CN100589295C - Seed laser injection type single mode laser of active optical fiber rod - Google Patents
Seed laser injection type single mode laser of active optical fiber rod Download PDFInfo
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- CN100589295C CN100589295C CN200810118082A CN200810118082A CN100589295C CN 100589295 C CN100589295 C CN 100589295C CN 200810118082 A CN200810118082 A CN 200810118082A CN 200810118082 A CN200810118082 A CN 200810118082A CN 100589295 C CN100589295 C CN 100589295C
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Abstract
The invention discloses a seed laser injection active optical fiber rod single-mode laser. The laser comprises a pumping source (2), a single-mode seed fiber laser (1), a rare earth ion-doped opticalfiber rod or optical fiber (5), wherein, pumping is performed on the rare earth ion-doped optical fiber rod by the pumping source (2), one end of the optical fiber (5) is connected with an output endof the single-mode seed fiber laser (1); the optical fiber (5) with a cladding of the other end thereof partly or entirely removed is placed into a cladding (4) of the rare earth ion-doped optical fiber rod or a hole inside a core (6) of the rare earth ion-doped optical fiber rod, and then heat treatment is performed on the rare earth ion-doped optical fiber rod to ensure that the hole is free from air gap. The optical fiber (5) and the core (6) of the rare earth ion-doped optical fiber rod are strongly coupled, which causes the rare earth ion-doped optical fiber rod to resonate on the laser wavelength produced by the single-mode seed optical fiber laser, thus realizing the ultra-bright high power output of the single-mode laser.
Description
Technical field
The present invention relates to a kind of high-capacity optical fiber laser, particularly a kind of seed laser injection type single mode laser of active optical fiber rod.
Background technology
Fiber laser has been obtained increasingly extensive application with its remarkable performance and cheap price in fields such as optical fiber communication, industrial processes, medical treatment, military affairs.Although realized that in the laboratory single optical fiber output surpasses the single-mode laser of 1kW, and realized that this laser needs strict condition, be difficult to engineering and use; But along with the laser technology application and development, and the development of materials processing, space communication, laser radar, electrooptical countermeasures, laser weapon etc., the laser that needs high power, high-quality, high strength and superbright degree requires the single mode power output to reach MW even GW magnitude.Only adopt the rare-earth ion-doped fiber laser of double clad of the rare-earth ion-doped fibre core of single mode, because the rare-earth ion-doped fibre core core diameter of single mode is less than 10 μ m, be subjected to the restriction of non-linear, structural factor and diffraction limit, the optical power density of bearing is limited, the about 1W/ μ of the rare-earth ion-doped fiber laser fibre core of single mode continuous wave damaging thresholding m
2[J.Nilsson, J.K.Sahu, Y.Jeong, W.A.Clarkson, R.Selvas, A.B.Grudinin, and S.U.Alam, " High Power Fiber Lasers:NewDevelopments ", Proceedings of SPIE Vol.4974,50-59 (2003)], its optical damage danger becomes a major challenge that realizes high-power single mode fiber laser.Except optical damage,, even can finally melt fibre core because the heat that high-power light produces also can be damaged optical fiber.Bibliographical information is arranged, the erbium-ytterbium co-doped fiber laser can produce 100W heat [J.Nilsson for every meter, S.U.Alam, J.A.Alvarez-Chavez, P.W.Turner, W.A.Clarkson, and A.B.Grudinin; " High-power and tunable operation oferbi μ m-ytterbi μ m co-doped cladding-p μ mped fiber laser ", IEEE J.Quant μ m Electron.39,987-994 (2003)].
On the other hand, in general doubly clad optical fiber, because single mode is positioned at the center of multimode inner cladding, fiber core with single-mold is difficult to write grating constituting optical resonator, it is low that pump light is coupled in the doubly clad optical fiber efficient.
Summary of the invention
Limited and for the output single-mode laser power that overcomes existing traditional double covering single mode fiber laser along with the increase of luminous power, its output beam quality variation, heat resistanceheat resistant is poor, and traditional double covering single mode fiber laser fiber core with single-mold to write the grating difficulty big, pump light is coupled to inefficient shortcoming in the doubly clad optical fiber, the invention provides a kind of seed laser injection type single mode laser of active optical fiber rod, to realize high-power superbright degree single-mode laser output.It is simple that this fiber laser has a making apparatus, technology is simple and easy, make simple and cost low, and pump light is coupled to the high advantage of efficient of rare-earth ion-doped optical fibre rod.
