WO2020184358A1 - Élément de lentille, élément de guidage de lumière et dispositif laser - Google Patents

Élément de lentille, élément de guidage de lumière et dispositif laser Download PDF

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Publication number
WO2020184358A1
WO2020184358A1 PCT/JP2020/009314 JP2020009314W WO2020184358A1 WO 2020184358 A1 WO2020184358 A1 WO 2020184358A1 JP 2020009314 W JP2020009314 W JP 2020009314W WO 2020184358 A1 WO2020184358 A1 WO 2020184358A1
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WO
WIPO (PCT)
Prior art keywords
lens
light
divergence angle
lens member
bridge
Prior art date
Application number
PCT/JP2020/009314
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English (en)
Japanese (ja)
Inventor
智之 藤田
有也 坂口
研介 島
健太郎 市井
秀徳 宮内
Original Assignee
株式会社フジクラ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社フジクラ filed Critical 株式会社フジクラ
Publication of WO2020184358A1 publication Critical patent/WO2020184358A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • 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
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media

Definitions

  • the present invention relates to a lens member, a light guide member, and a laser device, and particularly relates to a lens member used in a light guide member such as an optical combiner.
  • laser devices that output high-power laser light using a plurality of laser light sources such as fiber lasers have been developed.
  • the laser light output from a plurality of laser light sources is combined by an optical combiner and output from an output optical fiber, but the divergence angle of the light incident on the optical combiner from the plurality of laser light sources is large.
  • light loss may occur without good coupling to the output optical fiber.
  • a GRIN (Gradient Index) lens having a predetermined refractive index distribution may be incorporated on the incident side of the optical combiner to reduce the divergence angle of the laser beam incident on the optical combiner. It is considered (see, for example, Patent Document 1).
  • the consideration for the high-order mode light is not sufficiently examined, and even if the divergence angle of the basic mode light is suppressed to be small, the divergence angle of the high-order mode light becomes large. There is a problem.
  • Such high-order mode light having a large divergence angle may cause light loss in the optical system on the downstream side, and may also cause the tail of the intensity distribution of the propagating light to widen.
  • the present invention has been made in view of such problems of the prior art, and a first object of the present invention is to provide a lens member capable of suppressing the divergence angle of high-order mode light emitted.
  • a second object of the present invention is to provide a light guide member capable of reducing light loss caused by high-order mode light having a large divergence angle.
  • a third object of the present invention is to provide a laser device capable of outputting a laser beam having a good intensity distribution.
  • a lens member capable of suppressing the divergence angle of the emitted higher-order mode light to be small.
  • This lens member includes a lens incident surface on which input light is incident, and a lens emitting surface on the side opposite to the lens incident surface in the optical axis direction.
  • the lens member has a length corresponding to (2n-1) / 4 pitch with respect to the input light, where n is a positive integer.
  • the lens member has a refractive index distribution in which the refractive index gradually decreases from the central portion toward the outer peripheral edge portion in the radial direction.
  • the refractive index difference ⁇ between the central portion and the peripheral portion is an optical path from the central portion of the incident surface of the lens to the peripheral edge of the lens with respect to the light of the basic mode incident on the incident surface of the lens. larger than the refractive index difference delta 01 to realize.
  • a light guide member capable of reducing light loss caused by higher-order mode light having a large divergence angle.
  • the light guide member includes at least one lens member made of the above-mentioned lens member, at least one input optical fiber connected to the lens incident surface of the at least one lens member, and a bridge fiber.
  • the bridge fiber includes a bridge incident surface connected to the lens emitting surface of at least one lens member, a reduced diameter portion whose diameter gradually decreases as the distance from the bridge incident surface along the optical axis direction increases, and the above. It has a bridge exit surface on the opposite side of the bridge entrance surface in the optical axis direction.
  • the light guide member further includes an output optical fiber connected to the bridge exit surface of the bridge fiber.
  • a laser apparatus capable of outputting a laser beam having a good intensity distribution.
  • This laser device includes at least one laser light source that generates a laser beam and the light guide member described above.
  • the laser light from the at least one laser light source is input to the at least one input optical fiber of the light guide member.
  • a laser apparatus capable of outputting a laser beam having a good intensity distribution.
