CN1424793A - Cylindrical-arranged pluse double-clad optical fibre amplifiers - Google Patents
Cylindrical-arranged pluse double-clad optical fibre amplifiers Download PDFInfo
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- CN1424793A CN1424793A CN 03114820 CN03114820A CN1424793A CN 1424793 A CN1424793 A CN 1424793A CN 03114820 CN03114820 CN 03114820 CN 03114820 A CN03114820 A CN 03114820A CN 1424793 A CN1424793 A CN 1424793A
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Abstract
A pulse amplifier with dual-cladding multi-mode optical fibre arranged cylindrically use high-quality low-power pulse laser as seed light source. The external cladding on a tangent line is removed to form a pump window coupled with a strip of internal cladding. A semiconductor laser pump source and a focusing lens are opposite to it. The linearly polarized pulse laser from seed light source is converted to properly polarized pulse laser by 1/2 wave plate and 1/4 wave plate, which is coupled into one end of optical fibre. After amplified, a high-power laser is output from its another end. Its advantages are compact structure, efficient and uniform pumping, and high output power.
Description
Technical field:
The present invention relates to laser, it is a kind of pulse double-cladding fiber amplifier of cylindrical arrangement, be with doubly clad optical fiber by the cylindrical arrangement of certain diameter as amplifier, as seed light source, constitute a kind of pulse double-cladding fiber amplifier of exporting high-energy, high light beam quality by pulse laser.
Background technology:
In the pulse double-clad optical fiber laser of transferring Q, short focal length aspherical microlens that needs and extraordinary acousto-optic modulator and coupling thereof are technological difficulties, and this mode is difficult to realize the pulse laser output of high-average power, referring to technology [Opt.Lett. formerly, 25 (1), 2000, P37].In fiber laser and amplifier, pump light will enter inner cladding just can play the pumping effect.Formerly in the technology, pulse optical fiber or amplifier are to make pump light enter the two ends of optical fiber by focusing, realize that by using double color plate pump light and seed light enter doubly clad optical fiber.Because an optical fiber has only two end faces, each end face has certain destruction thresholding, and this has just limited total pump energy, referring to technology [Electron.Lett.35:1158-1160,1999] formerly.Another kind of structure is the shape that fiber reel is become mosquito repellent coil disc, by removing the side surrounding layer, fiber core is carried out pumping, referring to formerly technology [JP Patent No.9-174450] and [JP Patent No.9-289851], can increase the coupling of pump light, but because the structure centre part circumference of mosquito repellent coil disc will reach uniform pumping (pumping source is promptly arranged at a certain distance) more complicated technically much smaller than periphery.Enter when utilizing double color plate to realize pump light and seed light, referring to technology [CLEO2002,591-592] formerly, have high requirements to realizing the high anti-and saturating double color plate of pump light height of seed light, and must realize simultaneously that seed light enters fibre core and pump light enters inner cladding, technical difficulty is bigger.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome the deficiency of technology formerly, the pulse double-cladding fiber amplifier of cylindrical arrangement is provided, reaches compactness simple for structure, pumping is even, pumping efficiency is higher, can obtain the polarization laser output of high-energy, good beam quality.
Technical conceive of the present invention is:
The present invention becomes cylindrical as amplifier with the multimode doubly clad optical fiber dish of thick core, selects suitable cylindrical diameter (generally at 1.5cm～2.5cm), to make it to realize the single mode running.Tangent line is removed surrounding layer as coupling pumping window outside a cylindrical circle, forms the coupling pumping window of strip, just in time is fit to be complementary with the pumping source strip output of strip arrays of semiconductor structures, thereby realizes high pumping efficient.The pulse laser of seed source is the Polarization Controller by being made up of wave plate earlier, enters the fibre core of doubly clad optical fiber then through coupling optical system, is amplified by the fiber amplifier of cylindrical arrangement, realizes the pulse laser output of high-energy, high light beam quality.
Concrete technical solution of the present invention is as follows:
A kind of pulse double-cladding fiber amplifier of cylindrical arrangement, comprise the big core diameter doubly clad optical fiber of multimode, pumping source, condenser lens, seed source laser, 1/2 wave plate, quarter wave plate and coupling optical system, be characterized in that said doubly clad optical fiber is arranged into cylinder, its end face is the polishing of vertical fiber axis, and end face is for to become 8 °～15 ° polishings, optical fiber closely to be arranged into the suitable cylinder of diameter with shaft axis of optic fibre, tangent line outside a cylindrical circle (OO ') removes the surrounding layer of doubly clad optical fiber, form a rectangular inner cladding as coupling pumping window, the laser beam of pumping source output is aimed at the coupling pumping window on the cylinder, is equipped with condenser lens between coupling pumping window and pumping source, be coupled the pumping window on the focus of condenser lens, the center line (O of the pumping window that wherein is coupled
1O ') with the axis (O of longitudinal center of condenser lens
2O ") and the axis (O of longitudinal center of pumping source light-emitting area
3O ) be parallel to each other at grade, the output pulse laser of described seed source laser is along X
1X
2The direction outgoing is around axis X
1X
2By the adjusting control of 1/2 wave plate and quarter wave plate realization paired pulses laser polarization state, seed light is injected the fibre core of doubly clad optical fiber end face by coupling optical system.
