Monitor unit and optical module

Abstract

A monitoring unit (3) comprises: a holder (3c); a light branching unit (3a) that branches laser light into first laser light and second laser light; and a light detecting unit (3b) that detects the second laser light. The light branching unit (3a) and the light detecting unit (3b) are fixed to the holder (3c) so that the second laser light enters the light detecting unit (3b).

Description

[Technical Field]

[0001] This disclosure relates to a monitor unit and an optical module. This application claims priority to Japanese Patent Application No. 2021-183153, filed on November 10, 2021, and incorporates by reference all of the contents of said Japanese application. [Background technology]

[0002] A light source including a semiconductor laser element such as a laser diode and a housing that houses the semiconductor laser element is known. When using a semiconductor laser element, a portion of the laser light is usually monitored to maintain a desired output state. As mentioned above, when the semiconductor laser element is housed in a housing, it is conceivable to split a portion of the laser light output from the housing to the outside using a beam splitter or the like, and detect the split laser light with a photodetector (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-204550 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-43305 Summary of the Invention

[0004] A monitor unit according to one embodiment includes a holder, a light branching unit that branches a laser beam into a first laser beam and a second laser beam, and a light detecting unit that detects the second laser beam. The light branching unit and the light detecting unit are fixed to the holder so that the second laser beam is incident on the light detecting unit. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a perspective view of an optical module according to the first embodiment. [Figure 2]FIG. 2 is a perspective view of the optical module shown in FIG. 1 as seen from below. [Figure 3] FIG. 3 is an exploded perspective view of the optical module shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of the optical module shown in FIG. [Figure 5] FIG. 5 is a front view of the optical module shown in FIG. [Figure 6] FIG. 6 is a rear view of the optical module shown in FIG. [Figure 7] FIG. 7 is a top view of the optical module shown in FIG. [Figure 8] FIG. 8 is a bottom view of the optical module shown in FIG. [Figure 9] FIG. 9 is a right side view of the optical module shown in FIG. [Figure 10] FIG. 10 is a left side view of the optical module shown in FIG. [Figure 11] FIG. 11 is a bottom view of the monitor unit included in the optical module shown in FIG. [Figure 12] FIG. 12 is a perspective view showing an optical module according to the second embodiment. [Figure 13] FIG. 13 is an exploded perspective view of the optical module shown in FIG. [Figure 14] FIG. 14 is a cross-sectional view taken along line XIV-XIV of the optical module shown in FIG. [Figure 15] FIG. 15 is a perspective view showing an optical module according to the third embodiment. [Figure 16] FIG. 16 is an exploded perspective view of the optical module shown in FIG. [Figure 17] FIG. 17 is a cross-sectional view of the optical module shown in FIG. 15 taken along line XVII-XVII. [Figure 18] FIG. 18 is a perspective view showing an optical module according to the fourth embodiment. [Figure 19] FIG. 19 is a perspective view of the optical module shown in FIG. 18 as seen from below. [Figure 20]FIG. 20 is an exploded perspective view of the optical module shown in FIG. [Figure 21] FIG. 21 is a cross-sectional view of the optical module shown in FIG. 18 taken along line XXI-XXI. [Figure 22] FIG. 22 is a front view of the optical module shown in FIG. [Figure 23] FIG. 23 is a rear view of the optical module shown in FIG. [Figure 24] FIG. 24 is a top view of the optical module shown in FIG. [Figure 25] FIG. 25 is a bottom view of the optical module shown in FIG. [Figure 26] FIG. 26 is a right side view of the optical module shown in FIG. [Figure 27] FIG. 27 is a left side view of the optical module shown in FIG. [Figure 28] FIG. 28 is a perspective view showing an optical module according to the fifth embodiment. [Figure 29] FIG. 29 is an exploded perspective view of the optical module shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0006] [Problem to be solved by this disclosure] When monitoring laser light output from a semiconductor laser element housed in a housing (for example, a CAN-type housing) from outside the housing as described in Patent Documents 1 and 2, adjustment of the optical axes of the beam splitter and photodetector is required, etc. Therefore, it has not been possible to easily monitor laser light output from a semiconductor laser element.

[0007] An object of the present disclosure is to provide a monitor unit that can easily monitor laser light output from a housing that houses a semiconductor laser element, and an optical module that includes the same.

[0008] [Effects of this disclosure] According to the present disclosure, it is possible to provide a monitor unit that can easily monitor laser light output from a housing that houses a semiconductor laser element, and an optical module including the monitor unit.

[0009] [Description of the embodiments of the present disclosure] First, the contents of the embodiments of the present disclosure will be listed and described.

[0010] A monitor unit according to one embodiment includes a holder, a light branching unit that branches a laser beam into a first laser beam and a second laser beam, and a light detecting unit that detects the second laser beam. The light branching unit and the light detecting unit are fixed to the holder so that the second laser beam is incident on the light detecting unit.

[0011] In the above configuration, the optical branching unit and the optical detection unit are fixed to the holder in advance in the positioned state as described above. Therefore, by attaching a monitor unit to the light source unit described below, it is possible to easily monitor the laser light.

[0012] The holder may have a first open end and a second open end, a hollow sidewall, and an end wall provided at the first open end. The end wall may have a base formed thereon to hold the light branching unit inclined with respect to the output direction of the laser light. The light detection unit may be attached to an outer surface of the sidewall on the optical path of the second laser light. The sidewall may have an optical path formed therein to pass the second laser light toward the light detection unit.

[0013] In the above configuration, when the holder is attached to the light source unit, the window side of the housing of the light source unit can be housed inside the side wall unit. Since a base for holding the optical branching unit is formed on the end wall unit, the laser light output from the window unit can be branched into a first laser light and a second laser light by the optical branching unit held by the base unit. Since an optical path for passing the second laser light to the optical detection unit side is formed in the side wall unit, the second laser light can be detected by the optical detection unit attached to the side surface of the side wall unit.

[0014] The side wall may have an outer surface provided with a notch having a first surface perpendicular to the optical path of the second laser light, and the light detection unit may be fixed to the first surface.

[0015] By attaching the light detecting unit to the notch, the attachment of the light detecting unit becomes easy and productivity improves.

[0016] The side wall portion may have a rectangular outer shape when viewed from the output direction of the laser light.

[0017] The flat sidewalls make it easier to attach the optical module to other components, improving productivity. The increased volume as a heat sink and larger contact area allow for efficient heat dissipation.

