Optical device, light source device, and optical fiber laser

Abstract

To provide an optical device having a new improved configuration capable of suppressing an adverse effect of stray light, a light source device, and an optical fiber laser.SOLUTION: An optical device 100A comprises: a base 101; a light-emitting element that is provided on the base and outputs laser light; a plurality of optical components that are provided on the base and lead the laser light outputted from the light-emitting element to an optical fiber 107 and couple the laser light to the optical fiber; and a shielding part 101d1 that is provided on the base and blocks stray light that deviates from a prescribed optical path in a first optical component as an optical component and toward a second optical component as an optical component, and reflects the stray light in a direction that diverges from the first optical component. In the optical device, the shielding part may reflect stray light in a direction away from the base.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] 2. Description of the Related Art Conventionally, optical devices equipped with a processing section that processes stray light (leakage light), which is light that deviates from a predetermined optical path, are known (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0002] [Patent Document 1] International Publication No. 2017 / 134911 Summary of the Invention [Problem to be solved by the invention]

[0003] In this type of optical device, such as the optical device of Patent Document 1, it is important to suppress the adverse effects of stray light.

[0004] Therefore, one object of the present invention is to provide an optical device, a light source device, and an optical fiber laser having a new and improved configuration capable of suppressing the adverse effects of stray light. [Means for solving the problem]

[0005] The optical device of the present invention includes, for example, a base, a light-emitting element provided on the base and outputting laser light, a plurality of optical components provided on the base and guiding the laser light output from the light-emitting element to an optical fiber and coupling it to the optical fiber, and a shielding portion provided on the base and blocking stray light that deviates from a predetermined optical path in a first optical component as the optical component and heads toward a second optical component as the optical component, and reflecting the stray light in a direction deviating from the first optical component.

[0006] In the optical device, the shielding portion may reflect the stray light in a direction away from the base.

[0007] In the optical device, the shielding portion may reflect and absorb the stray light.

[0008] In the optical device, the first optical component may be fixed to the base via a bonding material, and the shielding portion may block the stray light directed toward the bonding material.

[0009] In the optical device, the first optical component may be fixed to a protrusion protruding from a surface of the base via the bonding material.

[0010] The optical device may include a first subunit including at least one optical component that transmits laser light in a first direction, and a second subunit including at least one optical component that transmits laser light in a direction opposite to the first direction, and the shielding portion may block and reflect at least one of the stray light traveling in the first direction from the first subunit and the stray light traveling in the direction opposite to the first direction from the second subunit.

[0011] In the optical device, the shielding portion may block and reflect both the stray light traveling in the first direction from the first subunit and the stray light traveling in the opposite direction to the first direction from the second subunit.

[0012] In the optical device, the shielding portion may be located between the first subunit and the second subunit.

[0013] The optical device may include a plurality of first subunits each including at least one of the optical components that transmit laser light in a first direction, a plurality of shielding portions provided corresponding to each of the first subunits, each serving as the shielding portion to block the stray light traveling in the first direction and reflect the stray light in a second direction, and an absorbing portion that receives and absorbs the stray light reflected by the plurality of shielding portions.

[0014] The optical device may include a plurality of first subunits each including at least one of the optical components that transmit laser light in a first direction; a plurality of first shielding portions provided corresponding to each of the first subunits and serving as a plurality of shielding portions that block the stray light traveling in the first direction and reflect the stray light in a second direction; a plurality of second subunits each including at least one of the optical components that transmit laser light in a direction opposite to the first direction; a plurality of second shielding portions provided corresponding to each of the second subunits and serving as a plurality of shielding portions that block the stray light traveling in the direction opposite 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.

[0015] In the optical device, the shielding portion has a reflecting surface that reflects the stray light heading toward a third direction in a fifth direction between a direction opposite to the third direction and a fourth direction perpendicular to the third direction, and the optical component is spaced from the reflecting surface in a direction opposite to the third direction, protrudes from the surface of the base in the fourth direction, and has an end point that is an end of an end face in the third direction in the fourth direction. In this configuration, when a distance in the third direction between the end point and a reflection point that is a position of the optical axis of the stray light on the reflecting surface is Xd, a distance in the fourth direction between the optical axis and the end point is Zd, an incident angle of the stray light with respect to the reflecting surface is α, and a beam width of the stray light is Wb, the following formula (1) is satisfied: Xd·tan(2α)-0.5·Wb / cos(2α)>Zd···(1) may be satisfied.

[0016] In the optical device, the base may be provided with a cooling passage through which a coolant passes, and the shielding portion may be thermally connected to the coolant via the base.

[0017] Moreover, the optical device of the present invention includes, for example, a plurality of optical components that guide laser light to an optical fiber and couple it to the optical fiber, and a shielding portion that blocks stray light that deviates from a predetermined optical path in the optical components and reflects the stray light in a direction deviating from the optical components.

[0018] The optical device may include a base having a surface on which the plurality of optical components are provided, and the shielding portion may protrude from the surface and reflect the stray light in a direction away from the surface.

[0019] The optical device may include, as the optical component, an optical element that reflects a first laser light traveling in a sixth direction in a seventh direction and transmits a second laser light traveling in the seventh direction, and stray light from the optical element includes at least one of stray light of the first laser light that is not reflected by the optical element and travels from the optical element in the sixth direction, and stray light of the second laser light that is not transmitted by the optical element and travels from the optical element in the sixth direction, and the shielding portion may be positioned away from the optical element in the sixth direction.

[0020] A light source device of the present invention includes, for example, the optical device.

[0021] Moreover, an optical fiber laser of the present invention includes, for example, the light source device and an optical amplifying fiber that amplifies the laser light emitted from the light source device. Effect of the Invention

[0022] According to the present invention, for example, it is possible to obtain an optical device, a light source device, and an optical fiber laser having a more improved novel configuration capable of suppressing the adverse effects of stray light. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is an illustrative schematic plan view of the optical device according to the first embodiment. [Diagram 2] FIG. 2 is an illustrative schematic perspective view of a base included in the optical device of the first embodiment. [Diagram 3] FIG. 3 is an illustrative schematic side view of a subunit included in the optical device of the first embodiment. [Figure 4]FIG. 4 is an exemplary schematic side view (partial cross-sectional view) of a portion including a shielding portion of the optical device according to the first embodiment. [Diagram 5] FIG. 5 is an exemplary schematic side view of a portion including a shielding portion and optical components of the optical device according to the first embodiment. [Figure 6] FIG. 6 is an exemplary schematic plan view of a portion of the optical device according to the second embodiment. [Figure 7] FIG. 7 is an illustrative schematic side view of a shielding portion included in the optical device according to the second embodiment. [Figure 8] FIG. 8 is an illustrative schematic plan view of the optical device according to the third embodiment. [Figure 9] FIG. 9 is an enlarged view of a portion of FIG. [Figure 10] FIG. 10 is an illustrative schematic plan view of the optical device according to the fourth embodiment. [Figure 11] FIG. 11 is an illustrative schematic plan view of the optical device according to the fifth embodiment. [Figure 12] FIG. 12 is an illustrative schematic plan view of the optical device according to the sixth embodiment. [Figure 13] FIG. 13 is an exemplary configuration diagram of a light source device according to the seventh embodiment. [Figure 14] FIG. 14 is an exemplary configuration diagram of the optical fiber laser according to the eighth embodiment. [Figure 15] FIG. 15 is an illustrative schematic side view of a shielding portion included in an optical device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Exemplary embodiments and modifications of the present invention are disclosed below. The configurations of the embodiments and modifications shown below, as well as the actions and results (effects) brought about by the configurations, are merely examples. The present invention can be realized by configurations other than those disclosed in the following embodiments and modifications. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the configurations.

