CN108572420B - Bidirectional optical fiber end cap with laser beam expansion output and reflection functions and application thereof - Google Patents
Bidirectional optical fiber end cap with laser beam expansion output and reflection functions and application thereof Download PDFInfo
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- CN108572420B CN108572420B CN201810801530.4A CN201810801530A CN108572420B CN 108572420 B CN108572420 B CN 108572420B CN 201810801530 A CN201810801530 A CN 201810801530A CN 108572420 B CN108572420 B CN 108572420B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 124
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 13
- 239000010453 quartz Substances 0.000 claims abstract description 83
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000000835 fiber Substances 0.000 claims abstract description 68
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 238000005253 cladding Methods 0.000 claims description 22
- 238000002834 transmittance Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 9
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004372 laser cladding Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0905—Dividing and/or superposing multiple light beams
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A bidirectional optical fiber end cap with laser beam expanding output and reflection functions comprises an optical fiber (11) and a quartz block (12); the quartz block (12) is of an integral structure formed by sequentially connecting a round table (18), a column body (19) and an output curved surface body (14) with the same end face size; one end face of the optical fiber (11) is welded with the smaller end face of the round table (18) to form an interface (13); the central line extension line of the fiber core of the optical fiber (11) is the central line of a round table (18), a cylinder (19) and an output curved surface body (14); the curved surface of the output curved surface body (14) takes the intersection point of the central extension line of the fiber core of the optical fiber (11) and the interface (13) as a sphere center, and takes the sum of the lengths of the central line of the quartz block (12) in the round table (18), the cylinder (19) and the output curved surface body (14) as a curvature radius, and the curved surface is plated with a film layer with certain reflection/transmission rate.
Description
Technical Field
The present invention relates generally to the field of fiber lasers, and more particularly to a bi-directional fiber end cap with both laser beam expansion output and reflection functions.
Background
The high-power fiber laser has wide application in the fields of laser cutting, laser cladding, 3D printing and the like. In recent years, with the improvement of the manufacturing process of double-clad optical fibers and the power of a high-brightness semiconductor laser, the output power of single-path high-power optical fiber laser is rapidly developed, and the output power is improved from 100W at the beginning of 21 st century to 10 kilowatts at present. As the output power of fiber laser increases, the power density in the fiber core increases. In the process of cutting, grinding, polishing and the like, the output end face of the optical fiber inevitably leaves defects and damages on the end face of the optical fiber, so that a local electric field is enhanced, and material damage is caused, therefore, in a high-power optical fiber laser system, the processing of the output end face of the optical fiber is an important core technology. The optical fiber end cap is a high-power optical fiber passive device for protecting the end face of the optical fiber, and the optical power density of the output end is reduced by expanding the output light beam, so that the end face of the optical fiber is protected from being damaged.
Conventional fiber end caps are mainly used for independent output or independent input of fiber lasers. At present, a plurality of optical fiber end caps with a light beam output function are applied in the field of optical fiber lasers, and the functions of light beam expansion and output end face protection are achieved by welding an energy transmission optical fiber with a conical quartz block; such an optical fiber end cap needs to be coated with an antireflection film on the end face to strictly prevent laser damage caused by laser feedback, and thus has only a laser output function. In the field of optical fiber coupling semiconductor lasers, in order to realize pluggable optical fiber pigtails, more optical fiber end caps with laser coupling functions are used, and laser input in space is coupled into an energy-transmitting optical fiber core through a conical optical fiber end cap; the end cap of the optical fiber also needs to be plated with an antireflection film on the end face, so that the laser coupling efficiency is ensured, and the thermal effect and the optical fiber damage caused by the laser power loss are avoided.
Currently, in conventional applications such as output beam expansion and input coupling, high power transmission efficiency of the fiber end cap is required, while avoiding feedback that may cause system instability. Therefore, there is no bidirectional fiber end cap capable of providing both output and reflection functions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the bidirectional optical fiber end cap with the functions of laser beam expansion output and reflection, which can realize laser beam expansion output and simultaneously reflect and couple laser into an optical fiber core.
