Optical device

Abstract

To provide such an improved new optical device having less inconvenience, for example, as to able to suppress a temperature rise in a processing part of leakage light.SOLUTION: An optical device comprises, for example: at least one optical component that reflects first light heading in a first direction to a second direction and also transmits second light heading in a second direction, and causes leakage light which, including a component transmitted toward the first direction in the first light and a component reflected toward the first direction in the second light, heads in the first direction; a first processing part that absorbs and reflects to a predetermined direction the leakage light; and at least one second processing part that absorbs leakage light from the first processing part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an optical device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, optical devices equipped with a processing section for processing leakage light (stray light), which is unnecessary light, are known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 134911 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in an optical device having a high power laser light, the power of the leaked light received by the leaked light processing section also increases, which may result in an increase in the temperature of the leaked light processing section.

[0005] Therefore, one of the objects of the present invention is to obtain a new and improved optical device that has fewer inconveniences, for example, in an optical device capable of processing leakage light, and that can suppress the rise in temperature in the processing section of the leakage light. [Means for solving the problem]

[0006] The optical device of the present invention, for example, includes at least one optical component that reflects a first light traveling in a first direction in a second direction and transmits a second light traveling in the second direction, and generates leaked light traveling in the first direction including a component of the first light that is transmitted in the first direction and a component of the second light that is reflected in the first direction, a first processing unit that absorbs the leaked light and reflects it in a predetermined direction, and at least one second processing unit that absorbs the leaked light from the first processing unit.

[0007] In the optical device, a reflectance of the leaked light in the second processing section may be lower than a reflectance of the leaked light in the first processing section.

[0008] The optical device may include, as the first processing section, a plurality of first processing sections arranged in series in an optical path of the leaked light.

[0009] In the optical device, the reflectance of the leaked light at a first processing unit, one of two first processing units included in the plurality of first processing units, that is located in front of the optical path of the leaked light in the traveling direction, may be lower than the reflectance of the leaked light at a first processing unit, one of the two first processing units, that is located behind the optical path of the leaked light in the traveling direction.

[0010] The optical device may further include a heat transfer section that transfers heat generated by absorption of the leaked light in the first processing section or the second processing section to a heat dissipation section.

[0011] The optical device may include a cooling mechanism that cools at least one of the first processing section and the second processing section.

[0012] The optical device may include a plurality of optical components as the optical components, and a plurality of first processing sections as the first processing sections, into which the leaked light is incident from each of the optical components which are different from one another, and the leaked light from the plurality of first processing sections may be incident on at least one of the second processing sections.

[0013] In the optical device, the first light and the second light may have different wavelengths.

[0014] In the optical device, the first light and the second light may have different planes of polarization.

[0015] In the optical device, the first light and the second light may be emitted from different light sources.

[0016] Moreover, the optical device of the present invention includes, for example, a first processing section that absorbs leakage light from an optical component in a first direction and reflects the leakage light in a third direction, and a second processing section that is positioned away from the first processing section in the third direction and absorbs the leakage light reflected by the first processing section. Effect of the Invention

[0017] According to the present invention, it is possible to obtain a novel and improved optical device with fewer inconveniences, for example, capable of suppressing an increase in temperature in a processing section for leaking light. [Brief description of the drawings]

[0018] [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 plan view of the optical device according to the second embodiment. [Diagram 3] FIG. 3 is an illustrative schematic plan view of the optical device according to the third embodiment. [Figure 4] FIG. 4 is an illustrative schematic plan view of the optical device according to the fourth embodiment. [Diagram 5] FIG. 5 is an illustrative schematic plan view of the optical device according to the fifth embodiment. [Figure 6] FIG. 6 is an exemplary schematic side view (partial cross-sectional view) of a portion of the optical device according to the fifth embodiment. [Figure 7] FIG. 7 is an illustrative schematic plan view of the optical device according to the sixth embodiment. [Figure 8] FIG. 8 is an illustrative schematic plan view of the optical device according to the seventh embodiment. [Figure 9] FIG. 9 is an illustrative schematic cross-sectional view of a second processing section and a heat transfer section included in the optical device of the eighth embodiment. [Figure 10] FIG. 10 is an illustrative schematic cross-sectional view of a second processing section and a heat transfer section included in the optical device of the ninth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Exemplary embodiments of the present invention are disclosed below. The configurations of the embodiments shown below, and 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. 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.

