JP2018173610A - Laser module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a laser module in which a decrease in coupling efficiency, being possible when resin for fixing collimator lenses expands, between a laser diode group and an optical fiber is suppressed smaller than conventional ones.SOLUTION: A direction of a displacement of a beam intersection that is caused when a resin (R1) for fixing each of collimator lenses (Ci) making up a collimator lens group (C) on a substrate (B) expands and a direction of a displacement of an optical fiber (OF) that is caused when a resin (R) for fixing the optical fiber (OF) on the substrate (B) expands are oriented in a common direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser module including a plurality of laser diodes and an optical fiber.

  As a light source for outputting a laser beam, a laser module including a plurality of laser diodes and an optical fiber is widely used. An example of a document disclosing such a laser module is Patent Document 1.

  As shown in FIG. 5, the laser module 10 described in Patent Document 1 includes: (1) a first laser beam whose optical axes are arranged in parallel in a first plane and whose F axis is orthogonal to the first plane. A laser diode group LD for generating a beam bundle; and (2) a collimating lens group C for collimating the spread in the F-axis direction of each laser beam constituting the first beam bundle generated by the laser diode group LD; ) The first beam bundle in which the spread in the F-axis direction of each laser beam is collimated by the collimating lens group C is arranged so that the optical axis is aligned in parallel in the second plane and the F-axis is parallel to the second plane. A mirror group M for converting into a second laser beam bundle of beams; and (4) a second beam bundle refracted in the second plane by refracting each laser beam constituting the second beam bundle obtained by the mirror group M. Focus beam bundle A focusing lens L, and a, and optical fiber OF for receiving the second beam flux is focused at (5) focusing lens L. The tip of the optical fiber OF is protected by a ferrule F.

  Each double mirror Mi (i = 1 to 6) constituting the mirror group M includes a first mirror Mi1 that reflects each laser beam constituting the first beam bundle, and a laser beam reflected by the first mirror. The second mirror Mi2 is configured to reflect. In the laser module 10, (a) by adjusting the direction of the first mirror Mi <b> 1 of each double mirror Mi (slightly rotating about the z axis as a rotation axis), the traveling direction of the corresponding laser beam in the second beam bundle (B) by adjusting the direction of the second mirror Mi2 of each of the duplex mirrors Mi (by slightly rotating about the z axis as the rotation axis), the corresponding laser in the second beam bundle The traveling direction of the beam can be changed in the azimuth direction. For this reason, even if there is variation in the traveling direction of the laser beam constituting the first beam bundle incident on the mirror group M, the orientation of the first mirror Mi1 and the second mirror Mi2 of each duplex mirror Mi is adjusted. A second beam bundle composed of laser beams with no variation in the traveling direction can be obtained.

  In the laser module 10, each collimating lens Ci constituting the collimating lens group C is fixed to the substrate B by using, for example, a columnar lens support Pi. As a document disclosing such a collimating lens fixing method, for example, Patent Document 2 is cited. In the laser module 10, the optical fiber OF is fixed to the substrate B using, for example, a pedestal with holes (not shown). As a document disclosing such an optical fiber fixing method, for example, Patent Document 3 is cited.

JP2015-148810A (released on August 20, 2015) JP2015-128193A (released on July 9, 2015) Japanese Patent Laying-Open No. 2015-169794 (published on September 8, 2015)

  In the conventional laser module 10, each collimating lens Ci constituting the collimating lens group C is fixed to the substrate B using a columnar lens support Pi as shown in FIG. 6. At this time, the bottom surface of the lens support Pi is bonded and fixed to the upper surface of the substrate B using the resin R1, and the side surface of the collimating lens Ci is bonded and fixed to the side surface of the lens support Pi using the resin R2. These resins R1 and R2 swell and absorb water.

  When the resin R1 used for adhesion between the substrate B and the lens support Pi is absorbed and expanded, the lens support Pi is displaced away from the substrate B as shown in FIG. As a result, the collimating lens Ci is displaced in the direction away from the substrate B, that is, in the direction parallel to the F axis of the laser beam incident on the collimating lens Ci.