The technical scheme of the invention is as follows: the bidirectional optical fiber end cap with the laser beam expanding output and reflection functions is characterized by comprising an optical fiber and a quartz block connected with the optical fiber; the quartz block is an integrated structure formed by sequentially connecting a round table, a cylinder and an output curved surface body, wherein the end surfaces of the round table, the cylinder and the output curved surface body are identical in size; one end face of the optical fiber is welded with the smaller end face of the round table of the quartz block to form an interface; the extension line of the central line of the fiber core of the optical fiber is the central line of a round table, a cylinder and an output curved surface body of the quartz block; the curved surface of the output curved surface body of the quartz block takes the intersection point of the central extension line of the fiber core of the optical fiber and the interface as a sphere center, and the sum of the lengths of the central line of the quartz block in the round table, the cylinder and the output curved surface body as a curvature radius, so that the light beam reflected by the curved surface can effectively enter the fiber core of the optical fiber; the curved surface of the output curved surface body of the quartz block is plated with a film layer which is matched with the laser wavelength and has a preset laser reflection/transmittance ratio, so that the laser reflectivity of the film layer is between 0% and 100%, the laser transmittance is between 100% and 0%, different output and reflection power ratios are realized, laser enters the quartz block from an interface through the fiber core, laser spots are transmitted and expanded in the quartz block, and the laser beams after the expansion are output and reflected by the curved surface end of the output curved surface body of the quartz block.
Further, the optical fiber is an optical fiber for laser generation and transmission, and is a gain optical fiber doped with rare earth particles or an energy transmission optical fiber not doped with rare earth particles; and the cross-sectional structure of the optical fiber is selected from one of single cladding, double cladding and triple cladding.
Further, the fiber core diameter of the optical fiber is in the range of 10-200 microns, and when the cross section structure of the optical fiber is a double-cladding structure, the inner cladding diameter is between 100-1000 microns; the overclad diameter is between 250 and 2000 microns.
Further, the smaller end face of the round table of the quartz block is 2-5 times of the diameter of the outermost cladding layer of the optical fiber.
Furthermore, the welding interface of the optical fiber and the quartz block is a smooth plane, and the smooth plane is perpendicular to the length direction of the optical fiber and the quartz block and the laser transmission direction. Furthermore, the cylinder of the quartz block is used for mechanical clamping and fixing of the optical fiber end cap, the diameter of the cylinder is between 3 and 500 millimeters, the length of the cylinder is between 10 and 100 millimeters, the length of the cylinder is designed according to the size of a beam to be expanded, and the beam expansion of laser is realized while the transmission of the laser in the end cap is ensured.
Further, the cylinder is a cylinder.
The invention also provides application of the bidirectional optical fiber end cap with the laser beam expanding output and reflection functions in a single-end pumping all-fiber laser oscillator or a double-end pumping all-fiber laser oscillator. Plating a total reflection film on the bidirectional end cap to form a total reflection optical fiber end cap, which is used for replacing a high reflection grating in the traditional total optical fiber oscillator; the two-way end cap is plated with a 10% reflection and 90% transmission film to form a partially transmission optical fiber end cap, which is used for replacing a low reflection coupling-out grating in a traditional all-fiber oscillator. The total reflection optical fiber end cap and the partial reflection optical fiber end cap form a feedback cavity of the optical fiber laser, and the output of the oscillator of the total optical fiber can be realized by combining a pumping source and a gain optical fiber. Because the fiber end cap has high bearing power, the all-fiber laser oscillator formed by the total reflection fiber end cap and the partial reflection fiber end cap has higher output power than the traditional fiber grating oscillator.
In the invention, the following components are added: because the output end face of the optical fiber is welded with the input end face of the quartz block, an interface is formed; laser enters the quartz block from the interface through the optical fiber, and laser spots are transmitted and expanded in the quartz block; the output end face of the quartz block is a specially designed curved surface, and is coated with a film with a certain reflectivity, so that the laser can be returned to the fiber core after being reflected by the curved surface end face while the laser output beam expansion is realized. When the laser is transmitted to the output end face of the quartz block, part of the laser is output from the output end face of the quartz block in a beam expanding way, and part of the laser is reflected back to the fiber core of the optical fiber by the output end face, so that the beam expanding output and the laser reflection feedback of the laser are realized.
The basic principle of the invention is as follows:
in the optical system, for imaging of a radius of curvature mirror of R', the object-image relationship satisfies gaussian formula (1):
when the central vertex of the concave mirror is taken as the origin of coordinates, x is the abscissa of the object, x' is the abscissa of the image, and r is the geometric radius of the concave mirror.
