CN102769243A - Method of high power ytterbium doped fiber laser of neodymium-doped fiber laser pump - Google Patents
Method of high power ytterbium doped fiber laser of neodymium-doped fiber laser pump Download PDFInfo
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Abstract
The invention relates to a method of a high power ytterbium doped fiber laser of a neodymium-doped fiber laser pump. The method uses semiconductor laser pump neodymium-doped fibers with centre wavelength of about 808nm (+-10nm) to output fiber lasers with centre wavelength of 920-960nm, and optical fiber laser pumping ytterbium doped fiber produced by a neodymium-doped fiber laser is used for producing optical fiber lasers with centre wavelength of about 1070nm. The method greatly improves luminance of a pumping source, promotes maximum power output of the optical fiber laser in magnitude, has no requirements for doped fibers, simplifies system design and lowers system cost.
Description
Technical field
The invention belongs to the fiber laser technology field, relate to the high power ytterbium-doping optical fiber laser, refer in particular to a kind of method of utilizing neodymium-doped fiber laser pumping Yb dosed optical fiber to produce high power laser light.
Background technology
Fiber laser has advantages such as conversion efficiency height, good beam quality, heat management convenience, compact conformation, can obtain the laser output of high power and high light beam quality.Early stage optical-fiber laser is mainly used in communication and sensory field, does not show the ability of high power output.In recent years, along with big mould area double-cladding doped fiber manufacturing process with the development of high brightness laser diode pumping technology, the power output of simple optical fiber laser improves rapidly with surprising rapidity.Because semiconductor pumping sources technology maturation, quantum lose advantages such as little, the high power ytterbium-doping optical fiber laser becomes fiber laser field primary study content.1999, the single mode power output of ytterbium-doping optical fiber laser reached 110 watts, and thoroughly having changed fiber laser is the history of low-power device.Over nearly 10 years, the single mode power output of single ytterbium-doping optical fiber laser was almost whenever just doubled at a distance from 2 years, constantly brought pleasantly surprised to people.The unique advantage that fiber laser has makes it obtain using widely at industrial circles such as remote welding, three-dimensional cutting, laser markings.In the national defence field, the unique advantage of fiber laser also makes it become the important light source of tactics high energy laser system.
In the design studies process of fiber laser, be pumping source through the semiconductor laser of selecting emission wavelength and optical fiber absorption characteristic to be complementary, can realize than higher laser-conversion efficiency.For yb-doped double-clad fiber, generally select output center wavelength be the high-power semiconductor laser of 915nm or 975nm as pumping source, the multikilowatt high-capacity optical fiber laser is mostly based on this realization at present.Yet further further investigation is not difficult to find; Since University of Southampton's reported first in 2004 behind the result of 1.36 kilowatts of high power optical fibre laser outputs; Over nearly 7 years; The power output of the ytterbium-doping optical fiber laser of most of research units be not significantly improved (domestic situation also is like this); The peak power output that adopts at present the diode-end-pumped yb-doped double-clad fiber to obtain in the world is 2.1 kilowatts (1.75 kilowatts of domestic present maximum powers), has American I PG photon technology company to realize 3 kilowatts and more high power optical fibre laser output in the world only.Because semiconductor laser brightness is limited, other unit adopts the conventional fiber laser power of 973 to 976nm diode-end-pumpeds to be limited in a kilowatt level always; The key that IPG photon technology company can research and develop the peak power fiber laser has been to use the mode of optical-fiber laser pumping optical fiber laser (being referred to as the secondary pumping usually), and its pump light wavelength and emission wavelength are more approaching.Single mode myriawatt level fiber laser with the said firm is an example, and its pump light wavelength is 1018 nm, and emission wavelength is that 1070nm (annotates: the emission spectra broad of Yb dosed optical fiber; Generally from 1030 nm to 1120 nm; Shoot laser centre wavelength is relevant with the performance of frequency-selecting device, is example with 1070 nm only here), quantum loss is merely 5%; When being about the semiconductor laser pump-coupling 1/2, greatly reduced the thermal force density in the optical fiber.1018 nm pump lights are produced by the diode-end-pumped Yb dosed optical fiber, and its brightness is more than 1000 times of conventional semiconductor laser brightness.The secondary pumping has impelled the develop rapidly of IPG photon technology company fiber laser in the advantage of thermal effect and pump light brightness.
