CN118472760B - Annular pumping distributed side pumping optical fiber and optical fiber laser - Google Patents
Annular pumping distributed side pumping optical fiber and optical fiber laser Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 68
- 238000005086 pumping Methods 0.000 title abstract description 83
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- 238000005253 cladding Methods 0.000 claims abstract description 33
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims description 7
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- 230000005540 biological transmission Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
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- 230000008859 change Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
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- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
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Abstract
本发明公开了一种环形泵浦分布式侧面泵浦光纤及光纤激光器，涉及激光信号传输技术领域，环形泵浦分布式侧面泵浦光纤包括外包层、泵浦纤和信号纤；泵浦纤和信号纤均位于外包层内；泵浦纤设置有若干个，当泵浦纤仅设置有一个时，泵浦纤为中心折射率凹陷的环芯光纤；当泵浦纤设置有多个时，至少一个泵浦纤为中心折射率凹陷的环芯光纤。本发明还提供了一种光纤激光器，本发明采用环形光泵浦可将能量集中于泵浦纤外侧，改善泵浦纤至信号纤的整体耦合速率，提升耦合系数k1和k2。
The present invention discloses a ring-pumped distributed side-pumped optical fiber and an optical fiber laser, which relate to the technical field of laser signal transmission. The ring-pumped distributed side-pumped optical fiber comprises an outer cladding, a pump fiber and a signal fiber; the pump fiber and the signal fiber are both located in the outer cladding; there are several pump fibers, when there is only one pump fiber, the pump fiber is a ring-core optical fiber with a depressed central refractive index; when there are multiple pump fibers, at least one pump fiber is a ring-core optical fiber with a depressed central refractive index. The present invention also provides an optical fiber laser, which uses ring light pumping to concentrate energy on the outside of the pump fiber, improve the overall coupling rate from the pump fiber to the signal fiber, and increase the coupling coefficients k1 and k2 .
Description
Technical Field
The invention relates to the technical field of laser signal transmission, in particular to an annular pumping distributed side pumping optical fiber and an optical fiber laser.
Background
In the rapid development of modern technology, fiber lasers play an increasingly important role in a number of fields due to their unique advantages. With the continuous progress of optical fiber technology, pumping technology and laser materials, the performance of the optical fiber laser is remarkably improved. Fiber lasers have achieved a qualitative leap from the initial low power, single mode output to the present high power, multimode output. Fiber lasers exhibit unparalleled potential and application value in high power laser output, long distance transmission, precision machining, and the like. With the advancement of technology and the increase of the application demands of high power and high beam quality, the conventional end-pumped fiber laser gradually has a certain defect in thermal management and nonlinear control. In order to solve the problem, distributed side-coupled cladding-pumped (Distributed side-pump-coupled cladding-pumped, abbreviated as DSCCP, and also called GTwave, composite functional fiber, etc. in different occasions) technology has been developed, and the unique pumping mode and excellent performance thereof have injected new vitality into the development of fiber laser technology.
The DSCCP technology realizes the full coupling of the pump light and the signal light by introducing the pump light at the side surface of the optical fiber. The pumping mode effectively solves the problems in end-face pumping, adopts a preparation method of combining and drawing a plurality of optical fibers, expands the area of pumping light into a gain medium to the whole section of optical fiber, effectively avoids the problem of local heating which is difficult to solve in an end-face pumping beam combiner, and has more excellent performance in nonlinear control and heat distribution. DSCCP fiber lasers provide more ideas in terms of power expansion level and structural design flexibility, and in recent years, attention is paid to the fact that the fiber lasers are different from the traditional fiber lasers in terms of power expansion level and structural design flexibility, and output power is achieved through a series of milestone spanning. The unique structure of the optical fiber is different from the traditional method in the manufacturing process, and the multi-fiber parallel-beam drawing scheme is required to overcome a plurality of problems in the preparation of the traditional optical fiber drawing equipment, including the difficulty in accurately controlling the transverse dimension of the optical fiber, the relative position of a prefabricated rod, the uniformity of materials and the like, so that the high-power design requirement is difficult to achieve.
