CN103794973A - Fiber laser, gain fiber, method for manufacturing gain fiber, and beam shaping system - Google Patents
Fiber laser, gain fiber, method for manufacturing gain fiber, and beam shaping system Download PDFInfo
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- CN103794973A CN103794973A CN201210423552.4A CN201210423552A CN103794973A CN 103794973 A CN103794973 A CN 103794973A CN 201210423552 A CN201210423552 A CN 201210423552A CN 103794973 A CN103794973 A CN 103794973A
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- 239000000835 fiber Substances 0.000 title claims abstract description 156
- 238000007493 shaping process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 79
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000010168 coupling process Methods 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 230000010355 oscillation Effects 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000013078 crystal Substances 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 239000000443 aerosol Substances 0.000 claims description 5
- 230000003667 anti-reflective effect Effects 0.000 abstract 2
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000010147 laser engraving Methods 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The present invention relates to the laser field, and discloses a fiber laser, a gain fiber, a method for manufacturing the gain fiber, and a beam shaping system used for coupling. The fiber laser comprises a pumping LD, a pumping coupling system and the gain fiber, a first film layer which is highly reflective to pumping light and oscillation light is plated at one end of the gain fiber, and a second film layer which is highly reflective to the pumping light and is anti-reflective to the oscillation light is plated at the other end. One end face of the gain fiber is equipped with a micropore which is anti-reflective to the pumping light, or a micro lens used for inputting the pumping light is arranged at one side surface of the gain fiber. The pumping light emitted by the pumping LD passes the pumping coupling system to enter the gain fiber via the micropore or the micro lens, and is reflected repeatedly, totally and internally in the gain fiber for multiple pumping. The fiber laser possesses the short gain fiber and the low-cost multi-mode LD pumping, enables the coupling efficiency of the pumping micropore and the pumping absorptivity of the gain fiber to be improved and the cost to be reduced, and realizes a high power fiber laser structure of low cost.
Description
Technical field
The present invention relates to laser and field fiber, relate in particular to a kind of fiber laser, gain fibre and preparation method thereof, be also useful on the beam shaping system of coupling.
Background technology
Fiber laser, as the one of laser, has important application in fields such as laser fiber communication, the long distance communication of laser space, industrial shipbuilding, automobile making, laser engraving laser marking laser cutting.Current fiber laser, generally need to longer gain fibre reaches the object of abundant absorptive pumping light, to realize high-capacity optical fiber laser, and also also higher to the requirement of high power pumping LD, cost is difficult to reduce.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of fiber laser and gain fibre thereof, is also useful on the beam shaping system that high-power low cost multimode LD pump light is coupled into this gain fibre, and the manufacture method of gain fibre.Can realize the high absorptive pumping of short fiber gain media, high-capacity optical fiber laser cheaply.
For achieving the above object, the technical scheme that the present invention proposes is: a kind of fiber laser, comprise pumping LD, pumping coupling system and gain fibre, one end of described gain fibre is coated with all high the first anti-retes of pump light and oscillation light, the other end be coated with to pump light high anti-, to the second anti-reflection rete of oscillation light; Wherein an end face is provided with the micropore anti-reflection to pump light, or is provided for the lenticule of input pumping light in gain fibre side; The pump light that described pumping LD sends passes through described micropore by pumping coupling system or lenticule enters gain fibre, and in gain fibre repeatedly total internal reflection carry out repeatedly pumping.
Further, described gain fibre comprises fibre core, is placed on the surrounding layer of optical fibre rod outside fibre core and optical fibre rod outside; Or described gain fibre comprises fibre core and be placed on the capillary outside fibre core, and fibre core and capillary pass through SiO
2aerosol mixes and is integrated.
Further, described micropore departs from the axle center of gain fibre.
Further, described micropore is circle, ellipse, triangle or polygon; The Area Ratio of described micropore and gain fibre end face is between 1/100 ~ 1/5.
Further, described pumping coupling system comprises the first lens, half-wave plate or 90 ° of optically-active elements, birefringece crystal and second lens that set gradually along pumping light path; It is oval-shaped directional light that the pump light that described pumping LD sends becomes hot spot after first lens collimation, and described half-wave plate is placed in the light path of half of oval hot spot major axis.