It is worthy of note that the secondary pump technology of IPG photon technology company adopts diode-end-pumped to produce the 1018nm fiber laser, produces the 1070nm fiber laser with the 1018nm pumping then.Yet near 1030nm, the absorption spectra peak value is usually near 915nm or 975nm usually for the emission spectra peak value of conventional Yb dosed optical fiber.The emission cross section of the emission cross section of 1018nm wavelength much smaller than about the 1030nm; And absorption cross-section is much smaller than near the absorption cross-section 915nm or the 975nm; Therefore the Yb dosed optical fiber that makes up laser there is higher requirement; Need carry out particular design and drawing to Yb dosed optical fiber, system cost has been proposed high requirement.
Summary of the invention
In order to solve current secondary pump technology this weak point of strict demand to Yb dosed optical fiber, the present invention proposes a kind of new-type secondary pump technology.Its solution is: adopt neodymium-doped fiber laser to come the pumping ytterbium-doping optical fiber laser.As shown in Figure 1, Yb dosed optical fiber has two stronger absworption peaks near 915 nm and 975 nm, therefore mostly adopts at present centre wavelength to come the pumping Yb dosed optical fiber at the semiconductor laser of 915 nm or 975 nm.Compare with 1018 nm, it is big many that near the absorption coefficient of Yb dosed optical fiber 920-960 nm wanted, if therefore adopt the laser of this wave band to come the pumping Yb dosed optical fiber, to the requirement of Yb dosed optical fiber than low many of the situation that adopts 1018 nm laser pumpings.As shown in Figure 2, neodymium-doped fiber has stronger emission cross section near 920-960 nm.
Technical scheme of the present invention is: adopt centre wavelength diode-end-pumped neodymium-doped fiber (as shown in Figure 4) of (positive and negative 10 nm) about 808 nm; The optical-fiber laser of output center wavelength between 920-960 nm, what utilized is that centre wavelength is that diode-end-pumped neodymium-doped fiber about 808 nm produces centre wavelength and is the neodymium-doped fiber laser between the 920-960 nm; It is that (Yb dosed optical fiber shoot laser centre wavelength is relevant with the performance of frequency-selecting device for optical-fiber laser about 1070 nm that the optical-fiber laser pumping Yb dosed optical fiber that uses above-mentioned neodymium-doped fiber laser to produce again produces centre wavelength; Be example only with 1070 nm here; About 1070nm; Refer generally to 1030 nm to 1120 nm), what utilized is that to produce centre wavelength be the fiber laser about 1070 nm for the optical-fiber laser pumping Yb dosed optical fiber that utilizes centre wavelength to produce for the neodymium-doped fiber laser between the 920-960 nm.
The present invention has not only improved the brightness of pumping source greatly, has promoted the maximum power output of fiber laser with becoming magnitude; And doped fiber is not had specific (special) requirements, simplified system design, reduced system cost.
Description of drawings
Fig. 1 is the absorption cross-section and the emission cross section curve of Yb dosed optical fiber;
Fig. 2 is the emission cross section curve of neodymium-doped fiber;
Fig. 3 is the absorption cross-section curve of neodymium-doped fiber;
Fig. 4 is that to utilize centre wavelength be the neodymium-doped fiber laser structure principle chart about 1070 nm for the neodymium-doped fiber laser pumping Yb dosed optical fiber between the 920-960 nm produces centre wavelength;
Fig. 5 is that to produce centre wavelength be the laser amplifier structure principle chart about 1070 nm for the optical-fiber laser pumping Yb dosed optical fiber that utilizes centre wavelength to produce for the neodymium-doped fiber laser between the 920-960 nm;
Fig. 6 is that to produce centre wavelength be the neodymium-doped fiber laser structure principle chart between the 920-960 nm for the diode-end-pumped neodymium-doped fiber of (positive and negative 10 nm) about 808 nm for utilizing centre wavelength;
Fig. 7 is that to utilize the diode-end-pumped Yb dosed optical fiber to produce centre wavelength be the laser structure schematic diagram about 1070 nm.
