CN214278468U - All-solid-state microstructure energy transmission optical fiber and high-power optical fiber laser - Google Patents
All-solid-state microstructure energy transmission optical fiber and high-power optical fiber laser Download PDFInfo
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- CN214278468U CN214278468U CN202120377454.6U CN202120377454U CN214278468U CN 214278468 U CN214278468 U CN 214278468U CN 202120377454 U CN202120377454 U CN 202120377454U CN 214278468 U CN214278468 U CN 214278468U
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Abstract
The all-solid-state microstructure energy transmission optical fiber and high-power optical fiber laser comprises a solid-state fiber core and a microstructure cladding, wherein the microstructure cladding is wrapped on the periphery of the fiber core, the microstructure cladding comprises high-refractive-index rods which are arranged in a regular hexagonal lattice mode around the solid-state fiber core and a solid-state substrate filled between the high-refractive-index rods, the central refractive index of the high-refractive-index rods is larger than the refractive index of the solid-state substrate, and the number of layers of the high-refractive-index rods arranged in the regular hexagonal lattice mode is not less than 3. The all-solid-state microstructure energy transmission optical fiber is used as a long-distance transmission optical fiber of high-power optical fiber laser, and when the energy transmission optical fiber transmits the high-power optical fiber laser in a long distance, the stimulated Raman scattering effect in the long-distance transmission process can be inhibited while high-efficiency single-mode transmission of signal wavelength laser is realized by reasonably adjusting the structural parameters of the energy transmission optical fiber.
Description
Technical Field
The utility model belongs to the technical field of high power fiber laser, more specifically relates to an all solid-state microstructure can optic fibre and high power fiber laser ware pass.
Background
High average power laser working in near infrared band (about 1 μm) is widely applied in the fields of industrial processing, national defense and military, biomedical and the like by virtue of the advantages of energy concentration, flexible conversion, small heat affected zone and the like. In recent years, with the development of laser materials, pump coupling, beam combining and other technologies, high average power lasers have been advanced greatly in power enhancement. Taking an industrial continuous wave high-power fiber laser as an example, a single-mode myriawatt industrial grade product is provided by foreign known manufacturers such as an American IPG photon technology company as early as 2013, and myriawatt industrial laser modules developed by domestic known manufacturers such as an Ruike laser, a Bande laser and the like are also successively appeared in recent two years.
Energy transmission using energy transmission optical fiber as medium in industrial processing applicationThe energy transmission means has the advantages of flexible operation, high transmission efficiency, strong environmental adaptability and the like, so the energy transmission means is the preferable energy transmission means for various types of high-power (solid, gas, liquid, semiconductor, optical fiber and the like) laser. In order to meet the application scenes of wide-range processing, the energy transmission optical fiber for transmitting high-power laser from the light source to the working area is preferably not less than 15 m in length. However, as high power laser technology has evolved to completely new power levels, long-distance transmission of kilowatt or megawatt high power lasers has suffered from Stimulated Raman Scattering (SRS) instabilities due to extremely high local optical power densities and limited energy-transfer fiber mode field areas, resulting in passive confinement of their energy-transfer fiber lengths to meters or even tens of centimeters. The length and the mode field area of the optical fiber directly determine the threshold power of the SRS, and the requirements are met
Wherein A iseffIs the area of the mode field, gR(omega) is the Raman gain coefficient, LeffIs the length of the optical fiber. In the long-distance transmission process of high-power laser, the SRS can induce serious laser power fluctuation on one hand, and can generate reflected return light which can damage the laser body on the other hand. Therefore, it is necessary to develop new energy-transmitting optical fibers with high SRS threshold or high SRS suppression level to fully exploit the high-power laser performance.
Currently, energy transmission fiber designs for high power long distance energy transmission applications are primarily Large Mode Area (LMA) fibers. Although many LMA fibers such as multi-groove optical fibers, leakage channel optical fibers, ultra-low NA optical fibers, photonic crystal optical fibers, etc. have been proposed in succession, the above-mentioned fibers are limited in practical applications by the technical problems of poor bending resistance and difficulty in ensuring effective single-mode operation. In addition, the microstructure fiber represented by the photonic crystal fiber has the problems of high welding difficulty, air hole collapse and the like in the application process due to the existence of the air holes in the structure. Industrial grade high power laser mostly adopts all solid state optical fiber structure, so in order to guarantee the high efficiency and the shortcut of the fusion connection, all solid state energy transmission optical fiber should be adopted as much as possible.
In summary, in view of the bottleneck problem faced by the LMA fiber design scheme, how to improve the SRS threshold while considering both the bending resistance and the single-mode performance is a design guide of the current energy-transmitting fiber.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide an all-solid-state microstructure energy-transmitting fiber and a high-power fiber laser.
