WO2022149358A1 - Dispositif laser, dispositif de communication optique sans fil sous-marin et dispositif d'usinage laser - Google Patents

Dispositif laser, dispositif de communication optique sans fil sous-marin et dispositif d'usinage laser Download PDF

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Publication number
WO2022149358A1
WO2022149358A1 PCT/JP2021/042518 JP2021042518W WO2022149358A1 WO 2022149358 A1 WO2022149358 A1 WO 2022149358A1 JP 2021042518 W JP2021042518 W JP 2021042518W WO 2022149358 A1 WO2022149358 A1 WO 2022149358A1
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Prior art keywords
fiber
laser
laser light
fibers
core
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PCT/JP2021/042518
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English (en)
Japanese (ja)
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隼規 坂本
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株式会社島津製作所
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Priority to JP2022573936A priority Critical patent/JPWO2022149358A5/ja
Publication of WO2022149358A1 publication Critical patent/WO2022149358A1/fr

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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
    • 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
    • G02B6/26—Optical coupling means
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/287—Structuring of light guides to shape optical elements with heat application
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water

Definitions

  • This disclosure relates to a laser device, an underwater optical wireless communication device, and a laser processing device.
  • Patent Document 1 describes a rectangular fiber having a mode scramble effect fused and connected to a non-rectangular fiber.
  • Patent Document 2 describes a plurality of fibers bundled at a tapered portion and coupled to one fiber.
  • Patent Document 2 proposes a method of constructing a fiber combiner using polygonal fibers and suppressing heat generation at the combiner coupling portion.
  • a fiber combiner is an optical component manufactured by bundling a plurality of fibers, melting and stretching them, and fusing them with one fiber.
  • Laser light input to a plurality of fibers can be emitted from one fiber, and is utilized in applications such as efficiently collecting light sources for clad excitation of a fiber laser. Further, in the fiber combiner, laser light input in the opposite direction, that is, one fiber, can be emitted from a plurality of fibers.
  • the beam profile of the laser beam emitted from the fiber has a correlation with the beam profile of the laser beam incident on the fiber. That is, the laser light incident from a high NA (numerical aperture) having a large incident angle has a high NA component at the time of fiber exit, and the laser light incident from a low NA having a small incident angle has a low NA component at the time of fiber exit. Tend. As the laser beam propagates through the fiber, this tendency is alleviated and homogenized. However, when a sufficient fiber length cannot be secured or when the fiber core diameter is large, it tends to be difficult to make them uniform.
  • the incident NA of the laser beam is limited by the distance between the emission points between the laser light sources.
  • the fibers of this laser device are connected to a junction such as a fiber combiner and branched by multiple fibers, the output of each fiber varies and is not uniformed thereafter, resulting in emission from each fiber. There is a problem that the output of the laser beam to be generated varies.
  • the present disclosure has been made in view of the actual circumstances, and one purpose of the present disclosure is to provide a laser device capable of suppressing variations in the output of laser light emitted from a plurality of fibers.
  • a laser device includes a plurality of laser light sources, an optical transmission unit, and one or more condensing optical elements.
  • the plurality of laser light sources emit laser light.
  • the optical transmission unit receives the laser light emitted from the plurality of laser light sources from one end and emits the laser light from the other end.
  • the one or more condensing optical elements condense the laser light emitted from the plurality of laser light sources and make it incident on one end of the optical transmission unit.
  • the optical transmission unit includes a first fiber, a second fiber, and a junction.
  • the first fiber has a portion that is one and is one end.
  • the second fiber has two or more portions that are the ends of the other.
  • the junction connects a portion opposite to one end of the first fiber and a portion opposite to the other end of the plurality of second fibers.
  • the joints are arranged so that the cores of the plurality of second fibers are contained in the cores of the first fiber having a polygonal cross-sectional shape, and the cores of the first fiber and the cores of the plurality of second fibers are fused. It is connected.
  • the underwater optical wireless communication device includes a laser device.