Embodiment
Below in conjunction with diagram the present invention is further specified.Shown in Figure 4 for centre wavelength be that to produce centre wavelength be neodymium-doped fiber laser 1 structure principle chart between the 920-960 nm for diode-end-pumped neodymium-doped fiber about 808 nm.Wherein 1 is that a centre wavelength is the neodymium-doped fiber laser between the 920-960 nm; The internal structure of neodymium-doped fiber laser does; Being provided with N platform (N is the integer greater than 1) centre wavelength is the semiconductor laser about 808 nm, is the N * 1 pump combiner I of 1 centre wavelength at 808 nm at the back at semiconductor laser, is fiber grating I 131 after the pump combiner I of N * 1; After the fiber grating I is neodymium-doped fiber 14, is fiber grating II 132 after the neodymium-doped fiber.Wherein, between N platform semiconductor laser and the pump combiner I, between pump combiner I and the fiber grating I, between fiber grating I and the neodymium-doped fiber, all adopt fusing mode to be connected between neodymium-doped fiber and the fiber grating II.The pump combiner I is that the laser that the semiconductor laser about 808 nm is exported closes into optical fiber with N platform centre wavelength.The fiber grating I is consistent with the centre wavelength of fiber grating II, can be any numerical value between the 920-960 nm.Wherein the fiber grating I is high anti-to laser, and reflectivity is greater than 95%; The fiber grating II is low anti-to laser, and reflectivity is between 5% to 50%.Through structure shown in Figure 1, can produce centre wavelength is the neodymium-doped fiber laser between the 920-960 nm.
Shown in Figure 5 is fiber laser 2 structure principle charts about 1070 nm for the optical-fiber laser pumping Yb dosed optical fiber that utilizes centre wavelength to produce for the neodymium-doped fiber laser between the 920-960 nm produces centre wavelength.The centre wavelength that N platform neodymium-doped fiber laser shown in Figure 4 produces is the neodymium-doped fiber laser about (this sentences 940 nm is example) between the 920-960 nm; Difference called after 11,12 ... 1N; Thereafter is the N * 1 pump combiner II 22 of centre wavelength at 940 nm, is that the optical-fiber laser of the neodymium-doped fiber laser output of 940 nm closes into optical fiber through the pump combiner II with N platform centre wavelength; After the pump combiner II is fiber grating III 231, is Yb dosed optical fiber 24 after the fiber grating III, and Yb dosed optical fiber 24 backs are fiber grating IV 232.Wherein, between N neodymium-doped fiber laser and the pump combiner II, between pump combiner II and the fiber grating III, between fiber grating III and the Yb dosed optical fiber, all adopt fusing mode to be connected between Yb dosed optical fiber and the fiber grating IV.The fiber grating III is consistent with the centre wavelength of fiber grating III, can be any numerical value (this sentence 1070 nms be example) of 1030 nm to 1120 nm.Wherein the fiber grating III is high anti-to laser, and reflectivity is greater than 95%; The fiber grating IV is low anti-to laser, and reflectivity is between 5% to 50%.Through structure shown in Figure 5, can produce the optical-fiber laser that centre wavelength is 1070 nm.
Shown in Figure 6 is laser amplifier 3 structure principle charts about 1070 nm for the optical-fiber laser pumping Yb dosed optical fiber that utilizes centre wavelength to produce for the neodymium-doped fiber laser between the 920-960 nm produces centre wavelength.The centre wavelength that produces at N platform neodymium-doped fiber laser shown in Figure 4 is the optical-fiber laser about 940 nm; Difference called after 321,322 ... 32N; With 1 centre wavelength shown in Figure 7 is to be (N+1) * 1 pump combiner III 33 after the laser of laser 31 output about 1070 nm; After the pump combiner III is Yb dosed optical fiber 24, is optical fiber cap 35 after the Yb dosed optical fiber.Wherein, between N platform neodymium-doped fiber laser 1 and the pump combiner III 33, between laser 31 and the pump combiner III 33, all adopt fusing mode to be connected between Yb dosed optical fiber and the optical fiber cap.With N platform centre wavelength shown in Figure 4 is that neodymium-doped fiber laser 1 and 1 centre wavelength shown in Figure 7 about 940 nm is that the laser of laser 31 outputs about 1070 nm closes into optical fiber through the pump combiner III.Centre wavelength is that the laser of 1070 nm is exported via optical fiber cap 35, and can prevent that laser from returning along former road.Through structure shown in Figure 6, can be that the centre wavelength of laser 31 outputs about 1070 nm is that optical-fiber laser about 1070 nm carries out power amplification with utilizing the diode-end-pumped Yb dosed optical fiber to produce centre wavelength.
