JP6440469B2 - Laser synthesis optical device - Google Patents

Description

  The present invention relates to a laser synthesizing optical apparatus, for example, a laser synthesizing optical apparatus that combines laser beams to realize a high-power laser used as a light source for a projector or the like. More specifically, the present invention relates to an optical coupling method for synthesizing a plurality of laser diodes having a plurality of light emitting points (hereinafter referred to as multi-emitter LDs) and increasing the output thereof.

  Conventionally, a high-pressure mercury lamp or the like has been used as a light source for a projection display device such as a projector. The emission spectrum of the lamp is substantially continuous visible light due to the nature of the substance enclosed therein. The lamp light is further separated into three colors, red, green and blue, in order to produce an optimal color for the display device. Then, by illuminating the small display device, a full-color image is formed by recombining the light.

  In recent years, development of projection display devices using a laser diode (hereinafter also referred to as LD) as a light source instead of a lamp has been actively developed. The projection display device using an LD as a light source is characterized in that the color reproduction range can be expanded by monochromaticity of laser light and the entire optical system can be downsized due to a small light emitting point. In addition, when each color LD of red, green, and blue is used, since each color is controlled independently, an optical system for color separation as in the case of using a lamp as a light source is not required.

  However, a single LD has a low light output for use as a light source for a projection display device. In particular, a sufficient amount of light cannot be obtained in applications where a large screen is projected. For this reason, for example, a means for realizing a high output by synthesizing a plurality of laser modules as shown in Patent Document 1 has been proposed.

  Further, Patent Document 2 proposes a method of condensing the output light of a multi-emitter laser diode having a plurality of light emitting points (hereinafter also referred to as multi-emitter LD) and fiber coupling. Patent Documents 3 and 4 show LD combining methods using beam combining elements.

JP 2000-241659 A JP 2002-202442 A JP 2001-142014 A JP-A-11-153733

  However, in Patent Document 1 described above, since a plurality of laser modules are combined, it is difficult to reduce the size of the apparatus. Further, Patent Document 2 shows a configuration for condensing a single multi-emitter LD, but it is difficult to synthesize a plurality of LDs with this configuration.

  Further, as the beam combining elements of Patent Document 3 and Patent Document 4, a polarizing prism, a dichroic prism, a mirror, a half mirror, or the like is shown. However, in order to use this beam combining element, lasers having mutually different polarizations or different wavelengths are required. For this reason, it is difficult to synthesize a plurality of lasers having the same polarization direction and the same wavelength.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a laser combining optical device that can combine laser beams from a plurality of multi-emitter LDs with a simple configuration. .

A laser synthesizing optical device according to the present invention includes at least one multi-emitter laser diode, a plurality of collimator lenses disposed on the light emission surface side of each of the plurality of multi-emitter laser diodes, and two total reflection surfaces. Laser light emitted from one multi-emitter laser diode is sequentially reflected by the two total reflection surfaces of the reflective element, and emitted from another multi-emitter laser diode and reflected. It shifts in the direction approaching the laser beam that is transmitted without reflecting the element .

According to the laser combining optical device according to the present invention, the laser beam emitted from a single multi-emitter laser diode, the reflective element, the laser beam you transmitted without being reflected reflective elements is emitted from another multi-emitter diode Shift in the direction of approach. For this reason, the interval between the laser beam emitted from another multi-emitter laser diode and the laser beam reflected by the reflecting element is smaller than the arrangement interval of the multi-emitter laser diodes. Therefore, regardless of the size of each component constituting the laser module, it is possible to collect a plurality of laser beams in a small range and increase the output of the laser module. Further, the above effect can be obtained with a simple configuration in which a reflective element is added to the conventional configuration.

1 is a diagram illustrating a configuration of a laser combining optical device according to a first embodiment. 2 is a perspective view of a collimator lens provided in the laser combining optical device according to Embodiment 1. FIG. It is the top view and side view of a structure which combined the laser synthetic | combination optical apparatus which concerns on Embodiment 1, and a condensing lens. 1 is a perspective view of a configuration in which a laser combining optical device and a condenser lens according to Embodiment 1 are combined. It is a figure which shows the structure which combined the multi-emitter laser diode and condensing lens in the case of not using a reflective element. FIG. 6 is a diagram showing a configuration of a laser combining optical device according to a modification of the first embodiment. FIG. 5 is a diagram illustrating a configuration of a laser synthesis optical device according to a second embodiment. 6 is a diagram illustrating a configuration of a laser combining optical device according to a modification of the second embodiment. FIG. FIG. 6 is a diagram illustrating a configuration of a laser synthesis optical device according to a third embodiment. FIG. 10 is a diagram illustrating a configuration of a laser combining optical device according to a modification of the third embodiment. FIG. 6 is a diagram illustrating a configuration of a laser combining optical device according to a fourth embodiment. It is a figure which shows the structure of a single emitter laser diode. It is a perspective view of a multi-emitter laser diode.

  Examples of embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments.

<Embodiment 1>
Before describing embodiments of the present invention, a single emitter laser diode (hereinafter also referred to as a single emitter LD) and a multi emitter laser diode (hereinafter also referred to as a multi emitter LD) will be described. 12A and 12B are diagrams showing the configuration of the single emitter LD. FIG. 13 is a perspective view of the multi-emitter laser LD. It should be noted that the arrangement shown in the figure follows the coordinate system illustrated by the XYZ axes.