The objective of the invention is to be achieved through the following technical solutions:
A kind of seed laser injection type single mode laser of active optical fiber rod, it comprises pumping source, single mode seed light fibre laser, rare-earth ion-doped optical fibre rod, optical fiber; Wherein pumping source carries out pumping to rare-earth ion-doped optical fibre rod;
One end of optical fiber is connected with the output of single mode seed light fibre laser, the other end removes the optical fiber of part or all of covering and inserts in the hole of rare-earth ion-doped optical fibre rod covering or rare-earth ion-doped optical fibre rod in-core, rare-earth ion-doped optical fibre rod heat-treated, make the hole not have the air gap thereafter.
The axis in the hole of described rare-earth ion-doped optical fibre rod covering or rare-earth ion-doped optical fibre rod in-core is parallel with rare-earth ion-doped optical fibre rod wire mandrel; The diameter in hole is a principle to hold the optical fiber that removes part or all of covering fully; The hole is in rare-earth ion-doped optical fibre rod covering the time, and the distance at the rare-earth ion-doped optical fibre rod core of the centre-to-centre spacing in hole center is less than 1/2 rare-earth ion-doped optical fibre rod core diameter+1/2 bore dia+5 μ m.
Single mode seed light fibre laser is single mode seed light fibre laser arbitrarily.
Optical fiber or be monomode fiber or for multimode fiber; Enter the fiber lengths of rare-earth ion-doped optical fibre rod or longer or shorter than rare-earth ion-doped optical fibre rod than rare-earth ion-doped optical fibre rod.
Single mode seed light fibre laser generation wavelength is in the emission spectra scope of rare-earth ion-doped optical fibre rod.
Beneficial effect of the present invention is specific as follows:
The described optical fibre rod laser that contains single mode seed light fibre laser and rare-earth ion-doped optical fibre rod does not need outside phase modulation apparatus, because single mode seed light fibre laser generation wavelength is in the emission spectra scope of rare-earth ion-doped optical fibre rod, by inner close coupling, make rare-earth ion-doped optical fibre rod core resonance at resonance on the optical maser wavelength of single mode seed light fibre laser, realize that active is phase-locked, thereby realize that single-mode laser superbright degree amplifies output.The described optical fibre rod laser that contains single mode seed light fibre laser and rare-earth ion-doped optical fibre rod, because rare-earth ion-doped optical fibre rod core area of dissipation is big, export higher power, again because rare-earth ion-doped optical fibre rod core is actually a kind of image intensifer, export high ten thousand times power than using single mode seed light fibre laser separately, simultaneously, because rare-earth ion-doped optical fibre rod core resonance is on the optical maser wavelength of single mode seed light fibre laser, make this laser can not reduce the quality of output laser, realized the high-power output of single-mode laser superbright degree simultaneously.
Description of drawings
Fig. 1 is the seed laser injection type single mode laser of active optical fiber rod front view of rare-earth ion-doped optical fibre rod covering punching.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the seed laser injection type single mode laser of active optical fiber rod front view of rare-earth ion-doped optical fibre rod covering punching.
Fig. 4 is the B-B profile of Fig. 3.
Fig. 5 is the seed laser injection type single mode laser of active optical fiber rod front view of rare-earth ion-doped optical fibre rod covering and the punching of core boundary.
Fig. 6 is the C-C profile of Fig. 5.
Fig. 7 is the seed laser injection type single mode laser of active optical fiber rod front view of rare-earth ion-doped optical fibre rod core punching.
Fig. 8 is the D-D profile of Fig. 7.
Fig. 9 is the seed laser injection type single mode laser of active optical fiber rod front view of rare-earth ion-doped optical fibre rod core punching.
Figure 10 is the E-E profile of Fig. 9.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
Present embodiment is referring to Fig. 1 and Fig. 2, and the rare-earth ion-doped optical fibre rod dopant ion of employing is an erbium ion, is described in detail as follows:
Rare-earth ion-doped optical fibre rod length is 10m.Monomode fiber 5 length are 50m.
The generation wavelength of single mode seed light fibre laser 1 is in the emission of ions spectral limit of Er-doped fiber rod.And seed light fibre laser and monomode fiber 5 link together.
Punching in rare-earth ion-doped optical fibre rod covering 4, the axis in hole and rare-earth ion-doped optical fibre rod core 6 parallel axes, the diameter in hole is 50 μ m.The center in hole to rare-earth ion-doped optical fibre rod core 6 centre-to-centre spacing are 529.5 μ m.
The monomode fiber 5 that erodes the part covering with hydrofluoric acid passes the hole of rare-earth ion-doped optical fibre rod; Rare-earth ion-doped optical fibre rod is heat-treated, make no air gap in the hole.
To rare-earth ion-doped optical fibre rod two ends smooth treatment, carry out end pumping with 2 pairs of rare-earth ion-doped optical fibre rod one ends of pumping source, the laser of seed laser injection type single mode laser of active optical fiber rod is exported from the rare-earth ion-doped optical fibre rod other end.