  Then, as shown in FIG. 7, the traveling direction of each laser beam constituting the first beam bundle incident on the mirror group M changes in the elevation angle direction. As a result, as shown in FIG. 7, the traveling direction of each laser beam constituting the second beam bundle emitted from the mirror group M changes to the azimuth direction. In FIG. 7, the optical axis of the laser beam before the traveling direction is changed is indicated by a solid line, and the optical axis of the laser beam after the traveling direction is changed is indicated by a dotted line.

  When the traveling direction of each laser beam constituting the second beam bundle before being focused by the focusing lens L changes as described above, the second after being focused by the focusing lens L as shown in FIG. The traveling direction of each laser beam constituting the beam bundle changes, and as a result, the intersection of these laser beams is displaced. As a result, the coupling efficiency between the laser diode group L and the optical fiber OF is lowered. For example, as shown in FIG. 8, when the optical axis of the focusing lens L and the central axis of the optical fiber OF coincide with each other, if the magnitude of the displacement at the intersection exceeds the core radius of the optical fiber OF, these laser beams Cannot enter the core of the optical fiber OF.

  Here, the problem that may occur when the resin used for bonding and fixing the collimating lens expands due to water absorption has been described, but the same problem occurs when the resin expands due to a cause other than water absorption (for example, heating). Can occur. Further, when using a pedestal with a hole bonded and fixed to the upper surface of the substrate B in order to fix the optical fiber OF, the same problem may occur due to the expansion of the adhesive for fixing the pedestal with the hole to the substrate B. .

  Further, if the configuration in which the lens support Pi is solder-fixed to the substrate B is employed instead of the configuration in which the lens support Pi is bonded and fixed to the substrate B, the above-described problems can be avoided. However, the cost required to fix the support Pi to the substrate B by soldering is significantly higher than the cost required to bond and fix the support Pi to the substrate B. This is because when the support Pi is fixed to the substrate B by soldering, it is necessary to perform metallization on both joint surfaces. Therefore, in the laser module 10 including the plurality of laser diodes LD1 to LDn, the method of soldering the lens supports P1 to Pn to the substrate B may be disadvantageous from a commercial viewpoint.

  The present invention has been made in view of the above problems, and its purpose is to reduce the coupling efficiency between a laser diode group and an optical fiber that may occur when a resin for fixing a collimating lens expands. It is to realize a laser module that is smaller than the above.

  The laser module according to the present invention is a laser light source group including a substrate and a plurality of laser light sources, the laser light source group fixed to the substrate, and lasers output from the laser light sources constituting the laser light source group. A collimating lens group comprising collimating lenses for collimating the beam, each collimating lens being fixed to the substrate using a first resin, and collimating by each collimating lens constituting the collimating lens group. A converging lens for converging a beam bundle composed of laser beams, a converging lens fixed to the substrate, and an optical fiber for receiving the beam bundle converging by the converging lens, using a second resin And an optical fiber fixed to the substrate, and the beam bundle generated when the first resin expands. The direction of displacement of over beam intersection angle formed between the direction of displacement of the optical fiber that occurs when the second resin is inflated is less than 90 °, characterized in that.

  According to said structure, the fall of the coupling efficiency of the said laser light source group and the said optical fiber which may arise when the said 1st resin expand | swells can be suppressed.

  In the laser module according to the present invention, it is preferable that the direction of the displacement of the beam intersection and the direction of the displacement of the optical fiber are common.

  According to said structure, the fall of the coupling efficiency of the said laser light source group and the said optical fiber which may arise when the said 1st resin expand | swells can further be suppressed.

  In the laser module according to the present invention, it is preferable that the amount of displacement of the beam intersection and the amount of displacement of the optical fiber are substantially the same.

  According to said structure, the fall of the coupling efficiency of the said laser light source group and the said optical fiber which may arise when the said 1st resin expand | swells can further be suppressed.