Another technical scheme of the present invention is the gain fibre with pumping micropore for above-mentioned fiber laser, and one end is coated with all high the first anti-retes of pump light and oscillation light, the other end be coated with to pump light high anti-, to the second anti-reflection rete of oscillation light; Wherein an end face is provided with the micropore anti-reflection to pump light, or is provided for the lenticule of input pumping light in gain fibre side; Pump light enters gain fibre by described micropore or lenticule, and in gain fibre repeatedly total internal reflection carry out repeatedly pumping.
Further, described gain fibre comprises fibre core, is placed on the surrounding layer of optical fibre rod outside fibre core and optical fibre rod outside; Or described gain fibre comprises fibre core and be placed on the capillary outside fibre core, and fibre core and capillary pass through SiO
2aerosol mixes and is integrated; Described micropore departs from the shaft core position of gain fibre.
Making provided by the invention has the method for pumping micropore gain fibre, comprises the steps: 1) solidify a tiny area at gain fibre end face by ultraviolet glue; 2) whole gain fibre end face is carried out to plated film; 3) remove the rete above ultraviolet glue; 4) remove ultraviolet glue.
Another technical scheme of the present invention, a kind of beam shaping system, for being coupled to pump light shaping the gain fibre with pumping micropore, comprising the first lens, half-wave plate or 90 ° of optically-active elements, birefringece crystal and second lens that set gradually along light path; It is oval-shaped directional light that the pump light that described pumping LD sends becomes hot spot after first lens collimation, and described half-wave plate is placed in the light path of half of oval hot spot major axis.
Further, the focal length of described first lens is greater than the focal length of the second lens.
Beneficial effect of the present invention is: by pumping micropore or the lenticule of disalignment are set on double clad gain fibre, make coupling pump light in shorter fiber gain medium repeatedly total internal reflection carry out repeatedly pumping, realize the high absorptive pumping of short gain fibre; And by beam shaping system by the pump light shaping of ellipse light spot and dwindle into roundlet hot spot, to improve the coupling efficiency of pumping micropore, be convenient to utilize the high-power LD of multimode cheaply to carry out pumping.This fiber laser has short gain fibre, multimode LD pumping cheaply, has improved the absorptivity of gain fibre to pumping, has reduced cost, has realized high-capacity optical fiber laser structure cheaply.
Accompanying drawing explanation
Fig. 1 is optical fiber laser structure schematic diagram of the present invention;
Fig. 2 is gain fibre embodiment mono-structural representation of the present invention;
Fig. 3 is the schematic diagram of gain fibre left side shown in Fig. 2;
Fig. 4 is gain fibre embodiment bis-structural representations of the present invention;
Fig. 5 is gain fibre manufacturing process schematic diagram of the present invention;
Fig. 6 is beam shaping system configuration intention of the present invention.
Reference numeral: 1, pumping LD; 2, pumping coupling system; 21, first lens; 22, birefringece crystal; 23, half-wave plate; 24, the second lens; 3, gain fibre; 31, the first rete; 32, the second rete; 33, micropore; 34, fibre core; 35, optical fibre rod; 36, surrounding layer; 37, capillary; 4, ultraviolet glue.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The present invention is by plating at double clad gain fibre end face the high anti-rete of pump light, on high-reflecting film layer, make the micropore of transmissive pump light simultaneously, or make lenticule in gain fibre side with input pumping light, make coupling pump light in shorter fiber gain medium repeatedly total internal reflection carry out repeatedly pumping, thereby realize the gain fibre of the high absorptive pumping of short fiber gain media; And by beam shaping system by the pump light shaping of ellipse light spot and dwindle into roundlet hot spot, to improve the coupling efficiency of pumping micropore, be convenient to utilize the high-power LD of multimode cheaply to carry out pumping.This fiber laser has short gain fibre, multimode LD pumping cheaply, has improved the absorptivity of gain fibre to pumping, has reduced cost, has realized high-capacity optical fiber laser structure cheaply.