Embodiment two
Present embodiment is referring to Fig. 3 and Fig. 4, and the rare-earth ion-doped optical fibre rod dopant ion of employing is a ytterbium ion, is described in detail as follows:
Rare-earth ion-doped optical fibre rod length is 5m.Multimode fiber 5 length are 5m.
The generation wavelength of single mode seed light fibre laser 1 is in the emission of ions spectral limit of Yb dosed optical fiber rod.And seed light fibre laser and multimode fiber 5 link together.
Punching in rare-earth ion-doped optical fibre rod covering 4, the axis in hole and rare-earth ion-doped optical fibre rod sandwich layer parallel axes, the diameter in hole is 120 μ m; The center in hole to rare-earth ion-doped optical fibre rod core 6 centre-to-centre spacing are 2564 μ m.
The monomode fiber 5 that erodes covering with hydrofluoric acid penetrates the hole of rare-earth ion-doped optical fibre rod, and the multimode fiber length that enters rare-earth ion-doped optical fibre rod is 4m; Rare-earth ion-doped optical fibre rod is heat-treated, make no air gap in the hole.
End smooth treatment to rare-earth ion-doped optical fibre rod, the other end plates the highly reflecting films 7 of corresponding optical maser wavelength, and carrying out pumping with 2 pairs of rare-earth ion-doped optical fibre rods of pumping source, the laser of seed laser injection type single mode laser of active optical fiber rod is from the smooth end output of rare-earth ion-doped optical fibre rod.
Embodiment three
Present embodiment is referring to Fig. 5 and Fig. 6, and the rare-earth ion-doped optical fibre rod dopant ion of employing is a holmium ion, is described in detail as follows:
Rare-earth ion-doped optical fibre rod length is 1m.Monomode fiber 5 length are 2m.
The generation wavelength of single mode seed light fibre laser 1 is in mixing the emission of ions spectral limit of holmium optical fibre rod.And seed light fibre laser and monomode fiber 5 link together.
In rare-earth ion-doped optical fibre rod covering and the punching of sandwich layer boundary, the axis in hole and rare-earth ion-doped optical fibre rod sandwich layer parallel axes, the diameter in hole is 30 μ m; The center in hole to rare-earth ion-doped optical fibre rod core 6 centre-to-centre spacing are 5018 μ m.
The monomode fiber 5 that erodes covering with hydrofluoric acid penetrates the hole of rare-earth ion-doped optical fibre rod, and the multimode fiber length that enters rare-earth ion-doped optical fibre rod is 90cm; Rare-earth ion-doped optical fibre rod is heat-treated, make no air gap in the hole.
To rare-earth ion-doped optical fibre rod two ends smooth treatment, carry out end pumping with 2 pairs of rare-earth ion-doped optical fibre rod one ends of pumping source, the laser of seed laser injection type single mode laser of active optical fiber rod is exported from the rare-earth ion-doped optical fibre rod other end.
Embodiment four
Present embodiment is referring to Fig. 7 and Fig. 8, and the erbium ytterbium ion of the rare-earth ion-doped optical fibre rod dopant ion of employing for mixing altogether is described in detail as follows:
Rare-earth ion-doped optical fibre rod length is 50cm.Multimode fiber 5 length are 1m.
The generation wavelength of single mode seed light fibre laser 1 is in the emission of ions spectral limit of erbium-ytterbium co-doped fiber rod.And seed light fibre laser and multimode fiber 5 link together.
In rare-earth ion-doped optical fibre rod covering and the punching of sandwich layer boundary, the axis in hole is parallel with rare-earth ion-doped optical fibre rod wire mandrel, and the diameter in hole is 100 μ m, and the center in hole to rare-earth ion-doped optical fibre rod core 6 centre-to-centre spacing are 10052 μ m.
The monomode fiber 5 that erodes covering with hydrofluoric acid penetrates the hole of rare-earth ion-doped optical fibre rod, and the multimode fiber length that enters rare-earth ion-doped optical fibre rod is 40cm; Rare-earth ion-doped optical fibre rod is heat-treated, make no air gap in the hole.
One end of rare-earth ion-doped optical fibre rod is plated the highly reflecting films 7 of corresponding optical maser wavelength, and carry out end pumping with 2 pairs of rare-earth ion-doped optical fibre rods of pumping source, the other end smooth treatment of rare-earth ion-doped optical fibre rod, carry out profile pump with 21 pairs of rare-earth ion-doped optical fibre rods of pumping source, the laser of seed laser injection type single mode laser of active optical fiber rod is exported from rare-earth ion-doped optical fibre rod smooth treatment end.