The conventional double-cladding gain fiber commonly used at present consists of a rare-earth ion doped quartz fiber core, a pure Dan Yingna cladding and a low-refractive-index outer cladding. DSCCP, unlike this, consists of a single signal fiber comprising a core and an inner cladding, and a plurality of multimode pump fibers (N is equal to or greater than 1, and degenerates to conventional double-clad pump fibers when n=0), for convenience of description, the (1+1) -type DSCCP fiber having the simplest structure is described herein, but without loss of generality, all the inventive aspects are applicable to other types of (n+1) -type DSCCP fibers.
In DSCCP pumps, the coupled absorption gain amplification process can be split into two steps. The first step is a side coupling process of pump laser, wherein the pump light is injected through the end face of the pump fiber, then is transmitted in the pump fiber, and is coupled between the pump fiber and the inner cladding of the signal fiber through the tightly attached fiber side face in the form of evanescent wave, and the process determines that the pump light enters the signal fiber from the pump fiber. The second step is an absorption amplification process, in which the pump light coupled into the inner cladding of the signal fiber is absorbed and converted by the doped fiber core in the central region thereof, and the signal light in the fiber core is amplified by gain, and the second step is similar to the gain amplification in the conventional double-cladding gain fiber.
The side coupling characteristic is the side coupling process in the first step, and is closely related to factors such as the size, refractive index, cross-sectional shape, fitting mode and the like of the optical fiber. To quantitatively analyze and evaluate the side coupling capability of the pump fiber and the signal fiber, the introduced coupling coefficients k 1 and k 2,k1 represent the coupling strength of the pump energy from the pump fiber to the signal fiber, and the opposite energy coupling strength is evaluated by the parameter k 2. The positive correlation between the injectable pump power in the optical fiber and the optical fiber diameter d, the numerical aperture NA and the pump laser brightness is maintained, so in order to boost the injectable pump power of the optical fiber to realize higher power output, under the condition that NA is basically difficult to boost, the promotion of the pump brightness and the optical fiber diameter is the most common means.
Under the condition of the brightness (typical high brightness 0.23W/(mu m 2 sr)) of the existing semiconductor pump source (LD), the conventional 400 mu m optical fiber theory can inject pump power of less than 20kW, and the actual injectable power is even lower than 10kW in consideration of the brightness drop in step-by-step beam combination. In order to increase the injection pump power, the diameter of the optical fiber needs to be increased, but in the DSCCP scheme, the coupling coefficient is reduced in an exponential-like manner when other conditions are unchanged, when the diameters of the pump fiber and the signal fiber are synchronously increased from a small size (100 μm) to a medium size (250 μm), the coupling coefficients k 1 and k 2 are reduced by about 2/3, in order to meet certain coupling requirements, the optical fiber needs to be greatly prolonged, and the serious problems of stimulated raman scattering, stimulated brillouin scattering, reabsorption and the like are caused by the overlong optical fiber, so that how to improve the low coupling coefficients k 1 and k 2 of the large-size optical fiber in DSCCP becomes a key problem for realizing high-power DSCCP laser output.
Disclosure of Invention
The invention aims to provide an annular pumping distributed side pumping optical fiber and an optical fiber laser, which are used for solving the problems in the prior art, improving the coupling coefficients k 1 and k 2 and improving the coupling effect.
In order to achieve the above object, the present invention provides the following solutions:
The invention provides an annular pumping distributed side pumping optical fiber, comprising: an outer cladding, a pump fiber and a signal fiber; the pump fiber and the signal fiber are both positioned in the outer cladding layer; the number of the pumping fibers is several, and when only one pumping fiber is arranged, the pumping fibers are ring-core fibers with depressed central refractive indexes; when a plurality of pump fibers are arranged, at least one pump fiber is a ring-core fiber with a depressed central refractive index.
Preferably, the ring-core optical fiber comprises an inner core and an outer ring core which are nested from inside to outside; the inner core has a lower refractive index than the outer core.
Preferably, the ring-core optical fiber comprises an inner core, a middle ring core and an outer ring core which are sequentially nested from inside to outside; the refractive indexes of the middle ring core, the inner core and the outer ring core become larger gradually.
Preferably, the middle ring core is an air core or a solid core.
Preferably, the refractive index distribution of the ring core optical fiber is graded.
Preferably, the refractive index profile of the ring core fiber is stepped.
Preferably, when the pump fibers are provided in plurality, part of the pump fibers are ordinary fibers.