[0020] The embodiments described below have similar configurations. Therefore, according to the configurations of the respective embodiments, similar actions and effects based on the similar configurations can be obtained. In addition, in the following, the similar configurations are given the same reference numerals, and duplicated descriptions may be omitted.

[0021] In this specification, ordinal numbers are given for the sake of convenience to distinguish between parts, portions, lights, directions, etc., and do not indicate priority or order.

[0022] In each drawing, the X direction is represented by an arrow X, the Y direction is represented by an arrow Y, and the Z direction is represented by an arrow Z. The X direction, Y direction, and Z direction intersect with each other and are perpendicular to each other.

[0023] [First embodiment] 1 is a plan view of an optical device 100 according to a first embodiment. As shown in FIG. 1, the optical device 100 includes a wavelength filter 111, a first processing unit 112, a second processing unit 113, and a heat transfer unit 114.

[0024] The wavelength filter 111 mainly reflects the light L1 traveling in the D1 direction and transmits the light L2 traveling in the D2 direction. The angle of incidence of the light L1 on the reflecting surface 111a is equal to the angle of reflection of the reflected light L1r. The D1 direction, the D2 direction, and the attitude of the wavelength filter 111 are set so that the reflected light L1r and the transmitted light L2t travel in the D2 direction. In this configuration, the main light Lm from the wavelength filter 111 includes the reflected light L1r of the light L1 and the transmitted light L2t of the light L2. The light L1 is an example of the first light, and the light L2 is an example of the second light. The D1 direction is an example of the first direction, and the D2 direction is an example of the second direction. The wavelength filter 111 is also an example of an optical component.

[0025] The light L1 and the light L2 have, for example, different wavelengths. As an example, when the wavelength of the light L1 is longer than the wavelength of the light L2, the wavelength filter 111 is, for example, a short-pass filter.

[0026] Furthermore, the wavelength of the light L1 may be shorter than the wavelength of the light L2. In this case, the wavelength filter 111 is, for example, a long-pass filter.

[0027] It is difficult to obtain 100% reflection and transmission characteristics in the wavelength filter 111, and in reality, transmitted light L1t of the light L1 and reflected light L2r of the light L2 are generated, which become leaked light Ll1 (Ll) from the wavelength filter 111. In the above-mentioned configuration, both the transmitted light L1t and the reflected light L2r travel from the wavelength filter 111 in the D1 direction. That is, the leaked light Ll1 from the wavelength filter 111 travels in the D1 direction.

[0028] In the optical device 100, a first processing unit 112 and a second processing unit 113, which are provided in multiple stages, process the leaked light Ll from the wavelength filter 111. The first processing unit 112 is a processing unit at a front stage, and absorbs and reflects the leaked light Ll1. The second processing unit 113 is a processing unit at a rear stage (final stage) of the first processing unit 112, and absorbs the leaked light Ll2 (Ll). The first processing unit 112 and the second processing unit 113 each convert the energy of the leaked light Ll into thermal energy.

[0029] The first processing unit 112 reflects the leaked light Ll in a predetermined direction toward the second processing unit 113 without scattering it. The reflection of the leaked light Ll in the first processing unit 112 is not diffuse reflection but specular reflection. This allows, for example, the second processing unit 113 to be disposed at a convenient position in the optical device 100, for example, at a position that does not interfere with other components in the optical device 100 or at a position that is unlikely to cause thermal effects on other components. In addition, if the first processing unit 112 scatters the leaked light Ll, the scattered leaked light Ll may travel in an unexpected direction, causing damage to an adhesive that fixes optical components, or other undesirable events. In this regard, according to the present embodiment, the leaked light Ll is reflected in a predetermined direction and can be more reliably processed by the first processing unit 112 and the second processing unit 113, making it easier to avoid undesirable events caused by the leaked light Ll.

[0030] In the present embodiment, as an example, in the first processing unit 112, the incident angle of the leaked light Ll1 incident on the reflecting surface 112a is the same as the reflection angle of the leaked light Ll2 reflected by the reflecting surface 112a. In the present embodiment, as an example, the leaked light Ll2 travels in a direction D2. The direction D2 is an example of the third direction and the predetermined direction.

