Optical devices, light source devices, and fiber lasers

Abstract

An optical device may include, for example, a base (21a); ​​a light-emitting element (32) disposed on the base (21a) and emitting laser light; a plurality of optical components disposed on the base (21a) and guiding the laser light emitted from the light-emitting element (32) to an optical fiber (107) and coupling it to the optical fiber (107); and a shielding portion (101d1) disposed on the base (21a) and shielding stray light that deviates from a predetermined optical path and is directed toward a second optical component, which is also an optical component, within a first optical component, and reflecting the stray light in a direction deviating from the first optical component. In the optical device, the shielding portion (101d1) may also reflect stray light away from the base (21a).

Description

Technical Field

[0001] This invention relates to optical devices, light source devices, and fiber lasers. Background Technology

[0002] Previously, there were known optical devices that had a processing unit for processing stray light (leakage light) that deviated from a predetermined optical path (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2017 / 134911 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] As with the optical device in Patent Document 1, it is important to suppress the negative effects of stray light in such an optical device.

[0008] Therefore, one of the objectives of this invention is to obtain optical devices, light source devices, and fiber lasers with new structures that have further improved capabilities, capable of suppressing the negative effects of stray light.

[0009] Solution for solving the problem

[0010] The optical device of the present invention includes, for example: a base; a light-emitting element disposed on the base and emitting laser light; a plurality of optical components disposed on the base and guiding the laser light emitted from the light-emitting element to an optical fiber and coupling thereto; and a shielding portion disposed on the base and shielding stray light deviating from a predetermined optical path and toward a second optical component that is also an optical component in a first optical component, and reflecting the stray light in a direction deviating from the first optical component.

[0011] In the optical device, the shielding part may also reflect the stray light away from the base.

[0012] In the optical device, the shielding part may also reflect and absorb the stray light.

[0013] In the optical device, the first optical component may be fixed to the base via a bonding material, and the shielding portion may block stray light toward the bonding material.

[0014] In the optical device, the first optical component may also be fixed to a protrusion protruding from the surface of the base via the bonding material.

[0015] Alternatively, the optical device may include: a first subunit comprising at least one of the optical components that transmit laser light in a first direction; and a second subunit comprising at least one of the optical components that transmit laser light in the opposite direction to the first direction, wherein the shielding portion blocks and reflects at least one of the stray light traveling from the first subunit in the first direction and the stray light traveling from the second subunit in the opposite direction to the first direction.

[0016] In the optical device, the shielding part may also block stray light traveling from the first subunit toward the first direction and stray light traveling from the second subunit toward the opposite direction to the first direction, and reflect them.

[0017] In the optical device, the shielding portion may also be located between the first sub-unit and the second sub-unit.

[0018] Alternatively, the optical device may include: a plurality of first sub-units, each including at least one of the optical components that transmits laser light in a first direction; a plurality of shielding portions, which are disposed corresponding to each of the first sub-units and serve as shielding portions that block stray light traveling in the first direction and reflect the stray light in a second direction; and an absorption portion that receives and absorbs the stray light reflected by the plurality of shielding portions.

[0019] Alternatively, the optical device may include: a plurality of first sub-units, each comprising at least one of the optical components that transmits laser light in a first direction; a plurality of first shielding portions, each disposed corresponding to each of the first sub-units, serving as shielding portions that block stray light traveling in the first direction and reflect the stray light in a second direction; a plurality of second sub-units, each comprising at least one of the optical components that transmits laser light in the opposite direction to the first direction; a plurality of second shielding portions, each disposed corresponding to each of the second sub-units, serving as shielding portions that block stray light traveling in the opposite direction to the first direction and reflect the stray light in the second direction; and an absorption portion that receives and absorbs the stray light from the plurality of first shielding portions and the plurality of second shielding portions.

[0020] In the optical device, the shielding part may have a reflective surface that reflects the stray light toward the third direction in the opposite direction to the third direction and in the fourth direction orthogonal to the third direction. In the structure of the optical component having an end point, the end point is separated from the reflective surface in the opposite direction to the third direction, protrudes from the surface of the base toward the fourth direction, and is the end point of the fourth direction in the end face of the third direction. When the distance in the third direction of the position of the end point and the optical axis of the stray light in the reflective surface, i.e., the reflection point, is set as Xd, the distance in the fourth direction of the optical axis and the end point is set as Zd, the incident angle of the stray light relative to the reflective surface is set as α, and the beam width of the stray light is set as Wb, the following formula is satisfied: (1) Xd·tan(2α)-0.5·Wb / cos(2α)>Zd···(1).

[0021] In the optical device, a cooling passage for refrigerant may be provided on the base, and the shielding part may be thermally connected to the refrigerant via the base.

[0022] In addition, the optical device of the present invention includes, for example, a plurality of optical components that guide laser light to and couple it to an optical fiber; and a shielding portion that blocks stray light deviating from a predetermined optical path in the optical components and reflects the stray light in a direction deviating from the optical components.

[0023] Alternatively, the optical device may have a base having a surface on which the plurality of optical components are disposed, the shielding portion protruding from the surface and reflecting the stray light away from the surface.

[0024] Alternatively, the optical component may include an optical element that reflects a first laser beam traveling in a sixth direction toward a seventh direction and allows a second laser beam traveling in the seventh direction to pass through. Stray light from the optical element includes at least one of the stray light of the first laser beam that is not reflected by the optical element and travels from the optical element toward the sixth direction, and the stray light of the second laser beam that is not transmitted through the optical element and travels from the optical element toward the sixth direction. The shielding portion is located at a position separated from the optical element in the sixth direction.

[0025] In addition, the light source device of the present invention includes, for example, the optical device described above.

[0026] In addition, the fiber laser of the present invention includes, for example, the light source device and an optical amplifying fiber that amplifies the laser emitted from the light source device.

[0027] Invention Effects

[0028] According to the present invention, for example, it is possible to obtain optical devices, light source devices, and fiber lasers with further improved structures that can suppress the negative effects of stray light. Attached Figure Description

[0029] Figure 1 This is an exemplary and schematic top view of the optical device according to the first embodiment.

[0030] Figure 2 This is an exemplary and schematic perspective view of the base included in the optical device of the first embodiment.

[0031] Figure 3 This is an illustrative and schematic side view of the sub-units included in the optical device of the first embodiment.

[0032] Figure 4 This is an illustrative and schematic side view (partial cross-sectional view) of the optical device of the first embodiment, including a portion of the shielding part.

[0033] Figure 5 This is an illustrative and schematic side view of the optical device according to the first embodiment, including a shielding portion and a portion of the optical components.

[0034] Figure 6 This is an illustrative and schematic top view of a part of the optical device of the second embodiment.

[0035] Figure 7 This is an illustrative and schematic side view of the shielding portion included in the optical device of the second embodiment.

[0036] Figure 8 This is an illustrative and schematic top view of the optical device according to the third embodiment.

[0037] Figure 9 yes Figure 8 A magnified view of a portion of it.

[0038] Figure 10 This is an illustrative and schematic top view of the optical device according to the fourth embodiment.

[0039] Figure 11 This is an illustrative and schematic top view of the optical device according to the fifth embodiment.

[0040] Figure 12 This is an illustrative and schematic top view of the optical device according to the sixth embodiment.