[0025] The following embodiments and modifications have similar configurations. Therefore, according to the configurations of the embodiments and modifications, similar actions and effects based on the similar configurations can be obtained. In the following, the similar configurations are given the same reference numerals, and duplicated descriptions may be omitted.

[0026] In this specification, ordinal numbers are given for the sake of convenience to distinguish between parts, portions, directions, etc., and do not indicate priority or order.

[0027] In each drawing, the X1 direction is represented by an arrow X1, the X2 direction is represented by an arrow X2, the Y direction is represented by an arrow Y, and the Z direction is represented by an arrow Z. The X1 direction, the Y direction, and the Z direction intersect with each other and are perpendicular to each other. The X1 direction and the X2 direction are opposite to each other.

[0028] 1, 3, 8, and 10 to 12, the optical path of the laser light L is indicated by a solid arrow.

[0029] [First embodiment] FIG. 1 is a schematic configuration diagram of an optical device 100A (100) according to the first embodiment, and is a plan view of the inside of the optical device 100A as viewed in the opposite direction to the Z direction.

[0030] 1, the optical device 100A includes a base 101, a plurality of subunits 100a, a light combining unit 108, condenser lenses 104 and 105, and an optical fiber 107. Laser light output from the light emitting module 10A of each subunit 100a is transmitted to an end (not shown) of the optical fiber 107 via the mirror 103, the light combining unit 108, and the condenser lenses 104 and 105 of each subunit 100a, and is optically coupled to the optical fiber 107. The optical device 100A may also be referred to as a light emitting device.

[0031] The base 101 is made of a material with high thermal conductivity, such as a copper-based material or an aluminum-based material. The base 101 may be composed of one component or multiple components. The base 101 is covered with a cover (not shown). The multiple subunits 100a, the multiple mirrors 103, the light combining unit 108, the condenser lenses 104 and 105, and the end of the optical fiber 107 are all provided on the base 101 and are accommodated in a housing chamber (not shown) formed between the base 101 and the cover. The housing chamber is hermetically sealed.

[0032] The optical fiber 107 is an output optical fiber, and is fixed to the base 101 via a fiber support portion 106a that supports the end portion of the optical fiber.

[0033] The fiber support portion 106a may be configured integrally with the base 101 as part of the base 101, or the fiber support portion 106a may be configured as a separate member from the base 101 and attached to the base 101 via a fastener such as a screw.

[0034] Each of the sub-units 100a includes a light emitting module 10A that outputs a laser beam, a plurality of lenses 41A to 43A, and a mirror 103. The lenses 41A to 43A and the mirror 103 are examples of optical components. The lenses 42A and 43A collimate the laser beam in the fast axis and the slow axis.

[0035] The optical device 100A also includes two arrays A1 and A2 in which a plurality of subunits 100a are arranged at a predetermined interval in the Y direction. In the subunit 100a1 (100a) of the array A1, the light emitting module 10A outputs a laser beam in the X1 direction, the lenses 41A to 43A transmit the laser beam from the light emitting module 10A in the X1 direction, and the mirror 103 reflects the laser beam traveling in the X1 direction in the Y direction. In the subunit 100a1 (100a) of the array A2, the light emitting module 10A outputs a laser beam in the X2 direction, the lenses 41A to 43A transmit the laser beam from the light emitting module 10A in the X2 direction, and the mirror 103 reflects the laser beam traveling in the X2 direction in the Y direction. The subunit 100a1 is an example of a first subunit, and the subunit 100a2 is an example of a second subunit. Moreover, the X1 direction is an example of a first direction, and the X2 direction is an example of a direction opposite to the first direction.

[0036] In this embodiment, the subunits 100a1 of the array A1 and the subunits 100a2 of the array A2 are aligned in the X1 direction (X2 direction). When the subunits 100a1 and the subunits 100a2 are aligned in the X1 direction, for example, the size of the optical device 100A in the Y direction is advantageously reduced. However, this is not limited to this, and the subunits 100a1 and the subunits 100a2 may be offset from each other. For example, each subunit 100a2 may be aligned in the X1 direction with respect to the gap between two subunits 100a1 adjacent to each other in the Y direction.

[0037] FIG. 2 is a perspective view of the base 101. As shown in FIG. 2, the surface 101b of the base 101 is provided with a plurality of steps 101b1 in which the positions of the subunits 100a are shifted in the opposite direction to the Z direction as they move in the Y direction. For each of the arrays A1 and A2 in which the subunits 100a are arranged at a predetermined interval (for example, a constant interval) in the Y direction, the subunits 100a are arranged on each of the steps 101b1. As a result, the Z-direction positions of the subunits 100a included in the array A1 are shifted in the opposite direction to the Z direction as they move in the Y direction, and the Z-direction positions of the subunits 100a included in the array A2 are also shifted in the opposite direction to the Z direction as they move in the Y direction. With this configuration, in each of the arrays A1 and A2, parallel laser beams aligned in the Z direction traveling in the Y direction can be input from the plurality of mirrors 103 to the light combining unit 108. The step 101b1 may be configured to be shifted in a direction inclined in the Y direction or in the opposite direction to the Y direction with respect to the Z direction, so that the laser light travels from each mirror 103 in a direction having a predetermined elevation angle with respect to the Y direction.

[0038] As shown in FIG. 1, the laser light from each mirror 103 is input to a light combining section 108 and combined therein.

[0039] The light combining unit 108 includes a combiner 108a, a mirror 108b, and a half-wave plate 108c. The combiner 108a, the mirror 108b, and the half-wave plate 108c are examples of optical components.

[0040] Mirror 108b directs the laser light from subunit 100a of array A1 through half-wave plate 108c to combiner 108a, which rotates the plane of polarization of the light from array A1.

[0041] The laser light from subunit 100a of array A2 is input directly to combiner 108a.

[0042] The combiner 108a combines the laser lights from the two arrays A1 and A2. The combiner 108a may also be referred to as a polarization combining element.

[0043] The laser light from the combiner 108a is focused by the focusing lenses 104 and 105 toward an end (not shown) of the optical fiber 107, optically coupled to the optical fiber 107, and transmitted through the optical fiber 107. The focusing lenses 104 and 105 are examples of optical components.