The core material of said doubly clad optical fiber is a working-laser material, is quartz or the glass of doping with rare-earth ions (Yb or Nd), is the thicker multimode doubly clad optical fiber of fibre core.
The cross-sectional profile of said doubly clad optical fiber inner cladding is a rectangle, or square, or other polygon.
The pump optical wavelength of said pumping source should be complementary with the absorbing wavelength of doubly clad optical fiber core material, is the semiconductor laser of long light-emitting area, or semiconductor laser array.
Said condenser lens is that focal spot is the cylindrical mirror of wire, or the microtrabeculae lens array.
Said seed source pulse laser is the Nd:YAG laser of accent Q, or transfers the Nd:YVO of Q
4Laser, or pulse optical fiber.
Said 1/2 wave plate and quarter wave plate are the wave plate of quartz crystal materials, or the wave plate of mica material, or the wave plate that is made by the single mode ordinary optic fibre.
Said coupling optical system is the coupled system that is made of the spherical lens group, or the coupled system that is made of non-spherical lens.
Description of drawings: Fig. 1 is the structural representation of the pulse double-cladding fiber amplifier of cylindrical arrangement of the present invention
Embodiment:
See also Fig. 1 earlier, the structure of the pulse double-cladding fiber amplifier of cylindrical arrangement of the present invention.Comprise: doubly clad optical fiber 1, pumping source 4, condenser lens 3, seed source laser 8,1/2 wave plate 9, quarter wave plate 10 and coupling optical system 11.Doubly clad optical fiber 1 is arranged into, coiled cylinder 5 as coil in other words, tangent line O outside a circle of cylinder 5
1O ' removes the surrounding layer of doubly clad optical fiber 1, exposes a rectangular inner cladding, as coupling pumping window 2.Coupling pumping window 2 by on the pumping source 4 emitted laser bundles aligning cylinder 5 is equipped with condenser lens 3 between coupling pumping window 2 and pumping source 4.Coupling pumping window 2 is positioned on the focus of condenser lens 3.The center line O of pumping window 2 wherein is coupled
1The axis O of longitudinal center of O ' and condenser lens 3
2O " and the axis O of longitudinal center of pumping source 4 strip light-emitting areas
3O is parallel to each other at grade.The output pulse laser of seed source laser 8 is along X
1X
2The direction outgoing is around axis X
1X
2Rotate 1/2 wave plate 9 and quarter wave plate 10 and realize the adjusting of paired pulses laser polarization state, seed light is injected the fibre core of doubly clad optical fiber 1 by coupling optical system 11.
An end face 7 of said doubly clad optical fiber 1 is perpendicular to shaft axis of optic fibre and polished, and other end 6 becomes 8 °～15 ° angles and polished with shaft axis of optic fibre, to avoid producing laser generation.
The core material of said doubly clad optical fiber 1 is a working-laser material, is the quartz or the glass of rare-earth ion-doped (Yb or Nd).
The fibre core of said doubly clad optical fiber 1 is the multimode fibre core, and diameter can be 25～60 μ m, and the fibre core area increases makes the nonlinear effect threshold value raise, and energy storage increases, and damage threshold raises, and can obtain the single pulse energy greater than 1mJ.And made things convenient for entering of seed light.
The profile of the cross section of said doubly clad optical fiber 1 inner cladding is a rectangle, or square, or other polygon.
The diameter of said cylinder 5 is 1.5cm～2.5cm, makes the low-order mode loss minimum of doped core, and the loss of high-rder mode is bigger, adopt this technology, the core diameter of optical fiber 1 can not be subjected to the restriction of single mode condition, and fibre-optical bending has strengthened the absorption of fibre core to pumping, has improved efficient.Because the inclined to one side effect of protecting is played in the stress birfringence that fibre-optical bending is introduced to a certain extent, only need just can realize stable linear polarization output by the polarization state of seed light source 8 is regulated by rotating wave plate 8 and 10.
The pump optical wavelength of said pumping source 4 should be complementary with the absorbing wavelength of doubly clad optical fiber 1 SMIS fiber material, for example for doping Yb
3+The material of ion, its absworption peak be at 915nm, 940nm and 975nm, and then the wavelength of pumping source 4 can be selected 915nm, 940nm or select 975nm.For mixing Nd
3+Rare earth ion, pumping wavelength will be selected 808nm.Because the coupling pumping window 2 on the cylinder 5 is one rectangular, so the light-emitting area of pumping source 4 also should be corresponding with it, is a rectangular light-emitting area.If cylinder 5 is longer, then pumping source 4 is semiconductor lasers of long light-emitting area, or semiconductor laser array.
