber connecting all parts adopted is the of the same race passive fiber being specifically designed to 2 microns of light of propagation, and all adopts the mode that fibre core aligns directly fused together between each parts.
Further, described Tm Ho co doped fiber be single mode list covering Tm Ho co doped fiber as gain media, the core diameter of single mode list covering Tm Ho co doped fiber is 9 μm, and cladding diameter is 125 μm, and numerical aperture is 0.16.
Further, the degree of regulation of described wave filter is 0.01nm, and tuning range is between 1750nm-2100nm, and fiber coupler adopts 1*2 structure, splitting ratio to be 30:70.
Further, described laser pumping source is semiconductor laser, optical fiber laser or Raman fiber lasers, wherein, the centre wavelength of semiconductor laser Output of laser is between 700-900nm, and the centre wavelength of optical fiber laser and Raman fiber lasers Output of laser is between 1050-1300nm or between 1500-1700nm.
Further, described saturable absorbing mirror is the one in semiconductor saturable absorbing mirror, CNT saturable absorbing mirror, Graphene saturable absorbing mirror, graphene oxide saturable absorbing mirror and topological insulator saturable absorbing mirror.
Further, described saturable absorber is the one in semiconductor saturable absorber, CNT saturable absorber, Graphene saturable absorber, graphene oxide saturable absorber and topological insulator saturable absorber.
Advantages of the present invention and having the beneficial effect that:
1, it is an advantage of the current invention that to be undertaken the selection of Output of laser wavelength by regulating wave filter, achieve the tunable of 2 micron waveband shorter pulse length, the shortcoming solving traditional 2 most of only one of which centre wavelengths of micron optical fiber laser instrument, reduces operation cost and the backup cost of system.
2, for singly mixing Ho3+System, owing to radiationless transition occupies leading position, laser generation efficiency is relatively low, and the present invention adopts Tm Ho co doped fiber as gain media, by the Tm of high concentration3+With Ho3+It is co-doped with, so can obtain the theoretical pumping quantum efficiency of 200%, so that conversion efficiency is greatly improved.
3, in the present invention passive fiber of connecting components adopt be the of the same race passive fiber being specifically designed to and propagating 2 microns of light so that light loss in the air is substantially reduced.
What 4, total of the present invention adopted is that the mode that fibre core aligns is directly fused together, has the advantages such as loss is low, simple in construction, environmental stability are good, it is easy to accomplish commercial application.
Accompanying drawing explanation
Fig. 1 is that the present invention provides preferred embodiment theory structure schematic diagram.
Fig. 2 is the theory structure schematic diagram of embodiment 2.
Fig. 3 is the absorption spectrum schematic diagram of Tm Ho co doped fiber.
Fig. 4 is the emission spectrum schematic diagram of Tm Ho co doped fiber.
Labelling in figure: 1, laser pumping source, 2, wavelength division multiplexer, 3, Tm Ho co doped fiber, 4, Polarization Controller, 5, circulator, 6, saturable absorbing mirror, 7, wave filter, 8, bonder, 9, passive fiber, 10, isolator, 11, saturable absorber.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As it is shown in figure 1, embodiment 1
A kind of 2 tunable thulium holmiums of micron waveband are co-doped with mode-locked all-fiber laser and adopt ring cavity structure as shown in Figure 1, specifically include that centre wavelength 1570nm, output 1W single mode erbium-ytterbium co-doped fiber laser instrument as laser pumping source 1；1570/2000nm wavelength division multiplexer 2 as pump light bundling device；The single mode list covering Tm Ho co doped fiber 3 of 3m length is as gain media, the core diameter of single mode list covering Tm Ho co doped fiber 3 is 9 μm, cladding diameter is 125 μm, numerical aperture is 0.16, wherein, Fig. 3 is the absorption spectrum schematic diagram of Tm Ho co doped fiber, and Fig. 4 is the emission spectrum schematic diagram of Tm Ho co doped fiber；Three ring Polarization Controllers 4；Three fiber port circulators 5；Modulation depth is the semiconductor saturable absorbing mirror 6 of 20%；Tunable band filter 7, its degree of regulation is 0.01nm, and tuning range is between 1750nm-2100nm；1*2 structure, splitting ratio are the fiber coupler 8 of 30:70；SM-1950 passive fiber 9.Wherein: centre wavelength is 1570nm, output be the single mode erbium-ytterbium co-doped fiber laser instrument 1 of 1W connect 1570 the pumping input of 2000nm wavelength division multiplexer 2；1570 the beam port that closes of 2000nm wavelength division multiplexer 2 connect one end of single mode list covering Tm Ho co doped fiber 3 of 3m length；The other end of single mode list covering Tm Ho co doped fiber 3 connects the input of three ring Polarization Controllers 4, and the outfan of three ring Polarization Controllers 4 connects the input of three port circulators 5；Due to light can only unidirectional sequence by three ports of circulator 5, thus light is entered by the input of optical fiber circulator 5, light after the common port of optical fiber circulator 5 through semiconductor saturable absorbing mirror 6, the light reflected through semiconductor saturable absorbing mirror 6 from the common port of optical fiber circulator 5 out, then exports from the outfan of optical fiber circulator 5 by the direction of unidirectional sequence；The light of optical fiber circulator 5 output enters tunable bandpass filters 7, carries out wavelength selection；Input through the fibre-coupled mirrors 8 that light entrance splitting ratio is 30:70 that wavelength selects, light is divided into two bundles by fiber coupler 8, the light of 70% is exported by the outfan of fiber coupler 8, the light of other 30% to 1570 the signal end of 2000nm wavelength division multiplexer 2, connect each through SM-1950 passive fiber 9 between all parts.The single mode list covering Tm Ho co doped fiber 3 of 3m length as gain media, semiconductor saturable absorbing mirror 6 as passive mode-locking device, again through change tunable bandpass filters 7 through wavelength, it is achieved that the output of 2 micron wavebands, tunable wave length, short pulse punching.