[0041] Figure 13 This is an exemplary structural diagram of the light source device according to the seventh embodiment.

[0042] Figure 14 This is an exemplary structural diagram of the fiber laser according to the eighth embodiment.

[0043] Figure 15 This is an exemplary and schematic side view of the shielding portion included in the optical device of a modified embodiment. Detailed Implementation

[0044] Hereinafter, exemplary embodiments and modifications of the present invention are disclosed. The structures of the embodiments and modifications shown below, as well as the effects and results (effects) brought about by these structures, are examples. The present invention can also be implemented with structures other than those disclosed in the embodiments and modifications below. Furthermore, according to the present invention, at least one of various effects (including derived effects) obtained through the structure can be obtained.

[0045] The various embodiments and modifications shown below have the same structure. Therefore, based on the structure of each embodiment and modification, the same function and effect based on the same structure can be obtained. In addition, the same reference numerals are sometimes used to refer to these same structures below, and repeated descriptions are omitted.

[0046] In this manual, the ordinal numbers are used to distinguish parts, locations, directions, etc., and do not indicate priority or order.

[0047] In addition, in each diagram, arrow X1 represents the X1 direction, arrow X2 represents the X2 direction, arrow Y represents the Y direction, and arrow Z represents the Z direction. The X1, Y, and Z directions intersect each other and are orthogonal. Furthermore, the X1 and X2 directions are opposite to each other.

[0048] It should be noted that, in Figure 1 , 3 In 8, 10 to 12, the optical path of laser L is represented by a solid arrow.

[0049] [First Implementation Method]

[0050] Figure 1 This is a schematic structural diagram of the optical device 100A (100) of the first embodiment, and a top view of the interior of the optical device 100A viewed in the opposite direction of the Z direction.

[0051] like Figure 1As shown, the optical device 100A includes a base 101, multiple sub-units 100a, a light combining unit 108, condensing lenses 104 and 105, and an optical fiber 107. Laser light output from the light-emitting module 10A of each sub-unit 100a is transmitted via the reflector 103, light combining unit 108, and condensing lenses 104 and 105 of each sub-unit 100a to the end (not shown) of the optical fiber 107, and is optically coupled to the optical fiber 107. The optical device 100A can also be referred to as a light-emitting device.

[0052] The base 101 is made of a material with high thermal conductivity, such as copper-based or aluminum-based materials. The base 101 can be composed of a single component or multiple components. Furthermore, the base 101 is covered by a cover (not shown). Multiple sub-units 100a, multiple reflectors 103, a light combining unit 108, focusing lenses 104 and 105, and the end of the optical fiber 107 are all disposed on the base 101 and housed within a housing chamber (not shown) formed between the base 101 and the cover. The housing chamber is hermetically sealed.

[0053] The optical fiber 107 is an output optical fiber and is fixed to the base 101 via an optical fiber support 106a that supports its end.

[0054] The fiber support 106a can be integrally formed with the base 101 as part of the base 101, or the fiber support 106a, which is a separate component from the base 101, can be installed on the base 101, for example, by means of a fastener such as a screw.

[0055] Subunit 100a includes a laser-emitting module 10A, multiple lenses 41A to 43A, and a reflector 103. Lenses 41A to 43A and reflector 103 are examples of optical components. Lenses 42A and 43A collimate the laser along the fast and slow axes.

[0056] Furthermore, the optical device 100A includes two arrays A1 and A2, in which multiple sub-units 100a are arranged at predetermined intervals in the Y direction. In sub-unit 100a1 (100a) of array A1, the light-emitting module 10A outputs laser light in the X1 direction, lenses 41A to 43A transmit the laser light from the light-emitting module 10A in the X1 direction, and mirror 103 reflects the laser light traveling in the X1 direction in the Y direction. In sub-unit 100a2 (100a) of array A2, the light-emitting module 10A outputs laser light in the X2 direction, lenses 41A to 43A transmit the laser light from the light-emitting module 10A in the X2 direction, and mirror 103 reflects the laser light traveling in the X2 direction in the Y direction. Sub-unit 100a1 is an example of a first sub-unit, and sub-unit 100a2 is an example of a second sub-unit. In addition, the X1 direction is an example of a first direction, and the X2 direction is an example of the opposite direction of the first direction.

[0057] In this embodiment, sub-units 100a1 of array A1 and sub-units 100a2 of array A2 are arranged in the X1 direction (X2 direction). When sub-units 100a1 and 100a2 are arranged along the X1 direction, it is advantageous, for example, that the size of the optical device 100A in the Y direction becomes smaller. However, this is not a limitation; sub-units 100a1 and 100a2 can also be staggered. For example, each sub-unit 100a2 can also be arranged in the X1 direction relative to the gap between two adjacent sub-units 100a1 in the Y direction.

[0058] Figure 2 This is a three-dimensional view of base 101. (See diagram below.) Figure 2 As shown, a plurality of steps 101b1 are provided on the surface 101b of the base 101, with the positions of the sub-units 100a offset in the opposite direction to the Z direction as they are oriented toward the Y direction. For each of the arrays A1 and A2 in which the plurality of sub-units 100a are arranged at predetermined intervals (e.g., a certain interval) in the Y direction, the sub-units 100a are disposed on each step 101b1. Thus, the Z-direction positions of the sub-units 100a included in array A1 are offset in the opposite direction to the Z direction as they are oriented toward the Y direction, and the Z-direction positions of the sub-units 100a included in array A2 are also offset in the opposite direction to the Z direction as they are oriented toward the Y direction. With such a structure, in each array A1 and A2, mutually parallel laser beams arranged in the Z direction and traveling in the Y direction can be input to the light combining unit 108 from the plurality of reflectors 103. It should be noted that the step 101b1 can also be configured such that the step is offset relative to the Z direction in a direction inclined toward the Y direction or the opposite direction of the Y direction, and the laser travels from each reflector 103 in a direction with a specified elevation angle relative to the Y direction.

[0059] like Figure 1 As shown, lasers from each of the reflectors 103 are input into the light combining unit 108 and combined therein.

[0060] The light combining unit 108 includes a combiner 108a, a reflector 108b, and a half-wave plate 108c. The combiner 108a, the reflector 108b, and the half-wave plate 108c are examples of optical components.

[0061] The reflector 108b directs the laser light from the sub-unit 100a of array A1 toward the synthesizer 108a via the half-wave plate 108c. The half-wave plate 108c rotates the polarization plane of the light from array A1.

[0062] The laser from sub-unit 100a of array A2 is directly input into synthesizer 108a.

[0063] Combiner 108a combines laser light from two arrays A1 and A2. Combiner 108a can also be called a polarization combining element.

[0064] The laser light from the synthesizer 108a is focused toward the end (not shown) of the optical fiber 107 by the focusing lenses 104 and 105, and is optically coupled to the optical fiber 107 for transmission within the optical fiber 107. The focusing lenses 104 and 105 are examples of optical components.