The invention also provides an optical fiber laser, which comprises an annular pumping light source, a laser signal light source and an annular pumping distributed side pumping optical fiber; the annular pumping distributed side pumping optical fiber comprises an outer cladding, a pumping optical fiber and a signal optical fiber; the annular pumping light source is communicated with the signal fiber and transmits a laser signal into the annular pumping light source; the annular pumping light source is communicated with the pumping fiber and transmits annular pumping light into the annular pumping light source.
Preferably, the annular pumping distributed side pumping optical fiber is an annular pumping distributed side pumping optical fiber as described above.
Preferably, the annular pumping light source comprises a forward annular optical pumping source, a reverse pumping beam combiner and a forward pumping beam combiner; the forward annular optical pump source, the forward pump beam combiner and part of the pump fibers are sequentially communicated; the reverse annular optical pump source, the reverse pump beam combiner and the rest of the pump fibers are communicated in sequence;
the laser signal light source comprises a seed source, a first preamplifier, a second preamplifier, a mode field adapter and a first cladding power stripper; the seed source, the first preamplifier, the second preamplifier, the mode field adapter, the first cladding power stripper and the signal fiber are sequentially communicated, and the signal fiber, the second cladding power stripper and the collimation end cap are sequentially communicated.
Compared with the prior art, the invention has the following technical effects:
The invention adopts the annular optical pump to concentrate energy outside the pumping fiber, improves the integral coupling rate from the pumping fiber to the signal fiber, and improves the coupling coefficients k 1 and k 2.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of a ring pump distributed side pump fiber and refractive index profile composed of a common multimode pump fiber and a signal fiber;
FIG. 2 illustrates a ring pump distributed side pump fiber and refractive index profile comprised of a center index depressed pump fiber and signal fiber;
FIG. 3 is a graph showing the distribution of the refractive index and the annular pump distributed side pump fiber composed of the solid core annular pump fiber and the signal fiber;
FIG. 4 shows an air core annular pumping fiber and a signal fiber forming an annular pumping distributed side pumping fiber and refractive index profile;
FIG. 5 is a (n+1) -type annular pumping distributed side pumping fiber composed of a plurality of different pumping fibers;
FIG. 6 is a (N+1) -type annular pumping distributed side pumping fiber composed of multiple identical pumping fibers;
FIG. 7 is a schematic diagram of the (2+1) type annular pump distributed side-pumped fiber annular optical pump principle;
FIG. 8 is a schematic diagram of a (2+1) type annular optical pumping annular pumping distributed side pumping fiber laser;
In the figure:
101-doping a fiber core with a signal fiber;
102-signal fiber cladding;
103-pumping the fiber;
104-Low refractive index coating layer
301-An inner core;
302-a medium ring core;
401-air core;
601-forward annular pump light;
602-forward unabsorbed residual pump light;
603-reverse annular pump light;
604-reverse unabsorbed participated pump light;
605-seed signal light;
606-amplified output signal light.
701-A seed source;
702-a first preamplifier;
703-a second preamplifier;
704-mode field adapter;
705-a first cladding power stripper;
706-reverse residual pump output;
707-forward pump combiner;
708-a forward annular optical pump source;
709-ring pump distributed side pump fiber;
710-a second residual pump output;
711-reverse pump combiner;
712-a reverse annular optical pump source;
713-a second cladding power stripper;
714-collimation end caps.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The inventor of the present invention found that in the conventional DSCCP pump, in the process of coupling pump light energy from the pump fiber to the signal fiber, there is a difference in the coupling rate of different areas on the transverse section of the pump fiber to the signal fiber, so that the pump light coupling in the central area of the pump fiber is slower, even there is a possibility that the pump light coupling is always impossible, which not only results in a longer required fiber length, but also makes part of pump light energy not be absorbed, thereby resulting in a lower DSCCP fiber gain conversion efficiency and a limited fiber output power increase. Based on this, in order to solve the problem, the following scheme is provided.