  The laser module according to the present invention is a mirror group interposed between the collimating lens group and the focusing lens, and crosses the laser beam collimated by each collimating lens constituting the collimating lens group with the substrate. A collimating lens group further comprising a mirror group including a double mirror having a first mirror that reflects in a direction and a second mirror that reflects the laser beam reflected by the first mirror in a direction along the substrate. Each of the collimating lenses constituting the first lens is displaced at least in a direction intersecting the substrate when the first resin is expanded, and the optical fiber is displaced in a direction along the substrate when the second resin is expanded. It is preferable.

  According to said structure, in the laser module which has the said mirror group, the fall of the coupling efficiency of the said laser light source group and the said optical fiber which may arise when the said 1st resin expand | swells can be suppressed.

  The laser module according to the present invention further includes a fiber support having a cantilever structure having a pillar portion whose bottom surface is fixed to the substrate and a beam portion for holding the optical fiber, and the beam portion includes the beam intersection. It is preferable that the second resin is bonded and fixed to the side surface of the column portion facing the displacement direction.

  According to the above configuration, in the laser module having the mirror group, a decrease in the coupling efficiency between the laser light source group and the optical fiber, which may occur when the first resin expands, is supported by a simple fiber support. It can be suppressed by the body.

  The laser module according to the present invention further includes a columnar fiber support body having a bottom surface fixed to the substrate and having a U-shaped groove formed on a side surface facing a displacement direction of the beam intersection. It is preferable that the U-shaped groove is bonded and fixed using the second resin.

  According to the above configuration, in the laser module having the mirror group, a reduction in coupling efficiency between the laser light source group and the optical fiber, which may occur when the first resin expands, is a fiber having a simpler configuration. It can be suppressed by the support.

  ADVANTAGE OF THE INVENTION According to this invention, the laser module which suppressed the fall of the coupling efficiency of the laser diode group and optical fiber which may arise when the resin for fixing a collimating lens expand | swells smaller than before can be implement | achieved.

It is a perspective view which shows the structure of the laser module which concerns on Embodiment 1 of this invention. It is sectional drawing of the fiber support body with which the laser module shown in FIG. 1 is provided. It is a top view of the focusing lens and optical fiber with which the laser module shown in FIG. 1 is equipped. It is sectional drawing which shows the modification of the fiber support body with which the laser module shown in FIG. 1 is provided. It is a perspective view which shows the structure of the conventional laser module. It is sectional drawing of the collimating lens with which the laser module shown in FIG. 5 is provided, and a lens support body. FIG. 6 is a perspective view of a laser diode, a collimating lens, a lens support, a double mirror, and a focusing lens provided in the laser module shown in FIG. 5. FIG. 6 is a plan view of a focusing lens and an optical fiber provided in the laser module shown in FIG. 5.

[Configuration of laser module]
A configuration of a laser module 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the configuration of the laser module 1. FIG. 2 is a cross-sectional view of the fiber support Q included in the laser module 1.

  As shown in FIG. 1, the laser module 1 includes one substrate B, a laser diode group LD composed of n laser diodes LD1 to LDn, a collimating lens group C composed of n collimating lenses C1 to Cn, A lens support group P composed of n lens supports P1 to Pn, a mirror group M composed of n double mirrors Mi, one focusing lens L, one optical fiber OF, and one ferrule F And one fiber support Q. In FIG. 1, the configuration in the case of n = 5 is illustrated, but n is an arbitrary natural number. The laser module 1 excluding the laser diode group LD, the optical fiber OF, and the support Q is referred to as a light guide device.

  The laser diode LDi (i is a natural number of 1 or more and n or less) is a configuration for generating a laser beam. In the present embodiment, in the illustrated coordinate system, the laser diode placed on the substrate B is arranged such that the active layer is parallel to the xy plane and the emission end face is parallel to the zx plane. Used as laser diodes LD1 to LDn. The laser diode LDi outputs a laser beam whose traveling direction coincides with the positive y-axis direction, the F (Fast) axis is parallel to the z-axis, and the S (Slow) axis is parallel to the x-axis. These laser diodes LD1 to LDn are arranged so that the emission end faces of the respective laser diodes LDi are located on a straight line parallel to the x axis, and the laser beams output from the laser diodes LD1 to LDn have an optical axis. A parallel bundle of laser beams (hereinafter referred to as “the first plane”) parallel to the xy plane and composed of laser beams whose F axis is parallel to the z axis (perpendicular to the first plane). The first beam bundle). The first plane is a virtual plane including the optical axis of the laser beam output from the laser diodes LD1 to LDn, and is not a physical entity.