  • the underwater optical wireless communication device is used underwater and transmits a signal by a laser beam to perform communication.
  • a laser processing device includes a laser device.
  • the laser processing device simultaneously emits laser light in a plurality of directions to perform laser welding.
  • the laser beam is made uniform, which is useful for a device that emits the laser beam in multiple directions.
  • a laser light source capable of radiating a laser beam having a uniform power and beam profile in the entire underwater space is desired.
  • the wireless communication device can efficiently fill the space.
  • a laser processing apparatus for example, it is possible to irradiate a circumference having a uniform beam profile and a laser beam having a laser beam power at intervals of 120 degrees, which is useful for welding cylindrical parts and the like.
  • the underwater optical wireless communication device 51 and the laser device 50 according to the first embodiment will be described.
  • the underwater optical wireless communication device 51 is configured to include the laser device 50.
  • FIG. 1 is a diagram showing a laser device 50 according to the first embodiment.
  • FIG. 2 is a diagram showing a laser housing 100.
  • FIG. 3 is a diagram showing LD40.
  • 4A and 4B are diagrams showing an output state of the underwater optical wireless communication device 51.
  • the laser device 50 includes a laser housing 100 and an optical transmission unit 30.
  • the optical transmission unit 30 includes a fiber 7, a plurality of fibers 13, and a fiber combiner 8 as a junction.
  • the laser light emitted from the laser housing 100 is emitted as a plurality of laser beams 11 via the optical transmission unit 30.
  • the laser housing 100 includes a plurality of high-power laser diodes (hereinafter, simply referred to as “LD”) 40 and one or more condensing optical elements as a laser light source.
  • LD high-power laser diodes
  • Each of the plurality of LD40s emits a laser beam.
  • one or more condensing optical elements are composed of a collimating lens 2, a beam expander 5, and a condensing lens 6. With these condensing optical elements, the laser light emitted from the plurality of LD40s is condensed and incident on one end of the optical transmission unit 30 (left side in the figure).
  • the multiple LD40s have LD chips contained in a ⁇ 9.0 package and have high heat dissipation performance.
  • the LD40 is housed in the holder 1a.
  • the collimating lens 2 is housed in the holder 2a.
  • collimated light having a desired beam profile can be obtained.
  • the positional relationship between the plurality of LD40s and the collimating lens 2 is fixed by YAG laser welding between the holder 1a and the holder 2a via the connecting pipe 3.
  • the collimated plurality of laser beams 4 reduce the beam diameter by the beam expander 5.
  • the plurality of laser beams 4 are focused on the end face of the fiber 7 by the condenser lens 6 and coupled to the fiber core.
  • the laser housing 100 is composed of a plurality of LD40s and one or more condensing optical elements (collimating lens 2, beam expander 5, condensing lens 6). That is, the laser device 50 includes a plurality of LD40s, one or more condensing optical elements, and an optical transmission unit 30.
  • the optical transmission unit 30 incidents the laser light emitted from the plurality of LD40s from one end and emits the laser light from the other end.
  • one end refers to the left end of the optical transmission unit 30 (the left end of the fiber 7), and the other end is the right end of the optical transmission unit 30. Refers to a portion (the right end of the fiber 13).
  • the fiber 7 has a portion that is one and becomes one end (left end).
  • the plurality of fibers 13 have a portion that is two or more and becomes the other end portion (right end portion).
  • the fiber combiner 8 has a portion opposite to one end of the fiber 7 (the right end of the fiber 7) and a portion opposite the other end of the plurality of fibers 13 (fiber). Connect with the left end of 13).
  • the fiber 7 is connected to the plurality of fibers 10 inside the fiber combiner 8 via the fusion splicer 9.
  • the fiber 7 has a length of, for example, about 30 m.
  • the fiber combiner 8 has a plurality of fibers 10 combined into one end by heating with a burner or the like.
  • the core and clad of the plurality of fibers 10 can be tapered. Flatten the end of the fiber thinned on the taper. In this way, it is possible to fuse this with the right end of the fiber 7.