[0044] The base 101 is also provided with a refrigerant passage 109 for cooling the subunit 100a (light emitting module 10A), the fiber support 106a, the condenser lenses 104 and 105, the combiner 108a, the shielding portion 101d1 (described later), and the like. In the refrigerant passage 109, for example, a refrigerant such as a cooling liquid flows. The refrigerant passage 109 passes, for example, near the mounting surface of each component of the base 101, for example, directly below or in the vicinity thereof, and the inner surface of the refrigerant passage 109 and the refrigerant (not shown) in the refrigerant passage 109 are thermally connected to the components and parts to be cooled, i.e., the subunit 100a (light emitting module 10A), the fiber support 106a, the condenser lenses 104 and 105, the combiner 108a, and the like. Heat exchange occurs between the refrigerant and the components and parts via the base 101, and the components are cooled. Incidentally, the inlet 109a and the outlet 109b of the coolant passage 109 are provided, for example, at ends of the base 101 on the opposite side in the Y direction, but may be provided at other positions.

[0045] [Subunit] 3 is a plan view showing the configuration of the subunit 100a1 (100a) of the array A1. The subunit 100a2 of the array A2 has the same configuration as the subunit 100a1, although the arrangement of the optical components and the transmission direction of the laser light are opposite to those of the subunit 100a1.

[0046] The light emitting module 10A has a chip-on submount 30 and a case 20 that houses the chip-on submount 30. Note that in Fig. 3, the light emitting module 10A is illustrated with the interior of the case 20 seen through.

[0047] The case 20 is a rectangular parallelepiped box, and houses the chip-on submount 30. The case 20 has a wall member 21 and a window member 22. The wall member 21 is made of, for example, a metal material.

[0048] The case 20 also has a base 21a. The base 21a has a plate shape intersecting the Z direction. The base 21a is, for example, a part (bottom wall) of the wall member 21. The base 21a is 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. The base 21a may be provided separately from the wall member 21.

[0049] An opening 21b is provided at the end of the wall member 21 in the X1 direction. A window member 22 that transmits the laser light L is attached to the opening 21b. The window member 22 intersects with and is perpendicular to the X1 direction. The laser light L emitted from the chip-on submount 30 in the X1 direction passes through the window member 22 and exits to the outside of the light emitting module 10A. The laser light L is emitted from the light emitting module 10A in the X1 direction.

[0050] The boundaries between the multiple members (not shown) constituting the wall member 21 (case 20), as well as the boundary between the wall member 21 and the window member 22, are sealed so that gas cannot pass through. In other words, the case 20 is hermetically sealed. The window member 22 is also a part of the wall member 21.

[0051] The chip-on submount 30 has a submount 31 and a light-emitting element 32. The chip-on submount 30 may also be called a semiconductor laser module.

[0052] The submount 31 has, for example, a plate shape that intersects with and is perpendicular to the Z direction. The submount 31 can be made of an insulating material with relatively high thermal conductivity, such as aluminum nitride, ceramic, or glass. A metallized layer 31a is formed on the submount 31 as an electrode that supplies power to the light emitting element 32.

[0053] The submount 31 is mounted on the base 21a. The light-emitting element 32 is mounted on the top surface of the submount 31. That is, the light-emitting element 32 is mounted on the base 21a via the submount 31, and is also mounted on the base 101 via the submount 31 and the case 20.

[0054] 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) provided at an end in the X1 direction. The chip-on submount 30 is mounted so that the fast axis of the light-emitting element 32 is aligned along the Z direction and the slow axis is aligned 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.

[0055] Laser light L emitted from light emitting element 32 passes through lens 41A, lens 42A, and lens 43A in this order, and is collimated at least in the Z direction and the Y direction. Lens 41A, lens 42A, and lens 43A are all provided outside case 20.

[0056] In this embodiment, the lens 41A, the lens 42A, and the lens 43A are arranged in this order in the X1 direction. The laser light L emitted from the light-emitting element 32 passes through the lens 41A, the lens 42A, and the lens 43A in this order. In addition, the optical axis of the laser light L is linear from the time it leaves the light-emitting element 32 until it passes through the lens 41A, the lens 42A, and the lens 43A, with the fast axis direction of the laser light L aligned along the Z direction and the slow axis direction of the laser light L aligned along the Y direction.

[0057] The lens 41A is slightly spaced from the window member 22 in the X1 direction, or is in contact with the window member 22 in the X1 direction.

[0058] The laser light L that has passed through the window member 22 is incident on the lens 41A. The lens 41A is a lens having an axially symmetric shape with respect to a central axis Ax along the optical axis, and is configured as a body of revolution about the central axis Ax. The lens 41A is disposed such that the central axis Ax is along the X1 direction and overlaps with the optical axis of the laser light L. The entrance surface 41a and the exit surface 41b of the lens 41A each have a surface of revolution about the central axis Ax that extends in the X1 direction. The exit surface 41b is a convex curved surface that is convex in the X1 direction. The exit surface 41b protrudes more than the entrance surface 41a. The lens 41A is a so-called convex lens.

[0059] The beam width of the laser light L emitted from the lens 41A narrows as it travels in the X1 direction. The beam width is the width of a region in the beam profile of the laser light where the light intensity is equal to or greater than a predetermined value. The predetermined value is, for example, 1 / e of the peak light intensity. 2 The lens 41A focuses the laser light L in the Z direction, the Y direction, and a direction between the Z direction and the Y direction, which has the effect of reducing aberration of the laser light L.

[0060] Lens 42A has a plane-symmetric shape with respect to imaginary center plane Vc2, which is a plane that intersects and is perpendicular to the Z direction. Incident surface 42a and exit surface 42b of lens 42A have cylindrical surfaces that have generatrix along the Y direction and extend in the Y direction. Incident surface 42a is a convex curved surface that is convex in the direction opposite to the X1 direction. Also, exit surface 42b is a concave curved surface that is concave in the X1 direction.

[0061] The lens 42A collimates the laser light L in the Z direction, i.e., in the fast axis, in a state in which the beam width Wzc in the Z direction is smaller than the beam width Wza in the Z direction at the incident surface 41a of the lens 41A. The lens 42A is a concave lens in a cross section perpendicular to the Y direction. The lens 42A may also be referred to as a collimating lens.

[0062] Moreover, the lens 42A is positioned closer to the lens 41A than the focal point Pcz in the Z direction of the laser light L by the lens 41A. If the lens 42A is positioned farther from the lens 41A than the focal point Pcz in the Z direction, the focal point Pcz in the Z direction will appear on the optical path of the laser light L between the lens 41A and the lens 42A. In this case, there is a risk of an inconvenience such as dust accumulating at the focal point Pcz in the Z direction, which has a high energy density. In this respect, in this embodiment, since the lens 42A is positioned closer to the lens 41A than the focal point Pcz in the Z direction, the laser light L is collimated by the lens 42A before reaching the focal point Pcz. That is, according to this embodiment, the focal point Pcz in the Z direction does not appear on the optical path of the laser light L, and therefore, it is possible to avoid the inconvenience caused by the focal point Pcz.