  A collimating lens Ci is disposed on the optical path of the laser beam generated by the laser diode LDi. The collimating lens Ci is a configuration for collimating the spread in the F-axis direction of the laser beam output from the corresponding laser diode LDi out of the laser beams constituting the first beam bundle. In the present embodiment, in the illustrated coordinate system, the flat surface (incident surface) faces the negative y-axis direction, the curved surface (exit surface) faces the positive y-axis direction, and the y-axis positive cross section parallel to the yz plane. Plano-convex cylindrical lenses arranged so that the outer edge on the direction side draws an arc are used as the collimating lenses C1 to Cn.

  A lens support Pi is arranged on the side of the collimating lens Ci. The lens support Pi is configured to support the corresponding collimating lens Ci. In the present embodiment, in the illustrated coordinate system, the four side surfaces face the x-axis positive direction, the y-axis positive direction, the x-axis negative direction, and the y-axis negative direction, respectively, and the upper surface and the lower surface respectively represent the z-axis positive direction and A rectangular parallelepiped glass block arranged to face the negative z-axis direction is used as the lens supports P1 to Pn. As shown in FIG. 6, the bottom surface of the lens support Pi is bonded and fixed to the top surface of the substrate B using a resin R1. Further, the side surface of the collimator lens Ci on the x-axis negative direction side is bonded and fixed to the side surface of the lens support Pi on the x-axis positive direction side using the resin R2. In the present embodiment, a configuration in which the collimating lens Ci is fixed to the substrate B through the lens support Pi is adopted, but the present invention is not limited to this. That is, a configuration in which the collimating lens Ci is directly fixed to the substrate B may be employed. In this case, the collimating lens Ci and the upper surface of the substrate B are directly bonded and fixed using resin.

  A double mirror Mi is arranged on the optical path of the laser beam collimated in the F-axis direction by the collimating lens Ci. The double mirror Mi is placed on the upper surface of the substrate B, and the lower surface thereof is placed on the upper surface of the first mirror Mi1, the lower surface of which is adhered and fixed to the upper surface of the substrate B, and the lower surface is the first mirror. The second mirror Mi2 is bonded and fixed to the upper surface of Mi1. The first mirror Mi1 has a reflecting surface whose normal vector forms 45 ° with the z-axis positive direction in the illustrated coordinate system, and the corresponding collimating lens among the laser beams constituting the first beam bundle. The collimated laser beam is reflected to change the traveling direction from the y-axis positive direction to the z-axis positive direction, and the F-axis is changed from a state parallel to the z-axis to a state parallel to the y-axis. The second mirror Mi2 has a reflecting surface whose normal vector forms 135 ° with the z-axis positive direction in the illustrated coordinate system, and reflects the laser beam reflected by the corresponding first mirror Mi1. Then, the traveling direction is converted from the z-axis positive direction to the substantially x-axis positive direction, and the S-axis is converted from a state parallel to the x-axis to a state parallel to the z-axis. In the double mirror Mi, (a) by adjusting the direction of the first mirror Mi1 (slightly rotating about the z axis as a rotation axis), the traveling direction of the laser beam reflected by the second mirror Mi2 is changed to the elevation angle direction. (B) By adjusting the direction of the second mirror Mi2 (slightly rotating about the z-axis as the rotation axis), the traveling direction of the laser beam reflected by the second mirror Mi2 can be changed to the azimuth angle. Can be changed in direction.