[0018] The end wall may have a first end wall and a second end wall, the first end wall and the second end wall being spaced apart across the optical path of the second laser beam. The first end wall may have a first inclined surface inclined with respect to the output direction of the laser beam, and the second end wall may have a second inclined surface inclined with respect to the output direction of the laser beam, and the first inclined surface and the second inclined surface may constitute the base.

[0019] The first end wall and the second end wall are spaced apart with the optical path of the second laser light therebetween, allowing the laser light and the second laser light to pass between them. The first and second inclined surfaces are formed on the first and second end wall, respectively, making it possible to ensure an area for arranging the optical branching unit. By fixing the optical branching unit to the first and second inclined surfaces, the optical branching unit can be arranged in a state inclined with respect to the output direction of the laser light.

[0020] The end wall portion may have a first region facing each other across the optical path of the second laser light and a second region facing each other across the optical branching portion. The distance between the second regions may be longer than the distance between the first regions. The first inclined surface and the second inclined surface may be surfaces connecting the first region and the second region.

[0021] With the above configuration, it is easy to fix the optical branching unit to the first inclined surface and the second inclined surface while ensuring an area for arranging the optical branching unit.

[0022] The light detection section may detect laser light in the visible region. The monitor unit is required to monitor the visible laser light from the light source section, and therefore the above-described configuration of the monitor unit is effective.

[0023] An optical module according to one embodiment may include the monitor unit and a light source to which the monitor unit is attached. The light source may include a semiconductor laser element that outputs the laser light, and a housing that houses the semiconductor laser element and has a window through which the laser light passes. The second open end may be fixed to a main surface of a support plate of the housing, and the side wall may house the window inside.

[0024] The optical module includes the monitor unit, so that the laser light output from the housing can be easily monitored.

[0025] A lens may be provided in the window portion. This configuration facilitates miniaturization of the light source portion, and as a result, facilitates miniaturization of the optical module.

[0026] The window may be provided with a window member that does not have a lens function. This configuration makes it possible to apply the optical system using a diverging beam.

[0027] The housing may have a lens component covering the window, and a window member having no lens function may be provided in the window. With this configuration, any lens component can be attached, thereby realizing a desired optical system.

[0028] The optical module according to one embodiment further includes a plurality of the semiconductor laser elements and a multiplexing section that multiplexes the laser beams output from the plurality of semiconductor laser elements, and the plurality of semiconductor laser elements and the multiplexing section may be housed in the package. In this case, for example, multiplexed laser beams of different colors can be output.

[0029] The plurality of laser beams may include a red laser beam, a blue laser beam, and a green laser beam, in which case the optical module functions as a three-color light source.

[0030] The optical module may include an optical fiber and a ferrule. With this configuration, the laser light can be optically coupled to the optical fiber, and the overall size of the optical module can be reduced.

[0031] [Details of the embodiments of the present disclosure] Specific examples of embodiments of the present disclosure will be described below with reference to the drawings. The present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims. In the description of the drawings, the same elements are given the same reference numerals, and duplicate explanations will be omitted.

[0032] FIG. 1 is a perspective view of an optical module according to a first embodiment. FIG. 2 is a perspective view of the optical module shown in FIG. 1 as viewed from below in FIG. 1. FIG. 3 is an exploded perspective view of the optical module shown in FIG. 1. FIG. 4 is a cross-sectional view of the optical module shown in FIG. 1 taken along line IV-IV. FIG. 5 is a front view of the optical module shown in FIG. 1. FIG. 6 is a rear view of the optical module shown in FIG. 1. FIG. 7 is a top view of the optical module shown in FIG. 1. FIG. 8 is a bottom view of the optical module shown in FIG. 1. FIG. 9 is a right side view of the optical module shown in FIG. 1, showing the optical module as viewed from the right side in FIG. 5. FIG. 10 is a left side view of the optical module shown in FIG. 1, showing the optical module as viewed from the left side in FIG. 5. FIG. 11 is a view of the monitor unit included in the optical module shown in FIG. 1 as viewed from below.

[0033] In the description of FIGS. 1 to 11, directions such as "up," "down," "right," and "left" are based on the state shown in FIG. 5 for convenience's sake.

[0034] The optical module 1A includes a light source section 2 that outputs laser light L, and a monitor unit 3 that detects a portion of the laser light L output from the light source section 2.

[0035] As shown in FIG. 4, the light source unit 2 outputs laser light L. In one embodiment, the light source unit 2 is a light source module capable of outputting laser light L in the visible region. In this embodiment, the light source unit 2 is a light source module capable of outputting laser light L including at least one of red laser light Lr, green laser light Lg, and blue laser light Lb. The light source unit 2 is, for example, a CAN-type light source module. The light source unit 2 has a first LD (first semiconductor laser element) 10a, a second LD (second semiconductor laser element) 10b, a third LD (third semiconductor laser element) 10c, a multiplexing unit 11, and a housing 20.

[0036] The first LD 10a is a semiconductor laser element that outputs red laser light Lr. An example of the oscillation wavelength (or center wavelength) of the red laser light Lr is not less than 620 nm and not more than 650 nm. The second LD 10b is a semiconductor laser element that outputs green laser light Lg. An example of the oscillation wavelength (or center wavelength) of the green laser light Lg is not less than 510 nm and not more than 540 nm. The third LD 10c is a semiconductor laser element that outputs blue laser light Lb. An example of the oscillation wavelength (or center wavelength) of the blue laser light Lb is not less than 435 nm and not more than 465 nm. Examples of the first LD 10a, the second LD 10b, and the third LD 10c are laser diode chips (LD chips).

[0037] The first LD 10a, the second LD 10b, and the third LD 10c are mounted on a support plate 12. The first LD 10a, the second LD 10b, and the third LD 10c may be mounted on the support plate 12 via a pedestal 13 (e.g., a submount). Examples of materials for the support plate 12 include metal and ceramic. The material for the pedestal 13 may be a material with a thermal expansion coefficient close to that of the semiconductor material constituting the first LD 10a, the second LD 10b, and the third LD 10c, such as AlN, SiC, Si, or diamond. When the pedestal 13 is used, the height of the pedestal 13 can be adjusted to adjust the heights of the red laser light Lr, the green laser light Lg, and the blue laser light Lb from the main surface 12a of the support plate 12 on which the first LD 10a, the second LD 10b, and the third LD 10c are mounted.

[0038] In the embodiment shown in Fig. 4, the second LD 10b and the third LD 10c are arranged laterally with respect to the optical axis of the first LD 10a. The second LD 10b and the third LD 10c are arranged on the same side with respect to the optical axis of the first LD 10a. In other words, the second LD 10b and the third LD 10c are arranged on the same side with respect to the output direction of the red laser light Lr from the first LD 10a, and are arranged so that the output directions of the green laser light Lg and the blue laser light Lb from the second LD 10b and the third LD 10c intersect (substantially perpendicular in Fig. 4) the output direction of the red laser light Lr.