[0065] Additionally, a refrigerant passage 109 is provided on the base 101 to cool the sub-unit 100a (light-emitting module 10A), fiber optic support 106a, focusing lenses 104 and 105, synthesizer 108a, and shielding part 101d1 (described later). A refrigerant, such as a coolant liquid, flows through the refrigerant passage 109. The refrigerant passage 109 is thermally connected to the components and parts to be cooled, such as the sub-unit 100a (light-emitting module 10A), fiber optic support 106a, focusing lenses 104 and 105, and synthesizer 108a, near the mounting surface of each component of the base 101, for example, directly below or near it, via its inner surface and the refrigerant (not shown) within the refrigerant passage 109. Heat exchange occurs between the refrigerant and the components and parts via the base 101, thereby cooling the components. It should be noted that, as an example, the inlet 109a and outlet 109b of the refrigerant passage 109 are located at the ends of the base 101 in opposite directions of the Y direction, but they can also be located in other positions.

[0066] [Subunit]

[0067] Figure 3 This is a side view showing the structure of sub-unit 100a1 (100a) of array A1. It should be noted that, regarding sub-unit 100a2 of array A2, the configuration of the optical components and the direction of laser transmission are opposite to those of sub-unit 100a1, but it has the same structure as sub-unit 100a1.

[0068] The light-emitting module 10A has a chip-on-submount (COP) chip 30 and a housing 20 that accommodates the COP chip 30. It should be noted that... Figure 3 In the image, the light-emitting module 10A is depicted with a view of the interior of the housing 20.

[0069] The housing 20 is a cuboid box that houses the sub-base chip 30. The housing 20 has a wall member 21 and a window member 22. The wall member 21 is made of, for example, a metal material.

[0070] Additionally, the housing 20 has a base 21a. The base 21a has a plate-like shape intersecting the Z direction. The base 21a is, for example, part of the wall member 21 (bottom wall). The base 21a is, for example, made of a metal material with high thermal conductivity such as oxygen-free copper. Oxygen-free copper is an example of a copper-based material. It should be noted that the base 21a may also be separately provided from the wall member 21.

[0071] An opening 21b is provided at the end of the wall member 21 in the X1 direction. A window member 22 for transmitting laser L is installed in the opening 21b. The window member 22 intersects and is orthogonal to the X1 direction. Laser L emitted from the sub-base chip 30 in the X1 direction passes through the window member 22 and exits outside the light-emitting module 10A. Laser L is emitted from the light-emitting module 10A in the X1 direction.

[0072] The boundary portions of the multiple components (not shown) constituting the wall member 21 (shell 20), as well as the boundary portion between the wall member 21 and the window member 22, are sealed in a way that prevents gas from passing through. That is, the shell 20 is airtight. It should be noted that the window member 22 is also part of the wall member 21.

[0073] The sub-base chip 30 includes a sub-base 31 and a light-emitting element 32. The sub-base chip 30 can also be referred to as a semiconductor laser module.

[0074] The sub-base 31 has, for example, a plate-like shape that is perpendicular and orthogonal to the Z-direction. The sub-base 31 can be made of an insulating material with high thermal conductivity, such as aluminum nitride, ceramic, or glass. A metallization layer 31a is formed on the sub-base 31 as an electrode for supplying power to the light-emitting element 32.

[0075] The sub-base 31 is mounted on the base 21a. The light-emitting element 32 is mounted on the top surface of the sub-base 31. That is, the light-emitting element 32 is mounted on the base 21a via the sub-base 31, and is mounted on the base 101 via the sub-base 31 and the housing 20.

[0076] The light-emitting element 32 is, for example, a semiconductor laser element having a fast axis (FA) and a slow axis (SA). The light-emitting element 32 has an elongated shape extending in the X1 direction. The light-emitting element 32 emits laser light L in the X1 direction from an emission opening (not shown) at its end in the X1 direction. The sub-mount chip 30 is mounted such that the fast axis of the light-emitting element 32 is along the Z direction and the slow axis is along the Y direction. The Z direction is an example of the fast axis direction, and the Y direction is an example of the slow axis direction.

[0077] The laser L emitted from the light-emitting element 32 is collimated in at least the Z and Y directions by passing through lenses 41A, 42A, and 43A in sequence. Lenses 41A, 42A, and 43A are all disposed outside the housing 20.

[0078] In this embodiment, lenses 41A, 42A, and 43A are arranged sequentially in the X1 direction. The laser L emitted from the light-emitting element 32 passes sequentially through lenses 41A, 42A, and 43A. Furthermore, during the period before the laser L is emitted from the light-emitting element 32 and passes through lenses 41A, 42A, and 43A, the optical axis of the laser L is linear, with the fast axis direction along the Z direction and the slow axis direction along the Y direction.

[0079] Lens 41A is slightly separated from window member 22 in the X1 direction, or is connected to window member 22 in the X1 direction.

[0080] Laser L is incident on lens 41A through window member 22. Lens 41A is a lens having an axisymmetric shape with respect to the central axis Ax along the optical axis, and is configured as a body of revolution about the central axis Ax. Lens 41A is arranged such that the central axis Ax is along the X1 direction and overlaps with the optical axis of laser L. The incident surface 41a and the exit surface 41b of lens 41A each have a surface of revolution about the central axis Ax extending along the X1 direction. The exit surface 41b is a convex surface convex in the X1 direction. The exit surface 41b protrudes more than the incident surface 41a. Lens 41A is a so-called convex lens.

[0081] The beam width of the laser L emitted from lens 41A narrows as it propagates in the X1 direction. It should be noted that the beam width is the width of the region within the laser beam profile where the light intensity exceeds a specified value. This specified value is, for example, 1 / e of the peak light intensity. 2 Lens 41A focuses the laser L in the Z direction, Y direction, and the direction between the Z and Y directions, thus achieving the effect of reducing the aberration of the laser L.

[0082] Lens 42A has a plane-symmetrical shape relative to an imaginary center plane Vc2 that is orthogonal to the Z direction. The incident surface 42a and the exit surface 42b of lens 42A have generatrices along the Y direction and cylindrical surfaces extending along the Y direction. The incident surface 42a is a convex surface protruding in the opposite direction to the X1 direction. Conversely, the exit surface 42b is a concave surface recessed in the X1 direction.

[0083] When the beam width Wzc of lens 42A in the Z direction is smaller than the beam width Wza in the Z direction at the incident surface 41a of lens 41A, the laser L is collimated in the Z direction, i.e., on the fast axis. Lens 42A is a concave lens in a section orthogonal to the Y direction. Lens 42A can also be called a collimating lens.

[0084] Furthermore, lens 42A is located closer to lens 41A than the focal point Pcz of laser L in the Z direction. If lens 42A were located further away from lens 41A than the focal point Pcz in the Z direction, a focal point Pcz in the Z direction would appear in the optical path of laser L between lenses 41A and 42A. In this case, undesirable conditions such as debris accumulation at the focal point Pcz in the Z direction, where energy density is high, may occur. Regarding this, in this embodiment, lens 42A is located closer to lens 41A than the focal point Pcz in the Z direction, and therefore is collimated by lens 42A before laser L reaches the focal point Pcz. That is, according to this embodiment, the focal point Pcz in the Z direction does not appear in the optical path of laser L, thus avoiding undesirable conditions caused by this focal point Pcz.

[0085] It should be noted that the focal point of laser L in the Y direction (not shown) appears between lens 41A and lens 42A, but the energy density at the focal point in the Y direction is not very high, so it will not cause problems such as the accumulation of waste.