In the present invention, the object is a light spot at the output end face of the optical fiber, such as a light spot reflected back at the end face of the optical fiber by the curved surface of the end cap. In the invention, the output light spot of the optical fiber end face and the light spot fed back to the optical fiber end face by the end cap are required to be on the same plane, namely the output light beam and the feedback light beam are overlapped at the optical fiber end face, from the perspective of object image relation, the required object and the image are on the same plane vertical to the optical axis, and the requirements of x=x ', r= -R' are met, and can be solved:
x＝x'＝-R′ (2)
using formula (2), according to the formula of the vertical axis magnification β and the angle magnification γ of the gaussian optical system, there are:
here, the vertical axis magnification β= -1, which illustrates that the image is equal and inverted, i.e. the object image is axisymmetric about the optical axis, because the object here is a light spot at the output end face of the optical fiber, such as a light spot reflected by the end cap curved surface back to the end face of the optical fiber, this ensures that the light reflected by the end cap can be totally reflected back into the fiber core. The angular expansion ratio γ=1 indicates that the opening angle of the object emitted light is equal to the opening angle of the image received light, and in the optical fiber, the opening angle corresponds to the beam divergence angle determined by the numerical aperture NA of the optical fiber, which ensures that the reflected light can be effectively incident into the fiber core and is limited to be efficiently transmitted within the numerical aperture determined by the fiber core.
To integrate the above analysis, in order to achieve the return of the output beam after reflection into the fiber core, the central optical axis of the fiber core coincides with the central optical axis of the quartz block, and the radius of curvature R' of the output surface of the quartz block is equal to the length L of the quartz block in the optical axis direction; i.e.
R′＝-r＝-L (4)
The invention designs the output end face of the common optical fiber end cap into a special spherical surface with the curvature radius equal to the length L of the quartz block along the optical axis direction, and is plated with a film which is matched with the laser wavelength and has a certain reflectivity, and the feedback of laser is realized while outputting laser criteria. Laser in the optical fiber enters the quartz block from the welding surface, and a laser spot is transmitted in the quartz block and expands the beam; when the laser is transmitted to the output end face of the quartz block, a part of the laser is output from the output end face of the quartz block in a beam expanding way, and a part of the laser is reflected back to the fiber core of the optical fiber by the output end face, so that the output beam expanding and feedback of the laser are realized.
The invention can achieve the following technical effects:
1. and meanwhile, the beam expansion, laser reflection and feedback of the fiber laser are realized: by utilizing the divergence characteristic of laser, when the optical fiber output laser is transmitted in the quartz block, the beam spot is naturally expanded, and by reasonably designing the quartz block and changing the transmission distance of the laser in the quartz block, the light spot output with different sizes can be realized; through a reasonably designed output curved surface, the light beam reflected by the curved surface can be ensured to be effectively incident into the fiber core; the feedback of laser can be realized by plating a reflecting film layer with a certain reflectivity on the output end face of the quartz block.
2. Laser output and reflection with different output power and reflection power ratios (0-100%) can be realized by plating film layers with different reflectivities on the output end face of the quartz block, typically 100% power transmission and 100% power feedback can be realized; the device can replace the traditional fiber grating, fiber total reflection mirror and other devices, and is used in a high-power fiber oscillator and other systems which need to realize laser output and reflection at the same time.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of a bidirectional fiber end cap with laser beam expanding output and reflection functions according to an embodiment of the present invention;
FIG. 2 is a schematic view of a fiber end cap with total reflection in embodiment 1 of the present invention;
FIG. 3 is a schematic view of a fiber end cap with half-transmitting and half-reflecting function in embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the invention better.
Example 1
A bidirectional optical fiber end cap with laser beam expanding output and reflection functions is shown in fig. 1, and comprises an optical fiber 11 and a specially designed quartz block 12: the optical fiber 11 can be double-clad fiber, and consists of a fiber core 15, an inner cladding 16 and an outer cladding 17, or can be single-clad fiber, and consists of a fiber core 15 and a cladding 17; the quartz block 12 is an integral structure formed by sequentially connecting a round table 18, a cylinder 19 and an output curved surface body 14, wherein the sizes of the connecting end surfaces of the round table 18 and the cylinder are the same; the output end face of the optical fiber 11 is welded with the input end face of the quartz block 12 (namely the smaller end face of the round table 18) to form an interface 13; after being transmitted to the interface 13 from the optical fiber core 15, the laser enters the quartz block 12, and after passing through the round table 18 area and the column 19 area of the quartz block, the laser naturally expands beams and reaches the curved surface of the output curved surface body 14; the output curved surface body 14 of the quartz block 12 takes the intersection point of the central extension line of the fiber core of the optical fiber 11 and the interface 13 as a sphere center, takes the length sum of the central line of the quartz block 12 in the round table 18, the cylinder 19 and the output curved surface body 14 as a sphere crown with curvature radius, the curved surface of the output curved surface body 14 is plated with a reflecting film for the laser wave band, the laser can be reflected while the beam expansion output is carried out on the beam expansion laser, the laser is fed back into the quartz block 12, and the original path is fed back into the fiber core 15 of the optical fiber 11; laser output and feedback with different output power and feedback power ratios (0-100%) can be achieved by coating the curved surface of the output curved surface body 14 of the quartz block 12 with film layers with different reflectivity/transmissivity ratios.