In order to realize the technical purpose, the utility model discloses a technical scheme does:
the all-solid-state microstructure energy transmission optical fiber comprises a solid-state fiber core and a microstructure cladding, wherein the microstructure cladding is coated on the periphery of the fiber core, the microstructure cladding comprises high-refractive-index rods which are arranged around the solid-state fiber core in a regular hexagonal lattice manner and a solid-state substrate filled among the high-refractive-index rods, and the central refractive index of the high-refractive-index rods is larger than that of the solid-state substrate. The number of the high-refractive-index rods arranged in the regular hexagonal lattice is not less than 3, and the actual number of the high-refractive-index rods can be freely selected according to the size of the cladding of the required optical fiber. Thus, when the bending radius of the energy transmission optical fiber is not less than 20cm, the bending loss of the fundamental mode corresponding to the 1060-1080 nm signal laser wavelength band meets BL <0.1 dB/m.
As a preferred embodiment of the present invention, the solid fiber core is a silica fiber core.
As a preferable embodiment of the present invention, the solid substrate is a solid quartz substrate.
As a preferable embodiment of the present invention, the high refractive index rod is a germanium (Ge) rod, and may be a doped rod containing high refractive index elements such as germanium (Ge) element and titanium (Ti) element.
As the utility model discloses a preferred scheme, the high refractive index stick that is arranged in the inlayer in the regular hexagon dot matrix is near solid-state fibre core, and all high refractive index stick diameters in the regular hexagon dot matrix are d, and the interval at two arbitrary adjacent high refractive index stick centers is Λ, and solid-state fibre core diameter is 2 Λ -d.
In a preferred embodiment of the present invention, a refractive index difference Δ exists between the high refractive index rod and the solid substrate, and Δ ═ n (n) is satisfiedhigh 2-nlow 2)/(2×nhigh 2) Wherein n ishigh、nlowThe refractive index difference delta is typically in the range of 1% to 3% for the central refractive index of the high index rod and the refractive index of the solid matrix, respectively.
Furthermore, by reasonably adjusting the structural parameter design of the all-solid-state microstructure energy transmission optical fiber, the all-solid-state microstructure energy transmission optical fiber can have the following wavelength selective transmission performance: on one hand, the signal laser wavelength band (1060-1080 nm) can be stably transmitted in a low-loss state, and on the other hand, the signal laser wavelength band (1060-1080 nm) shows high loss in a Stimulated Raman Scattering (SRS) Stokes wavelength band (1115-1130 nm), so that the SRS effect in a high-power long-distance transmission process is more effectively inhibited. Specifically, the SRS restraining effect of the all-solid-state microstructure energy transmission fiber is realized by reasonably adjusting the diameter d of the high-refractive-index rod and the refractive index difference delta, and is independent of the central distance Lambda of the adjacent high-refractive-index rods. Preferably, when the typical value refractive index difference Δ is 2%, d is in a range of [4.65 μm,4.9 μm ], and the all-solid-state microstructure energy transmission fiber structure parameters have the most ideal stimulated raman scattering effect suppression performance in this interval.
Preferably, the central distance Lambda between adjacent high refractive index rods is in the range of [8 micrometers, 13.5 micrometers ], so that the optical fiber which is absolutely single-mode running in the 1060 nm-1080 nm wave band can be ensured.
The utility model provides a high power fiber laser, including laser production unit, laser production unit is used for producing high power optic fibre laser, the butt fusion passes can optic fibre as its long distance transmission optic fibre on the output tail optical fiber of laser production unit, it can optic fibre for the aforesaid any kind of all solid-state microstructure biography of biography ability optic fibre to pass.
When the all-solid-state microstructure energy transmission optical fiber transmits high-power optical fiber laser in a long distance, a high-refractive-index rod in a microstructure cladding generates a photonic band gap effect due to anti-resonance coupling, under the condition that a transmission constant is fixed, the wavelength falling outside the photonic band gap is high in loss and cannot be stably transmitted, the light falling in the photonic band gap cannot penetrate through the microstructure cladding so as to be limited in a fiber core for stable transmission, and high-efficiency single-mode transmission of signal wavelength laser is realized; meanwhile, the energy transmission optical fiber can inhibit the stimulated Raman scattering effect in the long-distance transmission process of the high-power optical fiber laser.
Compared with the prior art, the beneficial effects of the utility model include at least:
1. the utility model discloses under the all solid-state microstructure biography energy optical fiber structural parameter of rational design, the photon band gap effect that usable its structure itself produced is with low-loss state stable transmission to signal laser wavelength band (1060 nm-1080 nm), and shows as the high-loss at SRS stokes wavelength band (1115-1130 nm), thereby effectively restrain the SRS effect in the high power long distance transmission process, need not just can possess natural SRS suppression effect with the help of other technical means such as crooked, write tilt grating.