[0086] The beam width of the laser L emitted from the light-emitting element 32 and passing through lenses 41A and 42A in the Y direction expands as it propagates in the X1 direction. The laser L with a thicker leading edge that expands in the Y direction enters lens 43A through lens 42A.

[0087] Lens 43A has a plane-symmetrical shape relative to an imaginary center plane that is orthogonal to the Y direction. The incident surface 43a and the exit surface 43b of lens 43A have generatrices along the Z direction and cylindrical surfaces extending along the Z direction. The incident surface 43a is a plane orthogonal to the X1 direction. Furthermore, the exit surface 43b is a convex surface convex in the X1 direction.

[0088] Lens 43A collimates the laser L in the Y direction, i.e., on the slow axis. Lens 43A is a convex lens in a section orthogonal to the Z direction. Lens 43A can also be called a collimating lens.

[0089] [Shelter]

[0090] like Figure 1As shown, in sub-units 100a1 of array A1 and 100a2 of array A2, when the laser propagates in mutually opposing directions, stray light (leakage light) from the laser propagating towards the other array in sub-unit 100a of one of the arrays A1 and A2 may interfere with the laser in the other array's sub-unit 100a. Furthermore, when lenses 41A to 43A are bonded to the base 101 via a bonding material (not shown), stray light irradiating the bonding material may damage it. Stray light can originate, for example, from laser light that deviates from its intended optical path through unintentional reflection or transmission in various optical components.

[0091] Therefore, in this embodiment, a shielding portion 101d1 is provided between array A1 and array A2 to block stray light. The shielding portion 101d1 blocks stray light from the lenses 41A-43A and reflector 103 of sub-unit 100a1 toward the lenses 41A-43A and reflector 103 of sub-unit 100a2 in the X1 direction, and reflects the stray light in a direction offset from the lenses 41A-43A and reflector 103 of sub-unit 100a1. Furthermore, the shielding portion 101d1 blocks stray light from the lenses 41A-43A and reflector 103 of sub-unit 100a2 toward the lenses 41A-43A and reflector 103 of sub-unit 100a1 in the X2 direction, and reflects the stray light in a direction offset from the lenses 41A-43A and reflector 103 of sub-unit 100a2. The lenses 41A to 43A and the reflector 103 included in subunit 100a1 are an example of a first optical component, and the lenses 41A to 43A and the reflector 103 included in subunit 100a2 are an example of a second optical component. Furthermore, the X1 direction is an example of a first direction, and the X2 direction is an example of the opposite direction to the first direction.

[0092] Figure 4 This is a side view of the shielding portion 101d1. The shielding portion 101d1 protrudes from the surface 101b in the Z direction. The position of the top of the shielding portion 101d1 in the Z direction, that is, its height from the surface 101b, is set to be sufficient to block the stray light Ls indicated by the dashed arrow. For example, the position of the top of the shielding portion 101d1 in the Z direction is at least the same as or further forward of the top of the lenses 41A to 43A included in the subunit 100a in the Z direction.

[0093] The shielding part 101d1 can be installed on the surface 101b of the base 101 by means of bonding materials such as adhesives or solders, or by welding, or by means of fasteners such as screws, or it can be integrally formed with the base 101. The adhesive can be an electromagnetic wave curing adhesive, a thermosetting adhesive, and preferably an adhesive with high thermal conductivity.

[0094] Furthermore, in this embodiment, the shielding portion 101d1 has reflective surfaces 101da at its ends in the X1 direction and X2 direction, respectively. These reflective surfaces 101da are inclined relative to the Z direction so that the reflected light Lsr does not return (does not contact) optical components such as the reflector 103 and lenses 41A to 43A, but is deflected relative to these optical components to the side opposite to the surface 101b of the base 101. Stray light Ls traveling in the X1 direction is reflected by the reflective surface 101da at the X2 direction end of the shielding portion 101d1 in a direction between the X2 direction and the Z direction. On the other hand, stray light Ls traveling in the X2 direction is reflected by the reflective surface 101da at the X1 direction end of the shielding portion 101d1 in a direction between the X1 direction and the Z direction.

[0095] Furthermore, the reflective surface 101da is coated with a paint, such as black paint, that converts laser energy into heat energy. In this case, the reflective surface 101da functions as an absorbing surface that absorbs laser energy. The reflective surface 101da is an example of an absorbing surface. With this structure, the intensity of reflected light in the reflective surface 101da can be further reduced, thus preventing or reducing the negative impact of reflected light on other parts.

[0096] Furthermore, a refrigerant passage 109 for the flow of refrigerant C is provided on the base 101 in a manner that overlaps with the shielding portion 101d1 in the Z direction. The refrigerant passage 109 is provided such that a portion of the interval between the inlet 109a and the outlet 109b of the refrigerant passage 109 overlaps with the shielding portion 101d1 in the Z direction. Within this interval, the refrigerant passage 109 extends, for example, along the shielding portion 101d1 in the Y direction.

[0097] The shielding portion 101d1 and the base 101 are made of a material with high thermal conductivity, such as copper-based or aluminum-based materials. The shielding portion 101d1 is thermally connected to the inner surface of the refrigerant passage 109 and the refrigerant C via the base 101. Therefore, according to this embodiment, heat exchange occurs between the refrigerant C and the shielding portion 101d1 via the base 101, and the shielding portion 101d1, which generates heat based on the energy of stray light Ls, is cooled, thus suppressing the temperature rise of the shielding portion 101d1 and its surroundings.

[0098] [Angle of the reflecting surface]

[0099] Figure 5This is a side view taken along the Y direction, showing the shielding part 101d1 and the optical component 40 corresponding to the sub-unit 100a1 of array A1. The optical component 40 is an optical component included in the sub-unit 100a1 of array A1, and is any one of the lenses 41A to 43A and the mirror 103.

[0100] exist Figure 5 In the image, the end of the reflected light Lsr at the reflecting surface 101da of the shielding portion 101d1 relative to the stray light Ls advancing in the X1 direction from array A1, on the side of surface 101b, overlaps exactly at point Pe with the end of the X1 direction end face 40a of the optical component 40 in the Z direction. Therefore, if the reflected light Lsr and Figure 5 If the optical component 40 is located on the opposite side of the surface 101b, the reflected light Lsr will not illuminate the optical component 40.

[0101] exist Figure 5 In the diagram, the stray light Ls traveling along the X1 direction has an incident angle of α relative to the reflecting surface 101da. The reflected light Lsr travels in the Dr direction, between the X2 and Z directions, with an elevation angle of 2α relative to the X2 direction. The beam width (diameter) of both the stray light Ls and the reflected light Lsr is Wb. Pa is the point on the optical axis Ax1 of the stray light Ls aligned with point Pe in the Z direction, and Pc is the point on the optical axis Ax1 of the reflected light Lsr aligned with point Pe in the Z direction. Furthermore, let Xd be the distance between point Pa and point Pb in the X1 direction, Zd be the distance between point Pa and point Pe in the Z direction, Zv be the distance between point Pa and point Pc in the Z direction, and Zi be the distance between point Pe and point Pc. Additionally, the N direction is the normal direction of the reflecting surface 101da at point Pb. It should be noted that the beam width can, for example, be set to have an intensity equal to 1 / e of the peak intensity. 2 The width and intensity of the region mentioned above are the widths of regions where the intensity is at or above a specified ratio relative to the peak intensity. Here, the specified ratio is, for example, a value of 0.1% or more and 1% or less. In addition, the beam width Wb of the laser from the light-emitting element when collimated by the collimating lens can be calculated based on the focal length f and the numerical aperture NA of the collimating lens using the formula Wb = 2 × f × NA.