The embodiment of the invention provides an annular pumping distributed side pumping optical fiber, which is called pumping optical fiber for short, comprising: an outer cladding, a pump fiber and a signal fiber; the pump fiber and the signal fiber are both positioned in the outer cladding layer; the number of the pumping fibers is several, and when only one pumping fiber is arranged, namely the (1+1) pumping fibers, the pumping fibers are ring-core fibers with depressed central refractive indexes; when a plurality of pumping fibers, namely (n+1) pumping fibers, are arranged, at least one pumping fiber is a ring core fiber with a concave central refractive index, it can be understood that when a plurality of pumping fibers are arranged, part of the pumping fibers can be common fibers or all ring core fibers, and the common fibers refer to fibers with consistent refractive indexes of fiber cores.
The pump fiber provided by the embodiment is provided with the ring core fiber, and the pump fiber is used for transmitting the annular pump light, so that the energy of the annular pump light can be concentrated on the outer side (outer ring) of the pump fiber, the integral coupling rate of the pump fiber to the signal fiber is improved, and the coupling coefficients k 1 and k 2 are improved.
The ring core optical fiber at least comprises the following components:
First kind: the ring core optical fiber comprises an inner core 301 and an outer ring core which are nested from inside to outside; the inner core 301 has a lower refractive index than the outer ring core.
Second kind: the ring core optical fiber comprises an inner core 301, a middle core 302 and an outer core which are nested in sequence from inside to outside; the refractive indices of the middle ring core 302, the inner core 301, and the outer ring core become gradually larger.
On a second basis, the middle core 302 may be an air core or a solid core.
In some embodiments, the refractive index profile of the ring-core optical fiber is graded.
In some embodiments, the refractive index profile of the ring-core fiber is stepped.
In the following we will take a (1+1) fiber as an example to describe a pump fiber with a specific pump fiber adapted to a ring spot.
Example 1: ordinary multimode pump optical fiber
The ordinary multimode fiber can transmit the ring laser, so that the conventional (1+1) pump fiber shown in fig. 1 can be used for ring optical pumping, and the ring optical pumping fiber consists of a multimode pump fiber made of pure quartz and a gain fiber doped with a fiber core, and is coated and cured by glue with a low refractive index, wherein in fig. 1:
the signal fiber is doped with the diameter d1 and the refractive index n1 of the fiber core 101;
the diameter d2, refractive index n2 of the signal fiber cladding 102;
the diameter d3, refractive index n2 of the pump fiber 103;
the diameter d4 of the low refractive index coating layer 104, the refractive index n3;
Wherein, in order to ensure the evanescent coupling of the pump light, the pump fiber and the signal fiber cladding must be bonded, and the refractive index of the bonded position is consistent. From the fiber diameter and corresponding refractive index data in FIG. 1, it can be seen that n1> n2> n3; d4> d3≡d2> d1.
Example 2: pump fiber with depressed central refractive index
For better control of the annular optical shift, a low refractive index region may be provided in the central region of the pump fiber, as shown in fig. 2, to suppress the coupling of the annular optical mode to the non-annular mode, as shown in fig. 2:
the central index concave region, diameter d5 of core 301, refractive index n4.
Wherein each parameter relationship has n1> n2> n4> n3, d4> d3≡d2> d1, d3> d5.
Example 3: solid core annular pumping optical fiber
The solid core annular optical fiber is suitable for annular spot transmission and can be controlled by parameters to constrain a particular single mode annular spot transmission. Compared with the example 2, the annular light spot transmission device has the advantages that not only is the central refractive index concave region arranged, but also a layer of concave region with lower refractive index is added in the concave region and the peripheral region, so that annular light spot transmission is realized better.
In fig. 3:
The central refractive index depressed region, diameter d5 of inner core 301, refractive index n4;
The annular index concave region, the diameter d6 of the central annular core 302, has an index of refraction n5.
Wherein each parameter relationship has n1> n2> n4> n5> n3, d4> d3@d2 > d1, d3> d6> d5.
Example 4: air core annular pumping optical fiber
The lower refractive index may be better used for transmission of part of the higher order annular beam than example 3, where the air core annular pumping fiber replaces the refractive index annular recessed region with air. The numbering in fig. 4 is as follows:
401: air core (refractive index n6=1, diameter of annular region between d5 and d 6).
Wherein each parameter relationship has n1> n2> n4> n3> n6=1, d4> d3≡d2> d1, d3> d6> d5.