  • the plurality of fibers 10 may be used as the fiber combiner 8.
  • a part of the laser beam leaks at the fusion part of the fiber combiner 8 due to the fusion loss.
  • the fiber combiner 8 is housed in a metal package. Efficient heat dissipation can be achieved by fixing the metal package to the heat sink.
  • the laser light propagated to the plurality of fibers 10 is emitted as the laser light 11 from the plurality of fibers 10.
  • the laser beam 11 can be emitted in any direction.
  • the cross section of the fiber 7 is as shown in the fiber cross section 7b.
  • the cross section of the plurality of fibers 10 is as shown in the plurality of fiber cross sections 10b. These cross sections will be described later with reference to FIGS. 8A to 8G.
  • the underwater optical wireless communication device 51 includes a laser device 50.
  • the underwater optical wireless communication device 51 is used underwater and transmits a signal by a laser beam to perform communication.
  • the underwater optical wireless communication device 51 is a mobile body that moves underwater.
  • the underwater optical wireless communication device 51 communicates with, for example, an optical communication device fixed in the sea.
  • the underwater optical wireless communication device 51 includes an AUV (Autonomous Underwater Vehicle).
  • the underwater optical wireless communication device 51 when the underwater optical wireless communication device 51 receives the communication light emitted from the optical communication device, optical communication is performed between the optical communication device and the underwater optical wireless communication device 51, and the underwater optical wireless communication device 51 is performed.
  • the optical communication device can perform optical communication between the underwater optical wireless communication device 51 and the optical communication device.
  • Electromagnetic waves have a large amount of attenuation in water and a short propagation distance. Therefore, for wireless communication underwater, sound waves with a long propagation distance are generally used. On the other hand, among electromagnetic waves, visible light has a relatively small amount of attenuation in water. Therefore, by receiving the digitally modulated light emitted from one device by the photodiode or photomultiplier tube built in the other device, wireless communication is performed between the two devices.
  • the end of the fiber 13 is cleaved and smoothed. Then, as shown in FIG. 4B, the emission angles of the fibers 13 are adjusted and arranged.
  • the laser beams 41, 42, and 43 are composed of three fibers 13, and emits laser beams 41, 42, and 43, respectively.
  • the communicable distance is L, and communication is possible within the emission range of the illustrated laser beams 41, 42, and 43.
  • FIG. 5 is a diagram showing an example of a fiber combiner.
  • FIG. 1 an example in which one laser beam is divided into a plurality of laser beams is shown.
  • the present invention is not limited to this, and a plurality of laser beams may be aggregated into one laser beam.
  • the one corresponding to the fiber 7 corresponds to the plurality of fibers 14, and the one corresponding to the plurality of fibers 13 corresponds to the fiber 17.
  • the fiber combiner 8 may be something like the fiber combiner 16.
  • the diameter of the plurality of fibers 10 was configured to be constant.
  • the diameter of the plurality of fibers 15 is configured to become smaller as it approaches the fiber 17.
  • the fibers of the fiber combiner are bundled, melted, stretched, adjusted to an outer diameter or core diameter close to the fiber to be connected, and then fused.
  • FIG. 6 is a diagram showing a state in which a plurality of LD40s are arranged.
  • the LD module 20 in which nine LD40s (LD40a to LD40i) are arranged is configured.
  • the LD 40s are arranged in a tile shape with an interval D of 3 ⁇ 3.
  • LD40a, LD40b, LD40c are arranged from the left in the upper part
  • LD40d, LD40e, LD40f are arranged from the left in the middle part
  • LD40g, LD40h, LD40i are arranged from the left in the lower part.
  • the LD40 inside the laser housing 100 is housed in a ⁇ 9.0 package and is housed in the holder 1a, there is a lower limit to the arrangement interval depending on the dimensions of the holder 1a.
  • the LD40s are arranged in a tile shape having a spacing D1 of 3 ⁇ 3, and the optical axis of the central LD40e and the optical axis of the fiber 7 are aligned with each other.