  These double mirrors M1 to Mn are arranged such that the optical path length li from each laser diode LDi to the double mirror Mi is l1 <l2 <... <Ln, and reflected by the second mirrors M12 to Mn2. The laser beam thus formed is a laser beam whose optical axis is arranged in a plane parallel to the xy plane (hereinafter referred to as “second plane”) and whose F axis is parallel to the xy plane (parallel to the second plane). A beam bundle (hereinafter referred to as “second beam bundle”) is configured. That is, in the mirror group M, the first beam bundle composed of laser beams whose optical axes are arranged in a first plane parallel to the xy plane and whose F axis is orthogonal to the first plane, and the optical axis is parallel to the xy plane. Are converted into a second beam bundle composed of laser beams arranged in the second plane and having the F axis parallel to the second plane. Note that whether the second beam bundle obtained by the mirror group M is a parallel bundle, a convergent bundle, or a divergent bundle depends on, for example, the direction of the second mirrors M12 to Mn2. In the present embodiment, the directions of the second mirrors M12 to Mn2 are determined so that the second beam bundle forms a convergent bundle. The second plane is a virtual plane including the optical axis of the laser beam output from the second mirrors M12 to Mn2, and is not a physical entity.

  A focusing lens L is arranged on the optical path of the second beam bundle obtained by the mirror group M. The focusing lens L is configured to focus the second beam bundle by refracting each laser beam constituting the second beam bundle in the second plane. In the present embodiment, in the illustrated coordinate system, the curved surface (incident surface) faces the negative x-axis direction, the flat surface (exit surface) faces the positive x-axis direction, and the cross-section parallel to the xy plane is negative on the x-axis. A plano-convex cylindrical lens arranged so that the outer edge on the direction side forms an arc is used as the focusing lens L. For this reason, the converging lens L has a function of condensing the laser beams constituting the second beam bundle so that the F-axis diameter is gradually reduced in addition to the function of converging the second beam bundle. The laser beams constituting the second beam bundle after being focused by the focusing lens L intersect at one point. Hereinafter, a point where the laser beams constituting the second beam bundle after being focused by the focusing lens L intersect is referred to as a beam intersection.

  The optical fiber OF is arranged so that the incident end face is directed in the negative x-axis direction and the beam intersection is located at the center of the incident end face. The tip of the optical fiber OF is protected by the ferrule F, and is supported by the fiber support Q together with the ferrule F.

  The fiber support Q is a cantilever beam support having a column part Q1 and a beam part Q2. In the present embodiment, in the illustrated coordinate system, the four side surfaces face the x-axis positive direction, the y-axis positive direction, the x-axis negative direction, and the y-axis negative direction, respectively, and the upper surface and the lower surface respectively represent the z-axis positive direction and A rectangular parallelepiped glass block arranged to face the negative z-axis direction is used as the column part Q1 and the beam part Q2. The beam portion Q2 is provided with a through hole penetrating from the x-axis positive direction side to the x-axis negative direction side in the illustrated coordinate system. By inserting the ferrule F into the through hole, the tip of the optical fiber OF can be fixed to the fiber support Q.

  The bottom surface of the column portion Q1 of the fiber support Q is fixed to the upper surface of the substrate B by solder S as shown in FIG. Further, the side surface on the y-axis negative direction side of the beam portion Q2 of the fiber support Q is bonded and fixed to the side surface on the y-axis positive direction side of the column portion Q1 with a resin R as shown in FIG. At this time, the beam portion Q2 is fixed to the column portion Q1 so that the upper surface thereof is flush with the upper surface of the column portion Q1. Since the overall height of the beam portion Q2 is smaller than the overall height of the column portion Q1, the lower surface of the beam portion Q2 is separated from the upper surface of the substrate B.

  A collimating lens for collimating the spread of the laser beam in the S-axis direction may be provided on the optical path of the laser beam from each collimating lens Ci to the corresponding double mirror Mi. Further, on the optical path of the second beam bundle extending from the focusing lens L to the optical fiber OF, a collection for condensing each laser beam constituting the second beam bundle so that the S-axis diameter is gradually reduced. An optical lens may be provided. As a result, even when the spread angle of the laser beam generated in each laser diode LDi in the S-axis direction is large, the coupling efficiency between the laser diode group LD and the optical fiber OF can be kept high.