2. The utility model discloses need not rely on great mode field area, but with the mode of high intrinsic loss the SRS effect threshold value has been promoted theoretically.
3. The utility model discloses a surround the arrangement at the peripheral cycle of fibre core and be no less than three-layer high refractive index stick control bending loss, can guarantee the absolute single mode operation of high power laser low-loss in transmission process under the bend radius that is not less than 20 cm.
4. Compare in other types of complicated micro-structure optic fibre such as hollow optic fibre, air hole photonic crystal optic fibre, full solid-state micro-structure biography energy optic fibre is lower with the butt fusion degree of difficulty of laser instrument output tail fiber in the use, and does not have special requirement to butt fusion equipment, is favorable to actual high power laser transmission to be used.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of an all-solid-state microstructure energy-transmitting fiber provided in example 1;
FIG. 2 is a schematic diagram of a loss band distribution of an all-solid-state microstructure energy-transmitting optical fiber provided in example 1 in a non-bending state;
FIG. 3 is a schematic diagram of a calculation result of bending loss of an all-solid-state microstructure energy-transmitting optical fiber signal band provided in example 1;
FIG. 4 is a schematic diagram of the signal band mode field area and power filling factor calculation results in the bending state of the all-solid-state microstructure energy-transmitting fiber provided in example 1;
FIG. 5 is a schematic structural view of example 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solutions of the present invention between the various embodiments can be combined with each other, but it must be based on the realization of the ordinary technical personnel in the field, and when the mutual contradiction or the realization of the combination of the technical solutions occurs, it should be considered that the combination of the technical solutions does not exist, and the present invention is not within the protection scope of the present invention.
Example 1:
the present embodiment provides an all-solid-state microstructure energy transmission fiber, and a schematic cross-sectional structure thereof is shown in fig. 1. The all-solid-state microstructure energy transmission optical fiber comprises a solid-state fiber core 1 and a microstructure cladding, wherein the microstructure cladding is wrapped on the periphery of the solid-state fiber core 1, the microstructure cladding comprises germanium rods 3 which are arranged around the solid-state fiber core 1 in a regular hexagonal lattice mode and a solid-state substrate 2 filled between the germanium rods 3, and the central refractive index of the germanium rods 3 is larger than that of the solid-state substrate 2. The solid core 1 and the solid substrate 2 are made of quartz (Silica), and the number of the high refractive index rods arranged in the regular hexagonal lattice is not less than 3, in this embodiment, 3. Thus, when the bending radius of the energy transmission optical fiber is not less than 20cm, the bending loss of the fundamental mode corresponding to a signal laser wavelength band of 1060-1080 nm meets BL <0.1 dB/m.
The germanium rods 3 located in the innermost layer of the regular hexagonal lattice are close to the solid fiber core 1, the diameters of all the germanium rods 3 in the regular hexagonal lattice are d, the distance between the centers of any two adjacent germanium rods 3 is lambada, and the diameter of the solid fiber core 1 is 2 lambada-d. Specifically, the structural parameters of the energy transmission fiber provided by the present embodiment include: the diameter d of the germanium rod is 4.85 μm, the center distance Lambda between two adjacent high-refractive-index rods is about 12.8 μm, the diameter 2 Lambda-d of the fiber core is about 21.7 μm, and the refractive index difference Delta exists between the high-refractive-index germanium rod and the solid quartz substrate, so that the requirement that Delta is (n) is satisfiedhigh 2-nlow 2)/(2×nhigh 2) 2% where nhigh、nlowRespectively the central refractive index of the high refractive index germanium rod and the refractive index of the solid quartz substrate, nlowThe value is 1.45 of the refractive index of a typical quartz material.
Under the above structural parameters, the loss band distribution of the energy transmission fiber provided by this embodiment in the non-bending state is calculated by using the full vector finite element method, and the result is shown in fig. 2. On the one hand, high loss of the Stimulated Raman Scattering (SRS) stokes wavelength band (1115-1130 nm) is achieved by designing it between the 2nd and 3rd loss bands; on the other hand, a signal laser wavelength band (1060 to 1080nm) is designed in a 3rd loss band region to realize low-loss transmission.
The energy transmission fiber provided by the embodiment considers not only the wavelength dependent loss but also the bending loss in the transmission of the signal band wavelength laser according to the practical application. Only the wavelength-dependent loss of the energy-transmitting optical fiber is controlled well, the energy-transmitting optical fiber can have the function of SRS inhibition; only by controlling the mode bending loss of the energy-transmitting optical fiber in the signal band, the high-efficiency transmission of the laser can be realized.