Concrete fiber laser embodiment as shown in Figure 1, comprise pumping LD1, pumping coupling system 2 and gain fibre 3, this gain fibre 3 is a doubly clad optical fiber, its one end is coated with all high the first anti-retes 31 of pump light and oscillation light, the other end be coated with to pump light high anti-, to the second anti-reflection rete 32 of oscillation light; Wherein an end face is provided with the micropore 33 anti-reflection to pump light, this micropore 33 departs from the axle center of gain fibre 3, the pump light that pumping LD1 sends enters gain fibre 3 by pumping coupling system 2 through this micropore 33, and total internal reflection repeatedly in gain fibre 3, absorbed by fibre core 34, realize repeatedly pumping.Concrete gain fibre as shown in Figures 2 and 33 and end view thereof, the region A of these gain fibre 3 end faces is micropore 33, other regions B except the A of region is coated with pump light and all high the first anti-retes 31 of oscillation light, region A is coated with the rete anti-reflection to pump light, and position deviation optical fiber axle center.So, when pump light is through micropore 33(region A) enter after gain fibre 3, pump light will be in gain fibre 3 experiences total internal reflection repeatedly, finally absorbed by fibre core 34 completely.The diameter of supposing micropore 33 is φ 1, and area is S1, and the diameter of gain fibre 3 end faces is φ 2, and area is S2, and the number of times that pump light can total internal reflection in optical fiber is S2/S1=(φ 2/ φ 1)
2, as φ 2=200 μ m, φ 1=20 μ m, reflexible number of times is S2/S1=100 time, so pump light can be absorbed by fibre core repeatedly, thereby greatly improves its absorption efficiency to pump light, therefore adopt shorter optical fiber can realize Laser output.The lenticule that also can be provided in gain fibre 3 sides input pumping light, is coupled to pump light in gain fibre 3 and makes pump light total internal reflection repeatedly in optical fiber by side, to carry out repeatedly pumping, improves the absorption efficiency of gain fibre 3 to pump light.
Wherein, gain fibre 3 can adopt structure as shown in Figure 2, comprises fibre core 34, is placed on the surrounding layer 36 of optical fibre rod 35 outside fibre core 34 and optical fibre rod outside.Also structure that can be as shown in Figure 4, comprises fibre core 34 and is placed on the capillary 37 of fibre core outer 34.For example, can adopt SiO
2the fiber core 34 that aerosol is 125 μ m by diameter mixes and is made into the resonant cavity of a section short with the capillary 37 of diameter 1mm.At the front end face of gain fibre 3, except the A of region, other regions (region B) plating is to pump light and all high the first anti-retes 31 of oscillation light, and region A is coated with the rete anti-reflection to pump light, forms micropore 33; That the rear end face of gain fibre 3 is coated with is high anti-to pump light, to the second anti-reflection rete 32 of oscillation light.The structure that adopts capillary 37 and fibre core 34 combinations, can obtain larger S2/S1 ratio, as capillary 37 diameter phi 2=1000 μ m, micropore 33 diameter phi 1=30 μ m, can obtain in theory the reflection-absorption of thousands of times, and increase micropore 33 diameters, thus the coupling of more convenient LD pump light.