[0063] Although the focal point (not shown) of the laser light L in the Y direction appears between the lens 41A and the lens 42A, the energy density at the focal point in the Y direction is not so high, so that problems such as dust accumulation do not occur.

[0064] The beam width in the Y direction of the laser light L emitted from the light emitting element 32 and passing through the lenses 41A and 42A increases as it travels in the X1 direction. The laser light L, which is tapered and expanding in the Y direction, enters the lens 43A via the lens 42A.

[0065] Lens 43A has a plane-symmetric shape with respect to a virtual center plane that intersects with and is perpendicular to the Y direction. Incident surface 43a and exit surface 43b of lens 43A have cylindrical surfaces that have generatrix along the Z direction and extend in the Z direction. Incident surface 43a is a plane perpendicular to the X1 direction. Also, exit surface 43b is a convex curved surface that is convex in the X1 direction.

[0066] Lens 43A collimates laser light L in the Y direction, i.e., in the slow axis. Lens 43A is a convex lens in a cross section perpendicular to the Z direction. Lens 43A may also be referred to as a collimating lens.

[0067] [Shielding part] As shown in Fig. 1, when the laser beams travel in the directions opposite to each other in the subunit 100a1 of the array A1 and the subunit 100a2 of the array A2, stray light (leakage light) of the laser beam traveling in the subunit 100a of one of the arrays A1 and A2 in a direction approaching the other array may interfere with the laser beam in the subunit 100a of the other array. In addition, when the lenses 41A to 43A are bonded to the base 101 via a bonding material (not shown), the bonding material may be damaged if stray light is irradiated to the bonding material. The stray light is derived from, for example, the laser beam deviated from the predetermined optical path by being unintentionally reflected or transmitted by each optical component.

[0068] Therefore, in this embodiment, a shielding portion 101d1 for blocking stray light is provided between the array A1 and the array A2. The shielding portion 101d1 blocks stray light in the X1 direction from the lenses 41A-43A and the mirror 103 of the subunit 100a1 to the lenses 41A-43A and the mirror 103 of the subunit 100a2, and reflects the stray light in a direction deviating from the lenses 41A-43A and the mirror 103 of the subunit 100a1. The shielding portion 101d1 also blocks stray light in the X2 direction from the lenses 41A-43A and the mirror 103 of the subunit 100a2 to the lenses 41A-43A and the mirror 103 of the subunit 100a1, and reflects the stray light in a direction deviating from the lenses 41A-43A and the mirror 103 of the subunit 100a2. Lenses 41A-43A and mirror 103 included in subunit 100a1 are an example of a first optical component, and lenses 41A-43A and mirror 103 included in subunit 100a1 are an example of a first optical component. Furthermore, the X1 direction is an example of a first direction, and the X2 direction is an example of a direction opposite to the first direction.

[0069] 4 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, i.e., the height from the surface 101b, is set to a height sufficient to block 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 in the Z direction than the positions of the tops of the lenses 41A to 43A included in the subunit 100a in the Z direction.

[0070] The shielding portion 101d1 may be attached to the surface 101b of the base 101 via a bonding material such as an adhesive or solder, may be welded, may be attached via a fastener such as a screw, or may be integrally formed with the base 101. The adhesive may be an electromagnetic wave curing adhesive or a thermosetting adhesive, and is preferably an adhesive with a relatively high thermal conductivity.

[0071] In this embodiment, the shielding portion 101d1 has a reflecting surface 101da at each of the ends in the X1 direction and the X2 direction. These reflecting surfaces 101da are inclined with respect to the Z direction so that the reflected light Lsr does not return to (does not hit) optical components such as the mirror 103 and the lenses 41A to 43A, and is deflected to the opposite side of the surface 101b of the base 101 with respect to the optical components. The stray light Ls traveling in the X1 direction is reflected by the reflecting surface 101da at the end of the X2 direction of the shielding portion 101d1 in the X2 direction in a direction between the opposite direction of the X1 direction (X2 direction) and the Z direction. On the other hand, the stray light Ls traveling in the X2 direction is reflected by the reflecting surface 101da at the end of the X1 direction of the shielding portion 101d1 in the X1 direction in a direction between the opposite direction of the X2 direction (X1 direction) and the Z direction.

[0072] Furthermore, the reflecting surface 101da is coated with a paint, such as a black paint, that converts the energy of the laser light into heat energy. In this case, the reflecting surface 101da functions as an absorbing surface that absorbs the energy of the laser light. The reflecting surface 101da is an example of an absorbing surface. With this configuration, the intensity of the reflected light on the reflecting surface 101da can be further reduced, thereby preventing or reducing adverse effects of the reflected light on other parts.

[0073] Further, the base 101 is provided with a refrigerant passage 109 through which the refrigerant C flows, so as to overlap with the shielding portion 101d1 in the Z direction. The refrigerant passage 109 is provided such that a portion of the section between the inlet 109a and the outlet 109b of the refrigerant passage 109 passes through a position that overlaps with the shielding portion 101d1 in the Z direction. In this section, the refrigerant passage 109 extends, for example, in the Y direction along the shielding portion 101d1.

[0074] The shielding portion 101d1 and the base 101 are made of a material with high thermal conductivity, such as a copper-based material or an aluminum-based material, and the shielding portion 101d1, the inner surface of the coolant passage 109, and the coolant C are thermally connected via the base 101. Therefore, according to this embodiment, heat exchange occurs between the coolant C and the shielding portion 101d1 via the base 101, the shielding portion 101d1 in which heat is generated based on the energy of the stray light Ls is cooled, and it is possible to suppress an increase in temperature of the shielding portion 101d1 and the surroundings of the shielding portion 101d1.

[0075] [Reflection surface angle] 5 is a side view seen in the Y direction showing the shielding portion 101d1 corresponding to the subunit 100a1 of the array A1 and the optical component 40. The optical component 40 is an optical component included in the subunit 100a1 of the array A1, and is any one of the lenses 41A to 43A and the mirror 103.

[0076] 5, the end of the reflected light Lsr on the reflecting surface 101da of the shielding portion 101d1 with respect to the stray light Ls traveling in the X1 direction from the array A1 on the surface 101b side exactly overlaps with the end in the Z direction of the end face 40a in the X1 direction of the optical component 40 at point Pe. Therefore, if the reflected light Lsr is positioned on the opposite side of the surface 101b with respect to the optical component 40 from the state in FIG. 5, the reflected light Lsr will not hit the optical component 40.