[0031] The second processing section 113 is positioned away from the first processing section 112 in the direction in which the leaked light Ll2 travels, in the present embodiment in the direction D2, and absorbs the leaked light Ll2 from the first processing section 112. The second processing section 113 absorbs most of the leaked light Ll2, but may scatter or reflect a portion of it.

[0032] In this embodiment, most of the energy of the leaked light Ll is not absorbed in the first processing section 112, but by providing the first processing section 112 and the second processing section 113, the positions at which the energy of the leaked light Ll is absorbed are dispersed within the optical device 100. This makes it possible to suppress a local increase in the temperature of the optical device 100.

[0033] Due to the dispersion of energy absorption points of the leaked light Ll in the optical device 100, the reflectance of the leaked light Ll in the second processing section 113 is set to be lower than the reflectance of the leaked light Ll in the first processing section 112. Here, the reflectance of the leaked light Ll in the second processing section 113 is the ratio of the power of the leaked light (not shown) reflected by the second processing section 113 to the power of the leaked light Ll2 input to the second processing section 113, and the reflectance of the leaked light Ll in the first processing section 112 is the ratio of the power of the leaked light reflected by the first processing section 112 to the power of the leaked light Ll1 input to the first processing section 112. In addition, both the first processing section 112 and the second processing section 113 are assumed not to transmit the leaked light Ll.

[0034] As an example, the reflectance of the leaked light Ll in the first processing unit 112 is set to approximately 50% (approximately 1 / 2), and the reflectance of the leaked light Ll in the second processing unit 113 is set to approximately 0%. In this case, approximately 50% of the energy of the leaked light Ll1 from the wavelength filter 111 is absorbed in the first processing unit 112, and approximately 50% of the energy of the leaked light Ll1 from the wavelength filter 111 is absorbed in the second processing unit 113. With such settings, the energy of the leaked light Ll can be absorbed in a substantially even distribution at multiple locations.

[0035] However, the setting of the reflectance of the first processing unit 112 and the second processing unit 113 is not limited to this. When one each of the first processing unit 112 and the second processing unit 113 is provided as in the present embodiment, from the viewpoint of dispersion of the energy absorption points, the reflectance of the first processing unit 112 is preferably set to 30% or more and 70% or less, and more preferably set to 40% or more and 60% or less.

[0036] The heat transfer unit 114 transfers heat generated in the first processing unit 112 or the second processing unit 113 to a heat dissipation unit such as a heat sink (not shown). The heat transfer unit 114 is made of a material with high thermal conductivity such as a metal material. The material with high thermal conductivity is, for example, a copper-based material such as oxygen-free copper or a copper alloy, or an aluminum-based material such as pure aluminum or an aluminum alloy. The heat transfer unit 114 is provided so as to protrude from the surface of the base of the optical device 100 (not shown). In this case, the heat transfer unit may be integral with the base, or may be formed by attaching a separate member onto the surface of the base.

[0037] Moreover, the first processing section 112 and the second processing section 113 may be layered portions provided on the side surface of the heat transfer section 114. As an example, the first processing section 112 may be configured as a nickel plating layer provided on the heat transfer section 114 made of a copper-based material, and the second processing section 113 may be configured as a black dye layer provided on the heat transfer section 114 made of a copper-based material. The black dye layer is made of, for example, a copper oxide coating.

[0038] As described above, according to this embodiment, in the optical device 100, the leaked light Ll can be processed by dispersing it at multiple locations, thereby preventing the occurrence of locally high temperature areas in the optical device 100.

[0039] [Second embodiment] 2 is a plan view of the optical device 100A of the second embodiment. As shown in FIG. 2, the optical device 100A includes a wavelength filter 111, first processing units 112-1 and 112-2, a second processing unit 113, and a heat transfer unit 114. This embodiment is different from the first embodiment in that multiple first processing units 112-1 and 112-2 are provided in front of the second processing unit 113. The first processing units 112-1 and 112-2 are arranged in series in the optical path of the leaked light Ll. Except for this point, the optical device 100A has the same configuration as the optical device 100 of the first embodiment.