  • the distances from the central LD40e to the four LD40s (LD40b, d, f, h) adjacent to each other in the vertical and horizontal directions are approximately D1.
  • FIG. 7 is a diagram showing an incident angle and a laser beam intensity.
  • the relationship between the incident angle and the laser beam intensity is as shown in FIG. The distribution is such that the type + center becomes a little stronger.
  • the light intensity in the central portion is increased by the central LD40e, and the donut-shaped light intensity is increased by the eight LD40s around the LD40e.
  • the laser light intensity varies due to the restriction of the arrangement of the plurality of LD40s in the product design. Further, even if there is only one LD40, the intensity distribution will be a mountain-shaped distribution with a strong central intensity, and the laser beam intensity will also vary.
  • the incident NA of the laser beam incident on the fiber has a correlation with the emitted NA. Therefore, the laser beam intensity with respect to the emission angle from the fiber has a far field pattern that reflects the incident NA.
  • the intensity of the laser light emitted from the multiple port sides of the fiber combiner 8 was observed to vary. This is because the modes inside the fiber are not uniform.
  • the cross section of the fiber 7 is as shown in the fiber cross section 7b.
  • the cross section of the plurality of fibers 10 is as shown in the plurality of fiber cross sections 10b.
  • the fiber has a polygonal core cross-sectional structure, and the fiber combiner 8 and the fiber 7 using the fiber having a circular core cross-sectional structure are fused and connected.
  • the fiber combiner 8 is arranged so that the cores of the plurality of fibers 13 are accommodated in the cores of the fiber 7 having a polygonal cross section, and the cores of the fiber 7 and the cores of the plurality of fibers 13 are fused and connected. be. Further, the cross-sectional area of the core of the fiber 7 is larger than the cross-sectional area of any one of the plurality of fibers 13.
  • a specific description will be given.
  • FIG. 8A to 8G are views showing a cross-sectional view of the fiber.
  • the cross section shape of the core 71a is circular.
  • the cross section shape of the core 71b is rectangular.
  • the cross section shape of the core 71c is a hexagon.
  • the plurality of fiber cross sections 10a of the plurality of fibers 10 there are seven cores 101a, and the cross-sectional shape thereof is circular. Further, in the fiber combiner 8, seven cores 101a are arranged so as to fit in the core 71a of the fiber 7. Specifically, when the fusion connection is performed, the seven cores 101a are contained in the circle of the cores 71a. In the present embodiment, the core diameter of the plurality of fibers 10 and the core diameter of the plurality of fibers 13 are the same. When the ones of FIGS.
  • the fiber combiner 8 is arranged so that the cores of the plurality of fibers 13 are contained in the cores 71a of the fiber 7, and the cores 71a of the fiber 7 and the cores of the plurality of fibers 13 are arranged. Will be fused and connected. By doing so, the intensity of the laser beam does not vary at the fused and connected portions.
  • the cross section shape thereof is circular.
  • nine cores 101b are arranged so as to fit in the core 71b of the fiber 7. Specifically, when the fusion connection is performed, the nine cores 101b are contained in the rectangle of the core 71b.
  • the core diameter of the plurality of fibers 10 and the core diameter of the plurality of fibers 13 are the same.
  • the fiber combiner 8 is arranged so that the cores of the plurality of fibers 13 are contained in the cores 71b of the fiber 7, and the cores 71b of the fiber 7 and the cores of the plurality of fibers 13 are arranged. Will be fused and connected. By doing so, the intensity of the laser beam does not vary at the fused and connected portions.
  • the cross section shape of the plurality of fibers 10 is not limited to a circular shape, but may be a polygonal shape.
  • the diameter of the core 71a of the fiber 7 is 400 ⁇ m
  • the diameter of the core 101a of the plurality of fibers 10 is 105 ⁇ m
  • the diameter of the core of the fiber 13 is 105 ⁇ m. That is, the diameter (cross-sectional area) of the core 71a of the fiber 7 is larger than the diameter (cross-sectional area) of the core of the fiber 13.