[0077] In FIG. 5, the angle of incidence of the stray light Ls traveling in the X1 direction with respect to the reflecting surface 101da is α. The reflected light Lsr travels in the Dr direction between the X2 direction and the Z direction, and the elevation angle of the Dr direction with respect to the X2 direction is 2α. The beam width (diameter) of the stray light Ls and the reflected light Lsr is Wb. The point on the optical axis Axl of the stray light Ls aligned with the point Pe in the Z direction is Pa, and the point on the optical axis Axl of the reflected light Lsr aligned with the point Pe in the Z direction is Pc. The distance between the points Pa and Pb in the X1 direction is Xd, the distance between the points Pa and Pe in the Z direction is Zd, the distance between the points Pa and Pc in the Z direction is Zv, and the distance between the points Pe and Pc is Zi. The N direction is the normal direction of the reflecting surface 101da at the point Pb. The beam width is, for example, 1 / e of the peak intensity. 2 The width of the region where the intensity is equal to or greater than a predetermined ratio to the peak intensity can be used. Here, the predetermined ratio is, for example, a value between 0.1% and 1%. In addition, the beam width Wb when the laser light from the light-emitting element is collimated by a collimating lens can be calculated from the formula Wb=2×f×NA based on the focal length f of the collimating lens and the numerical aperture NA of the collimating lens.

[0078] In this case, the triangle connecting points Pa, Pb, and Pc is a right-angled triangle, so Zv = Xd tan(2α). Also, Zd = Zv-Zi, and Zi = 0.5Wb / cos(2α). Therefore, in the state of Figure 5, Zd=Zv-Zi=Xd·tan(2α)-0.5Wb / cos(2α) This holds true. Therefore, in order for the reflected light Lsr to be positioned on the opposite side of the optical component 40 from the surface 101b compared to the state in FIG. 5, the following formula (1) should be satisfied. Xd·tan(2α)-0.5·Wb / cos(2α)>Zd···(1) In the case of FIG. 5, the X1 direction is an example of a third direction, the Z direction is an example of a fourth direction, and the Dr direction is an example of a fifth direction. Also, the point Pe is an example of an end point, and the point Pb is an example of a reflection point. The subunit 100a2 of the array A2 has a configuration that is a mirror image of the configuration of FIG. 5. Therefore, if the condition of formula (1) is satisfied for the subunit 100a2 as well, interference between the reflected light Lsr and the optical component 40 can be avoided. However, for the subunit 100a2, the X1 direction is an example of a third direction, the X2 direction is an example of a direction opposite to the third direction, and the Z direction is an example of a fourth direction.

[0079] As described above, in this embodiment, the shielding portion 101d1 blocks stray light in the X1 direction from the lenses 41A-43A and mirror 103 (first optical component) as the optical component 40 of the subunit 100a1 toward the lenses 41A-43A and mirror 103 (second optical component) as the optical component 40 of the subunit 100a2, and reflects the stray light in a direction deviating from the optical component 40 (first optical component) of the subunit 100a1. Also, the shielding portion 101d1 blocks stray light in the X2 direction from the lenses 41A-43A and mirror 103 of the subunit 100a2 toward the lenses 41A-43A and mirror 103 of the subunit 100a1, and reflects the stray light in a direction deviating from the optical component 40 of the subunit 100a2.

[0080] With such a configuration, for example, it is possible to prevent stray light from the first optical component from interfering with the laser light transmitted by the second optical component, and to prevent the occurrence of undesirable phenomena such as damage to the bonding material of the first optical component or the second optical component due to the stray light.

[0081] Furthermore, as in this embodiment, the shielding portion 101d1 may reflect stray light in a direction away from the base 101. If the stray light is reflected in a direction approaching the base 101, there is a risk that an undesirable event will occur due to secondary reflected light of the reflected light at the base 101. In this regard, if the shielding portion 101d1 reflects stray light in a direction away from the base 101 as in this embodiment, for example, it is easy to avoid undesirable events due to secondary reflected light at the base 101.

[0082] In addition, as in the present embodiment, the shielding portion 101d1 may reflect and absorb stray light. With such a configuration, for example, the intensity of the reflected light of the stray light can be weakened at the shielding portion 101d1, and thus inconveniences caused by the reflected light can be further suppressed.

[0083] Furthermore, as in this embodiment, the shielding portion 101d1 may be located between the subunits 100a1 and 100a2. With this configuration, for example, the shielding portion 101d1 can be shared between the subunits 100a1 and 100a2, which has the advantage that the number of parts can be reduced, the effort and cost required to manufacture the optical device 100A can be reduced, and the optical device 100A can be made more compact, compared to a configuration in which the shielding portion 101d1 is provided for each of the subunits 100a1 and 100a2.

[0084] [Second embodiment] Fig. 6 is a plan view of a subunit 100a1 (100a) included in an optical device 100B (100) of the second embodiment. Except for the fact that the subunit 100a shown in Fig. 6 is provided instead of the subunit 100a shown in Fig. 1, the optical device 100B has a similar configuration to the optical device 100A of the first embodiment. Note that Fig. 6 shows the subunit 100a1 of the array A1, but the subunit 100a2 of the array A2 also has a similar configuration to Fig. 6, that is, a configuration that is a mirror image of the configuration in Fig. 6.

[0085] 6, the lens 41A is joined to the light emitting module 10A via a joint 50. Furthermore, the lens 42A is joined to the post 101c via a joint 50. The light emitting module 10A and the post 101c are an example of a protrusion that protrudes in the Z direction from the surface 101b of the base 101. Furthermore, the joint 50 is an example of a bonding material.

[0086] The post 101c may be attached to the surface 101b of the base 101 via a bonding material such as an adhesive or solder, may be welded, may be attached via a fastener such as a screw, or may be integral with the base 101. The adhesive for the post 101c may be an electromagnetic wave curing adhesive or a thermosetting adhesive. Although the post 101c is provided on both sides of the lens 42A in the Y direction, it may be provided on only one side.

[0087] The bonding portion 50 is, for example, an adhesive made of a synthetic resin material, or may be an electromagnetic wave curing adhesive or a thermosetting adhesive.

[0088] In this embodiment, a shielding portion 101d2 that blocks stray light Ls toward the joint 50 is provided at a position away from the joint 50 in the X1 direction. With this configuration, it is possible to prevent the joint 50 included in the subunit 100a of one of the arrays A1 and A2 from being irradiated with stray light Ls from the subunit 100a of the other array of the arrays A1 and A2, thereby damaging the joint 50. According to this embodiment, for example, it is advantageous that the shielding portion 101d2 can be realized with a relatively compact configuration. In addition, when the optical device 100B further includes the shielding portion 101d1 of the first embodiment, for example, it is advantageous that the inconvenience caused by the stray light Ls can be more reliably avoided. In addition, when the optical device 100B does not include the shielding portion 101d1 of the first embodiment, for example, it is advantageous that the optical device 100B can be configured to be lighter.