Embodiment 2
A kind of 2 tunable thulium holmiums of micron waveband are co-doped with mode-locked all-fiber laser and adopt ring cavity structure as shown in Figure 2, specifically include that centre wavelength 1212nm, output 500mW Raman fiber lasers as laser pumping source 1；1212/2000nm wavelength division multiplexer 2 as pump light bundling device；The single mode list covering Tm Ho co doped fiber 3 of 50cm length is as gain media, the core diameter of single mode list covering Tm Ho co doped fiber 3 is 9 μm, cladding diameter is 125 μm, numerical aperture is 0.16, wherein, Fig. 3 is the absorption spectrum schematic diagram of Tm Ho co doped fiber, and Fig. 4 is the emission spectrum schematic diagram of Tm Ho co doped fiber；Three ring Polarization Controllers 4；Fibre optic isolater 10；The topological insulator saturable absorber 11 of transmission-type structure；Tunable bandpass filters 7, its degree of regulation is 0.01nm, and tuning range is between 1750nm-2100nm；1*2 structure, splitting ratio are the fiber coupler 8 of 50:50；SM-2000 passive fiber.Wherein: centre wavelength is 1212nm, output be the Raman fiber lasers l of 500mW connect 1212 the pumping input of 2000nm wavelength division multiplexer 2；1212 the beam port that closes of 2000nm wavelength division multiplexer 2 connect one end of single mode list covering Tm Ho co doped fiber 3 of 50cm length；The other end of single mode list covering Tm Ho co doped fiber 3 connects the input of three ring Polarization Controllers 4, the outfan of three ring Polarization Controllers 4 connects the input of isolator 10, topological insulator saturable absorber 11 is between isolator 10 and tunable bandpass filters 7, and tunable bandpass filters 7 is for the selection of wavelength；Input through the fiber coupler 10 that light entrance splitting ratio is 50:50 that wavelength selects, light is divided into two bundles by fiber coupler 10, the light of 50% is exported by the outfan of fiber coupler 10, the light of other 50% enter 1212 the signal end of 2000nm wavelength division multiplexer 2, connect each through SM-2000 passive fiber 9 between all parts.The single mode list covering Tm Ho co doped fiber 3 of 50cm length is as gain media, topological insulator saturable absorber 10 is as passive mode-locking device, again through change tunable bandpass filters 7 through wavelength, it is achieved that the output of 2 micron wavebands, tunable wave length, short pulse punching.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limiting the scope of the invention.After having read the content of record of the present invention, the present invention can be made various changes or modifications by technical staff, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (8)
1. the tunable thulium holmium of micron waveband is co-doped with mode-locked all-fiber laser, it is characterized in that, including: for producing the laser pumping source (1) of laser, for pumping laser being coupled to wavelength division multiplexer (2) in the middle of annular chamber, for producing the Tm Ho co doped fiber (3) of 2 mum laser, for adjusting the Polarization Controller (4) of polarization, for the passive mode-locking device of locked mode, for selecting the wave filter (7) of Output of laser wavelength and the bonder (8) for power is allocated；Wherein
Described laser pumping source (1) connects the pumping input of wavelength division multiplexer (2), the conjunction beam port of wavelength division multiplexer (2) connects one end of Tm Ho co doped fiber (3), the other end of Tm Ho co doped fiber (3) connects the input of Polarization Controller (4), the outfan of Polarization Controller (4) connects the input of passive mode-locking device, the outfan of passive mode-locking device connects the input of wave filter (7), the outfan of wave filter (7) is connected with the input of bonder (8), the outfan of bonder (8) has two-way, one tunnel is as the outfan of mode-locked ultrashort pulse laser pulse, another road is connected with the signal end of wavelength division multiplexer (2), wherein it is attached each through passive fiber (9) between each parts.