For obtaining the high-capacity optical fiber laser of lower cost, the high-power low cost multimode LD of general employing carries out pumping, but general multimode LD spot size is larger, and the angle of divergence in a direction is large, the angle of divergence of other direction is less, hot spot oval in shape, the present invention adopts the pumping coupling system 2 of a beam shaping system as this fiber laser, and the pump light of pumping LD1 is carried out being coupled in gain fibre 3 after shaping.As shown in Figure 6, this pumping coupling system 2(beam shaping system) comprise the first lens 21, half-wave plate 23, birefringece crystal 22 and the second lens 24 that set gradually along light path; It is oval-shaped directional light that the pump light that pumping LD1 sends becomes hot spot after first lens 21 collimations, and half-wave plate 23 is placed in the light path of half of oval hot spot major axis.Wherein, the focal length L1 of first lens 21 is greater than the focal length L2 of the second lens 24, the optical axis of birefringece crystal 22 and its plane of incidence angle at 45 °.Directional divergence angle of pump light that pumping LD1 sends is larger, the directional divergence angle perpendicular with it is less, hot spot oval in shape, first after half-wave plate 23, enter again birefringece crystal 22 in the last light splitting of the larger direction in beam emissions angle, now its polarization direction half-twist, and another part light directly enters birefringece crystal 22, now two-part light polarization direction is mutually vertical, after birefringece crystal 22, be combined into light beam output, hot spot is compressed in the larger direction of the script angle of divergence, the hot spot that makes output beam is sub-circular, focus on and obtain the reduced light beam of hot spot through the second lens 24 again.The multiple that hot spot dwindles is the focal length L1 of first lens 21 and the ratio L1/L2 of the focal length L2 of the second lens 24, generally, hot spot can be dwindled to 4-8 doubly, the i.e. pump spot to 100 μ m-200 μ m, can narrow down to 12 μ m-25 μ m, just can be easily be coupled into and in optical fiber, carry out pumping by the micropore 33 of gain fibre 3.Can inject gain fibre by micropore by after the multimode LD shaping of 1W-10W, realize higher pumping coupling efficiency, reduce costs.Wherein, half-wave plate 23 also can be substituted by one 90 ° of optically-active elements.
A kind of manufacture method of above-mentioned gain fibre 3 as shown in Figure 5, comprises the steps: 1) solidify a tiny area in the suitable position of gain fibre 3 end faces (stray fiber axle center) by ultraviolet glue 4; 2) whole gain fibre 3 end faces are carried out to plated film; 3) remove ultraviolet glue 4 rete above; 4) remove ultraviolet glue 4, can form the gain fibre 3 with pumping micropore 33.Wherein step 1 can complete under high-power microscope.
The micropore 33 of above-mentioned gain fibre 3 can be the geometries such as circle, ellipse, triangle or polygon; Preferably, the Area Ratio of micropore 33 and gain fibre 3 end faces is between 1/100 ~ 1/5.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; the various variations of in the form and details the present invention being made, are protection scope of the present invention.
Claims (10)
1. a fiber laser, comprise pumping LD, pumping coupling system and gain fibre, it is characterized in that: one end of described gain fibre is coated with all high the first anti-retes of pump light and oscillation light, the other end be coated with to pump light high anti-, to the second anti-reflection rete of oscillation light; Wherein an end face is provided with the micropore anti-reflection to pump light, or is provided for the lenticule of input pumping light in gain fibre side; The pump light that described pumping LD sends passes through described micropore by pumping coupling system or lenticule enters gain fibre, and in gain fibre repeatedly total internal reflection carry out repeatedly pumping.
2. a kind of fiber laser as claimed in claim 1, is characterized in that: described gain fibre comprises fibre core, be placed on optical fibre rod outside fibre core and the surrounding layer of optical fibre rod outside; Or described gain fibre comprises fibre core and be placed on the capillary outside fibre core, and fibre core and capillary pass through SiO
2aerosol mixes and is integrated.
3. a kind of fiber laser as claimed in claim 1 or 2, is characterized in that: described micropore departs from the axle center of gain fibre.
4. a kind of fiber laser as claimed in claim 3, is characterized in that: described micropore is circular, oval, triangle or polygon; The Area Ratio of described micropore and gain fibre end face is between 1/100 ~ 1/5.
5. a kind of fiber laser as claimed in claim 1, is characterized in that: described pumping coupling system comprises the first lens, half-wave plate or 90 ° of optically-active elements, birefringece crystal and second lens that set gradually along pumping light path; It is oval-shaped directional light that the pump light that described pumping LD sends becomes hot spot after first lens collimation, and described half-wave plate is placed in the light path of half of oval hot spot major axis.
6. a gain fibre with pumping micropore, is characterized in that: one end is coated with all high the first anti-retes of pump light and oscillation light, the other end be coated with to pump light high anti-, to the second anti-reflection rete of oscillation light; Wherein an end face is provided with the micropore anti-reflection to pump light, or is provided for the lenticule of input pumping light in gain fibre side; Pump light enters gain fibre by described micropore or lenticule, and in gain fibre repeatedly total internal reflection carry out repeatedly pumping.