  • the diameter of the core 71a of the fiber 7 is set to 200 ⁇ m
  • the diameter of the core 101a of the plurality of fibers 10 is changed to 50 to 105 ⁇ m
  • the fiber 13 is used.
  • the diameter of the core can be 105 ⁇ m.
  • the larger the fiber diameter the higher the manufacturing cost of the fiber. Therefore, it is desirable to make the fiber diameter as small as possible.
  • the cross-sectional area of the core 71b of the fiber 7 is larger than the cross-sectional area of the core of the fiber 13.
  • the cross-sectional area of the core 71c of the fiber 7 is larger than the cross-sectional area of the core of the fiber 13.
  • the fiber 7 When the core cross-sectional structure of the fiber 7 is polygonal, the fiber 7 has a mode scramble effect. Therefore, the laser beam emitted from the fiber 7 is more likely to be uniformized as compared with the case where the core cross-sectional structure of the fiber 7 is circular.
  • the optical transmission unit 30 is configured by the combination of FIGS. 8B and 8E. 8A to 8G illustrate that the core cross-sectional structure of the fiber 7 is rectangular or hexagonal, but any fiber having a mode scramble effect may be used.
  • the fiber 7 having a polygonal cross-sectional shape having a mode scramble effect is used, and the fiber combiner 8 is set so that the cores of the plurality of fibers 13 are contained in the core of the fiber 7 having a polygonal cross-sectional shape. Since they are arranged, it is possible to suppress variations in the output of the laser beam emitted from the plurality of fiber sides of the fiber combiner 8. This makes it possible to emit a laser beam having a uniform beam profile in multiple directions, which is useful for a device that emits laser light in multiple directions.
  • a laser light source capable of radiating a laser beam having a uniform power and beam profile in the entire underwater space.
  • the device can efficiently fill the space. As described above, in the present embodiment, it is possible to suppress the variation in the output of the plurality of emitted laser beams for the device that divides and uses one laser beam into a plurality of parts.
  • the laser apparatus 50 according to the second embodiment will be described.
  • the mode inside the fiber 7 is made uniform to further reduce the intensity variation of the laser beam emitted from the plurality of ports of the fiber combiner 8.
  • the laser housing 100 has a plurality of LD40s, and one or more condensing optical elements (collimating lens 2, beam expander 5, and condensing). It was equipped with a lens 6).
  • the laser housing 100 further includes a diffractive optical element 12.
  • Other configurations are the same as those of the first embodiment, and the underwater optical wireless communication device 51 includes the laser device 50 according to the second embodiment.
  • the cross section of the fiber 7 is defined as the fiber cross section 7b, and the cross section of the plurality of fibers 10 is described as the plurality of fiber cross sections 10b. It may be a combination of a fiber cross section 7c and a plurality of fiber cross sections 10c, or may be another combination.
  • FIG. 9 is a diagram showing a laser housing according to the second embodiment.
  • the diffractive optical element 12 is arranged between the beam expander 5 and the condenser lens 6.
  • a two-dimensional transmission type diffractive optical element designed as a homogenizer in which the intensity distribution becomes uniform at the time of laser focusing when the designated condenser lens 6 is used before being incident on the condenser lens 6.
  • An optical element 12 is arranged.
  • the beam profile of the collimated laser light before the condenser lens 6 is, for example, the donut mode (beam intensity distribution 31)
  • the beam profile is shaped into the collimated laser light having a top hat shape (beam intensity distribution 32). can do.
  • Uniform laser light can be fiber-coupled.
  • the beam profile of the laser beam incident on one end of the optical transmission unit 30 is focused in the shape of a top hat.
  • the beam profile is shaped into a top hat shape by the beam homogenizer optical system.
  • the beam profile is shaped into a top hat shape by using the diffractive optical element 12 as described in FIG.