[0039] 4, the optical axis of the first LD 10a (the output direction of the red laser light Lr) coincides with the optical axis A (see FIG. 3) of the light source unit 2. That is, the output direction of the laser light L from the light source unit 2 coincides with the output direction of the red laser light Lr.

[0040] The multiplexing unit 11 is configured to be able to multiplex the red laser light Lr, the green laser light Lg, and the blue laser light Lb. An example of the multiplexing unit 11 will be described based on the multiplexing unit 11 shown in Figure 4. The multiplexing unit 11 has a filter 11a and a filter 11b.

[0041] The filters 11a and 11b are, for example, wavelength-selective filters. In one embodiment, the filters 11a and 11b have multilayer filters (for example, dielectric multilayer filters) formed on a transparent substrate. An example of the transparent substrate is a glass plate. The transparent substrate may also be part of the filters 11a and 11b.

[0042] Filter 11a transmits red laser light Lr and reflects green laser light Lg from second LD 10b toward filter 11b. As a result, red laser light Lr and green laser light Lg are combined. Filter 11b transmits combined light of red laser light Lr and green laser light Lg (i.e., red laser light Lr and green laser light Lg) and reflects blue laser light Lb from third LD 10c to the opposite side from filter 11a. As a result, laser light L is obtained as combined light obtained by combining red laser light Lr, green laser light Lg, and blue laser light Lb.

[0043] The case where red laser light Lr, green laser light Lg, and blue laser light Lb are all output has been described. However, if any of red laser light Lr, green laser light Lg, and blue laser light Lb is not output, the laser light L is a light obtained by combining the laser lights of the output colors.

[0044] The filters 11a and 11b are mounted on the support plate 12 in an arrangement such that they generate a combined light of the red laser light Lr, the green laser light Lg, and the blue laser light Lb. At least one of the filters 11a and 11b may be mounted on the support plate 12 via a base 14.

[0045] The housing 20 accommodates the first LD 10a, the second LD 10b, and the third LD 10c. As shown in Figures 3 and 4, the housing 20 has a support plate 21 and a cover 22. In this embodiment, the housing 20 is a CAN-type housing.

[0046] As shown in FIG. 4, the support plate 21 is a member to which the support plate 12, on which the first LD 10a, the second LD 10b, the third LD 10c and the multiplexing unit 11 are mounted, is fixed. The support plate 12 is fixed to the support plate 21 so that the main surface 12a of the support plate 12 and the main surface 21a of the support plate 21 are perpendicular to each other. As a result, the laser light L is output in the normal direction of the main surface 21a of the support plate 21. The support plate 21 is, for example, a disk-shaped member. An example of the support plate 21 is a stem. Examples of materials for the support plate 21 include metal and ceramic.

[0047] A plurality of conductive members 23 extend through the support plate 21 in the thickness direction. In this embodiment, four conductive members 23 extend through the support plate 21. Each conductive member 23 is a rod-shaped member extending in one direction, such as a lead pin. Each conductive member 23 protrudes toward the main surface 21a of the support plate 21. The plurality of conductive members 23 are used for supplying power to the first LD 10a, the second LD 10b, and the third LD 10c, as GND lines, and the like. An insulating member 24 is disposed around the portion of each conductive member 23 located within the support plate 21 to prevent a short circuit between the conductive member 23 and the support plate 21.

[0048] 3 and 4, the cover 22 has a hollow side wall portion 221 that is open at both ends, and an end wall portion 222 that closes one of the open ends. A flange portion may be formed at the end of the side wall portion 221 that faces the support plate 21.

[0049] The cover 22 may be a cap (CAN cap) for the CAN-type housing 20. Of the open ends of the cover 22, the open end that is not blocked by the end wall portion 222 is fixed to the support plate 21. As a result, the cover 22 and the support plate 21 form an accommodation space that accommodates, for example, the first LD 10a, the second LD 10b, and the third LD 10c. The end wall portion 222 is hermetically sealed to the support plate 21, for example.

[0050] 4, an opening (window) 222a through which the laser light L passes is formed in the end wall portion 222. The laser light L is output to the outside of the housing 20 through the opening 222a. In this embodiment, a lens 25 is fitted in the opening 222a. In this embodiment, the lens 25 is a lens that converts the laser light L into convergent light, and is, for example, a spherical lens.

[0051] [Monitor unit] The monitor unit 3 is a unit for detecting a part of the laser light L output from the opening 222a. The monitor unit 3 has a light branching unit 3a, a light detecting unit 3b, and a holder 3c.

[0052] The optical branching unit 3a is disposed at an angle with respect to the output direction of the laser light L from the opening 222a (the direction of the optical axis A of the light source unit 2). In this embodiment, unless otherwise specified, the angle of inclination of the optical branching unit 3a with respect to the output direction of the laser light L is 45 degrees. The optical branching unit 3a splits the laser light L into a first laser light L1 and a second laser light L2.

[0053] The first laser light L1 is a portion of the laser light L that travels along the output direction of the laser light L, and is output light from the optical module 1.

[0054] The second laser light L2 is a portion of the laser light L that travels in a direction different from the output direction of the laser light L. In other words, the second laser light L2 is a light that is a part of the laser light L reflected by the optical branching unit 3a. The second laser light L2 is light (monitor light) for inspecting whether the red laser light Lr, green laser light Lg, and blue laser light Lb are being output in the desired output state from the first LD 10a, the second LD 10b, and the third LD 10c.

[0055] As described above, the first laser light L1 is output light from the optical module 1, and the second laser light L2 is light for inspection. Therefore, the amount of light of the first laser light L1 is greater than that of the second laser light L2. An example of the reflectance of the laser light L at the optical branching unit 3a is 5% to 15%.

[0056] An example of the optical branching unit 3a is a glass plate, in which case the second laser light L2 is obtained by Fresnel reflection on the surface of the glass plate.

[0057] The photodetector 3b is disposed on the optical path of the second laser light L2. The photodetector 3b includes at least one of a first photodetector 31a, a second photodetector 31b, and a third photodetector 31c arranged in parallel. An example of the first photodetector 31a, the second photodetector 31b, and the third photodetector 31c is a photodiode. A first filter 32a, a second filter 32b, and a third filter 32c are disposed on the incident surface side of the first photodetector 31a, the second photodetector 31b, and the third photodetector 31c on which the second laser light L2 is incident. The first filter 32a, the second filter 32b, and the third filter 32c are filters that selectively pass the red laser light Lr, the green laser light Lg, and the blue laser light Lb. In such a configuration, the first photodetector 31a detects the red laser light Lr of the second laser light L2, the second photodetector 31b detects the green laser light Lg of the second laser light L2, and the third photodetector 31c detects the blue laser light Lb of the second laser light L2.