[0040] The first processing unit 112-1 absorbs the leaked light Ll1 from the wavelength filter 111 and reflects it in the direction D2 toward the first processing unit 112-2 at the rear, i.e., the front of the optical path of the leaked light Ll. The first processing unit 112-2 is located away from the first processing unit 112-1 in the direction D2, absorbs the leaked light Ll2 from the first processing unit 112-1 at the rear of the optical path of the leaked light Ll, and reflects it in the direction D1 toward the second processing unit 113. The second processing unit 113 absorbs the leaked light Ll3 (Ll) reflected by the first processing unit 112-2. The first processing units 112-1 and 112-2 have the same configuration as the first processing unit 112 of the first embodiment and have the same functions and effects. The reflection direction of the leaked light Ll in the first processing units 112-1 and 112-2 is not limited to this example. The number of first processing units 112 may be three or more. Moreover, the multiple stages of first processing units 112-1 and 112-2 can be handled as a single integrated first processing unit 112. In this case, the D1 direction is an example of the third direction.

[0041] In this embodiment, the reflectance of the first processing unit 112-2 is set lower than that of the first processing unit 112-1, and the reflectance of the second processing unit 113 is set lower than that of the first processing unit 112-2. As an example, the reflectance of the first processing unit 112-1 is set to, for example, about 66.7% (about 2 / 3), the reflectance of the first processing unit 112-2 is set to, for example, about 50% (about 1 / 2), and the reflectance of the second processing unit 113 is set to, for example, about 0%. In this case, the first processing unit 112-1 absorbs about 1 / 3 of the energy of the leaked light Ll1 from the wavelength filter 111, the first processing unit 112-2 absorbs about 1 / 3 of the energy of the leaked light Ll1 from the wavelength filter 111, and the second processing unit 113 absorbs about 1 / 3 of the energy of the leaked light Ll1 from the wavelength filter 111. With such a setting, the energy of the leak light Ll can be absorbed by distributing it approximately evenly at a plurality of locations.

[0042] This embodiment can also prevent localized high temperature portions from occurring in the optical device 100A. Moreover, this embodiment can process the leak light Ll by dispersing it to more locations in the optical device 100A, which makes it easier to reduce localized temperature differences in the optical device 100A.

[0043] [Third embodiment] Fig. 3 is a plan view of an optical device 100B of a third embodiment. As shown in Fig. 3, the optical device 100B includes optical components such as a lens 115, a mirror 116, a wavelength filter 111, and a lens 117, and combines light having different wavelengths input from a plurality of optical fibers 20A and couples the combined light to an optical fiber 20B. The optical fibers 20A and 20B are each supported by a support 110. The lens 115 is, for example, a collimating lens, and the lens 117 is, for example, a condensing lens.

[0044] The optical device 100B having such a configuration also provides the same effects as those of the first embodiment.

[0045] In this embodiment, the normal direction of the light receiving surface 113a of the second processing unit 113 is inclined with respect to the opposite direction to the traveling direction (direction D2) of the leaked light Ll2. With this configuration, it is possible to prevent a small amount of reflected light from the light receiving surface 113a from returning to the wavelength filter 111 and adversely affecting the main light Lm.

[0046] [Fourth embodiment] Fig. 4 is a plan view of an optical device 100C of the fourth embodiment. As shown in Fig. 4, the optical device 100C is different from the optical device 100B of the third embodiment in that the optical device 100C includes one second processing unit 113C and does not include two second processing units 113. Except for this point, the optical device 100C of the fourth embodiment has the same configuration as the optical device 100B of the third embodiment.

[0047] In this embodiment, one second processing section 113C absorbs the leaked light Ll2 reflected by the two first processing sections 112. That is, one second processing section 113C is shared by the two first processing sections 112. With such a configuration, the number of processing sections in the optical device 100C can be reduced, which has the advantages of increasing the degree of freedom in the layout of components in the optical device 100C and reducing the manufacturing effort and cost by reducing the number of components.

[0048] In this embodiment, the reflectance of each of the first processing units 112 at two locations is set to, for example, approximately 33.3% (approximately 1 / 3), and the reflectance of the second processing unit 113 is set to, for example, approximately 0%. In this case, approximately 1 / 3 of the total energy of the leaked light Ll1 from the two wavelength filters 111 is absorbed in each of the first processing units 112-1 at two locations, and approximately 1 / 3 of the total energy of the leaked light Ll1 from the two wavelength filters 111 is absorbed in the second processing unit 113. With such settings, the energy of the leaked light Ll can be absorbed in a substantially even distribution manner at multiple locations.