[0102] In this case, the triangle connecting points Pa, Pb, and Pc is a right triangle, therefore Zv = Xd · tan(2α). Furthermore, Zd = Zv - Zi, and Zi = 0.5Wb / cos(2α). Therefore, in Figure 5 In the state,

[0103] Zd=Zv-Zi=Xd·tan(2α)-0.5Wb / cos(2α) is established.

[0104] Therefore, in order to reflect light Lsr and Figure 5 Compared to the state where the optical component 40 is located on the opposite side of the surface 101b, the following equation (1) holds true.

[0105] Xd·tan(2α)-0.5·Wb / cos(2α)>Zd···(1)

[0106] exist Figure 5 In this case, X1 is an example of a third direction, Z is an example of a fourth direction, and Dr is an example of a fifth direction. Additionally, there is an example where point Pe is an endpoint and point Pb is an example of a reflection point. It should be noted that sub-unit 100a2 of array A2 has the same... Figure 5 The structure is a mirror image of the structure. Therefore, for subunit 100a2, as long as the condition of equation (1) is satisfied, the interference between the reflected light Lsr and the optical component 40 can be avoided. However, for subunit 100a2, X1 direction is an example of a third direction, X2 direction is an example of the opposite direction of the third direction, and Z direction is an example of a fourth direction.

[0107] As explained above, in this embodiment, the shielding portion 101d1 blocks stray light from the lenses 41A-43A and the reflector 103 (first optical component) of the optical component 40 of the sub-unit 100a1 toward the lenses 41A-43A and the reflector 103 (second optical component) of the optical component 40 of the sub-unit 100a2 in the X1 direction, and reflects the stray light in a direction offset from the optical component 40 (first optical component) of the sub-unit 100a1. Furthermore, the shielding portion 101d1 blocks stray light from the lenses 41A-43A and the reflector 103 of the sub-unit 100a2 toward the lenses 41A-43A and the reflector 103 of the sub-unit 100a1 in the X2 direction, and reflects the stray light in a direction offset from the optical component 40 of the sub-unit 100a2.

[0108] According to this structure, for example, it is possible to suppress stray light from the first optical component and laser interference transmitted by the second optical component, or to suppress adverse conditions such as damage to the bonding materials of the first and second optical components due to the stray light.

[0109] Furthermore, as in this embodiment, the shielding portion 101d1 can also reflect stray light in a direction away from the base 101. If stray light is reflected in a direction closer to the base 101, adverse effects may occur due to secondary reflections from the base 101. In this regard, as in this embodiment, if the shielding portion 101d1 reflects stray light in a direction away from the base 101, adverse effects caused by secondary reflections from the base 101 can be easily avoided, for example.

[0110] Furthermore, as in this embodiment, the shielding portion 101d1 can also reflect and absorb stray light. With this structure, for example, the intensity of the reflected stray light can be reduced in the shielding portion 101d1, thus further suppressing adverse conditions caused by the reflected light.

[0111] Furthermore, as in this embodiment, the shielding portion 101d1 can be located between subunit 100a1 and subunit 100a2. With this structure, for example, the shielding portion 101d1 can be shared between subunits 100a1 and 100a2. Therefore, compared to a structure where shielding portions 101d1 are provided for subunits 100a1 and 100a2 respectively, it is possible to achieve advantages such as reducing the number of components, reducing manufacturing time and cost of the optical device 100A, and enabling a more compact configuration of the optical device 100A.

[0112] [Second Implementation]

[0113] Figure 6 This is a top view of the subunit 100a1 (100a) included in the optical device 100B (100) of the second embodiment. (Except for replacing...) Figure 1 The subunit 100a shown is provided with Figure 6 Except for the subunit 100a shown, the optical device 100B has the same structure as the optical device 100A of the first embodiment. It should be noted that... Figure 6 The diagram shows sub-cell 100a1 of array A1, but sub-cell 100a2 of array A2 also has the same characteristics. Figure 6 The same structure, that is, with Figure 6 The structure is a mirror image of the structure.

[0114] like Figure 6 As shown, lens 41A is joined to light-emitting module 10A via joint 50. Additionally, lens 42A is joined to post 101c via joint 50. Light-emitting module 10A and post 101c are examples of protrusions projecting in the Z direction from surface 101b of base 101. Furthermore, joint 50 is an example of a bonding material.

[0115] The post 101c can be mounted on the surface 101b of the base 101 using bonding materials such as adhesives or solders, or it can be welded, mounted using fasteners such as screws, or integrally formed with the base 101. The adhesive for the post 101c can be an electromagnetic wave curing adhesive or a thermosetting adhesive. It should be noted that the post 101c is disposed on both sides of the lens 42A in the Y direction, but it can also be disposed on only one side.

[0116] Alternatively, the joint 50 may be an adhesive made of a synthetic resin material. The joint 50 may also be an electromagnetic wave curing adhesive or a thermosetting adhesive.

[0117] Furthermore, in this embodiment, a shielding portion 101d2 is provided at a position separated from the junction 50 in the X1 direction to block stray light Ls directed toward the junction 50. With this structure, stray light Ls from the sub-unit 100a of the other array of arrays A1 and A2 is irradiated onto the junction 50 included in the sub-unit 100a of one of the arrays A1 and A2, thereby suppressing damage to the junction 50. According to this embodiment, for example, it is possible to achieve the shielding portion 101d2 with a relatively compact structure. It should be noted that when the optical device 100B also includes the shielding portion 101d1 of the first embodiment described above, for example, it is possible to more reliably avoid adverse effects caused by stray light Ls. Furthermore, when the optical device 100B does not include the shielding portion 101d1 of the first embodiment described above, for example, it is possible to construct the optical device 100B with a lighter weight.

[0118] Figure 7 This is a side view of the shielding part 101d2. (Example) Figure 7 As shown, in this embodiment, the shielding portion 101d2 also has the same reflective surface 101da as in the first embodiment described above. The reflection direction of stray light Ls by the reflective surface 101da is the same as in the first embodiment described above. Therefore, it is easy to avoid adverse conditions caused by reflected light Lsr from the reflective surface 101da. It should be noted that the shielding portion 101d2 can also function as an absorption portion in the same way as in the first embodiment.

[0119] In the optical device 100B of the second embodiment, the same effect as that of the optical device 100A of the first embodiment is also obtained by the shielding part 101d2.

[0120] [Third Implementation Method]

[0121] Figure 8 This is a top view of the optical device 100C (100) according to the third embodiment. (Except for...) Figure 1 The shielding part 101d1 shown is provided with Figure 8 Apart from the plurality of shielding portions 101d3 shown, the optical device 100C has the same structure as the optical device 100A of the first embodiment. The shielding portions 101d3 are respectively disposed between the subunits 100a1 and 100a2. Furthermore, similar to the first embodiment, even in this embodiment, each shielding portion 101d3 is thermally connected to the inner surface of the refrigerant passage 109 and the refrigerant via the base 101.