Fig. 7 is that to utilize the diode-end-pumped Yb dosed optical fiber to produce centre wavelength be laser 31 structure principle charts about 1070 nm.Adopt N platform semiconductor laser altogether, difference called after 311,312 ... 31N.311,312 ... The centre wavelength of 31N is consistent; Being about 915 nm about-975 nm, is the centre wavelength N consistent with N platform semiconductor laser * 1 pump combiner IV 36 thereafter, is fiber grating V 371 after the pump combiner IV; After the fiber grating V 371 is Yb dosed optical fiber 24; After the Yb dosed optical fiber 24 is fiber grating VI 372, wherein between N platform semiconductor laser and the pump combiner IV 36, between pump combiner IV 36 and the fiber grating V; Between fiber grating V and the Yb dosed optical fiber, all adopt fusing mode to be connected between Yb dosed optical fiber and the fiber grating VI.With 311,312 ... The output laser of 31N closes into optical fiber through the pump combiner IV.Fiber grating V 371 is consistent with the centre wavelength of fiber grating VI 372, can be any numerical value of 1030 nm to 1120 nm.Wherein 371 pairs of laser of fiber grating V are high anti-, and reflectivity is greater than 95%; 372 pairs of laser of fiber grating VI are low anti-, and reflectivity is between 5% to 50%.Through structure shown in Figure 7, can produce centre wavelength is the optical-fiber laser about 1070 nm.
Claims (7)
1. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping; It is characterized in that; Adopt the diode-end-pumped neodymium-doped fiber of centre wavelength about 808 nm; The optical-fiber laser of output center wavelength between 920-960 nm, what utilized is that centre wavelength is the neodymium-doped fiber laser about 1070 nm for the neodymium-doped fiber laser pumping Yb dosed optical fiber between the 920-960 nm produces centre wavelength; It is the optical-fiber laser about 1070 nm that the optical-fiber laser pumping Yb dosed optical fiber that uses above-mentioned neodymium-doped fiber laser to produce again produces centre wavelength; It is the fiber laser about 1070 nm that the optical-fiber laser pumping Yb dosed optical fiber that to be centre wavelength produce for the neodymium-doped fiber laser between the 920-960 nm that is utilized produces centre wavelength, and what perhaps utilize in the institute is that centre wavelength is the laser amplifier about 1070 nm for the optical-fiber laser pumping Yb dosed optical fiber generation centre wavelength that the neodymium-doped fiber laser between the 920-960 nm produces.
2. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 1 is characterized in that, the centre wavelength 808nm in the semiconductor laser of centre wavelength about 808 nm, positive and negative 10nm.
3. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 1 is characterized in that, producing centre wavelength is the optical-fiber laser about 1070 nm, about 1070nm, refers to that 1030 nm are to 1120 nm.
4. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 1; It is characterized in that; Said centre wavelength is that to produce centre wavelength be that neodymium-doped fiber laser structure about 1070 nm is to the neodymium-doped fiber laser pumping Yb dosed optical fiber between the 920-960 nm: in N platform centre wavelength is that semiconductor laser about 808 nm is the N * 1 pump combiner I of 1 centre wavelength at 808 nm at the back; N * 1 pump combiner I connects the fiber grating I; The fiber grating I connects neodymium-doped fiber; Neodymium-doped fiber connects the fiber grating II, between N platform semiconductor laser and the pump combiner I, between pump combiner I and the fiber grating I, between fiber grating I and the neodymium-doped fiber, all adopt fusing mode to be connected between neodymium-doped fiber and the fiber grating II.
5. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 1; It is characterized in that; Said centre wavelength is that to produce centre wavelength be that optical fiber laser structure about 1070 nm is for optical-fiber laser pumping Yb dosed optical fiber that the neodymium-doped fiber laser between the 920-960 nm produces: the centre wavelength that N platform neodymium-doped fiber laser produces is that the neodymium-doped fiber laser about between the 920-960 nm is the N * 1 pump combiner II of centre wavelength at 940 nm thereafter; After the pump combiner II is the fiber grating III; After the fiber grating III is Yb dosed optical fiber, is the fiber grating IV behind the Yb dosed optical fiber, wherein; Between N neodymium-doped fiber laser and the pump combiner II; Between pump combiner II and the fiber grating III, between fiber grating III and the Yb dosed optical fiber, all adopt fusing mode to be connected between Yb dosed optical fiber and the fiber grating IV.
6. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 1; It is characterized in that; Said centre wavelength is that to produce centre wavelength be that laser amplifier structure about 1070 nm is for optical-fiber laser pumping Yb dosed optical fiber that the neodymium-doped fiber laser between the 920-960 nm produces: the centre wavelength that produces at N platform neodymium-doped fiber laser is the optical-fiber laser about 940 nm; With 1 centre wavelength is to be (N+1) * 1 pump combiner III 33 after the laser of laser (31) output about 1070 nm, be Yb dosed optical fiber after the pump combiner III, and Yb dosed optical fiber is the optical fiber cap afterwards; Wherein, Between N platform neodymium-doped fiber laser and the pump combiner III, between laser (31) and the pump combiner III, all adopt fusing mode to be connected between Yb dosed optical fiber and the optical fiber cap.
7. the method for the high power ytterbium-doping optical fiber laser of neodymium-doped fiber laser pumping according to claim 6; It is characterized in that; Said centre wavelength is that laser (31) structure about 1070 nm is: N platform centre wavelength is that 915 nm-975 nm semiconductor lasers are the centre wavelength N * 1 pump combiner IV (36) consistent with N platform semiconductor laser thereafter; After the pump combiner IV is the fiber grating V, is Yb dosed optical fiber after the fiber grating V, is the fiber grating VI after the Yb dosed optical fiber; Wherein between N platform semiconductor laser and the pump combiner IV; Between pump combiner IV and the fiber grating V, between fiber grating V and the Yb dosed optical fiber, all adopt fusing mode to be connected between Yb dosed optical fiber and the fiber grating VI.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944048A (en) * | 2014-04-23 | 2014-07-23 | 北京大学 | Femtosecond laser device based on single cladding neodymium optical fibers and ring cavity and manufacturing method |
| CN104022433A (en) * | 2013-03-01 | 2014-09-03 | 普林斯顿光电子学公司 | Vertical cavity surface emitting laser (VCSEL) pumped fiber optic gain systems |
| CN107453194A (en) * | 2017-09-18 | 2017-12-08 | 珠海光恒科技有限公司 | A kind of 1064 pumped great-power narrow linewidth C band erbium-doped fiber amplifiers |
| CN109149339A (en) * | 2018-08-30 | 2019-01-04 | 中国人民解放军国防科技大学 | 800nm waveband high-brightness optical fiber laser capable of being used for pumping thulium-doped optical fiber |
| CN110434479A (en) * | 2019-06-24 | 2019-11-12 | 东莞理工学院 | A kind of high power laser light cutting machine |
| CN110620323A (en) * | 2019-10-31 | 2019-12-27 | 华南理工大学 | Neodymium-doped 1120nm single-frequency fiber laser |
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Cited By (8)
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| CN104022433A (en) * | 2013-03-01 | 2014-09-03 | 普林斯顿光电子学公司 | Vertical cavity surface emitting laser (VCSEL) pumped fiber optic gain systems |
| CN104022433B (en) * | 2013-03-01 | 2017-09-19 | 普林斯顿光电子学公司 | The fiber gain system of vertical cavity surface emitting laser pumping |
| CN103944048A (en) * | 2014-04-23 | 2014-07-23 | 北京大学 | Femtosecond laser device based on single cladding neodymium optical fibers and ring cavity and manufacturing method |
| CN103944048B (en) * | 2014-04-23 | 2017-08-25 | 北京大学 | A kind of femto-second laser and preparation method based on single covering neodymium optical fiber and annular chamber |
| CN107453194A (en) * | 2017-09-18 | 2017-12-08 | 珠海光恒科技有限公司 | A kind of 1064 pumped great-power narrow linewidth C band erbium-doped fiber amplifiers |
| CN109149339A (en) * | 2018-08-30 | 2019-01-04 | 中国人民解放军国防科技大学 | 800nm waveband high-brightness optical fiber laser capable of being used for pumping thulium-doped optical fiber |
| CN110434479A (en) * | 2019-06-24 | 2019-11-12 | 东莞理工学院 | A kind of high power laser light cutting machine |
| CN110620323A (en) * | 2019-10-31 | 2019-12-27 | 华南理工大学 | Neodymium-doped 1120nm single-frequency fiber laser |
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Application publication date: 20121107 |