  • This laser device includes a laser light source that generates laser light, the lens member described above, and an output optical fiber connected to the lens emitting surface of the lens member. The laser beam from the laser light source is input to the lens incident surface of the lens member.
  • FIG. 1 is a schematic block diagram showing a configuration of a laser device according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing an optical combiner in the laser device of FIG.
  • FIG. 3 is a schematic view showing one of the lens members in FIG. 2 together with the refractive index distribution.
  • FIG. 4 is a schematic diagram illustrating an optical path of basic mode light and higher-order mode light when the lens member in FIG. 2 is designed by a conventional GRIN lens design method.
  • FIG. 5 is a schematic diagram illustrating an optical path of basic mode light and higher-order mode light in the lens member in FIG. 2.
  • Figure 6A is a graph showing the relationship between the cumulative power of the light emitted from the lens exit surface and the divergence angle in the case the refractive index difference between the central portion and the peripheral portion of the lens member delta was the case with delta 11 which was delta 01 Is.
  • FIG. 6B is an enlarged graph showing a part of FIG. 6A.
  • Figure 7A shows the relationship between the divergence angle and the cumulative power of the light emitted from the bridge exit surface of the bridge fiber when the refractive index difference between the central portion and the peripheral portion of the lens member delta was the case with delta 11 which was delta 01 It is a graph which shows.
  • FIG. 7B is an enlarged graph showing a part of FIG. 7A.
  • FIGS. 1 to 7B the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted. Further, in FIGS. 1 to 7B, the scale and dimensions of each component may be exaggerated or some components may be omitted.
  • FIG. 1 is a schematic block diagram showing a configuration of a laser device 1 according to an embodiment of the present invention.
  • the laser apparatus 1 in the present embodiment includes a plurality of laser light sources 2 that generate laser light, and an optical combiner 3 as a light guide member to which laser light from each laser light source 2 is input.
  • a laser emitting portion 4 provided at an end portion on the downstream side of the optical combiner 3 is provided.
  • the respective laser light sources 2 and the optical combiner 3 are connected to each other by an optical fiber 5, and the optical combiner 3 and the laser emitting unit 4 are connected to each other by an optical fiber 6.
  • the laser light source 2 for example, a fiber laser or a semiconductor laser can be used.
  • each laser light source 2 propagates through the optical fiber 5 and is introduced into the optical combiner 3.
  • laser light from a plurality of laser light sources 2 is combined and output to the optical fiber 6.
  • the high-power laser light output to the optical fiber 6 is emitted from the laser emitting unit 4 toward, for example, a work piece.
  • FIG. 2 is a perspective view showing the optical combiner 3.
  • the components of the optical combiner 3 are shown separated from each other along the optical axis direction for ease of understanding, but in reality, these components are fused and connected to each other. ing.
  • the optical combiner 3 in the present embodiment is for reducing the divergence angle of the input optical fiber 50 constituting at least a part of the above-mentioned optical fiber 5 and the light emitted from the input optical fiber 50.
  • the lens member 10 is included, a bridge fiber 20 arranged on the downstream side of the lens member 10, and an output optical fiber 60 forming at least a part of the above-mentioned optical fiber 6.
  • the input optical fibers 50 are arranged so that six input optical fibers 50 surround the central input optical fiber 50.
  • Each input optical fiber 50 has a core 52 and a clad 54 that covers the periphery of the core 52.
  • the refractive index of the clad 54 is lower than that of the core 52, and an optical waveguide in which the laser light from the laser light source 2 propagates is formed inside the core 52.
  • the outer diameter of the core 52 of the input optical fiber 50 is 28 ⁇ m
  • the outer diameter of the clad 54 is 125 ⁇ m
  • the difference in refractive index between the core 52 of the input optical fiber 50 and the clad 54 is 0.12%.
  • FIG. 3 is a schematic view showing one of the lens members 10 together with the refractive index distribution.
  • Each lens member 10 is a columnar member, and as shown in FIG. 3, the lens incident surface 12 connected to the input optical fiber 50 and the side opposite to the lens incident surface 12 in the direction of the optical axis P. It has a lens emitting surface 14.