2. the 2 tunable thulium holmiums of micron waveband according to claim 1 are co-doped with mode-locked all-fiber laser, it is characterized in that, described passive mode-locking device includes: for saturable absorber (11) or the saturable absorbing mirror (6) of locked mode, when passive mode-locking device is saturable absorber (11), between described saturable absorber (11) and wave filter (7), it is additionally provided with isolator (10)；When passive mode-locking device is saturable absorbing mirror (6), circulator (5) it is additionally provided with between described Polarization Controller (4) and wave filter (7), the outfan of Polarization Controller (4) connects the input of circulator (5), the outfan of circulator (5) connects the input of wave filter (7), and saturable absorbing mirror (6) is positioned at the position of circulator (5) common port.
3. the 2 tunable thulium holmiums of micron waveband according to claim 1 and 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, what the described passive fiber (9) connecting all parts adopted is the of the same race passive fiber being specifically designed to 2 microns of light of propagation, and all adopts the mode that fibre core aligns directly fused together between each parts.
4. the 2 tunable thulium holmiums of micron waveband according to claim 1 and 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, described Tm Ho co doped fiber (3) for single mode list covering Tm Ho co doped fiber as gain media, the core diameter of single mode list covering Tm Ho co doped fiber (3) is 9 μm, cladding diameter is 125 μm, and numerical aperture is 0.16.
5. the 2 tunable thulium holmiums of micron waveband according to claim 1 and 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, the degree of regulation of described wave filter (7) is 0.01nm, tuning range is between 1750nm-2100nm, and fiber coupler (8) adopts 1*2 structure, splitting ratio to be 30:70.
6. the 2 tunable thulium holmiums of micron waveband according to claim 1 and 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, described laser pumping source (1) is semiconductor laser, optical fiber laser or Raman fiber lasers, wherein, the centre wavelength of semiconductor laser Output of laser is between 700-900nm, and the centre wavelength of optical fiber laser and Raman fiber lasers Output of laser is between 1050-1300nm or between 1500-1700nm.
7. the 2 tunable thulium holmiums of micron waveband according to claim 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, described saturable absorbing mirror (6) is semiconductor saturable absorbing mirror, one in CNT saturable absorbing mirror, Graphene saturable absorbing mirror, graphene oxide saturable absorbing mirror and topological insulator saturable absorbing mirror.
8. the 2 tunable thulium holmiums of micron waveband according to claim 2 are co-doped with mode-locked all-fiber laser, it is characterized in that, described saturable absorber (11) is semiconductor saturable absorber, one in CNT saturable absorber, Graphene saturable absorber, graphene oxide saturable absorber and topological insulator saturable absorber.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106936065A (en) * | 2017-04-27 | 2017-07-07 | 西安石油大学 | Carboxylated graphene oxide saturable absorber device and preparation method thereof and its application in optical fiber laser |
| CN108390251A (en) * | 2018-02-06 | 2018-08-10 | 哈尔滨工程大学 | A kind of holmium ytterbium is co-doped with microballoon cavity laser and preparation method |
| CN109301683A (en) * | 2018-10-09 | 2019-02-01 | 佛山科学技术学院 | The method that the compound cavity optical fibre laser of high-energy and pulse controllably induce excitation |
| CN110994340A (en) * | 2019-10-22 | 2020-04-10 | 重庆邮电大学 | 2-micron double-cone filtering tunable mode-locked fiber laser |
| CN112448257A (en) * | 2019-09-02 | 2021-03-05 | 中国科学院福建物质结构研究所 | Q-switched holmium laser |
| CN113314928A (en) * | 2021-04-19 | 2021-08-27 | 中国科学院福建物质结构研究所 | High repetition frequency 1.55 mu m all-fiber pulse laser |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
| US20220181837A1 (en) * | 2020-12-09 | 2022-06-09 | Cybel, LLC. | Polarization-Maintaining Fiber Laser Tunable Over Two Micron Region |
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Cited By (9)
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| CN106936065A (en) * | 2017-04-27 | 2017-07-07 | 西安石油大学 | Carboxylated graphene oxide saturable absorber device and preparation method thereof and its application in optical fiber laser |
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| CN112448257A (en) * | 2019-09-02 | 2021-03-05 | 中国科学院福建物质结构研究所 | Q-switched holmium laser |
| CN110994340A (en) * | 2019-10-22 | 2020-04-10 | 重庆邮电大学 | 2-micron double-cone filtering tunable mode-locked fiber laser |
| US20220181837A1 (en) * | 2020-12-09 | 2022-06-09 | Cybel, LLC. | Polarization-Maintaining Fiber Laser Tunable Over Two Micron Region |
| CN113314928A (en) * | 2021-04-19 | 2021-08-27 | 中国科学院福建物质结构研究所 | High repetition frequency 1.55 mu m all-fiber pulse laser |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
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