  • the beam homogenizer optical system may be shaped into a top hat shape by using a DOE (Diffractive Optical Elements) beam shaper, or may be shaped into a top hat shape by using a fly-eye lens. It may be shaped into a top hat shape.
  • DOE diffractive Optical Elements
  • the laser beam incident on the fiber 7 is configured to be incident on the fiber combiner 8 from the fiber 7 without going out of the fiber.
  • the fiber 7 is divided into two fibers. Then, the laser light is once emitted from the fiber 7 before being incident on the fiber combiner 8, and the emitted laser light is condensed by the condensing optical element and then incident on the fiber 7 again.
  • Other configurations are the same as those of the first embodiment and the second embodiment.
  • the configuration is such that the middle of the path of the fiber 7 is divided. Then, a condensing optical element is arranged between the divided left fiber 7 and the right fiber 7.
  • the condensing optical element may be composed of a plurality of condensing optical elements (collimating lens 2, beam expander 5, condensing lens 6, etc.), or one condensing optical element. It may be configured.
  • the laser light emitted from the laser housing 100 is incident on the fiber 7. After that, the laser light once emitted from the fiber 7 (left side) is condensed by the condensing optical element and is incident on the fiber 7 (right side) again. After that, the laser beam is incident on the fiber combiner 8 from the fiber 7.
  • the cross-sectional shape of the fiber 7 divided into left and right may be a rectangular shape or a polygon such as the core 71b, or one may be a circular shape such as the core 71a.
  • the fiber 7 is arranged in a straight line or an arbitrary curve.
  • the fiber 7 is configured to be bent a plurality of times in an S shape.
  • Other configurations are the same as those of the first embodiment to the third embodiment.
  • FIG. 10 is a diagram showing a fiber according to a fourth embodiment.
  • the fiber 7 is bent so as to draw a curve of an angle ⁇ with a radius of curvature R, and then, on the opposite side, the fiber 7 is bent so as to draw a curve of an angle ⁇ with a radius of curvature R.
  • the fiber 7 is bent in an S shape. By repeating this, the fiber 7 has a configuration in which the fiber 7 is bent a plurality of times in an S shape.
  • the higher-order mode can be converted into the radiation mode.
  • the laser beam in the radiation mode hits the coating or the like arranged outside the fiber, is absorbed, and generates heat. Therefore, the periphery is covered with a metal housing to absorb the leaked laser beam. Clad mode In order to actively extract light, contacting an object with a refractive index higher than that of the clad with the clad increases the extraction efficiency. Even if the fiber is repeatedly bent in the S order, the extraction efficiency is improved.
  • the underwater optical wireless communication device 51 has been described as an example of the device provided with the laser device 50.
  • the device provided with the laser device 50 is not limited to this.
  • the laser processing device 52 will be illustrated and described as an example of the device including the laser device 50.
  • Other configurations are the same as those of the first to fourth embodiments.
  • the laser processing device 52 includes a laser device 50 and a laser output unit 62.
  • the laser processing apparatus 52 includes a laser apparatus 50 as shown in FIGS. 1 to 3, and is assumed to correspond to the plurality of fibers 13 in FIG. 1 and has 3 on the output side. It is equipped with a book fiber.
  • laser beams 63, 64, and 65 are emitted from each fiber, respectively.
  • the laser processing device 52 simultaneously emits laser light in a plurality of directions to perform laser welding.
  • the output side is not limited to the one provided with three fibers, and a plurality of fibers may be arranged at equal intervals. However, if the number of lines is increased too much, the output per line will decrease, so it is necessary to divide the number so that laser processing can be performed.
  • the fiber 7 having a polygonal cross-sectional shape having a mode scramble effect is used, and the fiber combiner 8 is set so that the cores of the plurality of fibers 13 are contained in the core of the fiber 7 having a polygonal cross-sectional shape. Since they are arranged, it is possible to suppress variations in the output of the laser beam emitted from the plurality of fiber sides of the fiber combiner 8. This makes it possible to emit a laser beam having a uniform beam profile in multiple directions, which is useful for a device that emits laser light in multiple directions. In a laser processing apparatus, for example, it is possible to irradiate a circumference having a uniform beam profile and a laser beam having a laser beam power at intervals of 120 degrees, which is useful for welding cylindrical parts and the like.