  • This lens member 10 is a so-called GRIN lens, and as shown in FIG. 3, has a refractive index distribution in which the refractive index gradually decreases from the central portion 16 toward the peripheral edge portion 18 on the outer side in the radial direction. ..
  • a lens member 10 can be formed, for example, by adding a dopant such as germanium (Ge) to the central portion 16 of a cylindrical glass made of quartz at a high concentration.
  • the diameter of the lens member 10 is larger than that of the core 52 of the input optical fiber 50.
  • the diameter of the lens member 10 is the same as the outer diameter of the clad 54 of the input optical fiber 50 (for example, 125 ⁇ m), which is the same as the effective diameter E of the lens member 10.
  • the peripheral edge portion 18 of the lens member 10 refers to a portion of the lens member 10 at a distance of half the effective diameter from the optical axis P.
  • the core 52 of the input optical fiber 50 is fused and connected to the lens incident surface 12 of the lens member 10, whereby the light propagating through the core 52 of the input optical fiber 50 is incident on the lens member 10 and the lens member 10 Is propagated and emitted from the lens exit surface 14.
  • the length L (distance from the lens incident surface 12 to the lens emitting surface 14) along the direction of the optical axis P of the lens member 10 is incident on the lens member 10 from the input optical fiber 50, where n is a positive integer. It has a length corresponding to (2n-1) / 4 pitch with respect to light. As a result, the light incident from the lens incident surface 12 of the lens member 10 is refracted by the above-mentioned refractive index distribution, and is emitted from the lens emitting surface 14 of the lens member 10 in a state where the divergence angle is reduced.
  • n 1, and the length L of the lens member 10 is a length corresponding to 1/4 pitch with respect to the light incident on the lens member 10.
  • the bridge fiber 20 includes a cylindrical portion 21 having a constant outer diameter along the optical axis and a reduced diameter portion 23 whose outer diameter gradually decreases along the optical axis.
  • the end surface of the cylindrical portion 21 is a bridge incident surface 22 to which each lens member 10 is connected, and the end surface of the reduced diameter portion 23 located on the opposite side of the bridge incident surface 22 in the optical axis direction is the bridge exit surface. It is 24.
  • the bridge fiber 20 in this embodiment does not have a core-clad structure inside, and the entire bridge fiber 20 is an optical waveguide.
  • the lens exit surface 14 of each lens member 10 is fused and connected to the bridge entrance surface 22 of the bridge fiber 20.
  • the light emitted from the lens emitting surface 14 of the lens member 10 enters the bridge fiber 20 from the bridge incident surface 22 and reflects inside the bridge fiber 20 while being reflected by the outer peripheral surfaces of the cylindrical portion 21 and the reduced diameter portion 23. It propagates and is emitted from the bridge exit surface 24.
  • the refractive index of the bridge fiber 20 is preferably substantially the same as the refractive index of the central portion 16 of the lens member 10.
  • the output optical fiber 60 has a core 62, a clad 64 that covers the periphery of the core 62, and a coating 66 that covers the periphery of the clad 64.
  • the outer diameter of the core 62 of the output optical fiber 60 is equal to or larger than the outer diameter of the bridge exit surface 24 of the bridge fiber 20.
  • the bridge exit surface 24 of the bridge fiber 20 is fusion-bonded to the core 62 of the output optical fiber 60. As a result, the light emitted from the bridge exit surface 24 of the bridge fiber 20 is incident on the core 62 of the output optical fiber 60.
  • the refractive index of the clad 64 of the output optical fiber 60 is lower than the refractive index of the core 62, and an optical waveguide in which the light emitted from the bridge fiber 20 propagates is formed inside the core 62.
  • the refractive index of the core 62 of the output optical fiber 60 is preferably substantially the same as the refractive index of the bridge fiber 20. .. Further, the coating 66 of the output optical fiber 60 is removed in the vicinity of the fusion splicer with the bridge fiber 20.
  • the light incident on the input optical fiber 50 is the light of a mode higher than the basic mode (LP11, LP02) in addition to the light of the basic mode (LP01). Is also included.
  • light having a beam quality factor M 2 value greater than 1.0 according to the international standard ISO11146 is incident on the input optical fiber 50.
  • the lens member 10 according to the present embodiment is particularly effective for light having an M 2 value greater than 1.1.