[0089] FIG. 7 is a side view of the shielding portion 101d2. As shown in FIG. 7, in this embodiment, the shielding portion 101d2 has a reflecting surface 101da similar to that of the first embodiment. The reflection direction of the stray light Ls by the reflecting surface 101da is the same as that of the first embodiment. This makes it easier to avoid inconveniences caused by the reflected light Lsr from the reflecting surface 101da. Note that the shielding portion 101d2 may function as an absorbing portion, similar to the first embodiment.

[0090] In the optical device 100B of the second embodiment, the shielding portion 101d2 provides the same effect as the optical device 100A of the first embodiment.

[0091] [Third embodiment] 8 is a plan view of an optical device 100C (100) of the third embodiment. The optical device 100C has a similar configuration to the optical device 100A of the first embodiment, except that a plurality of shielding portions 101d3 shown in FIG. 8 are provided instead of the shielding portion 101d1 shown in FIG. 8. The shielding portions 101d3 are provided between the subunits 100a1 and 100a2. As in the first embodiment, each shielding portion 101d3 is thermally connected to the inner surface of the refrigerant passage 109 and the refrigerant via the base 101 in this embodiment.

[0092] Fig. 9 is an enlarged plan view of the shielding portion 101d3, the mirror 103, and the absorbing portion 101e of the optical device 100C shown in Fig. 8. As shown in Fig. 9, like the first embodiment, the shielding portion 101d3 can also block the stray light Ls from the subunit 100a1 to the subunit 100a2, and can also block the stray light Ls from the subunit 100a2 to the subunit 100a1.

[0093] The shielding portion 101d3 has two reflecting surfaces 101da. The reflecting surface 101da1 (101da) located at the end in the X2 direction corresponding to the subunit 100a1 and facing the subunit 100a1 reflects the stray light Ls from the subunit 100a1 in the Y direction. The reflecting surface 101da2 (101da) located at the end in the X1 direction corresponding to the subunit 100a2 and facing the subunit 100a2 reflects the stray light Ls from the subunit 100a2 in the Y direction. Here, as in the first embodiment, the position of each subunit 100a in the Z direction shifts in the opposite direction to the Z direction as it moves toward the Y direction, and the position of the end of each shielding portion 101d3 in the Z direction also shifts in the opposite direction to the Z direction as it moves toward the Y direction. Therefore, each reflected light Lsr can go beyond each shielding portion 101d3 in the Z direction and proceed in the Y direction. With this configuration, stray light Ls traveling in the X1 direction from each subunit 100a1 is reflected by the reflecting surface 101da1 and becomes reflected light Lsr arranged parallel to the Z direction and traveling in the Y direction. Also, stray light Ls traveling in the X2 direction from each subunit 100a2 is reflected by the reflecting surface 101da2 and becomes reflected light Lsr arranged parallel to the Z direction and traveling in the Y direction. The reflecting surface 101da1 is an example of a first shielding portion, and the reflecting surface 101da2 is an example of a second shielding portion. Also, 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.

[0094] The reflected light Lsr from the reflecting surface 101da1 and the reflecting surface 101da2 toward the Y direction is input to the end surface 101e1 of the absorbing portion 101e. The absorbing portion 101e protrudes from the surface 101b of the base 101 in the Z direction. The end surface 101e1 is coated with a paint, such as black paint, that converts the energy of the laser light into heat energy. In this case, the end surface 101e1 functions as an absorbing surface that absorbs the energy of the laser light. The end surface 101e1 may also be referred to as an absorbing surface. In addition, the end surface 101e1 is inclined with respect to the Z direction so that even if the reflected light Lsr that is not absorbed by the end surface 101e1 is reflected by the end surface 101e1, it does not return to the shielding portion 101d3 but moves away from the surface 101b of the base 101 and travels in a 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 smaller than 90° with respect to the direction opposite to the Y direction. Furthermore, the refrigerant passage 109 provided in the base 101 is provided so as to partially overlap with the absorption unit 101e in the Z direction, and the absorption unit 101e is thermally connected to the inner surface of the refrigerant passage 109 and the refrigerant via the base 101.

[0095] According to this embodiment, the absorbing unit 101e corresponding to the reflected light Lsr has an advantage that the reflected light Lsr, i.e., the stray light Ls, can be more reliably processed. In addition, according to this embodiment, since the reflected light Lsr can be collectively processed in the absorbing unit 101e, the number of parts can be reduced and the configuration of the optical device 100C can be simplified, as compared with the case where the absorbing units for processing the reflected light Lsr are provided at multiple locations. The absorbing unit 101e may be provided corresponding to each of the arrays A1 and A2.

[0096] Furthermore, the optical device 100C of this embodiment includes a shielding portion 101d2 corresponding to the combiner 108a, as shown in FIG. 8. The shielding portion 101d2 protrudes in the Z direction from the surface 101b of the base 101, and can block stray light Ls that is not reflected in the Y direction and travels in the X1 direction among the laser light L1 input to the combiner 108a in the X1 direction, and stray light Ls that is reflected in the X1 direction among the laser light L2 input to the combiner 108a in the Y direction and travels in the X1 direction without being transmitted in the Y direction. The shielding portion 101d2 also has a reflecting surface 101da that reflects the stray light Ls from the combiner 108a in a direction that deviates from optical components such as the combiner 108a, the 1 / 2 wavelength plate 108c, and the mirror 108b and in a direction away from the surface 101b of the base 101. Furthermore, the reflecting surface 101da is coated with paint that converts the energy of the laser light into thermal energy, such as black paint. In this case, the reflecting surface 101da functions as an absorbing surface that absorbs the energy of the stray light Ls. The reflecting surface 101da is an example of an absorbing surface. The coolant passage 109 provided in the base 101 is provided so as to partially overlap with the shielding portion 101d2 in the Z direction, and the shielding portion 101d2, the inner surface of the coolant passage 109, and the coolant are thermally connected via the base 101. In this way, the shielding portion 101d2 can process the stray light Ls from a specific optical element, and can prevent or reduce adverse effects of the stray light Ls on other parts. The combiner 108a is an example of an optical element. The laser light L1 input from the array A1 to the combiner 108a is an example of a first laser light, the X1 direction is an example of a sixth direction, and the Y direction is an example of a seventh direction. The laser light L2 input from the array A2 to the combiner 108a is an example of a second laser light.

[0097] In the optical device 100C of the third embodiment, the shielding portions 101d3 and 101d2 provide the same effects as those of the optical device 100A of the first embodiment.

[0098] [Fourth embodiment] 10 is a plan view of an optical device 100D (100) according to a fourth embodiment. The optical device 100D has a similar configuration to the optical device 100A (100) according to the first embodiment, except that the configuration of the optical components of the subunit 100a is different.

[0099] In this embodiment, the subunit 100a includes a light emitting module 10E, a lens 42B, a lens 43B, and a mirror 103. The light emitting module 10E does not include a case 20, but includes a chip-on submount 30. The chip-on submount 30 is exposed in the accommodation chamber of the optical device 100D. The lens 42B collimates the laser light from the light emitting element 32 in the Z direction, i.e., in the fast axis. The lens 43B collimates the laser light from the lens 42B in the Y direction, i.e., in the slow axis.