[0058] The first photodetector 31a, the second photodetector 31b, and the third photodetector 31c are electrically connected to a control device (not shown). The control device controls the first LD 10a, the second LD 10b, and the third LD 10c according to the detection results of the first photodetector 31a, the second photodetector 31b, and the third photodetector 31c so that the red laser light Lr, the green laser light Lg, and the blue laser light Lb of the laser light L are in a desired state (desired light intensity, etc.).

[0059] The light detection unit 3b has a housing 33 that houses a first photodetector 31a, a second photodetector 31b, and a third photodetector 31c. A window 33a for passing the second laser light L2 is formed in the wall of the housing 33 on the incident side of the second laser light L2. The window 33a can be formed by fitting a transparent window member (for example, a glass plate) into an opening formed in the housing 33. An example of the shape of the window 33a is rectangular, as shown in FIG. 5. The shape of the window 33a may be square or circular.

[0060] In the above embodiment, the photodetector unit 3b includes a first photodetector 31a, a second photodetector 31b, and a third photodetector 31c. However, the photodetector unit 3b may include only one photodetector. In this case, the incident surface of the photodetector for the second laser light L2 is virtually divided into a first region, a second region, and a third region, and the red laser light Lr, the green laser light Lg, and the blue laser light Lb are detected in the first region, the second region, and the third region. In this embodiment, a first filter 32a, a second filter 32b, and a third filter 32c are disposed in the first region, the second region, and the third region.

[0061] The holder 3c is a member to which the optical branching unit 3a and the optical detection unit 3b are fixed, and is attached to the housing 20. The holder 3c functions as an adapter for arranging the optical branching unit 3a and the optical detection unit 3b relative to the light source unit 2. The holder 3c has a hollow side wall portion 41 (hollow body) and an end wall portion 42.

[0062] As shown in FIGS. 4 and 11, the side wall portion 41 is a hollow member (hollow body) capable of accommodating the portion of the housing 20 on the opening 222a side therein. The side wall portion 41 accommodates the window portion 33a therein. In this embodiment, the side wall portion 41 is cylindrical. An example of a material for the side wall portion 41 is metal (e.g., stainless steel (SUS)). One example of the side wall portion 41 is a cylindrical metal sleeve.

[0063] The side wall portion 41 has a first open end 411 and a second open end 412. The second open end 412 is the end opposite to the first open end 411. The side wall portion 41 is fixed to the housing 20 by joining the second open end 412 to the main surface 21a of the support plate 21 of the housing 20. The side wall portion 41 can be fixed to the support plate 21 by, for example, resistance welding or laser welding. The side wall portion 41 may be joined to the support plate 21 with an adhesive or may be joined to the support plate 21 using solder.

[0064] A step portion (or notch) 413 recessed toward the central axis of the side wall portion 41 is formed on the outer surface 41a of the side wall portion 41 on the side of the first open end 411. The step portion 413 functions as a portion on which the light detection unit 3b is mounted (light detection unit mounting portion). The step portion 413 has a first surface 413a that intersects with the optical path of the second laser light L2 and a second surface 413b that intersects with the first surface 413a. In one embodiment, the first surface 413a is perpendicular to the optical path of the second laser light L2, and the second surface 413b is perpendicular to the first surface 413a. The first surface 413a is a surface to which the light detection unit 3b is fixed, and in one embodiment, the first surface 413a is a flat surface. By arranging the light detecting unit 3b on the step portion 413, when viewed from the output direction of the laser light L, the size of the protruding portion (projecting portion) of the light detecting unit 3b from the side wall portion 41 can be reduced.

[0065] A recess 414 is formed in a part of the side wall 41 (specifically, the part where the step 413 is formed), recessed from the first open end 411 toward the second open end 412. The recess 414 functions as a light path for passing the second laser light L2.

[0066] In the side wall 41, a recess 415 recessed from the first open end 411 toward the second open end 412 may be formed in the region facing the recess 414. Unless otherwise specified, the following describes an embodiment in which the recess 415 is formed.

[0067] The end wall portion 42 is provided at the first open end 411. A base portion 44 is formed on the end wall portion 42 to hold the optical branching portion 3a in a tilted state with respect to the output direction of the laser light L from the opening 222a. An example of the end wall portion 42 will be specifically described.

[0068] The end wall portion 42 has a first end wall portion 421 and a second end wall portion 422. As shown in Fig. 7, the first end wall portion 421 and the second end wall portion 422 are arranged apart from each other so as to sandwich the optical path of the second laser light L2 (or the recess 414). In Fig. 7, the second laser light L2 is indicated by a dashed line to indicate the optical path of the second laser light L2.

[0069] The first end wall 421 has a first step 421a toward the second end wall 422 to ensure an area for arranging the optical branching unit 3a. The first step 421a is a recessed portion of the first end wall 421 that is away from the second end wall 422. The first end wall 421 has a first step surface (first inclined surface) 44a that is inclined with respect to the output direction of the laser light L.

[0070] The second end wall 422 has a second step portion 422a facing the first end wall 421 to ensure an area for arranging the optical branching unit 3a. The second step portion 422a is a recessed portion that is spaced apart from the first end wall 421. The second end wall 422 has a second step surface (second inclined surface) 44b that is inclined with respect to the output direction of the laser light L. The inclination angle of the second step surface 44b with respect to the output direction of the laser light L is the same as the inclination angle of the first step surface 44a with respect to the output direction of the laser light L.

[0071] In the configuration of the first end wall portion 421 and the second end wall portion 422, the opposing surfaces of the first end wall portion 421 and the second end wall portion 422 have a first region 42a and a second region 42b. The first regions 42a face each other across the optical path of the second laser light L2. The second regions 42b face each other across the optical branching unit 3a. The first region 42a is closer to the optical detection unit 3b than the second region 42b. As shown in FIG. 7 , the distance d2 between the first end wall portion 421 and the second region 42b of the second end wall portion 422 is longer than the distance d1 between the first region 42a of the first end wall portion 421 and the second region 42b of the second end wall portion 422. The distance d2 is a length that allows the optical branching unit 3a to be disposed between the first end wall portion 421 and the second region 42b of the second end wall portion 422.