Embodiment five
Referring to Fig. 9 and Figure 10, the neodymium ytterbium ion of the rare-earth ion-doped optical fibre rod dopant ion of employing for mixing altogether is described in detail as follows in the present embodiment:
Rare-earth ion-doped optical fibre rod length is 20cm.Multimode fiber 5 length are 2m.
The generation wavelength of single mode seed light fibre laser 1 is in the emission of ions spectral limit of neodymium ytterbium co-doped fiber rod.And seed light fibre laser and multimode fiber 5 link together.
In rare-earth ion-doped optical fibre rod covering and the punching of core boundary, the axis in hole is parallel with rare-earth ion-doped optical fibre rod wire mandrel, and the diameter in hole is 200 μ m; The monomode fiber 5 that grinds off the part covering with polishing passes the hole of rare-earth ion-doped optical fibre rod; Rare-earth ion-doped optical fibre rod is heat-treated, make no air gap in the hole.
To rare-earth ion-doped optical fibre rod two ends smooth treatment, carry out profile pump with 2 pairs of rare-earth ion-doped optical fibre rods of pumping source, the laser of seed laser injection type single mode laser of active optical fiber rod is exported from rare-earth ion-doped optical fibre rod end face.
Embodiment six
In the present embodiment, the rare-earth ion-doped optical fibre rod dopant ion of employing is described in detail as follows for rare-earth ion-doped arbitrarily:
Rare-earth ion-doped optical fibre rod length is 20cm～10m.
The generation wavelength of single mode seed light fibre laser 1 is in the emission spectra scope of rare-earth ion-doped optical fibre rod.And seed light fibre laser and optical fiber 5 link together.
In rare-earth ion-doped optical fibre rod covering or in-core punching, the axis in hole and rare-earth ion-doped optical fibre rod sandwich layer parallel axes, the distance at the center in hole and rare-earth ion-doped optical fibre rod core (6) center is less than 1/2 rare-earth ion-doped optical fibre rod core diameter+1/2 bore dia+5 μ m.
Pass or enter hole in the rare-earth ion-doped optical fibre rod with the optical fiber 5 that removes all or part of covering, rare-earth ion-doped optical fibre rod is heat-treated, make the hole not have the air gap.Wherein, the diameter in hole is with than the optical fiber that removes all or part of covering 5 core diameters of inserting principle greatly.
Carry out profile pump or end pumping or side and end face pumping simultaneously with 2 pairs of rare-earth ion-doped optical fibre rods of pumping source; One end of rare-earth ion-doped optical fibre rod is plated the highly reflecting films 7 of corresponding optical maser wavelength, in the equal smooth treatment of other end smooth treatment or two ends of rare-earth ion-doped optical fibre rod, the laser of seed laser injection type single mode laser of active optical fiber rod is exported from rare-earth ion-doped optical fibre rod end face.
Claims (3)
1. seed laser injection type single mode laser of active optical fiber rod, it is characterized by: it comprises pumping source (2), single mode seed light fibre laser (1), rare-earth ion-doped optical fibre rod, optical fiber (5); Wherein pumping source (2) carries out pumping to rare-earth ion-doped optical fibre rod;
One end of optical fiber (5) is connected with the output of single mode seed light fibre laser (1), the optical fiber (5) that the other end removes part or all of covering is inserted in the hole in rare-earth ion-doped optical fibre rod covering (4) or the rare-earth ion-doped optical fibre rod core (6), rare-earth ion-doped optical fibre rod heat-treated, make the hole not have the air gap thereafter.
2. seed laser injection type single mode laser of active optical fiber rod according to claim 1 is characterized by: the axis in the hole in described rare-earth ion-doped optical fibre rod covering (4) or the rare-earth ion-doped optical fibre rod core (6) is parallel with rare-earth ion-doped optical fibre rod wire mandrel; The diameter in hole is a principle to hold the optical fiber (5) that removes part or all of covering fully; The hole is in rare-earth ion-doped optical fibre rod covering (4) time, and the distance at the rare-earth ion-doped optical fibre rod core of the centre-to-centre spacing in hole (6) center is less than 1/2 rare-earth ion-doped optical fibre rod core diameter+1/2 bore dia+5 μ m.
3. seed laser injection type single mode laser of active optical fiber rod according to claim 1 is characterized by: single mode seed light fibre laser generation wavelength is in the emission spectra scope of rare-earth ion-doped optical fibre rod.
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Non-Patent Citations (2)
| Title |
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| 改进的高功率19芯光纤激光器的理论分析. 王春灿，张帆，童治，宁提纲，简水生.中国激光，第35卷第1期. 2008 |
| 改进的高功率19芯光纤激光器的理论分析. 王春灿，张帆，童治，宁提纲，简水生.中国激光，第35卷第1期. 2008 * |
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