[0100] In the optical device 100D of the fourth embodiment, the shielding portion 101d1 provides the same effect as the optical device 100A of the first embodiment.

[0101] [Fifth embodiment] 11 is a plan view of an optical device 100E (100) of the fifth embodiment. The optical device 100E has a similar configuration to the optical device 100D of the fourth embodiment, except that the light-emitting elements 32 output laser beams of different wavelengths (λ1, λ2, . . . , λn-1, λn) and the optical device 100E does not have a half-wave plate 108c. The interval between the multiple wavelengths is, for example, 5 [nm] to 20 [nm] between the center wavelengths. The light synthesized here may also include a blue laser beam.

[0102] In the optical device 100E of the fifth embodiment, the shielding portion 101d1 provides the same effects as those of the optical device 100A of the first embodiment.

[0103] [Sixth embodiment] 12 is a plan view of an optical device 100F (100) of a sixth embodiment. The optical device 100F includes a plurality of optical fibers 107A that input laser light from the outside, and does not include a light emitting module. The plurality of optical fibers 107A input laser light of different wavelengths. The optical fibers 107A are each supported by a fiber support portion 106a. The optical device 100F may also be called a light combining device.

[0104] The optical device 100F includes a lens 44, a mirror 103, a wavelength filter 108d, and a lens 45. Laser light from a plurality of optical fibers 107A is transmitted to an end (not shown) of the optical fiber 107 via the lens 44, the mirror 103, the wavelength filter 108d, and the lens 45, and is optically coupled to the optical fiber 107. The lens 44, the mirror 103, the wavelength filter 108d, and the lens 45 are examples of optical components.

[0105] The mirror 103 reflects the laser light traveling in the X2 direction in the Y direction. Furthermore, the lens 44 is, for example, a collimator lens, and the lens 45 is, for example, a condenser lens.

[0106] The wavelength filter 108d mainly reflects the laser light L1 traveling in the X2 direction and transmits the laser light L2 traveling in the Y direction. Here, the X2 direction, the Y direction, and the attitude of the wavelength filter 108d are set so that both the reflected laser light and the transmitted laser light travel in the Y direction. That is, the laser light (main light) output from the wavelength filter 108d and traveling in the Y direction includes the reflected light of the laser light L1 and the transmitted light of the laser light L2. The wavelength filter 108d is an example of an optical element. The laser light L1 is an example of a first laser light, the X2 direction is an example of a sixth direction, and the Y direction is an example of a seventh direction. Also, the laser light L2 is an example of a second laser light.

[0107] The laser light L1 and the laser light L2 have, for example, different wavelengths. As an example, when the wavelength of the laser light L1 is longer than the wavelength of the laser light L2, the wavelength filter 108d is, for example, a low-pass filter.

[0108] Furthermore, the wavelength of the laser light L1 may be shorter than the wavelength of the laser light L2. In this case, the wavelength filter 108d is, for example, a high-pass filter.

[0109] In the wavelength filter 108d, it is difficult to obtain 100% reflection and transmission characteristics, and in reality, transmitted laser light of the laser light L1 and reflected laser light of the laser light L2 are generated, which become stray light Ls from the wavelength filter 108d. The stray light Ls travels from the wavelength filter 108d in the X2 direction.

[0110] Therefore, the optical device 100F includes a shielding portion 101d2 that blocks and reflects stray light from the wavelength filter 108d. The shielding portion 101d2 has a similar configuration to the shielding portion 101d2 provided in the optical device 100C of the third embodiment. Therefore, in this embodiment, the shielding portion 101d2 provides the same effect as the optical device 100C of the third embodiment.

[0111] [Seventh embodiment] [Light source device, optical fiber laser configuration] FIG. 13 is a configuration diagram of a light source device 110 of a seventh embodiment in which the optical device 100 (light emitting device) of any one of the first to fifth embodiments is mounted. The light source device 110 includes a plurality of optical devices 100 as excitation light sources. Laser light output from the plurality of optical devices 100 is transmitted to a combiner 90 as an optical coupling unit via an optical fiber 107. The output ends of the optical fibers 107 are respectively coupled to a plurality of input ports of the combiner 90 with a plurality of inputs and one output. The light source device 110 is not limited to one including a plurality of optical devices 100, but may include at least one optical device 100. The combiner 90 may be configured similarly to the optical device 100F of the sixth embodiment, and may include a shielding portion 101d2.

[0112] [Eighth embodiment] Fig. 14 is a configuration diagram of an optical fiber laser 200 in which the light source device 110 of Fig. 13 is mounted. The optical fiber laser 200 includes the light source device 110 and combiner 90 shown in Fig. 13, a rare-earth doped optical fiber 130, and an output-side optical fiber 140. Highly reflective FBGs 120 and 121 (fiber brag gratings) are provided at the input end and output end of the rare-earth doped optical fiber 130, respectively.

[0113] An input end of the rare-earth doped optical fiber 130 is connected to an output end of the combiner 90, and an input end of the output side optical fiber 140 is connected to an output end of the rare-earth doped optical fiber 130. Note that the input section for inputting the laser light output from the plurality of optical devices 100 to the rare-earth doped optical fiber 130 may have another configuration instead of the combiner 90. For example, the optical fibers 107 of the output sections of the plurality of optical devices 100 may be arranged side by side, and the laser light output from the plurality of optical fibers 107 may be input to the input end of the rare-earth doped optical fiber 130 using an input section such as an optical system including a lens. The rare-earth doped optical fiber 130 is an example of an optical amplifying fiber.

[0114] According to the light source device 110 of the seventh embodiment or the optical fiber laser 200 of the eighth embodiment, by including the optical device 100 of the first to sixth embodiments, the same effects as those of the first to sixth embodiments can be obtained.

[0115] Although the embodiment of the present invention has been illustrated above, the above embodiment is merely an example and is not intended to limit the scope of the invention. The above embodiment can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the gist of the invention. In addition, the specifications of each configuration, shape, and the like (structure, type, direction, model, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented.

[0116] For example, the optical components are not limited to those disclosed in the embodiments, and may be other optical elements that reflect, refract, or diffract light, such as a prism or a diffractive optical element. The diffractive optical element is, for example, a combination of multiple diffraction gratings with different periods.

[0117] In addition, the configurations, arrangements, and combinations of the subunits, the light emitting modules, the optical components, the protrusions, the shielding parts, etc. are not limited to those in the above-described embodiment. In addition, the traveling direction of the stray light is not limited to the above-described direction.