  • the lens member 10 When the lens member 10 is manufactured by such a conventional design, when the light of the higher order mode of LP11 or higher is included (that is, M 2 is larger than 1.0), the lens member 10 is as shown in FIG.
  • the basic mode light LP01 incident on the central portion 16 of the lens incident surface 12 of 10 is refracted while propagating through the lens member 10, and reaches the peripheral edge portion 18 on the lens emitting surface 14.
  • the basic mode light LP01 becomes collimated light on the lens emitting surface 14.
  • light higher than the basic mode light LP01 for example, the higher mode light LP11 reaches the peripheral edge portion 18 before reaching the lens emitting surface 14, as shown in FIG. Since such high-order mode light LP 11 is reflected by the peripheral edge portion 18 of the lens member 10, the divergence angle becomes large when the light is emitted from the lens emitting surface 14.
  • the higher-order mode light is incident on the bridge fiber 20 at such a large divergence angle, it may not be able to be coupled to the core 62 of the output optical fiber 60, resulting in light loss. Further, even if such high-order mode light can be coupled to the core 62 of the output optical fiber 60, the skirt of the intensity distribution of the laser light finally emitted from the laser emitting portion 4 is affected by the high-order mode light. Will spread by.
  • the laser beam having an intensity distribution having a wide hem as described above tends to cause a loss in the laser emitting portion 4, causing damage to the laser emitting portion 4 or making proper processing by the laser beam difficult.
  • the divergence angle at the lens exit surface 14 of the high-order mode light in FIG. 4 It is smaller than the case shown.
  • the refractive index difference between the central portion 16 and the peripheral portion 18 of the lens member 10 delta was delta 11, as shown in FIG. 5, the high-order incident on the central portion 16 of the lens entrance surface 12 of the lens member 10
  • the mode light LP 11 is refracted while propagating through the lens member 10 and reaches the peripheral edge portion 18 on the lens emitting surface 14.
  • the higher-order mode light LP 11 becomes collimated light on the lens emitting surface 14. Therefore, the divergence angle of the higher-order mode light LP11 emitted from the lens emitting surface 14 of the lens member 10 can be suppressed to a small value.
  • the high-order mode light can be easily coupled to the core 62 of the output optical fiber 60, and the laser emission portion.
  • the spread of the hem in the intensity distribution of the laser beam emitted from No. 4 is suppressed.
  • the basic mode optical LP01 is in a slightly focused state on the lens emitting surface 14 of the lens member 10, and the coupling efficiency of the output optical fiber 60 with respect to the core 62 is lowered.
  • the maximum divergence angle is suppressed to be small, so that the light is emitted from the laser emitting unit 4.
  • the condition of the laser beam is improved.
  • the divergence angle of the optical power is 96% with a divergence angle of less that divergence angle of the total power of the light emitted from the lens exit surface 14, the difference in refractive index delta 01 It can be seen that it is about 0.03 in the case of the lens member 10 having the refractive index difference ⁇ 11 and about 0.015 in the case of the lens member 10 having the refractive index difference ⁇ 11 . That is, these graphs, the refractive index difference delta between the central portion 16 and the peripheral portion 18 of the lens member 10 is made larger than the delta 01, the divergence angle of the light emitted from the lens exit surface 14 (the fundamental mode light It shows that it can be kept small as a whole (including high-order mode light).
  • the maximum divergence angle of the lens is defined as the divergence angle at which 99% of the total power of the light emitted from the lens exit surface 14 of the lens member 10 has a divergence angle equal to or less than the divergence angle.
  • the refractive index difference ⁇ is set so that the maximum divergence angle of the lens is smaller than when the refractive index difference is ⁇ 01. It is preferable to select.
  • lenses maximum divergence angle of about 0.05 of the lens member 10 with a refractive index difference delta 01, lens maximum divergence angle of the lens member 10 with a refractive index difference delta 11 has become approximately 0.03 ,
  • the maximum lens divergence angle when the refractive index difference ⁇ is ⁇ 11 is smaller than the maximum lens divergence angle when the refractive index difference ⁇ is ⁇ 01 .