  • FIG. 12 is a diagram showing a laser housing according to a modified example.
  • the diffractive optical element 12 is arranged between the beam expander 5 and the condenser lens 6.
  • the present invention is not limited to this, and the diffractive optical element 12 may be arranged between the condenser lens 6 and the fiber 7.
  • the beam profile at the time of focusing can be made uniform (beam intensity distribution 31). Is the beam intensity distribution 32).
  • it can be realized by eliminating the condenser lens 6 and arranging a diffractive optical element designed to collect light when a collimated laser beam is incident.
  • the laser device includes a plurality of laser light sources, an optical transmission unit, and one or more condensing optical elements.
  • the plurality of laser light sources emit laser light.
  • the optical transmission unit receives the laser light emitted from the plurality of laser light sources from one end and emits the laser light from the other end.
  • the one or more condensing optical elements condense the laser light emitted from the plurality of laser light sources and make it incident on one end of the optical transmission unit.
  • the optical transmission unit includes a first fiber, a plurality of second fibers, and a junction.
  • the first fiber has a portion that is one and is one end.
  • the second fiber has two or more portions that are the ends of the other.
  • the junction connects a portion of the first fiber opposite to one end of the first fiber and a portion of the plurality of second fibers opposite to the other end of the fiber.
  • the joints are arranged so that the cores of the plurality of second fibers are contained in the cores of the first fiber having a polygonal cross-sectional shape, and the cores of the first fiber and the cores of the plurality of second fibers are fused. It is connected.
  • the first fiber having a polygonal cross-sectional shape having a mode scramble effect is used, and the joint portion has a plurality of first fibers in the core of the first fiber having a polygonal cross-sectional shape. Since the cores of the two fibers are arranged so as to fit into each other, it is possible to suppress variations in the output of laser light emitted from a plurality of fiber sides of the fiber combiner (joint portion). As a result, the laser beam is made uniform, which is useful for a device that emits the laser beam in multiple directions.
  • a laser light source capable of radiating a laser beam having a uniform power and beam profile in the entire underwater space.
  • the wireless communication device can efficiently fill the space.
  • a laser processing apparatus for example, it is possible to irradiate a circumference having a uniform beam profile and a laser beam having a laser beam power at intervals of 120 degrees, which is useful for welding cylindrical parts and the like.
  • the laser device in a laser device to which a fiber combiner is applied to divide one laser light into a plurality of laser lights and emit the laser light, the laser light emitted from a plurality of fiber sides of the fiber combiner. The variation of the output of is suppressed.
  • the beam profile of the laser light incident on one end of the optical transmission unit is focused in the shape of a top hat.
  • the laser device since the intensity of the laser light incident on one end of the optical transmission unit is made uniform, the output of the laser light emitted from the plurality of fiber sides of the fiber combiner is made uniform. Variation can be suppressed.
  • the beam profile is shaped into a top hat shape by the beam homogenizer optical system.
  • the laser apparatus since the intensity of the laser light incident on one end of the optical transmission unit is made uniform, the output of the laser light emitted from the plurality of fiber sides of the fiber combiner is made uniform. Variation can be suppressed.
  • the beam profile is shaped into a top hat shape by using a diffractive optical element.
  • the laser apparatus since the intensity of the laser light incident on one end of the optical transmission unit is made uniform, the output of the laser light emitted from the plurality of fiber sides of the fiber combiner is made uniform. Variation can be suppressed.
  • laser light is emitted from the first fiber and the emitted laser light is condensed before being incident on the junction.
  • the light is collected by an optical element and then incident again on the first fiber.
  • the analytical laser apparatus since the laser light is collected again by the condensing optical element, it is possible to suppress the variation in the output of the laser light emitted from the plurality of fiber sides of the fiber combiner.