Said condenser lens 3 is that focal spot is the cylindrical mirror of wire, or is microlens array.
Said seed source pulse laser 8 can be the Nd:YAG laser of transferring Q, or mixes Nd glass pulse laser, or pulse optical fiber.
Said 1/2 wave plate 9 and quarter wave plate 10 can be the wave plate of quartz crystal materials, or the wave plate of mica material, or the wave plate that is made by the single mode ordinary optic fibre.
The coupled system that said coupling optical system 11 can be made of the spherical lens group, the also coupled system that can constitute by non-spherical lens.
Pumping source 4 with long light-emitting area is launched the pump beam that the absorbing wavelength of wavelength and doubly clad optical fiber 1 core material is complementary, being focused into a wire hot spot through condenser lens 3 gathers just on the coupling pumping window 2 of cylinder 5 strips, by inner cladding pumping fibre core, make the working-laser material of fibre core produce population inversion.The polarization state of regulating the pulse laser of control seed sources 8 by 1/2 wave plate 9 and quarter wave plate 10 is injected the fibre core of doubly clad optical fiber 1 by coupling optical system 11 with seed light, realizes the amplification of seed light, by end face 6 output high energy pulse laser.
The physical parameter of enumerating a specific embodiment is as follows:
As shown in Figure 1, the core material of described doubly clad optical fiber 1 is doping Yb
3+The quartz glass of ion, the absworption peak of wavelength be at 915nm, 940nm and 975nm.Pumping source 4 is semiconductor laser diode arrays, and 4 have two, and corresponding with it condenser lens 3 also has two block length cylindrical lenses.The long 25m of doubly clad optical fiber, core diameter 30 μ m, numerical aperture 0.1, the cross section of inner cladding is 400 * 340 μ m, the surrounding layer cross section is 430 * 370 μ m, fiber end face 6 becomes 12 ° of polishings with shaft axis of optic fibre, end face 7 is vertical with shaft axis of optic fibre to be polished, and closely is arranged on the cylinder that diameter is 1.86cm.Seed source 8 is the Nd:YAG micro-slice laser of accent Q, wavelength 1064nm, and pulse duration 80～300ps, repetition rate 10～50kHz, average power can reach 2W.1/2 wave plate 9 and quarter wave plate 10 are high-precision quartz crystal wave plate, and coupling optical system 11 is the aspheric surface coupled system.The pulse double-cladding fiber amplifier of present embodiment is output as the laser beam of single polarization high light beam quality, and single pulse energy is greater than 1mJ, and average power can reach nearly hectowatt.
In sum, the pulse double-cladding fiber amplifier of cylindrical arrangement of the present invention is compared tool with technology formerly Compact conformation is arranged, and pumping is even, and the characteristics that pumping efficiency is higher can obtain the inclined to one side of high-energy, good beam quality Laser output shakes.
Claims (8)
1. the pulse double-cladding fiber amplifier of a cylindrical arrangement, comprise the big core diameter doubly clad optical fiber of multimode (1), pumping source (4), condenser lens (3), seed source laser (8), 1/2 wave plate (9), quarter wave plate (10) and coupling optical system (11), it is characterized in that said doubly clad optical fiber (1) is arranged into cylinder (6), its end face (7) is the polishing of vertical fiber axis, end face (6) is for becoming 8 °～15 ° polishings with shaft axis of optic fibre, optical fiber closely is arranged into the suitable cylinder of diameter (5), tangent line outside a circle of cylinder (5) (OO ') removes the surrounding layer of doubly clad optical fiber (1), form a rectangular inner cladding as coupling pumping window (2), the laser beam of pumping source (4) output is aimed at the coupling pumping window (2) on the cylinder (5), is equipped with condenser lens (3) between coupling pumping window (2) and pumping source (4), be coupled pumping window (2) on the focus of condenser lens (3), the center line (O of the pumping window (2) that wherein is coupled
1O ') with the axis (O of longitudinal center of condenser lens (3)
2O ") and the axis (O of longitudinal center of pumping source (4) light-emitting area
3O ) be parallel to each other at grade, the output pulse laser of described seed source laser (8) is along X
1X
2The direction outgoing is around axis X
1X
2By the adjusting control of 1/2 wave plate (9) and quarter wave plate (10) realization paired pulses laser polarization state, seed light is injected the fibre core of doubly clad optical fiber end face (7) by coupling optical system (11).