  • the lens member 10 having the refractive index difference ⁇ 01 is used, and about 0.075 when the lens member 10 having the refractive index difference ⁇ 11 is used. That is, in these graphs, the refractive index difference ⁇ between the central portion 16 and the peripheral portion 18 of the lens member 10 is made larger than ⁇ 01 , so that the divergence angle of the light emitted from the bridge emitting surface 24 of the bridge fiber 20 is increased. It shows that it can be kept small as a whole (including basic mode light and higher mode light).
  • the divergence angle at which 99% of the total power of the light emitted from the bridge exit surface 24 of the bridge fiber 20 has a divergence angle equal to or less than the divergence angle is defined as the maximum divergence angle of the bridge fiber. Similar to the maximum lens divergence angle described above, reducing the maximum divergence angle of the bridge fiber is very important in processing using a high-power laser beam. Therefore, when determining the refractive index difference ⁇ between the central portion 16 and the peripheral portion 18 of the lens member 10, the refractive index difference ⁇ is such that the maximum divergence angle of the bridge fiber is smaller than when the refractive index difference is ⁇ 01. It is preferable to select.
  • the bridge fiber maximum divergence angle in the case of using a lens member 10 having a refractive index difference delta 01 is about 0.175
  • the bridge fiber maximum divergence in the case of using a lens member 10 having a refractive index difference delta 11 The angle is about 0.1
  • the maximum divergence angle of the bridge fiber when the refractive index difference ⁇ is ⁇ 11 is smaller than the maximum divergence angle of the bridge fiber when the refractive index difference ⁇ is ⁇ 01.
  • the optical combiner 3 including a plurality of lens members 10 has been described as an example of the light guide member according to the present invention, but the present invention has a light guide member including only one lens member 10 described above. Needless to say, it can also be applied to.
  • the laser device 1 in the above-described embodiment includes the optical combiner 3, a configuration of a laser device that does not include the optical combiner 3 is also conceivable.
  • the laser light from the laser light source 2 is configured to be incident on the lens incident surface 12 of the lens member 10, and the output optical fiber forming at least a part of the optical fiber 6 is connected to the lens emitting surface 14 of the lens member 10. You may.
  • a lens member capable of suppressing the divergence angle of the emitted higher-order mode light to be small.
  • This lens member includes a lens incident surface on which input light is incident, and a lens emitting surface on the side opposite to the lens incident surface in the optical axis direction.
  • the lens member has a length corresponding to (2n-1) / 4 pitch with respect to the input light, where n is a positive integer.
  • the lens member has a refractive index distribution in which the refractive index gradually decreases from the central portion toward the outer peripheral edge portion in the radial direction.
  • the refractive index difference ⁇ between the central portion and the peripheral portion is an optical path from the central portion of the incident surface of the lens to the peripheral edge of the lens with respect to the light of the basic mode incident on the incident surface of the lens. larger than the refractive index difference delta 01 to realize.
  • n 1.
  • the lens member having such a configuration can suppress the divergence angle when the higher-order mode light is emitted from the lens emitting surface to a small size.
  • the input light is preferably light having a beam quality factor M 2 value larger than 1.1 according to the international standard ISO11146.
  • Such input light includes higher-order mode light in addition to basic mode light.
  • the maximum divergence angle of the lens is defined. corner, smaller than the lens the maximum divergence angle when the refractive index difference between the central portion and the peripheral portion is delta 01 is preferred.
  • a light guide member capable of reducing light loss caused by higher-order mode light having a large divergence angle.
  • the light guide member includes at least one lens member made of the above-mentioned lens member, at least one input optical fiber connected to the lens incident surface of the at least one lens member, and a bridge fiber.
  • the bridge fiber includes a bridge incident surface connected to the lens emitting surface of at least one lens member, a reduced diameter portion whose diameter gradually decreases as the distance from the bridge incident surface along the optical axis direction increases, and the above. It has a bridge exit surface on the opposite side of the bridge entrance surface in the optical axis direction.
  • the light guide member further includes an output optical fiber connected to the bridge exit surface of the bridge fiber.
  • the divergence angle of the higher-order mode light emitted from the lens exit surface of the lens member can be suppressed to be small, so that the higher-order mode light having a large divergence angle in the optical system downstream of the light guide member can be used.
  • the resulting light loss can be reduced.