Example 2
An optical fiber end cap with total reflection function, the structure of which is shown in fig. 2, comprises an optical fiber 11 and a specially designed quartz block 12: the optical fiber 11 can be double-clad fiber, and consists of a fiber core 15, an inner cladding 16 and an outer cladding 17, or can be single-clad fiber, and consists of a fiber core 15 and a cladding 17; the quartz block 12 is an integral structure formed by sequentially connecting a round table 18, a cylinder 19 and an output curved surface body 14, wherein the sizes of the connecting end surfaces of the round table 18 and the cylinder are the same; the output end face of the optical fiber 11 is welded with the input end face of the quartz block to form an interface 13; the laser is transmitted from the core 15 of the optical fiber 11 to the interface 13 and then enters the quartz block 12; the laser passes through the round table 18 area and the column 19 area of the quartz block in sequence to expand naturally, and then reaches the curved surface of the output curved surface body 14. The quartz block 12 output curved surface body 14 is a spherical crown taking the intersection point of the central extension line of the fiber core and the interface 13 as a spherical center and taking the sum of the lengths of the central line of the quartz block 12 in the round table 18, the cylinder 19 and the output curved surface body 14 as the curvature radius; the output curved surface body 14 is coated with a total reflection film for the laser wave band, and the laser is fed back to the quartz block 12 entirely and returned to the core 15 of the optical fiber 11 in the original path, and in this process, no laser is output from the output curved surface body 14. The optical fiber end cap with the total reflection function of the embodiment can be used as a high reflection mirror of an all-fiber oscillator to replace the traditional high reflection fiber bragg grating.
Example 3
A bidirectional optical fiber end cap with semi-transmission and semi-reflection functions is shown in a structural schematic diagram in FIG. 3, and comprises an optical fiber 11 and a specially designed quartz block 12: the optical fiber 11 can be double-clad fiber, and consists of a fiber core 15, an inner cladding 16 and an outer cladding 17, or can be single-clad fiber, and consists of a fiber core 15 and a cladding 17; the quartz block 12 is an integral structure formed by sequentially connecting a round table 18, a cylinder 19 and an output curved surface body 14, wherein the sizes of the connecting end surfaces of the round table 18 and the cylinder are the same; the output end face of the optical fiber 11 is fused with the input end face of the quartz block 12 to form an interface 13. The laser light is transmitted from the core 15 of the optical fiber 11 to the interface 13 and then enters the quartz block 12. The laser passes through the round table 18 area and the column 19 area of the quartz block in sequence to expand naturally, and then reaches the curved surface of the output curved surface body 14. The output curved surface body 14 of the quartz block 12 is a spherical crown taking the intersection point of the central extension line of the fiber core and the interface 13 as a spherical center and taking the sum of the lengths of the central line of the quartz block 12 in the round table 18, the cylinder 19 and the output curved surface body 14 as the curvature radius; the output curved surface body 14 is coated with a semi-transparent and semi-reflective film for the laser wave band, and can reflect the laser while performing beam expansion output on the laser after beam expansion, and the laser is fed back to the quartz block 12 and is returned to the core 15 of the optical fiber 11 in the original path. By coating the curved surface of the output end surface body 14 of the quartz block 12 with a semi-transparent and semi-reflective film, output power and feedback power distribution with a ratio of 1:1 are realized. The semi-transparent and semi-reflective bidirectional optical fiber end cap of the embodiment can be used as an output coupling reflector of an all-fiber oscillator to replace the traditional low-reflection output coupling fiber grating.
It can be seen that the key difference between the above 3 embodiments is that the coating on the output curved body 14 is different: the output curved surface body 14 in the total reflection end cap is plated with a high reflection film, the reflectivity is 100%, and no transmitted light exists; the output curved surface body 14 in the high-transmittance end cap is plated with a high-transmittance film, the transmittance is 100%, and no reflection exists; the output curved surface body 14 in the half-reflecting end cap is plated with a half-reflecting film, or is reflected: transmission = 1:1 film, 50% reflection, 50% transmission. Other reflectivities may of course be plated: films of transmission ratios, achieving different reflection/transmission ratios.