7. a kind of gain fibre with pumping micropore as claimed in claim 6, is characterized in that: described gain fibre comprises fibre core, be placed on optical fibre rod outside fibre core and the surrounding layer of optical fibre rod outside; Or described gain fibre comprises fibre core and be placed on the capillary outside fibre core, and fibre core and capillary pass through SiO
2aerosol mixes and is integrated; Described micropore departs from the shaft core position of gain fibre.
8. making has a method for pumping micropore gain fibre, it is characterized in that: comprise the steps: 1) solidify a tiny area in gain fibre end face ultraviolet glue; 2) whole gain fibre end face is carried out to plated film; 3) remove the rete above ultraviolet glue; 4) remove ultraviolet glue.
9. a beam shaping system, for pump light shaping being coupled to the gain fibre with pumping micropore, is characterized in that: comprise the first lens, half-wave plate or 90 ° of optically-active elements, birefringece crystal and second lens that set gradually along light path; It is oval-shaped directional light that the pump light that described pumping LD sends becomes hot spot after first lens collimation, and described half-wave plate is placed in the light path of half of oval hot spot major axis.
10. a kind of beam shaping system as claimed in claim 9, is characterized in that: the focal length of described first lens is greater than the focal length of the second lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210423552.4A CN103794973A (en) | 2012-10-30 | 2012-10-30 | Fiber laser, gain fiber, method for manufacturing gain fiber, and beam shaping system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210423552.4A CN103794973A (en) | 2012-10-30 | 2012-10-30 | Fiber laser, gain fiber, method for manufacturing gain fiber, and beam shaping system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305215A (en) * | 2015-11-06 | 2016-02-03 | 华中科技大学 | a laser |
| CN111244737A (en) * | 2020-01-17 | 2020-06-05 | 武汉安扬激光技术有限责任公司 | Rod-shaped photonic crystal fiber amplifier |
| CN112993731A (en) * | 2019-12-13 | 2021-06-18 | 华为技术有限公司 | Gain adjuster, gain adjusting method and optical line terminal |
| CN113013717A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Double-cladding optical fiber laser pumping device |
| CN115313135A (en) * | 2022-09-29 | 2022-11-08 | 安徽华创鸿度光电科技有限公司 | Elliptical light spot laser |
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| WO2007072334A1 (en) * | 2005-12-19 | 2007-06-28 | Koninklijke Philips Electronics, N.V. | Rod integrator that reduces speckle in a laser-based projector |
| CN101539666A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Optical structure for reducing laser speckle effect and manufacturing method thereof |
| CN101540470A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Laser |
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2012
- 2012-10-30 CN CN201210423552.4A patent/CN103794973A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007072334A1 (en) * | 2005-12-19 | 2007-06-28 | Koninklijke Philips Electronics, N.V. | Rod integrator that reduces speckle in a laser-based projector |
| CN101539666A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Optical structure for reducing laser speckle effect and manufacturing method thereof |
| CN101540470A (en) * | 2009-01-22 | 2009-09-23 | 福州高意通讯有限公司 | Laser |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305215A (en) * | 2015-11-06 | 2016-02-03 | 华中科技大学 | a laser |
| CN105305215B (en) * | 2015-11-06 | 2018-08-17 | 华中科技大学 | A kind of laser |
| CN112993731A (en) * | 2019-12-13 | 2021-06-18 | 华为技术有限公司 | Gain adjuster, gain adjusting method and optical line terminal |
| CN111244737A (en) * | 2020-01-17 | 2020-06-05 | 武汉安扬激光技术有限责任公司 | Rod-shaped photonic crystal fiber amplifier |
| CN111244737B (en) * | 2020-01-17 | 2021-05-14 | 武汉安扬激光技术有限责任公司 | Rod-shaped photonic crystal fiber amplifier |
| CN113013717A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Double-cladding optical fiber laser pumping device |
| CN115313135A (en) * | 2022-09-29 | 2022-11-08 | 安徽华创鸿度光电科技有限公司 | Elliptical light spot laser |
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