Under the structural parameters of the optical fiber provided by the present implementation, the optical fiber satisfies absolute single mode operation, that is, only fundamental mode transmission is supported, and other high-order modes are not existed. Fig. 3 shows the signal band bending loss of the optical fiber provided in the present embodiment in the straight state and the 20cm bending radius, respectively. The result shows that the optical fiber can still ensure negligible bending loss of the fundamental mode of the signal band under the bending radius of 20cm, and has high-efficiency transmission capability.
Further, as shown in FIG. 4, when the bending radius is 20cm, the optical fiber provided in this embodiment can ensure a wavelength of about 200 μm at 1070 nm2The mode field area and the fundamental mode power filling factor in the fiber core are larger than 0.92, and the fiber has ideal bending performance.
Example 2:
referring to fig. 5, the present embodiment provides a high power fiber laser, which includes a laser generating unit 201 for generating a high power fiber laser, an output pigtail 202 of the laser generating unit is welded with an energy transmitting fiber 203 as a long-distance transmission fiber thereof, and finally, a signal laser is transmitted to a collimator 205 via a relay fiber 204 for output. Due to the single-mode characteristic of the energy transmission optical fiber and the natural SRS restraining effect, the laser transmission system can ensure long-distance single-mode transmission of high-power laser and avoid the SRS effect. A schematic cross-sectional structure of the energy transmission fiber is shown in fig. 1, and the structure and parameter design of the energy transmission fiber are the same as those of embodiment 1, which are not described herein again.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that the present invention is not limited thereto, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention.
Claims (10)
1. The all-solid-state microstructure energy transfer optical fiber is characterized by comprising a solid-state fiber core and a microstructure cladding, wherein the microstructure cladding is coated on the periphery of the fiber core, the microstructure cladding comprises high-refractive-index rods which are arranged in a regular hexagonal lattice mode around the solid-state fiber core and a solid-state substrate filled between the high-refractive-index rods, the central refractive index of the high-refractive-index rods is larger than the refractive index of the solid-state substrate, and the number of layers of the high-refractive-index rods arranged in the regular hexagonal lattice mode is not less than 3.
2. The all-solid-state microstructured energy transmitting fiber of claim 1, wherein the solid core is a silica core.
3. The all solid state microstructured energy transmitting fiber of claim 1, wherein the solid substrate is a solid quartz substrate.
4. An all-solid-state microstructured energy transmitting fiber according to claim 1, 2 or 3, wherein the high refractive index rod is a germanium rod.
5. The all-solid-state microstructure energy transmission fiber according to claim 1, wherein the high refractive index rods located at the innermost layer in the regular hexagonal lattice are close to the solid-state fiber core, all the high refractive index rods in the regular hexagonal lattice have a diameter of d, the distance between the centers of any two adjacent high refractive index rods is Λ, and the diameter of the solid-state fiber core is 2 Λ -d.
6. The all-solid-state microstructured energy transmitting fiber of claim 5, wherein a refractive index difference Δ exists between the high-index rod and the solid substrate, and Δ ═ n (n) is satisfiedhigh 2-nlow 2)/(2×nhigh 2) Wherein n ishigh、nlowThe refractive index of the high refractive index rod center and the refractive index of the solid matrix are respectively, and the value range of the refractive index difference delta is between 1% and 3%.
7. The all-solid-state microstructured energy transmitting fiber of claim 6, wherein the stimulated Raman scattering suppression efficiency is achieved by adjusting the high-index rod diameter d and the refractive index difference Δ.
8. The all-solid-state microstructured energy transmitting fiber of claim 7, wherein the high-index rod diameter d has a value in the range of [4.65 μm,4.9 μm ] when the difference in refractive index is 2%.
9. An all-solid-state microstructured energy transmitting fiber according to claim 6, 7 or 8, wherein the pitch Λ between adjacent high refractive index rods is in the range of [8 μm,13.5 μm ].
10. A high-power optical fiber laser comprises a laser generating unit, wherein the laser generating unit is used for generating high-power optical fiber laser, an output tail fiber of the laser generating unit is welded with an energy transmission optical fiber as a long-distance transmission optical fiber thereof, and the high-power optical fiber laser is characterized in that: the energy transmission fiber is the all-solid-state microstructure energy transmission fiber as claimed in claim 1.
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| CN114035265A (en) * | 2021-11-29 | 2022-02-11 | 湖南大学 | Photonic crystal fiber transmission system suitable for ultra-long distance transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114035265A (en) * | 2021-11-29 | 2022-02-11 | 湖南大学 | Photonic crystal fiber transmission system suitable for ultra-long distance transmission |
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