[0072] The surface of the first end wall portion 421 connecting the first region 42a and the second region 42b is inclined with respect to the output direction of the laser light L and corresponds to the first step surface 44a. The surface of the second end wall portion 422 connecting the first region 42a and the second region 42b is inclined with respect to the output direction of the laser light L and corresponds to the second step surface 44b.

[0073] The optical branching unit 3a is fixed to the first step surface 44a and the second step surface 44b. That is, the first step surface 44a and the second step surface 44b function as the base 44. Therefore, the optical branching unit 3a is formed to be located on the optical path of the laser light L. If the optical branching unit 3a is plate-shaped, such as a glass plate, the inclination angles of the first step surface 44a and the second step surface 44b substantially match the inclination angle of the optical branching unit 3a with respect to the output direction of the laser light L. The optical branching unit 3a can be fixed to the first step surface 44a and the second step surface 44b using an adhesive or solder.

[0074] In the monitor unit 3, the optical branching unit 3a and the optical detection unit 3b are fixed to a holder 3c. The optical detection unit 3b detects the second laser light L2 from the optical branching unit 3a. Therefore, the step portion 413 for fixing the optical detection unit 3b and the base portion 44 to which the optical branching unit 3a is fixed (specifically, the first step surface 44a and the second step surface 44b) are formed so that the optical branching unit 3a and the optical detection unit 3b are held in an aligned state by the holder 3c so that the second laser light L2 is incident on the optical detection unit 3b.

[0075] The holder 3c can be manufactured, for example, as follows. First, a first member is manufactured, which has a side wall portion 41 and an end wall portion that completely closes the first open end 411 of the side wall portion 41. The first member can be manufactured, for example, using an NC lathe. Then, the first member is processed to form, for example, a step portion 413 for disposing the light detection unit 3b, and a first step portion 421a and a second step portion 422a (including the base portion 44) for disposing the light branching unit 3a. This results in the holder 3c. After the holder 3c is manufactured, the light branching unit 3a is fixed to the base portion 44 (specifically, the first step surface 44a and the second step surface 44b), and the light detection unit 3b is fixed to the step portion 413. This results in the monitor unit 3.

[0076] Because the side wall 41 of the monitor unit 3 is hollow, the window 33a and the cover 22 can be accommodated inside the side wall 221. The optical branching unit 3a is held on a base 44 formed on the end wall 42, and by accommodating the window 33a and the cover 22 inside the side wall 41, the laser light L is incident on the optical branching unit 3a. Therefore, the laser light L can be branched into the first laser light L1 and the second laser light L2 by the optical branching unit 3a. Because the side wall 41 has a recess 414 for passing the second laser light L2, the optical detection unit 3b can detect the second laser light L2 even if the optical detection unit 3b is fixed to the outer surface 41a of the side wall 41.

[0077] In the monitor unit 3, the optical branching unit 3a and the optical detection unit 3b are fixed in a state in which they are aligned with respect to the side wall 41. Therefore, by covering the side wall 41 with the cover 22 and fixing it to the support plate 21, the positions of the optical branching unit 3a and the optical detection unit 3b with respect to the light source unit 2 are automatically determined. Therefore, when monitoring the laser light L output from the light source unit 2 outside the light source unit 2, the optical detection unit 3b can be easily positioned, and as a result, the laser light L can be easily monitored outside the light source unit 2.

[0078] The tilt angle of the optical branching unit 3a is fixed, and the optical branching unit 3a has a size sufficient to branch the laser light L. Therefore, even if the laser light L does not necessarily pass through the center of the optical branching unit 3a, the laser light L can be branched into the first laser light L1 and the second laser light L2, and the second laser light L2 can be detected by the photodetector 3b.

[0079] In a configuration in which the end wall portion 42 has a first end wall portion 421 and a second end wall portion 422, they are spaced apart with the optical path of the second laser light L2 between them, allowing the laser light L and the second laser light L2 to pass between the first end wall portion 421 and the second end wall portion 422. The first end wall portion 421 and the second end wall portion 422 have a first step portion 421a and a second step portion 422a formed therein, thereby ensuring an area for arranging the optical branching unit 3a. The first step surface 44a and the second step surface 44b are inclined surfaces, and by fixing the optical branching unit 3a to them, the optical branching unit 3a can be arranged in an inclined state with respect to the output direction of the laser light L.

[0080] In the embodiment in which the recess 415 is formed in the side wall 41, the area from the arrangement position of the optical branching unit 3a to the recess 415 in the monitor unit 3 is open as shown in Fig. 1. Therefore, it is easy to fix the optical branching unit 3a to the base 44.

[0081] In the optical module 1, the light source section 2 does not have a light detection section that monitors the optical output states of the first LD 10a, the second LD 10b, and the third LD 10c. Even with this type of light source section 2, by covering the monitor unit 3 with the cover 22 and fixing it to the support plate 21, it is possible to easily align the light detection section 3b with the light source section 2 as described above and detect a portion of the laser light L (second laser light L2). As a result, the first LD 10a, the second LD 10b, and the third LD 10c can be controlled to desired output states.

[0082] In the optical module 1, there is no need to place a photodetector that monitors the optical output states of the first LD 10a, the second LD 10b, and the third LD 10c inside the housing 20. This makes it possible to reduce the size of the light source unit 2, and as a result, the size of the optical module 1. For example, the configuration of the optical module 1 and the monitor unit 3 is effective when the optical module 1 is mounted on a wearable device such as smart glasses.

[0083] In the optical module 1 described in this embodiment, the lens 25 is attached to the cover 22. Therefore, for example, it is not necessary to arrange a lens or the like for converging or collimating laser light in the accommodation space for the first LD 10a, the second LD 10b, and the third LD 10c inside the cover 22. This also contributes to the miniaturization of the light source unit 2.

[0084] Since there is no need to place a photodetector that monitors the optical output states of the first LD 10a, the second LD 10b, and the third LD 10c inside the housing 20, the design of the light source unit 2 is easy and there is no need for optical axis adjustment, which is required when the above photodetector is provided. Therefore, the light source unit 2 is easy to manufacture, and as a result, the optical module 1 can be easily manufactured.

[0085] The optical module 1 can be easily manufactured by, for example, attaching the monitor unit 3 to a CAN-type light source module (the light source section 2 in this embodiment) that does not have a photodetector for monitoring the optical output states of the first LD 10 a, the second LD 10 b, and the third LD 10 c as described above. Therefore, the optical module 1 is easy to manufacture.