[0049] [Fifth embodiment] Fig. 5 is a plan view of an optical device 100D according to a fifth embodiment. As shown in Fig. 5, the optical device 100D includes a housing 101, an optical fiber 20B supported by a support 110, a plurality of light-emitting units 10, and an optical component that combines light emitted from the plurality of light-emitting units 10. The optical device 100D may also be referred to as a light-emitting device.

[0050] The housing 101 has, for example, a case and a lid (not shown) and is sealed. The housing 101 is made of a material having high thermal conductivity, such as a copper-based material or an aluminum-based material.

[0051] In this embodiment, two arrays A1 and A2 in which a plurality of light-emitting units 10 are arranged at a predetermined interval (for example, a constant interval) in the Y direction are arranged substantially parallel to each other. The plurality of light-emitting units 10 output light of mutually different wavelengths (λ1, λ2, . . . , λn). The interval between the plurality of wavelengths is, for example, 5 [nm] to 20 [nm] between the center wavelengths. The light synthesized here may also include blue laser light. The light-emitting unit 10 is, for example, a semiconductor laser module.

[0052] The light emitting unit 10 includes, for example, a submount, a light emitting element mounted on the submount, and a collimating lens (not shown) that collimates the light emitted from the light emitting element in the fast axis direction, all in a hermetically sealed case. The light that passes through the collimating lens is emitted from a window provided in the case. Note that the light emitting unit 10 may be configured not to be hermetically sealed in the case, that is, may be configured such that the submount, the light emitting element, and the collimating lens are exposed in the housing 101.

[0053] The light output from the multiple light emitting units 10 is combined by multiple optical components. The optical components include a lens 115, a mirror 116, a wavelength filter 111, a combiner 120, lenses 117 (117-1, 117-2), and the like.

[0054] The lens 115 collimates the light in the Y direction (slow axis direction). The wavelength filter 111 is similar to the wavelength filter 111 in the above embodiment.

[0055] The combiner 120 combines the light from the two arrays A1 and A2 and outputs the combined light toward the lens 117-1. The lens 117-1 focuses the light in the Z direction (fast axis direction), and the lens 117-2 focuses the light in the X1 and X2 directions (slow axis direction). The combiner 120 may also be referred to as a wavelength combining unit.

[0056] In this embodiment, the first processing unit 112 and the second processing unit 113 process leaked light from the combiner 120. The leaked light Ll1 from the combiner 120 includes a component of the light from the array A1 that is not reflected by the combiner 120 and transmitted through the combiner 120, and a component of the light from the array A2 that is not reflected by the combiner 120 and reflected by the combiner 120. The first processing unit 112 absorbs and reflects the leaked light Ll1, and the second processing unit 113 absorbs the leaked light Ll2 reflected by the first processing unit 112. The combiner 120 is an example of an optical component.

[0057] The housing 101 is also provided with a cooling passage 130 for cooling the light-emitting units 10, the support 110, the lenses 117-1 and 117-2, the combiner 120, the heat transfer unit 114, and the like. In the cooling passage 130, for example, a coolant such as a cooling liquid flows. The cooling passage 130 passes, for example, near (directly below) the mounting surface of each component of the housing 101, and the inner surface of the cooling passage 130 is thermally connected to the components and parts to be cooled, that is, the light-emitting units 10, the support 110, the lenses 117-1 and 117-2, the combiner 120, and the heat transfer unit 114. The cooling passage 130 is also arranged so as to overlap with the maximum temperature position of the components and parts to be cooled in the line of sight in the Z direction. The part of the housing 101 where the cooling passage 130 is provided is an example of a cooling mechanism. The cooling mechanism is also an example of a heat dissipation part.

[0058] Fig. 6 is a side view (partial cross-sectional view) of the second processing unit 113 and the heat transfer unit 114 of the optical device 100D viewed in the opposite direction to the Y direction. As shown in Fig. 6, the heat transfer unit 114 and the second processing unit 113 protruding from the surface 101a of the housing 101 in the Z direction are provided on the surface 101a of the housing 101. The heat transfer unit 114 is attached to the surface 101a of the housing 101 by, for example, joining with a fastener such as a screw, joining with a thermally conductive adhesive, welding, or the like.