[0118] In the above embodiment, the reflecting surface 101da of the shielding portion 101d1, 101d2 has a planar shape as shown in Fig. 4 and 7, but is not limited thereto, and the reflecting surface 101da may have a convex curved shape as shown in Fig. 15. In the modified example of Fig. 15, the reflecting surface 101da has a curved shape only in the portion where the stray light Ls hits, but is not limited thereto, and the reflecting surface 101da may have a curved shape overall. The reflecting surface may also have a concave curved shape. [Explanation of symbols]

[0119] 10A…Light emitting module (protruding part) 10E…Light emitting module 20…Case 21...Wall components 21a...base 21b...Opening 22...Window material 30…Chip-on-submount 31…Submount 31a…Metallized layer 32...Light emitting element 40...Optical components 40a...end face 41A...Lens (optical component, first optical component, second optical component) 41a...Incidence surface 41b...Emission surface 42A, 42B...Lens (optical component, first optical component, second optical component) 42a...Incidence surface 42b...Emission surface 43A, 43B...Lens (optical component, first optical component, second optical component) 43a...Incidence surface 43b...Emission surface 44,45…Lens 50…Joint part (joint material) 90…Combiner 100,100A~100F…Optical device 100a…Subunit 100a1...Subunit (first subunit) 100a2...Subunit (second subunit) 101...Bass 101b…Surface 101c…Post (protruding part) 101d1,101d2,101d3…shielding part 101da…Reflective surface (absorbent surface) 101da1...Reflecting surface (first shielding part) 101da2…Reflection surface (second shielding part) 101e…Absorption section 101e1...End face 103...Mirror (optical component, first optical component, second optical component) 104, 105...Condenser lens (optical component) 106a...fiber support part 107...Optical fiber 107A...Optical fiber 108…Photosynthesis division 108a...Combiner (optical component, optical element) 108b...Mirror (optical component) 108c...1 / 2 wave plate (optical component) 108d...Wavelength filter (optical component, optical element) 109…Refrigerant passage 109a...Entrance 109b…Exit 110...Light source device 120,121…High reflective FBR 130...Rare earth doped optical fiber 140...Output optical fiber 200...Optical fiber laser Ax…center axis Axl…Optical axis A1, A2…Array C...refrigerant Dr… direction (fifth direction) L: Laser light L1...Laser light (first laser light) L2...Laser light (second laser light) Ls…Stray light Lsr…Reflected light N...Direction (normal direction) Pa,Pc…points Pb…point (reflection point) Pcz…Focus point Pe…point (end point) Vc2: Virtual center plane Wb…Beam width Wza: Beam width (in Z direction) Wzc: (collimated) beam width in Z direction X…direction Xd…distance X1...direction (first direction, third direction, sixth direction) X2...Direction (opposite direction of the first direction, opposite direction of the third direction, sixth direction) Y…direction (second direction, seventh direction) Z…direction (fourth direction) Zd…distance α…Incidence angle

Claims

1. With the base, a light emitting element provided on the base and emitting a laser beam; a plurality of optical components provided on the base for guiding the laser light output from the light emitting element to an optical fiber and coupling the laser light to the optical fiber; a shielding portion provided on the base, which blocks stray light that deviates from a predetermined optical path in a first optical component as the optical component and travels toward a second optical component as the optical component, and reflects the stray light in a direction away from an end portion of the first optical component farthest from the base and deviating from the end portion; An optical device comprising:

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

3. the first optical component is fixed to the base via a bonding material; The optical device according to claim 1 , wherein the shielding portion blocks the 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 protruding from a surface of the base via the bonding material.

5. a first subunit including at least one of the optical components for transmitting laser light in a first direction; a second subunit including at least one of the optical components that transmits laser light in a direction opposite to the first direction; Equipped with The optical device according to any one of claims 1 to 4, wherein the shielding portion blocks and reflects at least one of the stray light traveling in the first direction from the first subunit and the stray light traveling in the opposite direction to the first direction from the second subunit.

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

7. The optical device according to claim 5 or 6, wherein the shielding portion is located between the first subunit and the second subunit.

8. a plurality of first subunits each including at least one of the optical components for transmitting laser light in a first direction; a plurality of shielding portions as the shielding portion, each of which is provided corresponding to each of the first subunits and blocks the stray light traveling in the first direction and reflects the stray light in a second direction; an absorbing section that receives and absorbs the stray light reflected by the plurality of shielding sections; The optical device according to any one of claims 1 to 7, comprising:

9. a plurality of first subunits each including at least one of the optical components for transmitting laser light in a first direction; a plurality of first shielding portions as a plurality of shielding portions provided corresponding to the first subunits, each of which blocks the stray light traveling in the first direction and reflects the stray light in a second direction; a plurality of second subunits each including at least one of the optical components that transmits laser light in a direction opposite to the first direction; a plurality of second shielding portions provided corresponding to the second subunits, each of which blocks the stray light traveling in a direction opposite to the first direction and reflects the stray light in the second direction; an absorbing portion that receives and absorbs the stray light from the plurality of first shielding portions and the plurality of second shielding portions; The optical device according to any one of claims 1 to 8, comprising:

10. the shielding portion has a reflecting surface that reflects the stray light traveling in a third direction in a fifth direction between a direction opposite to the third direction and a fourth direction perpendicular to the third direction, In a configuration in which the optical component is spaced apart from the reflecting surface in a direction opposite to the third direction, protrudes from a surface of the base in the fourth direction, and has an end point that is an end of an end surface in the third direction in the fourth direction, The distance in the third direction between the end point and a reflection point which is the position of the optical axis of the stray light on the reflection surface is Xd, The distance between the optical axis and the end point in the fourth direction is Zd. The angle of incidence of the stray light with respect to the reflecting surface is α, When the beam width of the stray light is Wb, The following formula (1) Xd・tan(2α)-0.5・Wb / cos(2α)>Zd...(1) The optical device according to any one of claims 1 to 9,

11. The base is provided with a cooling passage through which a coolant passes, 11. The optical device according to claim 1, wherein the shielding portion is thermally connected to the coolant via the base.

12. A base, a plurality of optical components provided on the base for guiding laser light to an optical fiber and coupling the laser light to the optical fiber; a shielding portion provided on the base, which blocks stray light that deviates from a predetermined optical path in a first optical component included in the plurality of optical components, and reflects the stray light in a direction away from an end portion of the first optical component farthest from the base and deviating from the end portion; An optical device comprising:

13. a base having a surface on which the plurality of optical components are provided; The optical device of claim 12 , wherein the blocking portion protrudes from the surface and reflects the stray light away from the surface.

14. the optical component includes an optical element that reflects a first laser beam traveling in a sixth direction in a seventh direction and transmits a second laser beam traveling in the seventh direction; the stray light from the optical element includes at least one of stray light of the first laser light that is not reflected by the optical element and travels from the optical element in the sixth direction, and stray light of the second laser light that is not transmitted by the optical element and travels from the optical element in the sixth direction, The optical device according to claim 1 , wherein the shielding portion is positioned away from the optical element in the sixth direction.

15. A light source device comprising the optical device according to any one of claims 1 to 14.

16. The light source device according to claim 15 ; an optical amplifying fiber for amplifying the laser light emitted from the light source device; An optical fiber laser comprising:

Images