[0086] It is known that in laser diodes (LDs) that output laser light in the visible region, the optical power of the laser light output forward and backward is not proportional. Therefore, when monitoring the visible laser light output from the LD, the laser light output forward must be split by an optical branching unit and detected by an optical detector. Therefore, if an optical detector is placed in the light source unit 2 to monitor the output states of the red laser light Lr, green laser light Lg, and blue laser light Lb output from the first LD 10a, second LD 10b, and third LD 10c, an optical branching unit is also placed in the light source unit 2 in addition to the optical detector.

[0087] In contrast to this, as described above, in the configuration of the optical module 1 and the monitor unit 3, the monitoring light detection unit 30 can be disposed outside the light source unit 2, thereby reducing the size of the light source unit 2. As a result, the optical module 1 and the monitor unit 3 are effective when the light source unit 2 includes an LD that outputs laser light in the visible region.

[0088] While the light source unit 2 does not have a light detection unit, the monitor unit 3 has a light detection unit 3b. Therefore, there is no need to pass the conductive member 23 for light detection through the support plate 21 of the housing 20. In other words, the number of conductive members 23 that need to be passed through the support plate 21 can be reduced. Because the monitor unit 3 has the light detection unit 3b, it is easy to use, for example, a flexible printed circuit board (FPC). Because the monitor unit 3 has the light detection unit 3b, it is also easy to replace the light detection unit 3b.

[0089] In a configuration in which the light source unit 2 includes the first LD 10a, the second LD 10b, the third LD 10c, and the multiplexing unit 11, the laser light L can include red laser light Lr, green laser light Lg, and blue laser light Lb. Therefore, the optical module 1 including the light source unit 2 can be used as a three-color light source module.

[0090] (Second embodiment) A second embodiment of the optical module will be described with reference to Fig. 12 to Fig. 14. Fig. 12 is a perspective view showing another embodiment of the optical module. Fig. 13 is an exploded perspective view of the optical module shown in Fig. 12. Fig. 14 is a cross-sectional view taken along line XIV-XIV of the optical module shown in Fig. 12.

[0091] 12 to 14 includes a light source section 2A and a monitor unit 3. The monitor unit 3 included in the optical module 1A is the same as the monitor unit 3 described in the first embodiment, and therefore a description thereof will be omitted.

[0092] Light source unit 2A differs from light source unit 2 mainly in that opening 222a does not have a lens and that window member 26 without lens function is attached to opening 222a. Other than these differences, the configuration of optical module 1A is the same as that of optical module 1, so only the above differences will be described and a description of the other configurations will be omitted.

[0093] 14, in the optical module 1A, a window member 26 is fixed to the inner surface of the end wall portion 222 of the cover 22 so as to block the opening 222a of the end wall portion 222 from the inside. An example of the window member 26 is a glass plate. The window member 26 may be fitted into the opening 222a. The window member 26 may be fixed to the outer surface of the end wall portion 222 so as to block the opening 222a of the cover 22 from the outside. In an embodiment having the window member 26, the window member 26, together with the opening 222a, may be part of the window portion.

[0094] Optical module 1A has the same configuration as optical module 1, except that it has light source unit 2A instead of light source unit 2. Furthermore, light source unit 2A has the same configuration as light source unit 2, except that it does not have lens 25 and that window member 26 is attached to opening 222a. Therefore, optical module 1A has the same effects as optical module 1.

[0095] (Third embodiment) A third embodiment of the optical module will be described with reference to Fig. 15 to Fig. 17. Fig. 15 is a perspective view showing an optical module according to the third embodiment. Fig. 16 is an exploded perspective view of the optical module shown in Fig. 15. Fig. 17 is a cross-sectional view taken along line XVII-XVII of the optical module shown in Fig. 15.

[0096] 15 to 17 includes a light source section 2B and a monitor unit 3. The monitor unit 3 included in the optical module 1B is the same as the monitor unit 3 described in the first embodiment, and therefore a description thereof will be omitted.

[0097] Light source unit 2 differs from light source unit 2 mainly in that window member 26 that does not have a lens function is attached to opening 222a, and that a lens component is attached to the outer surface of end wall portion 222 instead of lens 25. Other than these differences, the configuration of optical module 1B is the same as that of optical module 1, so only the above differences will be described and a description of the other configurations will be omitted.

[0098] 17, in the optical module 1B, similar to the optical module 1A of the second embodiment, a window member 26 is fixed to the inner surface of the end wall portion 222 so as to block the opening 222a of the cover 22 from the inside. An example of the window member 26 is a glass plate. The window member 26 may be fitted into the opening 222a.

[0099] Lens component 27 has lens 27a. Lens component 27 may have holder 27b that holds lens 27a. In the embodiment shown in FIG. 17 , lens 27a is fitted into holder 27b and fixed to the outer surface of end wall portion 222. Lens 27a is provided so as to cover window member 26. Holder 27b may be fixed to end wall portion 222 via plate-shaped base portion 28. In this case, base portion 28 has an opening corresponding to opening 222a. An example of lens 27a is a collimating lens that collimates first laser beam L1. Lens component 27 may have, for example, multiple lenses, and the multiple lenses may achieve the collimating function. Lens component 27 may have a function of converting first laser beam L1 into light other than collimated light (for example, convergent light).

[0100] Optical module 1B has the same configuration as optical module 1, except that it has light source unit 2B instead of light source unit 2. Furthermore, light source unit 2B has the same configuration as light source unit 2, except that window member 26 without lens function is attached to opening 222a and lens component 27 is attached to the outer surface of end wall portion 222 instead of lens 25. Therefore, optical module 1B has the same effects as optical module 1A.

[0101] When the lens component 27 has a collimating function, the light source unit 2B outputs collimated laser light L. Therefore, the optical module 1B can also output the first laser light L1 as collimated light.

[0102] (Fourth embodiment) An optical module according to the fourth embodiment will be described with reference to FIGS. 18 to 27. FIG. 18 is a perspective view showing an optical module according to the fourth embodiment. FIG. 19 is a perspective view of the optical module shown in FIG. 18 when viewed from below in FIG. 18. FIG. 20 is an exploded perspective view of the optical module shown in FIG. 18. FIG. 21 is a cross-sectional view of the optical module shown in FIG. 18 taken along line XXI-XXI. FIG. 22 is a front view of the optical module shown in FIG. 18. FIG. 23 is a rear view of the optical module shown in FIG. 18. FIG. 24 is a top view of the optical module shown in FIG. 18. FIG. 25 is a bottom view of the optical module shown in FIG. 18. FIG. 26 is a right side view of the optical module shown in FIG. 18. FIG. 27 is a left side view of the optical module shown in FIG. 18.