[0059] Further, the housing 101 is provided with a cooling passage 130 through which the refrigerant C flows, so as to overlap with the heat transfer section 114 and the second processing section 113 in the Z direction. As shown in Fig. 5, the cooling passage 130 is provided such that a portion of the section between the inlet 130a and the outlet 130b of the cooling passage 130 passes through a position that overlaps with the heat transfer section 114 in the Z direction.

[0060] In this manner, in this embodiment, the heat transfer unit 114 is thermally connected to the inner surface of the cooling passage 130 and the refrigerant C. Thus, according to this embodiment, heat exchange is performed between the second processing unit 113 and the refrigerant C via the heat transfer unit 114 and the housing 101, the second processing unit 113 in which heat is generated based on the energy of the leaked light Ll is cooled, and the temperature around the second processing unit 113 and the heat transfer unit 114 can be suppressed from increasing. Although not shown, the optical device 100D also has a configuration similar to that of FIG. 6 for the first processing unit 112, and heat exchange is performed between the first processing unit 112 and the refrigerant C via the heat transfer unit 114 and the housing 101, the first processing unit 112 in which heat is generated based on the energy of the leaked light Ll is cooled, and the temperature around the first processing unit 112 and the heat transfer unit 114 can be suppressed from increasing.

[0061] [Sixth embodiment] 7 is a plan view of an optical device 100E according to a sixth embodiment of the present invention. The optical device 100E combines and outputs light of the same wavelength λ1 (single wavelength λ1).

[0062] The housing 101 is provided with a stepped surface (not shown) for each of the arrays A1 and A2 in which a plurality of light-emitting units 10 are arranged at predetermined intervals (for example, constant intervals) in the Y direction, such that the positions of the light-emitting units 10 are shifted in the Z direction toward the opposite direction to the Y direction. The light-emitting units 10 are each placed on the stepped surface.

[0063] Each of the light emitting units 10 outputs light of the same wavelength λ1. The light emitting units 10 are, for example, semiconductor laser modules.

[0064] The light output from the multiple light emitting units 10 is combined by multiple optical components. The optical components include a lens 115, a mirror 116, a combiner 120E, lenses 117 (117-1, 117-2), and the like.

[0065] The mirrors 116, like the light-emitting units 10, are each placed on a stepped surface of the housing 101. The mirrors 116 each reflect light from the light-emitting units 10 that are optically coupled to them. The position of the stepped surface in the Z direction and the size of the mirrors 116 are set so as not to interfere with light from other mirrors 116.

[0066] The light from the array A1 is input to the combiner 120E via a half-wave plate 123 that rotates the polarization plane of the light, and the light from the array A2 is input to the combiner 120E without passing through the half-wave plate 123. The combiner 120E may also be referred to as a polarization combining section.

[0067] In this embodiment, the first processing unit 112 and the second processing unit 113E also process the leaked light from the combiner 120E. The leaked light Ll1 from the combiner 120E includes a component of the light from the array A1 that is not reflected by the combiner 120E and passes through the combiner 120E, and a component of the light from the array A2 that is not reflected by the combiner 120E and passes through the combiner 120E. The first processing unit 112 absorbs and reflects the leaked light Ll1, and the second processing unit 113E absorbs the leaked light Ll2 reflected by the first processing unit 112. The combiner 120E is an example of an optical component.

[0068] In this embodiment, the second processing unit 113E is provided on the inner surface of the side wall 101b of the housing 101. With this configuration, the side wall 101b can be used as a support for the second processing unit 113E and a heat transfer unit corresponding to the second processing unit 113E. With this configuration, the number of processing units in the optical device 100E can be reduced, and for example, the degree of freedom in the layout of parts in the optical device 100E can be increased, and the number of parts can be reduced, thereby reducing the manufacturing effort and cost. The second processing unit 113E may absorb and scatter the leak light Ll2.

[0069] [Seventh embodiment] Fig. 8 is a plan view of an optical device 100F of the seventh embodiment. As shown in Fig. 8, in this embodiment, the reflecting surface 112a of the first processing unit 112 is a concave surface. In this case, the leaked light Ll2 is converged and directed toward the direction D2. This configuration has the advantage that, for example, the second processing unit 113 and the heat transfer unit 114 can be made smaller.