[0122] Figure 9 It is Figure 8 The optical device 100C shown is illustrated in an enlarged top view of its shielding portion 101d3, reflecting mirror 103, and absorbing portion 101e. (See diagram below.) Figure 9 As shown, the shielding part 101d3 is also capable of shielding stray light Ls from sub-unit 100a1 to sub-unit 100a2, and shielding stray light Ls from sub-unit 100a2 to sub-unit 100a1, just like in the first embodiment described above.

[0123] Furthermore, the shielding portion 101d3 has two reflective surfaces 101da. The reflective surface 101da1 (101da), corresponding to and facing sub-unit 100a1, at its end in the X2 direction, reflects stray light Ls from sub-unit 100a1 in the Y direction. Similarly, the reflective surface 101da2 (101da), corresponding to sub-unit 100a2 and facing it, at its end in the X1 direction, reflects stray light Ls from sub-unit 100a2 in the Y direction. Here, similar to the first embodiment, the Z-direction position of each sub-unit 100a is offset in the opposite direction to the Y direction, and the Z-direction end position of each shielding portion 101d3 is also offset in the opposite direction to the Y direction. Therefore, each reflected light Lsr can travel in the Y direction beyond each shielding portion 101d3 in the Z direction. With this structure, stray light Ls traveling from each subunit 100a1 in the X1 direction becomes reflected light Lsr, which is reflected by the reflecting surface 101da1, parallel to the Z direction, and traveling in the Y direction. Similarly, stray light Ls traveling from each subunit 100a2 in the X2 direction becomes reflected light Lsr, reflected by the reflecting surface 101da2, parallel to the Z direction, and traveling in the Y direction. The reflecting surface 101da1 is an example of a first shielding part, and the reflecting surface 101da2 is an example of a second shielding part. Furthermore, the X1 direction is an example of a first direction, the X2 direction is an example of a direction opposite to the first direction, and the Y direction is an example of a second direction.

[0124] Reflected light Lsr from reflecting surfaces 101da1 and 101da2 in the Y direction is input to the end face 101e1 of the absorbing part 101e. The absorbing part 101e protrudes from the surface 101b of the base 101 in the Z direction. A coating, such as black paint, is applied to the end face 101e1 to convert laser energy into heat energy. In this case, the end face 101e1 functions as an absorbing surface that absorbs laser energy. The end face 101e1 can also be referred to as an absorbing surface. Furthermore, the end face 101e1 is inclined relative to the Z direction, so that even if reflected light Lsr that is not absorbed in the end face 101e1 is reflected by the end face 101e1, it will not return to the shielding part 101d3 but will leave from the surface 101b of the base 101 and travel in the direction between the opposite direction of the Y direction and the Z direction. That is, the normal direction of the end face 101e1 has an elevation angle greater than 0° and less than 90° relative to the opposite direction of the Y direction. Furthermore, the refrigerant passage 109 provided on the base 101 is provided in such a way that it partially overlaps with the absorption section 101e in the Z direction, and the inner surface of the absorption section 101e and the refrigerant passage 109 and the refrigerant are thermally connected through the base 101.

[0125] According to this embodiment, by using the absorption section 101e corresponding to the reflected light Lsr, it is possible to obtain the advantage of being able to process the reflected light Lsr, i.e., stray light Ls, more reliably. Furthermore, according to this embodiment, multiple reflected light Lsr can be processed centrally in the absorption section 101e. Therefore, compared to the case where absorption sections for processing multiple reflected light Lsr are provided in multiple locations, it is possible to obtain the advantage of reducing the number of components or further simplifying the structure of the optical device 100C. It should be noted that the absorption section 101e may also be provided corresponding to arrays A1 and A2 respectively.

[0126] Moreover, such as Figure 8As shown, the optical device 100C of this embodiment includes a shielding portion 101d2 corresponding to the synthesizer 108a. The shielding portion 101d2 protrudes from the surface 101b of the base 101 in the Z direction and is capable of blocking stray light Ls from laser L1 input to the synthesizer 108a in the X1 direction that is not reflected in the Y direction and propagates in the X1 direction, and stray light Ls from laser L2 input to the synthesizer 108a in the Y direction that is not transmitted in the Y direction and is reflected and propagates in the X1 direction. In addition, the shielding portion 101d2 has a reflective surface 101da that reflects the stray light Ls from the synthesizer 108a in a direction away from the surface 101b of the base 101, which is offset from optical components such as the synthesizer 108a, the half-wave plate 108c, and the reflector 108b. Moreover, a coating, such as black paint, that converts the energy of the laser into heat energy is applied to the reflective surface 101da. In this case, the reflective surface 101da functions as an absorbing surface that absorbs the energy of stray light Ls. The reflective surface 101da is an example of an absorbing surface. Furthermore, the refrigerant passage 109 provided on the base 101 is configured to partially overlap with the shielding portion 101d2 in the Z direction, and the shielding portion 101d2, the inner surface of the refrigerant passage 109, and the refrigerant are thermally connected via the base 101. Thus, the shielding portion 101d2 can handle stray light Ls from a specific optical element, preventing or reducing the negative impact of the stray light Ls on other parts. The synthesizer 108a is an example of an optical element. The laser L1 input from array A1 to the synthesizer 108a is an example of a first laser, the X1 direction is an example of a sixth direction, and the Y direction is an example of a seventh direction. Additionally, the laser L2 input from array A2 to the synthesizer 108a is an example of a second laser.

[0127] In the optical device 100C of the third embodiment, the same effect as that of the optical device 100A of the first embodiment is also obtained by the shielding parts 101d3 and 101d2.

[0128] [Fourth Implementation Method]

[0129] Figure 10 This is a top view of the optical device 100D (100) of the fourth embodiment. Except for the structure of the optical components of the subunit 100a, the optical device 100D has the same structure as the optical device 100A (100) of the first embodiment.

[0130] In this embodiment, subunit 100a includes a light-emitting module 10E, lens 42B, lens 43B, and reflector 103. The light-emitting module 10E does not have a housing 20, but instead has a sub-mount chip 30. This sub-mount chip 30 is exposed within the housing of the optical device 100D. Lens 42B collimates the laser light from the light-emitting element 32 in the Z direction, i.e., on the fast axis. Furthermore, lens 43B collimates the laser light from lens 42B in the Y direction, i.e., on the slow axis.

[0131] In the optical device 100D of the fourth embodiment, the same effect as that of the optical device 100A of the first embodiment can be obtained by means of the shielding part 101d1.

[0132] [Fifth Implementation]

[0133] Figure 11 This is a top view of the optical device 100E (100) according to the fifth embodiment. The optical device 100E has the same structure as the optical device 100D of the fourth embodiment, except that it does not have a half-wavelength plate 108c, where the multiple light-emitting elements 32 output lasers of different wavelengths (λ1, λ2, ..., λn-1, λn). The spacing between the multiple wavelengths is, for example, 5 [nm] to 20 [nm] between the center wavelengths. Furthermore, the light synthesized here may also include blue laser light.

[0134] In the optical device 100E of the fifth embodiment, the same effect as that of the optical device 100A of the first embodiment can be obtained by means of the shielding part 101d1.