[0103] In the explanation of FIGS. 18 to 27, directions such as "up," "down," "right," and "left" are based on the state shown in FIG. 22 for the sake of convenience.

[0104] 18 to 27 includes a light source section 2A and a monitor unit 3A. The light source section 2A included in the optical module 1C is the same as the light source section 2A described in the second embodiment, and therefore a description thereof will be omitted.

[0105] The monitor unit 3A has an optical branching unit 3a, an optical detection unit 3b, and a holder 3c A. The configurations of the optical branching unit 3a and the optical detection unit 3b are the same as those in the monitor unit 3 described in the first embodiment, and therefore a description thereof will be omitted.

[0106] The holder 3cA differs from the holder 3c described in the first embodiment mainly in that it has a side wall portion 41A instead of the side wall portion 41.

[0107] The side wall portion 41A in the fourth embodiment differs from the side wall portion 41 in that, as shown in, for example, FIGS. 18, 20, and 24, its outer shape when viewed from the output direction of the laser light L is quadrangular (for example, square or rectangular). One example of the side wall portion 41A is a rectangular sleeve with a quadrangular outer shape. Like the side wall portion 41, the side wall portion 41A has a first open end 411 and a second open end 412, and is hollow so as to be able to accommodate the opening 222a side (the portion of the cover 22) of the housing 20. In this embodiment, the inner shape of the side wall portion 41A when viewed from the output direction of the laser light L is circular corresponding to the shape of the cover 22, but may be rectangular as long as it can accommodate the portion of the cover 22.

[0108] The side wall portion 41A has a second open end 412 fixed to the support plate 21 in the same manner as in the first embodiment.

[0109] Similar to the side wall 41, the side wall 41A is formed with a step 413 for attaching the light detection unit 3b and a recess 414 for passing the second laser light L2. Because the outer shape of the side wall 41A is rectangular as described above, the step 413 is also a notch formed by cutting out a corner defined by one side surface 41b of the side wall 41A and the end wall 42A. Similar to the side wall 41, the side wall 41A may be formed with a recess 415 on the side opposite the recess 414. The recess 415 makes it easy to attach the optical branching unit 3a to the side wall 41A.

[0110] An end wall 42A is provided at the first open end 411 of the side wall 41A. The end wall 42A has the same configuration as the end wall 42, except that the shape of the boundary between the end wall 42A and the side wall 41A differs from that in the first embodiment in accordance with the shape of the side wall 41A. Therefore, a base 44 that holds the optical branching unit 3a is formed on the end wall 42A.

[0111] In the fourth embodiment, the end wall portion 42A may also have a first end wall portion 421A and a second end wall portion 422A. The arrangement of the first end wall portion 421A and the second end wall portion 422A is the same as that of the first end wall portion 421 and the second end wall portion 422 in the first embodiment. The configurations of the first end wall portion 421A and the second end wall portion 422A are the same as those of the first end wall portion 421 and the second end wall portion 422 in the first embodiment, except that the shapes of the boundary portions between the side wall portion 41A and the first end wall portion 421A and the boundary portions between the side wall portion 41A and the second end wall portion 422A differ from those of the first end wall portion 421 and the second end wall portion 422 in the first embodiment, depending on the shape of the side wall portion 41A. Therefore, a description of the first end wall portion 421A and the second end wall portion 422A will be omitted.

[0112] The optical module 1C is the same as the optical module 1A according to the second embodiment, except that it uses a monitor unit 3A instead of the monitor unit 3. The monitor unit 3A has substantially the same configuration as the monitor unit 3, except that the outer shape of the side wall portion 41A when viewed from the output direction of the laser light L is rectangular. Therefore, the optical module 1C has the same effects as the optical module 1A (corresponding to the same effects as the optical module 1).

[0113] (Fifth embodiment) An optical module according to the fifth embodiment will be described with reference to Fig. 28 and Fig. 29. Fig. 28 is a perspective view showing the optical module according to the fifth embodiment. Fig. 29 is an exploded perspective view of the optical module shown in Fig. 28.

[0114] The optical module 1D shown in FIGS. 28 and 29 is a pigtail-type optical module having an optical output unit 4, an optical transmission medium 50, and a ferrule holder 60.

[0115] The optical output unit 4 is the optical module 1 according to the first embodiment, and outputs a first laser light L1. That is, the optical output unit 4 has a light source unit 2 and a monitor unit 3, and the monitor unit 3 is fixed to the light source unit 2. The configurations of the light source unit 2 and the monitor unit 3 are the same as those in the first embodiment. Therefore, a description of the light source unit 2 and the monitor unit 3 will be omitted.

[0116] As shown in FIG. 29, the light output unit 4, the ferrule holder 60, and the optical transmission medium 50 are arranged along the optical axis A of the light output unit 4 (the axis along the output direction of the first laser light L1).

[0117] The optical transmission medium 50 receives the first laser light L1 output from the optical output unit 4. The optical transmission medium 50 includes an optical fiber 51 and a ferrule 52.

[0118] The ferrule 52 is a hollow rod-shaped member. The ferrule 52 holds the optical fiber 51 by inserting the optical fiber 51 into the ferrule 52. An example of a material for the ferrule 52 is metal. A flange portion 53 (or a skirt portion) that determines the insertion amount of the ferrule 52 into the ferrule holder 60 may be provided on the outer periphery of the end portion 52a of the ferrule 52 on the ferrule holder 60 side. The flange portion 53 may be integrated with the ferrule 52. A protective cover 54 that protects the vicinity of the insertion port of the ferrule 52 for the optical fiber 51 (the end portion opposite the ferrule holder 60) may be attached to the ferrule 52 together with the ferrule 52. The protective cover 54 is, for example, a rubber boot, and is placed over the ferrule 52.

[0119] The ferrule holder 60 has a side wall portion 61 and an end wall portion 62. The ferrule holder 60 is a member that attaches the ferrule 52 to the optical output unit 4 (optical module 1). The ferrule holder 60 can also function as a member that aligns the optical axis of the optical fiber 51 with the optical axis of the optical output unit 4.

[0120] The side wall 61 has a hollow shape with both ends open. The side wall 61 is placed over the side wall 41 of the monitor unit 3 of the light output unit 4. The side wall 61 only needs to have a shape that can accommodate the side wall 41 inside and that can align the optical axis of the optical fiber 51 with the optical axis of the light output unit 4 by placing the side wall 61 over the side wall 41.