[0070] [Eighth embodiment] FIG. 9 is a cross-sectional view of the second processing unit 113 and the heat transfer unit 114 included in the optical device 100G of the eighth embodiment. As shown in FIG. 9, in this embodiment, the second processing unit 113 and the light receiving surface 113a have a conical mortar shape with a diameter that decreases toward the D2 direction. The light receiving surface 113a also functions as a reflecting surface, and the leaked light Ll2 is multiple-reflected on the light receiving surface 113a. Therefore, the absorption rate of the leaked light Ll2 in the second processing unit 113 can be further increased. According to such a configuration, for example, it is possible to suppress leakage of the leaked light Ll2 into the housing 1, and thus it is possible to obtain an advantage that it is easier to avoid undesirable events caused by the leaked light Ll2.

[0071] [Ninth embodiment] FIG. 10 is a cross-sectional view of the second processing unit 113 and the heat transfer unit 114 included in the optical device 100H of the ninth embodiment. As shown in FIG. 10, in this embodiment, the second processing unit 113 and the light receiving surface 113a have a bottomed cylindrical shape that opens in the opposite direction to the D2 direction. In addition, the light receiving surface 113a is configured as a rough surface with a roughened surface, and also functions as a reflecting surface that diffusely reflects the leaked light Ll2, and the leaked light Ll2 is multiple-reflected on the light receiving surface 113a. Therefore, the absorption rate of the leaked light Ll2 in the second processing unit 113 can be further increased. According to such a configuration, for example, it is possible to suppress leakage of the leaked light Ll2 into the housing 1, and thus it is possible to obtain an advantage that it is easier to avoid undesirable events caused by the leaked light Ll2.

[0072] 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. [Explanation of symbols]

[0073] 10…Light emitting unit 20A, 20B...Optical fiber 100,100A~100H…Optical device 101…Housing 101a…Surface 101b…Side wall 110...Support part 111...Wavelength filter (optical component) 111a...reflective surface 112, 112-1, 112-2...First processing section 112a...Reflective surface 113, 113C, 113E...Second processing section 113a...Light receiving surface 114…Heat transfer section 115…Lens 116…Mirror 117, 117-1, 117-2...Lens 120…Combiner (optical component) 120E…Combiner (optical component) 123...1 / 2 wavelength plate 130…Cooling passage (cooling mechanism, heat radiation part) 130a…Entrance 130b…Exit A1, A2…Array C...refrigerant D1…Direction (first direction, third direction) D2…Direction (second direction, third direction, predetermined direction) L1…Light (first light) L2…Light (second light) Ll, Ll1, Ll2, Ll3...Leakage light Lm…Main light L1t,L2t…Transmitted light L1r,L2r…Reflected light

Claims

1. a wavelength filter that reflects a first light traveling in a first direction in a second direction and transmits a second light traveling in the second direction and having a wavelength different from that of the first light, and generates leaked light traveling in the first direction that includes a component of the first light that has transmitted in the first direction and a component of the second light that has been reflected in the first direction; a first processing unit that reflects the leaked light in a predetermined direction and absorbs the leaked light to convert it into heat; At least one second processing unit that absorbs the leaked light from the first processing unit and converts it into heat; An optical device comprising: The wavelength filter does not have 100% reflection and transmission characteristics, when the wavelength of the first light is longer than the wavelength of the second light, the wavelength filter is a short-pass filter; when the wavelength of the first light is shorter than the wavelength of the second light, the wavelength filter is a long-pass filter; The reflectance of the leaked light in the first processing unit is set to approximately 50 percent, The reflectance of the leaked light in the second processing unit is set to approximately 0 percent, An optical device in which the first processing unit and the second processing unit are arranged separately from each other, and each of the first processing unit and the second processing unit is provided with a heat transfer unit that transfers heat generated by absorption of the leakage light to a heat dissipation unit, thereby suppressing local temperature rise within the optical device.

2. The optical device according to claim 1 , further comprising a cooling mechanism for cooling at least one of the first processing section and the second processing section.

3. A plurality of wavelength filters as the wavelength filter; a plurality of first processing units serving as the first processing unit into which the leaked light is incident from each of the wavelength filters different from each other; Equipped with The optical device according to claim 1 , wherein the leaked light from the plurality of first processing sections is incident on the at least one second processing section.

4. 4. The optical device according to claim 1, wherein the first light and the second light have different polarization planes.

5. 5. The optical device according to claim 1, wherein the first light and the second light are emitted from different light sources.

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