  In the present embodiment, a mirror having an outer surface as a reflection surface is used as the second mirror Mi2 of each duplex mirror Mi, but the present invention is not limited to this. That is, a prism having an inner surface as a reflection surface may be used as the second mirror Mi2 of each duplex mirror Mi. In this case, the laser beam reflected by the first mirror Mi1 enters the inside of the prism, is totally reflected by the inner surface of the prism (the boundary surface between the prism and air), and is emitted to the outside of the prism. Will be.

[Effect of laser module]
Next, the effect of the laser module 1 will be described with reference to FIG. FIG. 3 is a plan view of the focusing lens L and the optical fiber OF included in the laser module 1.

  As described above, the collimating lens Ci that collimates each laser beam constituting the first beam bundle is supported by the lens support Pi whose lower surface is bonded and fixed to the upper surface of the substrate B. Therefore, when the resin R1 (see FIG. 6) for adhering and fixing the lower surface of the lens support i to the upper surface of the substrate B absorbs and expands, the collimating lens Ci is displaced at least in the z-axis positive direction. Then, the beam intersection (the point where the laser beams constituting the second beam bundle after being focused by the focusing lens L intersect) is displaced in the y-axis positive direction as shown in FIG.

  Further, as described above, the optical fiber OF is formed by the beam portion Q2 of the fiber support Q whose side surface on the y-axis negative direction side is bonded and fixed to the side surface on the y-axis positive direction side of the column portion Q1 of the fiber support Q. It is supported. Therefore, when the resin R (see FIG. 2) for adhering and fixing the side surface of the beam portion Q2 on the y-axis negative direction side to the side surface of the column portion Q1 on the y-axis positive direction side absorbs and expands, the optical fiber OF becomes as shown in FIG. As shown in FIG.

  That is, in order to fix the optical fiber OF to the substrate B and the direction of displacement of the beam intersection of the beam bundle generated when the resin R1 for fixing each collimating lens Ci constituting the collimating lens group C to the substrate B expands. The direction of displacement of the optical fiber OF that occurs when the resin R expands is common. Therefore, compared with the case where the optical fiber OF is stationary or compared with the case where the direction of displacement of the optical fiber OF is not common with the direction of displacement of the beam intersection, the coupling efficiency that can be generated when the resin R1 absorbs and expands. The decrease is kept small. In particular, when the amount of displacement at the beam intersection that occurs when the resin R1 absorbs and expands is equal to the amount of displacement of the optical fiber OF that occurs when the resin R absorbs and expands, the reduction in coupling efficiency can be further reduced. It becomes possible. If the angle between the direction of displacement of the beam intersection and the direction of displacement of the optical fiber OF is less than 90 °, the same effect as described above can be obtained. That is, for example, even if the beam intersection displacement direction is not the y-axis positive direction but the Z-axis positive direction, or the beam intersection displacement direction is both the y-axis positive direction and the Z-axis positive direction, Effects similar to the above effects can be obtained. Further, if the amount of displacement at the beam intersection is substantially the same as the amount of displacement of the optical fiber OF, the above effect becomes even more remarkable. Here, the amount of displacement at the beam intersection and the amount of displacement of the optical fiber OF are substantially the same. That is, the difference in the amount of displacement between the two is sufficiently small, for example, the difference in the amount of displacement between the two. Is within 5% of the amount of displacement between the two.

  In particular, since the fiber support Q in FIG. 2 is composed of at least the column part Q1, the beam part Q2, and the resin R for bonding and fixing the side surfaces of both, the coupling efficiency can be improved with a relatively simple structure. It is possible to suppress the decrease. In particular, if each of the column part Q1 and the beam part Q2 has a rectangular parallelepiped configuration, it is possible to suppress a decrease in coupling efficiency with a much simpler configuration without relatively complicated processing.

  In order to obtain the above effect to the maximum, the direction of the second mirror Mi2 in each duplex mirror Mi is adjusted so that a beam intersection is formed at the center of the incident end face of the optical fiber OF in the dry state. It is preferable. For this reason, when the laser module 1 is manufactured, the resin R1 for bonding and fixing each lens support Pi to the substrate B and the beam portion Q2 of the fiber support Q are bonded and fixed to the column portion Q1 of the fiber support Q. It is preferable to adjust the direction of the second mirror Mi2 in each of the double mirrors Mi so that the beam intersection is formed at the center of the incident end face of the optical fiber OF after the resin for drying is dried by annealing treatment or the like.