[0121] For example, when the side wall portion 41 is cylindrical as described in the first embodiment, the side wall portion 61 may also be cylindrical. In this case, the inner diameter of the side wall portion 61 substantially matches the outer diameter of the side wall portion 41. As a result, by covering the side wall portion 41 with the side wall portion 61, the inner surface of the side wall portion 61 and the outer surface of the side wall portion 41 come into contact, and the position of the side wall portion 61 relative to the side wall portion 41 is uniquely determined. Therefore, by covering the side wall portion 41 with the side wall portion 61, it is possible to align the optical axis of the optical fiber 51 with the optical axis of the light output portion 4.

[0122] A recess 61a is formed in part of the side wall 61, recessed from the open end on the light output unit 4 side toward the opposite side, in order to avoid interference with the light detection unit 3b.

[0123] The end wall 62 is provided so as to close the open end of the side wall 61 on the optical transmission medium 50 side. The end wall 62 has an opening 62a formed therein, which allows the first laser light L1 to pass through and into which the end 52a of the ferrule 52 is fitted. The inner diameter of the opening 62a substantially matches the outer diameter of the end 52a. The opening 62a is formed at a position where the optical axis A of the light output unit 4 and the optical axis of the optical fiber 51 coincide with each other when the ferrule holder 60 is placed over the side wall 221 and the end 52a is fitted into the opening 62a.

[0124] In the above configuration, the optical axis A of the light output unit 4 can be aligned with the optical axis of the optical fiber 51 by fitting the end 52a of the ferrule 52 into the opening 62a and then placing the ferrule holder 60 over the side wall portion 41.

[0125] The optical module 1D includes the optical output section 4 which is the optical module 1 of the first embodiment. Therefore, the optical module 1D has the same effects as the optical module 1 and the monitor unit 3.

[0126] Although various embodiments have been described above, the present disclosure is not limited to the above embodiments. For example, the number of semiconductor laser elements included in the light source unit may be one or two. The number of semiconductor laser elements included in the light source unit may be four or more. The semiconductor laser elements are not limited to laser diodes.

[0127] The various embodiments described above may be combined as appropriate without departing from the spirit of the present disclosure. [Explanation of symbols]

[0128] 1 Optical Module 1A Optical Module 1B Optical Module 1C Optical Module 1D Optical Module 2 Light source section 2A light source section 2B Light source section 3 Monitor Unit 3A monitor unit 3a Optical branching section 3b Photodetector 3c holder 3cA holder 4 Optical output section 10a First LD (first semiconductor laser element) 10b Second LD (second semiconductor laser element) 10c Third LD (third semiconductor laser element) 11. Multiplexing section 12 Support plate 13 Daibu 12a Main surface 11a filter 11b filter 14 Base 20 Case 21 Support plate 21a Main surface 22 Cover 221 Side wall 222 End wall 222a Opening (window) 23 Conductive material 24 Insulating material 25 lenses 26 Window material (window part) 27 Lens parts 27a Lens 27b Holder 28 Daibu 30 Light detection unit 31a First photodetector 31b Second photodetector 31c Third photodetector 32a First filter 32b Second filter 32c 3rd filter 33 Case 33a Window section 41 Side wall 41A Side wall part 411 First open end 412 Second open end 413 Step (notch) 413a Page 1 413b 2nd side 414 recess 415 Recess 41a Exterior 41b Side 42 End wall 42A End wall 421 First end wall 421A 1st end wall 421a First step 422 Second end wall 422A Second end wall 422a Second step 42a 1st area 42b 2nd area 44 Base 44a 1st step surface (1st slope surface) 44b 2nd step surface (2nd slope surface) 50 Optical transmission medium 51 Optical Fiber 52 Ferrule 52a end 53 Flange 54 Protective cover 60 Ferrule holder 61 Side wall 61a Recess 62a aperture 62 End wall A optical axis d2 distance d1 distance L laser light L1 First laser beam L2 Second laser beam Lr Red laser light Lg green laser light Lb Blue laser light

Claims

1. A holder and a light branching unit that branches the laser light into a first laser light and a second laser light; a light detection unit that detects the second laser light; Equipped with the optical branching unit and the optical detection unit are fixed to the holder so that the second laser light is incident on the optical detection unit; The holder is a first open end and a second open end; A hollow side wall portion; an end wall portion provided at the first open end; and a base portion is formed on the end wall portion to hold the optical branching portion in a state inclined with respect to an output direction of the laser light, the light detection unit is attached to an outer surface of the side wall portion on an optical path of the second laser light, An optical path for passing the second laser light toward the light detection unit is formed in the side wall portion. Monitor unit.

2. a notch having a first surface orthogonal to the optical path of the second laser light is provided on an outer surface of the side wall; The light detection unit is fixed to the first surface. The monitor unit according to claim 1 .

3. The monitor unit according to claim 1 , wherein the side wall portion has a rectangular outer shape when viewed from the output direction of the laser light.

4. The end wall portion has a first end wall portion and a second end wall portion, the first end wall portion and the second end wall portion are spaced apart across the optical path of the second laser light, the first end wall portion has a first inclined surface inclined with respect to the output direction of the laser light, the second end wall portion has a second inclined surface inclined with respect to the output direction of the laser light, the first inclined surface and the second inclined surface constitute the platform portion; The monitor unit according to any one of claims 1 to 3.

5. the end wall portion has a first region facing each other across the optical path of the second laser light and a second region facing each other across the optical branching portion, the distance between the second regions is greater than the distance between the first regions; the first inclined surface and the second inclined surface are surfaces connecting the first region and the second region; The monitor unit according to claim 4.

6. The light detection unit detects laser light in the visible region. The monitor unit according to claim 1 .

7. The monitor unit according to claim 1; a light source unit to which the monitor unit is attached, The light source unit is a semiconductor laser element that outputs the laser light; a housing that houses the semiconductor laser element and has a window that allows the laser light to pass through, the second open end is fixed to a main surface of a support plate of the housing, The side wall portion accommodates the window portion therein. Optical module.

8. A lens is provided in the window portion.

8. The optical module according to claim 7.

9. A window member having no lens function is provided in the window portion.

8. The optical module according to claim 7.

10. the housing has a lens component that covers the window portion, A window member having no lens function is provided in the window portion.

8. The optical module according to claim 7.

11. A plurality of the semiconductor laser elements; a multiplexing unit that multiplexes a plurality of laser beams output from a plurality of the semiconductor laser elements; Further provided with the plurality of semiconductor laser elements and the multiplexing unit are housed in the housing; The optical module according to any one of claims 7 to 10.

12. the plurality of laser beams include red laser beams, blue laser beams, and green laser beams; The optical module according to claim 11.

13. The optical module according to claim 7 , comprising an optical fiber and a ferrule.

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