The above 4 different pump fiber types enable the corresponding pump fibers to perform the transmission of the annular beam, and when a plurality of communicating pump fibers are combined with 1 signal fiber, the (n+1) type pump fiber design can be implemented, as shown in fig. 5, and taking the solid core annular pump fiber in example 3 as an example, the corresponding (2+1), (3+1) and (6+1) type pump fibers can be designed. In addition, different kinds of pump fibers can be used according to the target requirement or the design parameter requirement, as shown in fig. 5-6.
It is emphasized here that the above example only gives the simplest step index design for the depressed region refractive index control scheme, but is not limited thereto, and that graded refractive index is also possible for the depressed region, as long as the result of achieving the refractive index depression is attributable to this.
According to the above-mentioned design concept of the annular pump light and the optical fiber, taking the (2+1) -type central refractive index concave pump optical fiber (example 2) as an example, the design of the high-power optical fiber laser is described, as shown in fig. 6:
601 is forward annular pump light (high power);
602 is the forward unabsorbed residual pump light (very low power);
603 is reverse annular pump light (high power);
604 is the reverse unabsorbed participating pump light (very low power);
605 is seed signal light (low power);
606 is the amplified output signal light (high power).
As shown in fig. 7, the high-power annular pump light is injected into the central refractive index concave pump fiber (example 2) of the DSCPP fiber from the end face through the forward direction and the reverse direction respectively, the region attached to the signal fiber in the middle of the DSCPP fiber enters the signal fiber cladding through side coupling, and then is absorbed by the fiber core, and further amplifies the seed signal light, so that high-power high-brightness signal light output is formed, and the unabsorbed extremely low-power forward and reverse residual pump light is led out from the other side of the pump fiber.
The embodiment of the invention also provides a fiber laser, as shown in FIG. 8, comprising an annular pumping light source, a laser signal light source and a pumping fiber; the pump fiber comprises an outer cladding, a pump fiber and a signal fiber; the annular pumping light source is communicated with the signal fiber and transmits a laser signal into the annular pumping light source; the annular pumping light source is communicated with the pumping fiber and transmits annular pumping light into the annular pumping light source.
The pump fibers may be ordinary pump fibers as described in example 1, or pump fibers as described in examples 2-4.
When the pump fiber as described above is used, it has all the advantages described in the above embodiments, and will not be described here again.
In some embodiments, the annular pump light source includes a forward annular optical pump source 708, a reverse annular optical pump source 712, a reverse pump combiner 711, and a forward pump combiner 707; the forward annular optical pump source 708, the forward pump combiner 707 and a portion of the pump fibers are in communication in sequence; the reverse annular optical pump source 712, the reverse pump combiner 711 and the rest of the pump fibers are sequentially communicated;
The laser signal light source includes a seed source 701, a first preamplifier 702, a second preamplifier 703, a mode field adapter 704, and a first cladding power stripper 705; the seed source 701, the first preamplifier 702, the second preamplifier 703, the mode field adapter 704, the first cladding power stripper 705 and the signal fiber are in communication in sequence, and the signal fiber and the second cladding power stripper 713 and the collimating end cap 714 are in communication in sequence.
The seed source 701, the first preamplifier 702, the second preamplifier 703 and the mode field adaptor 704 can be replaced by a module with a corresponding seed light generation function, such as a resonant cavity, etc., where the forward annular optical pump source 708, the forward pump combiner 707, the backward annular optical pump source 712 and the backward pump combiner 711 can be used independently.
In some alternatives:
the invention can replace the annular light spot (annular pump light) by vector beam and vortex beam with any other type of beam with annular energy light spot intensity.
The invention can change the bidirectional pumping mode into a forward or reverse pumping mode.
The invention can inject annular light spots (annular pump light) into the pump fiber through other spatial optical devices instead of all-fiber forms.
The invention can change the cross section of the pumping fiber into other shapes besides round.
The laser signal light source can comprise a plurality of stages of preamplifiers, is not limited to two stages, and does not need any preamplifiers.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
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| CN100520466C (en) * | 2006-05-30 | 2009-07-29 | 株式会社藤仓 | Multi-port coupler, optical amplifier, and fiber laser |
| JP2012059746A (en) * | 2010-09-06 | 2012-03-22 | Fujikura Ltd | Fiber laser and laser beam machine |
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| CN102298173A (en) * | 2011-08-29 | 2011-12-28 | 武汉安扬激光技术有限责任公司 | Lateral pumped fiber structure and manufacturing method thereof |
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