  • the divergence angle at which 99% of the total power of the light emitted from the bridge exit surface of the bridge fiber has a divergence angle equal to or less than the divergence angle is defined as the maximum divergence angle of the bridge fiber.
  • bridge fiber maximum divergence angle of the light guide member is smaller than the bridge fiber maximum divergence angle when the refractive index difference between the central portion and the peripheral portion of the lens member is delta 01 is preferred.
  • a laser apparatus capable of outputting a laser beam having a good intensity distribution.
  • This laser device includes at least one laser light source that generates a laser beam and the light guide member described above.
  • the laser light from the at least one laser light source is input to the at least one input optical fiber of the light guide member.
  • the divergence angle of the higher-order mode light output from the light guide member can be suppressed to be small, so that the intensity distribution of the laser light output from the laser device can be improved.
  • a laser apparatus capable of outputting a laser beam having a good intensity distribution.
  • This laser device includes a laser light source that generates laser light, the lens member described above, and an output optical fiber connected to the lens emitting surface of the lens member. The laser beam from the laser light source is input to the lens incident surface of the lens member.
  • the divergence angle of the high-order mode light output from the lens member can be suppressed to be small, so that the intensity distribution of the laser light output from the laser device can be made good.
  • the divergence angle of the higher-order mode light emitted from the lens exit surface of the lens member can be suppressed to be small, so that the higher-order mode light having a large divergence angle in the optical system downstream of the light guide member can be suppressed.
  • the light loss caused by this can be reduced.
  • the present invention is suitably used for a lens member used in a light guide member such as an optical combiner.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un élément de lentille capable de diminuer l'angle de divergence de la lumière en mode supérieur émise. L'élément de lentille (10) est pourvu d'une surface d'incidence de lentille (12) sur laquelle une lumière d'entrée est incidente et d'une surface d'émission de lentille (14) opposée à la surface d'incidence de lentille (12) le long d'un axe optique P. L'élément de lentille (10) a une longueur équivalente à un quart de pas de la lumière d'entrée. L'élément de lentille (10) a une distribution d'indice de réfraction telle que l'indice de réfraction diminue progressivement depuis une partie centrale (16) radialement vers l'extérieur en direction d'un rebord (18). La différence d'indice de réfraction Δ entre la partie centrale (16) et le rebord (18) est supérieure à la différence d'indice de réfraction Δ01 qui crée un trajet optique à partir de la partie centrale (16) de la surface d'incidence de lentille (12) jusqu'au rebord (18) au niveau de la surface d'émission de lentille (14) par rapport à la lumière d'un mode de base LP01 incident sur la surface d'incidence de lentille (12).
PCT/JP2020/009314 2019-03-13 2020-03-05 Élément de lentille, élément de guidage de lumière et dispositif laser WO2020184358A1 (fr)

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JP2019-045518 2019-03-13
JP2019045518A JP2020148875A (ja) 2019-03-13 2019-03-13 レンズ部材、導光部材、及びレーザ装置

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003598A2 (fr) * 2002-06-27 2004-01-08 Brown University Research Foundation Procede et appareil de detection de longueurs d'ondes optiques multiples
JP2007286253A (ja) * 2006-04-14 2007-11-01 Scalar Corp 樹脂製光学製品、及びロッドレンズの製造方法
JP2013190714A (ja) * 2012-03-15 2013-09-26 Fujikura Ltd 光ファイバコンバイナ、及び、それを用いたレーザ装置
JP2015022133A (ja) * 2013-07-18 2015-02-02 株式会社フジクラ 光ファイバコンバイナの製造方法、光ファイバコンバイナ、及び、レーザ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003598A2 (fr) * 2002-06-27 2004-01-08 Brown University Research Foundation Procede et appareil de detection de longueurs d'ondes optiques multiples
JP2007286253A (ja) * 2006-04-14 2007-11-01 Scalar Corp 樹脂製光学製品、及びロッドレンズの製造方法
JP2013190714A (ja) * 2012-03-15 2013-09-26 Fujikura Ltd 光ファイバコンバイナ、及び、それを用いたレーザ装置
JP2015022133A (ja) * 2013-07-18 2015-02-02 株式会社フジクラ 光ファイバコンバイナの製造方法、光ファイバコンバイナ、及び、レーザ装置

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