The invention has the following optimized design ideas: the two-way optical fiber end cap with the functions of laser beam expansion output and reflection comprises an optical fiber 11 and a quartz block 12, wherein one end face (laser output end face) of the optical fiber 11 is welded with one end face (laser input end face) of the quartz block 12, and the other end face (laser output end face, namely the curved face of an output curved face body 14) of the quartz block is a curved face with special design and is plated with a film with a certain reflectivity; the quartz block 12 is an integral body formed by sequentially combining a round table 18, a cylinder 19 and an output curved surface body 14, wherein the small end of the round table 18 is welded with the optical fiber 11, the large end of the round table 18 is integrated with the cylinder 19, the cylinder 19 is used for mechanical clamping and fixing of an optical fiber end cap, and the curved surface of the output curved surface body 14 can ensure that laser can return to the fiber core 15 of the optical fiber 11 after being reflected by the output curved surface while realizing output laser beam expansion light; the output end face of the optical fiber 11 is a smooth plane and is perpendicular to the length direction of the optical fiber and the laser transmission direction; the input end face of the quartz block 12 is a smooth plane and is perpendicular to the length direction of the quartz block and the laser transmission direction; the optical fiber output end face and the quartz input end face are effectively welded, the formed interface 13 is also a smooth plane, and is perpendicular to the length direction of the optical fiber 11, the length direction of the quartz block 12 and the laser transmission direction, so that the laser can be efficiently transmitted from the optical fiber to the quartz.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. The bidirectional optical fiber end cap with the functions of laser beam expansion output and reflection is characterized by comprising an optical fiber (11) and a quartz block (12) connected with the optical fiber (11);
the quartz block (12) is of an integrated structure formed by sequentially connecting a round table (18), a column (19) and an output curved surface body (14) with the same size on the connecting end surface;
one end face of the optical fiber (11) is welded with the smaller end face of the round table (18) of the quartz block (12) to form an interface (13);
the central line extension line of the fiber core of the optical fiber (11) is the central line of a round table (18) and a column body (19) of the quartz block (12) and the output curved surface body (14);
the surface of the output curved surface body (14) of the quartz block (12) takes the intersection point of the central extension line of the fiber core of the optical fiber (11) and the interface (13) as a sphere center, and the sum of the lengths of the central line of the quartz block (12) in the round table (18) and the column body (19) and the output curved surface body (14) is taken as a spherical crown with the curvature radius;
the surface of the output curved surface body (14) of the quartz block (12) is plated with a film layer which is matched with the laser wavelength and has a preset laser reflection/transmittance ratio;
the optical fiber (11) is an optical fiber for laser generation and transmission, and is a gain optical fiber doped with rare earth particles or an energy transmission optical fiber not doped with rare earth particles; and the cross-sectional structure of the optical fiber (11) is selected from one of the optical fiber cross-sectional structures of single cladding, double cladding and triple cladding structures;
the diameter of the fiber core of the optical fiber (11) is in the range of 10-200 micrometers, and when the cross section structure of the optical fiber (11) is a double-cladding structure, the diameter of the inner cladding is between 100 and 1000 micrometers; the diameter of the outer cladding is between 250 and 2000 microns; the smaller end face of the round table (18) of the quartz block (12) is 2-5 times of the diameter of the outermost cladding of the optical fiber (11);
the cylinder (19) of the quartz block (12) is used for mechanical clamping and fixing of the optical fiber end cap, the length of the cylinder is between 10 and 100 mm, and the diameter of the cylinder is between 3 and 500 mm.
2. The bi-directional optical fiber end cap with the laser beam expanding output and reflection functions according to claim 1, wherein the interface (13) of the optical fiber (11) and the quartz block (12) in fusion connection is a smooth plane, and the smooth plane is perpendicular to the length direction of the optical fiber (11), the quartz block (12) and the laser transmission direction.
3. The bi-directional fiber optic end cap with both laser beam expansion output and reflection according to claim 1, wherein the cylinder (19) is a cylinder.
4. A bi-directional fiber end cap with both laser beam expansion output and reflection according to any of claims 1-3, characterized in that it is applied in single-end pumped all-fiber laser oscillators or double-end pumped all-fiber laser oscillators.
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| CN201810801530.4A CN108572420B (en) | 2018-07-20 | 2018-07-20 | Bidirectional optical fiber end cap with laser beam expansion output and reflection functions and application thereof |
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| CN201810801530.4A CN108572420B (en) | 2018-07-20 | 2018-07-20 | Bidirectional optical fiber end cap with laser beam expansion output and reflection functions and application thereof |
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| CN113325517B (en) * | 2021-08-03 | 2021-10-15 | 中国工程物理研究院激光聚变研究中心 | Optical fiber end cap and optical fiber laser |
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