[Modification of fiber support]
Next, a modification of the fiber support Q will be described with reference to FIG. FIG. 4 is a cross-sectional view of a fiber support Q according to this modification.

  In the fiber support Q according to this modification, a U-shaped groove Q3 extending from the side surface on the positive x-axis direction side to the side surface on the negative x-axis side is formed on the side surface on the y-axis positive direction side of the rectangular parallelepiped glass block. Is. The U-shaped groove Q3 is for accommodating a half of the ferrule F on the positive side in the y-axis direction, and has a semicircular cross-sectional shape whose radius is slightly larger than the radius of the ferrule F. The ferrule F is bonded and fixed to the fiber support Q by the resin R3 filled in the U-shaped groove Q3. The fiber support Q is the same as the fiber support Q shown in FIG. 2 in that the lower surface of the fiber support Q is fixed to the upper surface of the substrate B by solder S.

  Also in the laser module 1 using the fiber support Q according to this modification, when the resin R3 for adhering and fixing the ferrule F to the fiber support Q absorbs and expands, the optical fiber OF is displaced in the positive y-axis direction. Therefore, the same effect as the laser module 1 provided with the fiber support Q shown in FIG. 2 can be obtained. Moreover, since the optical fiber OF is provided inside the U-shaped groove Q3 via the resin R3, it is possible to further improve the stability of fixing the optical fiber OF.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

1 Laser module LD Laser diode group (laser light source group)
LD1 to LD5 Laser diode C Collimating lens group C1 to C5 Collimating lens P Lens support group P1 to P5 Lens support body M Mirror group M1 to M5 Double mirror L Focusing lens OF Optical fiber F Ferrule Q Fiber support Q1 Pillar part Q2 Beam R, R1, R2, R3 Resin

Claims (6)

A substrate,
A laser light source group composed of a plurality of laser light sources, the laser light source group fixed to the substrate;
A collimating lens group comprising a collimating lens for collimating a laser beam output from each laser light source constituting the laser light source group, wherein each collimating lens is fixed to the substrate using a first resin; ,
A converging lens for converging a beam bundle of laser beams collimated by each collimating lens constituting the collimating lens group, the converging lens fixed to the substrate;
An optical fiber for receiving the beam bundle focused by the focusing lens, the optical fiber fixed to the substrate using a second resin,
The angle formed by the direction of displacement of the beam intersection of the beam bundle that occurs when the first resin expands and the direction of displacement of the optical fiber that occurs when the second resin expands is less than 90 °.
A laser module characterized by that. The direction of the displacement of the beam intersection and the direction of the displacement of the optical fiber are common.
The laser module according to claim 1. The amount of displacement of the beam intersection is substantially the same as the amount of displacement of the optical fiber;
The laser module according to claim 1 or 2, wherein A mirror group interposed between the collimating lens group and the focusing lens, the first mirror reflecting a laser beam collimated by each collimating lens constituting the collimating lens group in a direction intersecting the substrate; A mirror group comprising a double mirror having a second mirror that reflects the laser beam reflected by the first mirror in a direction along the substrate;
Each collimating lens constituting the collimating lens group is displaced at least in a direction intersecting the substrate when the first resin expands,
The optical fiber is displaced in a direction along the substrate when the second resin expands.
The laser module according to any one of claims 1 to 3, wherein: A fiber support having a cantilever structure having a pillar portion whose bottom surface is fixed to the substrate and a beam portion for holding the optical fiber;
The beam portion is bonded and fixed to the side surface of the column portion facing the direction of displacement of the beam intersection using the second resin.
The laser module according to claim 4. A columnar fiber support having a bottom surface fixed to the substrate and a U-shaped groove formed on a side surface facing a displacement direction of the beam intersection;
The optical fiber is bonded and fixed to the U-shaped groove using the second resin.
The laser module according to claim 4.

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