2. the pulse double-cladding fiber amplifier of cylindrical arrangement according to claim 1, the core material that it is characterized in that said doubly clad optical fiber (1) is a working-laser material, being quartz or the glass of doping with rare-earth ions (Yb or Nd), is the thicker multimode doubly clad optical fiber of fibre core.
3. the pulse double-cladding fiber amplifier of cylindrical arrangement according to claim 1 is characterized in that the cross-sectional profile of said doubly clad optical fiber (1) inner cladding is a rectangle, or square, or other polygon.
4. the pulse double-cladding fiber amplifier of cylindrical arrangement according to claim 1, the pump optical wavelength that it is characterized in that said pumping source (4) should be complementary with the absorbing wavelength of doubly clad optical fiber (1) core material, be the semiconductor laser of long light-emitting area, or semiconductor laser array.
5. the pulse double-cladding fiber amplifier of cylindrical arrangement according to claim 1 is characterized in that said condenser lens (3) is the cylindrical mirror of wire for focal spot, or the microtrabeculae lens array.
6. require the pulse double-cladding fiber amplifier of 1 described cylindrical arrangement according to letter of authorization, it is characterized in that the Nd:YAG laser of said seed source pulse laser (8), or transfer the Nd:YVO of Q for accent Q
4Laser, or pulse optical fiber.
7. require the pulse double-cladding fiber amplifier of 1 described cylindrical arrangement according to letter of authorization, it is characterized in that said 1/2 wave plate (9) and quarter wave plate (10) are the wave plate of quartz crystal materials, or the wave plate of mica material, or the wave plate that makes by the single mode ordinary optic fibre.
8. require the pulse double-cladding fiber amplifier of 1 described cylindrical arrangement according to letter of authorization, it is characterized in that said coupling optical system (11) is the coupled system that is made of the spherical lens group, or the coupled system that constitutes by non-spherical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114820 CN1424793A (en) | 2003-01-10 | 2003-01-10 | Cylindrical-arranged pluse double-clad optical fibre amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114820 CN1424793A (en) | 2003-01-10 | 2003-01-10 | Cylindrical-arranged pluse double-clad optical fibre amplifiers |
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| CN1424793A true CN1424793A (en) | 2003-06-18 |
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| CN 03114820 Pending CN1424793A (en) | 2003-01-10 | 2003-01-10 | Cylindrical-arranged pluse double-clad optical fibre amplifiers |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147551A (en) * | 2011-04-01 | 2011-08-10 | 国神光电科技（上海）有限公司 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
| CN102248286A (en) * | 2011-06-17 | 2011-11-23 | 山西飞虹激光科技有限公司 | Linear polarization pulse fiber laser processing device |
| CN105896251A (en) * | 2016-05-20 | 2016-08-24 | 北京工业大学 | Optical fiber array amplifier for improving light signal intensity |
| CN113777701A (en) * | 2021-08-27 | 2021-12-10 | 华中科技大学 | Optical fiber wave plate based on space spiral bending |
| CN114978344A (en) * | 2022-07-25 | 2022-08-30 | 中国人民解放军国防科技大学 | Laser signal receiving device and space laser communication system |
-
2003
- 2003-01-10 CN CN 03114820 patent/CN1424793A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147551A (en) * | 2011-04-01 | 2011-08-10 | 国神光电科技（上海）有限公司 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
| WO2012130135A1 (en) * | 2011-04-01 | 2012-10-04 | 国神光电科技（上海）有限公司 | Multimode optical fiber amplifier and multimode optical fiber amplification system |
| CN102147551B (en) * | 2011-04-01 | 2014-08-13 | 国神光电科技（上海）有限公司 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
| CN102248286A (en) * | 2011-06-17 | 2011-11-23 | 山西飞虹激光科技有限公司 | Linear polarization pulse fiber laser processing device |
| CN102248286B (en) * | 2011-06-17 | 2015-05-27 | 山西飞虹激光科技有限公司 | Linear polarization pulse fiber laser processing device |
| CN105896251A (en) * | 2016-05-20 | 2016-08-24 | 北京工业大学 | Optical fiber array amplifier for improving light signal intensity |
| CN105896251B (en) * | 2016-05-20 | 2019-06-14 | 北京工业大学 | Enhance the optical fiber array amplifier of light signal strength |
| CN113777701A (en) * | 2021-08-27 | 2021-12-10 | 华中科技大学 | Optical fiber wave plate based on space spiral bending |
| CN113777701B (en) * | 2021-08-27 | 2022-05-20 | 华中科技大学 | Optical fiber wave plate based on space spiral bending |
| CN114978344A (en) * | 2022-07-25 | 2022-08-30 | 中国人民解放军国防科技大学 | Laser signal receiving device and space laser communication system |
| CN114978344B (en) * | 2022-07-25 | 2022-09-30 | 中国人民解放军国防科技大学 | Laser signal receiving device and space laser communication system |
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