[0135] [Sixth Implementation Method]

[0136] Figure 12 This is a top view of the optical device 100F (100) according to the sixth embodiment. The optical device 100F includes multiple optical fibers 107A for inputting laser light from the outside, but does not include a light-emitting module. The multiple optical fibers 107A input laser light of different wavelengths. Each optical fiber 107A is supported by an optical fiber support 106a. The optical device 100F may also be referred to as a light combining device.

[0137] The optical device 100F includes a lens 44, a mirror 103, a filter 108D, and a lens 45. Laser light from multiple optical fibers 107A is transmitted to the end of the optical fiber 107 (not shown) via the lens 44, mirror 103, filter 108d, and lens 45, and is optically coupled to the optical fiber 107. The lens 44, mirror 103, filter 108d, and lens 45 are examples of optical components.

[0138] The reflector 103 reflects the laser beam traveling in the X2 direction in the Y direction. Additionally, lens 44 is, for example, a collimating lens, and lens 45 is, for example, a condensing lens.

[0139] Filter 108d primarily reflects laser L1 directed towards the X2 direction and allows laser L2 directed towards the Y direction to pass through. Here, the X2 direction, the Y direction, and the orientation of filter 108d are set such that both the reflected and transmitted laser light are directed towards the Y direction. That is, the laser light (main light) output from filter 108d and propagating in the Y direction includes the reflected light from laser L1 and the transmitted light from laser L2. Filter 108d is an example of an optical element. Laser L1 is an example of a first laser, the X2 direction is an example of a sixth direction, and the Y direction is an example of a seventh direction. Furthermore, laser L2 is an example of a second laser.

[0140] Lasers L1 and L2 are, for example, light with different wavelengths. As an example, if the wavelength of laser L1 is longer than the wavelength of laser L2, filter 108d is, for example, a low-pass filter.

[0141] Alternatively, the wavelength of laser L1 can be shorter than the wavelength of laser L2. In this case, filter 108d is, for example, a high-pass filter.

[0142] In filter 108d, it is difficult to obtain 100% reflection and transmission characteristics. In fact, the transmitted laser L1 and the reflected laser L2 are generated, which become stray light Ls from these filters 108d. The stray light Ls travels from filter 108d toward the X2 direction.

[0143] Therefore, the optical device 100F includes a shielding portion 101d2 that blocks and reflects stray light from the filter 108d. The shielding portion 101d2 has the same structure as the shielding portion 101d2 provided in the optical device 100C of the third embodiment described above. Therefore, in this embodiment, the same effect as that of the optical device 100C of the third embodiment can also be obtained by the shielding portion 101d2.

[0144] [Seventh Implementation Method]

[0145] [Structure of light source device and fiber laser]

[0146] Figure 13This is a structural diagram of a seventh embodiment of a light source device 110 equipped with any one of the optical devices 100 (light-emitting devices) described in the first to fifth embodiments. The light source device 110 includes multiple optical devices 100 as excitation light sources. Laser light output from the multiple optical devices 100 is transmitted via an optical fiber 107 to a combiner 90, which serves as an optical coupling unit. The output end of the optical fiber 107 is coupled to multiple input ports of the combiner 90, which has multiple inputs 1 and outputs. It should be noted that the light source device 110 is not limited to having multiple optical devices 100; having at least one optical device 100 is sufficient. Furthermore, the combiner 90 may be configured similarly to the optical device 100F of the sixth embodiment described above, and may include a shielding portion 101d2.

[0147] [Eighth Implementation Method]

[0148] Figure 14 It is installed Figure 13 The structural diagram of the fiber laser 200 in the light source device 110. The fiber laser 200 has... Figure 13 The light source device 110, synthesizer 90, rare earth-added fiber 130, and output fiber 140 are shown. High-reflectivity FBGs 120 and 121 (fiber brag grating) are respectively provided at the input and output ends of the rare earth-added fiber 130.

[0149] The output end of the synthesizer 90 is connected to the input end of the rare-earth-added fiber 130, and the output end of the rare-earth-added fiber 130 is connected to the input end of the output-side fiber 140. It should be noted that the input section for inputting the laser output from the multiple optical devices 100 to the rare-earth-added fiber 130 can be replaced by other configurations instead of the synthesizer 90. For example, it can be configured such that the fibers 107 of the output sections of the multiple optical devices 100 are arranged in a specific configuration, and an input section such as an optical system including lenses is used to input the laser output from the multiple fibers 107 to the input end of the rare-earth-added fiber 130. The rare-earth-added fiber 130 is an example of an optical amplification fiber.

[0150] According to the light source device 110 of the seventh embodiment or the fiber laser 200 of the eighth embodiment, the same effect as the first to sixth embodiments can be obtained by including the optical device 100 of the first to sixth embodiments.

[0151] The above embodiments of the present invention have been illustrated, but these embodiments are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of various structures, shapes, etc. (construction, type, orientation, form, size, length, width, thickness, height, quantity, arrangement, position, material, etc.) can be appropriately modified for implementation.

[0152] For example, the optical component is not limited to the optical component disclosed in the embodiments. For example, it may also be other optical components that reflect, refract, or diffract light, such as prisms or diffractive optical elements. It should be noted that the diffractive optical element is, for example, a combination of multiple diffraction gratings with different periods to form a single unit.

[0153] Furthermore, the structure, configuration, and combination of the sub-units, light-emitting modules, various optical components, protrusions, shielding parts, etc., are not limited to the above-described embodiments. Additionally, the direction of stray light propagation is not limited to the directions described above.

[0154] Furthermore, in the above embodiments, such as Figure 4 , 7 As shown, the reflective surface 101da of the shielding portions 101d1 and 101d2 has a planar shape, but is not limited to this. For example, the reflective surface 101da can also be as follows: Figure 15 The shape shown has a convex curved surface. Additionally, in Figure 15 In the modified example, the reflecting surface 101da has a curved shape only at the location irradiated by stray light Ls, but it is not limited to this; the reflecting surface 101da may also have a curved shape overall. In addition, the reflecting surface may also have a concave curved shape.

[0155] Industrial availability

[0156] This invention can be used in optical devices, light source devices, and fiber lasers.

[0157] Explanation of reference numerals in the attached figures

[0158] 10A...Light-emitting module (protrusion)

[0159] 10E...Light Emitting Module

[0160] 20...shell

[0161] 21...wall components

[0162] 21a...base

[0163] 21b...Opening

[0164] 22... Window components

[0165] 30... Sub-base chip

[0166] 31... Sub-base

[0167] 31a...Metalling layer

[0168] 32...Light-emitting element

[0169] 40... Optical components

[0170] 40a...end face

[0171] 41A... Lens (Optical Components, First Optical Component, Second Optical Component)

[0172] 41a...incident surface

[0173] 41b...Ejection surface

[0174] 42A, 42B... Lenses (optical components, first optical component, second optical component)

[0175] 42a...incident surface

[0176] 42b...Ejection surface

[0177] 43A, 43B... Lenses (optical components, first optical component, second optical component)

[0178] 43a...incident surface

[0179] 43b...Ejection surface

[0180] 44, 45... lenses

[0181] 50...Joint (Joint Material)

[0182] 90... synthesizer

[0183] 100, 100A~100F... Optical devices

[0184] 100a... subunit

[0185] 100a1... Sub-unit (first sub-unit)

[0186] 100a2... Sub-unit (Second Sub-unit)

[0187] 101...base

[0188] 101b... Surface

[0189] 101c... Column (protrusion)