  • the first fiber is bent a plurality of times in an S shape.
  • the analytical laser apparatus since the higher-order mode can be converted into the radiation mode, the variation in the output of the laser light emitted from the plurality of fiber sides of the fiber combiner can be suppressed.
  • the underwater optical wireless communication device includes the laser device according to any one of items 1 to 7.
  • the underwater optical wireless communication device is used underwater and transmits a signal by a laser beam to perform communication.
  • the underwater optical wireless communication device described in item 8 variation in the output of laser light emitted from a plurality of fiber sides of the fiber combiner (joint portion) can be suppressed. As a result, the laser beam is made uniform, which is useful for a device that emits the laser beam in multiple directions.
  • a laser light source capable of radiating a laser beam having a uniform power and beam profile in the entire underwater space is desired. The device can efficiently fill the space.
  • the laser processing apparatus includes the laser apparatus according to any one of paragraphs 1 to 7.
  • the laser processing device simultaneously emits laser light in a plurality of directions to perform laser welding.
  • the laser processing apparatus described in Section 9
  • variations in the output of laser light emitted from a plurality of fiber sides of a fiber combiner (joint portion) can be suppressed.
  • the laser beam is made uniform, which is useful for a device that emits the laser beam in multiple directions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Laser Beam Processing (AREA)

Abstract

La présente invention concerne une fibre (7) qui présente une partie qui devient une extrémité. Au moins deux fibres (13) ont des parties qui deviennent respectivement d'autres extrémités. Un combinateur de fibres (8) relie une partie opposée à la partie de la fibre (7) qui devient une extrémité et des parties opposées aux parties des fibres (13) qui deviennent les autres extrémités respectives. Le combinateur de fibres (8) est conçu de telle sorte que les noyaux des fibres (13) sont disposés en réseau de manière à s'adapter dans un noyau de la fibre (7) ayant une forme de section transversale polygonale, et le cœur de la fibre (7) et les cœurs des fibres (13) sont épissés par fusion.
PCT/JP2021/042518 2021-01-06 2021-11-19 Dispositif laser, dispositif de communication optique sans fil sous-marin et dispositif d'usinage laser WO2022149358A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030215180A1 (en) * 2002-05-17 2003-11-20 Dimas Chris F. Radiation power demultiplexer
US20050265683A1 (en) * 2004-05-28 2005-12-01 Frank Cianciotto High efficiency multi-spectral optical splitter
WO2019150070A1 (fr) * 2018-02-02 2019-08-08 Spi Lasers Uk Limited Appareil et procédé de traitement par laser d'un matériau
WO2019233899A1 (fr) * 2018-06-05 2019-12-12 Imagine Optic Procédés et systèmes pour la génération d'impulsions laser de forte puissance crête
US20200116913A1 (en) * 2017-05-04 2020-04-16 Nkt Photonics A/S Light system for supplying light
JP2022001936A (ja) * 2020-06-22 2022-01-06 三菱電線工業株式会社 光分岐デバイス及びそれを用いた光分岐方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030215180A1 (en) * 2002-05-17 2003-11-20 Dimas Chris F. Radiation power demultiplexer
US20050265683A1 (en) * 2004-05-28 2005-12-01 Frank Cianciotto High efficiency multi-spectral optical splitter
US20200116913A1 (en) * 2017-05-04 2020-04-16 Nkt Photonics A/S Light system for supplying light
WO2019150070A1 (fr) * 2018-02-02 2019-08-08 Spi Lasers Uk Limited Appareil et procédé de traitement par laser d'un matériau
WO2019233899A1 (fr) * 2018-06-05 2019-12-12 Imagine Optic Procédés et systèmes pour la génération d'impulsions laser de forte puissance crête
JP2022001936A (ja) * 2020-06-22 2022-01-06 三菱電線工業株式会社 光分岐デバイス及びそれを用いた光分岐方法

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