[0190] 101d1, 101d2, 101d3... Shielding sections

[0191] 101da...Reflective surface (absorbent surface)

[0192] 101da1...Reflective surface (first shielding part)

[0193] 101da2...Reflective surface (second shielding part)

[0194] 101e... Absorption section

[0195] 101e1...End face

[0196] 103...Reflector (Optical components, first optical component, second optical component)

[0197] 104, 105... Condensing lenses (optical components)

[0198] 106a...Fiber Optic Support

[0199] 107... fiber optic

[0200] 107A...Fiber Optic

[0201] 108...Photosynthesis Department

[0202] 108a... Synthesizer (Optical Components, Optical Elements)

[0203] 108b...Reflector (Optical Component)

[0204] 108c...1 / 2 wavelength plate (optical component)

[0205] 108d... Filter (Optical Components, Optical Elements)

[0206] 109...Refrigerant Path

[0207] 109a...Entrance

[0208] 109b...Export

[0209] 110...Light source device

[0210] 120, 121... High reflectivity FBG

[0211] 130... Rare earth elements with added optical fibers

[0212] 140... Output side fiber

[0213] 200... Fiber laser

[0214] Ax...Central Axis

[0215] Ax1...optical axis

[0216] A1, A2... arrays

[0217] C...refrigerant

[0218] Dr... direction (Fifth direction)

[0219] L...laser

[0220] L1...Laser (First Laser)

[0221] L2...laser (second laser)

[0222] Ls... Stray light

[0223] Lsr...reflected light

[0224] N...direction (normal direction)

[0225] Pa, Pc... points

[0226] Pb... point (reflection point)

[0227] Pcz...Focus

[0228] Pe...point (endpoint)

[0229] Vc2...Imaginary central surface

[0230] Wb...beam width

[0231] Wza... (beam width in the Z direction)

[0232] Wzc... (the beam width collimated in the Z direction)

[0233] X...direction

[0234] Xd... distance

[0235] X1... directions (first direction, third direction, sixth direction)

[0236] X2... directions (opposite to the first direction, opposite to the third direction, sixth direction)

[0237] Y... direction (second direction, seventh direction)

[0238] Z... direction (fourth direction)

[0239] Zd... distance

[0240] α... angle of incidence.

Claims

1. An optical device, wherein, The optical device includes: Base; A light-emitting element is disposed on the base and outputs laser light; Multiple optical components are disposed on the base and guide the laser emitted from the light-emitting element to an optical fiber and couple thereto. as well as A shielding portion is disposed on the base and blocks stray light that deviates from the predetermined optical path and is directed toward the second optical component, which is the optical component, in the first optical component, and reflects the stray light in a direction offset from the base in a manner that is further away from the base than the end of the first optical component furthest from the base.

2. The optical device according to claim 1, wherein, The shielding portion reflects and absorbs the stray light.

3. The optical device according to claim 1 or 2, wherein, The first optical component is fixed to the base via a bonding material. The shielding portion blocks stray light directed toward the bonding material.

4. The optical device according to claim 3, wherein, The first optical component is fixed to a protrusion extending from the surface of the base via the bonding material.

5. The optical device according to claim 1 or 2, wherein, The optical device includes: The first subunit includes at least one of the optical components that transmit laser light in a first direction; as well as The second subunit includes at least one of the optical components that transmits laser light in the opposite direction to the first direction. The shielding portion blocks and reflects at least one of the stray light traveling from the first subunit toward the first direction and the stray light traveling from the second subunit toward the opposite direction to the first direction.

6. The optical device according to claim 5, wherein, The shielding portion blocks stray light traveling from the first subunit in the first direction and stray light traveling in the opposite direction from the second subunit in the first direction, and reflects it.

7. The optical device according to claim 5, wherein, The shielding portion is located between the first sub-unit and the second sub-unit.

8. The optical device according to claim 1 or 2, wherein, The optical device includes: Multiple first sub-units, each comprising at least one of the optical components that transmits laser light in a first direction; Multiple shielding parts are provided corresponding to each of the first sub-units, and each serves as a shielding part that blocks the stray light moving in the first direction and reflects the stray light in the second direction. as well as An absorption section receives and absorbs the stray light reflected by the plurality of shielding sections.

9. The optical device according to claim 1 or 2, wherein, The optical device includes: Multiple first sub-units, each comprising at least one of the optical components that transmits laser light in a first direction; Multiple first shielding parts are provided corresponding to each of the first sub-units, and each serves as a shielding part that blocks the stray light moving in the first direction and reflects the stray light in the second direction. Multiple second sub-units, each comprising at least one of the optical components that transmits laser light in the opposite direction to the first direction; Multiple second shielding parts are provided corresponding to each of the second sub-units, and each serves as a shielding part that blocks the stray light that is moving in the opposite direction to the first direction and reflects the stray light in the second direction. as well as An absorption section receives and absorbs stray light from the plurality of first shielding sections and the plurality of second shielding sections.

10. The optical device according to claim 1 or 2, wherein, The shielding portion has a reflective surface that reflects the stray light directed toward a third direction in a direction opposite to that third direction and in a fourth direction orthogonal to the third direction in a fifth direction. In the structure of the optical component having an end point, the end point is separated from the reflective surface in the opposite direction of the third direction, protrudes from the surface of the base in the fourth direction, and is the end point of the end face in the fourth direction of the third direction. Let Xd be the distance in the third direction between the endpoint and the optical axis of the stray light in the reflecting surface, i.e., the distance in the third direction from the reflection point. Let the distance between the optical axis and the endpoint in the fourth direction be Zd. Let the incident angle of the stray light relative to the reflecting surface be α. When the width of the stray light beam is set to Wb, The following formula (1) is satisfied. Xd・tan(2α)-0.5・Wb / cos(2α)>Zd・・・(1).

11. The optical device according to claim 1 or 2, wherein, The base is provided with a cooling passage for refrigerant to pass through. The shielding portion is thermally connected to the refrigerant via the base.

12. An optical device, wherein, The optical device includes: Base; Multiple optical components, mounted on the base, guide the laser to and couple it to the optical fiber; and A shielding portion, disposed on the base, blocks stray light deviating from the predetermined optical path in the first optical component included among the plurality of optical components, and reflects the stray light in a direction offset from the base in a manner that is further away from the base than the end of the first optical component furthest from the base.

13. The optical device according to claim 12, wherein, The optical device includes a base, and the base has a surface on which the plurality of optical components are disposed. The shielding portion protrudes from the surface and reflects the stray light away from the surface.

14. The optical device according to claim 1 or 12, wherein, The optical component includes an optical element that reflects a first laser beam traveling in a sixth direction toward a seventh direction and allows a second laser beam traveling in the seventh direction to pass through. The stray light from the optical element includes at least one of the stray light of the first laser beam that is not reflected by the optical element and propagates from the optical element toward the sixth direction, and the stray light of the second laser beam that does not pass through the optical element and propagates from the optical element toward the sixth direction. The shielding portion is located at a position separated from the optical element in the sixth direction.

15. A light source device, wherein, The light source device includes the optical device according to any one of claims 1 to 14.

16. A fiber laser, wherein, The fiber laser comprises: The light source device according to claim 15; and An optical amplifying fiber amplifies the laser emitted from the light source device.

Images