  In the single emitter LD, an emitter that is a light emitting point is disposed in a sealed package 10 including an electrode 11, a holding member, a heat radiating member, and the like. The reason why the emitter is arranged in the sealing structure is mainly to prevent dew condensation due to the influence of temperature and humidity in the environment. For this reason, an airtight sealing structure in which an inert gas or dry air is enclosed is generally used, and laser light is emitted by supplying power to the electrode 11 from the outside. Further, the laser beam 22 emitted from the single emitter LD has different spread angles of the laser beam 32 in the XZ plane (FIG. 12A) and in the YZ plane (FIG. 12B). In this specification, a system having a large spread angle is defined by the YZ plane. Hereinafter, a direction in which the emission angle of the laser beam 32 is large is referred to as a fast axis, and a direction orthogonal to the fast axis is referred to as a slow axis.

  The laser output of the single emitter LD is about 1 W or less, and the output is insufficient for a light source of a projection display device such as a projector. For this reason, a configuration has been proposed in which a plurality of laser modules each having a plurality of single emitter LDs are arranged and the output light of each laser module is optically combined.

  Alternatively, a laser module equipped with a multi-emitter LD having a plurality of light emitting points has been developed for the purpose of increasing the output of the laser module itself. FIG. 13 is a diagram schematically showing the multi-emitter LD20. The multi-emitter LD 20 has a plurality of light emitting points 31 arranged in the X-axis direction in the figure, and laser light 32 similar to the single emitter LD is emitted from each light emitting point 31. Therefore, a laser module 222 on which a multi-emitter LD is mounted emits a laser beam 222 that is a combination of the laser beams 32 of a plurality of single-emitter LDs.

  Here, the layer in which the plurality of light emitting points 31 are arranged is called an active layer and has a thickness of about 1 μm. Therefore, it can be considered that the laser light 222 in the YZ plane is roughly emitted from a point light source, and laser light with high parallelism can be relatively easily generated by a collimator lens or the like. Hereinafter, a laser combining optical device including a plurality of multi-emitter LDs will be described.

  FIG. 1 is a diagram showing a configuration of a laser combining optical device 100 according to the first embodiment. The laser combining optical device 100 includes two multi-emitters LD 20a and 20b, two collimator lenses 30, and a reflecting element 50.

  The multi-emitter LDs 20a and 20b are the same as the multi-emitter LD shown in FIG. The interval between the light emitting points of the multi-emitter LD 20a and the multi-emitter LD 20b is arranged at the interval D1 in consideration of the physical size of the multi-emitter LD itself and the space for heat dissipation. The laser light emitted from each multi-emitter LD 20a, 20b passes through each collimator lens 30 that converts the laser light into parallel light and becomes substantially parallel laser light. Since FIG. 1 is a schematic diagram in which coordinates are taken on the YZ plane, a light beam in the figure represents a fast axis laser beam. Therefore, the plurality of light emitting points in each of the multi-emitters LD20a and 20b are arranged in a direction perpendicular to the drawing.

  Since the fast axis laser beam can be regarded as an approximate point light source as described above, it can be converted into a laser beam having a high degree of parallelism with a relatively simple lens configuration. FIG. 2 shows a configuration example of the collimator lens 30. FIG. 2A shows a collimator lens having a lens effect only in the YZ plane (in the fast axis plane). The fast axis light of all the light emitting points arranged in the X-axis direction is converted into parallel laser light. FIG. 2B shows a collimator lens having a shape in which a plurality of lenses corresponding to each light emitting point are arranged. In FIG. 2B, not only the fast axis but also the parallelism of the laser beam in the slow axis direction is corrected. The collimator lens is not limited to this example, and the lens shape and lens configuration surface can be arbitrarily set in view of the configuration of the laser module and the required parallelism of the laser beam.

  As shown in FIG. 1, the reflecting element 50 has a shape obtained by extending a parallelogram in a direction perpendicular to the drawing sheet. The reflection element 50 includes total reflection surfaces 50a and 50b that are parallel to each other. The laser light is totally reflected at the total reflection surfaces 50a and 50b.

  In FIG. 1, the laser beam 222 b that is emitted from the multi-emitter LD 20 b and passes through the collimator lens 30 and becomes substantially parallel light passes through the reflecting element 50 without being reflected.

  On the other hand, the laser beam 222a emitted from the multi-emitter LD 20a and having passed through the collimator lens 30 to become substantially parallel light is first totally reflected by the total reflection surface 50a of the reflection element 50 and directed toward the total reflection surface 50b. change. Next, the light is totally reflected by the total reflection surface 50b and emitted as laser light parallel to the laser light 222b.

  That is, the laser beam 222a emitted from the multi-emitter LD 20a is shifted in parallel with the reflecting element 50 in the direction approaching the laser beam 222b emitted from the multi-emitter LD 20b. For this reason, the distance D2 between the laser light 222b transmitted through the reflecting element 50 and the laser light 222a reflected by the reflecting element 50 is smaller than the distance D1 between the multi-emitters LD20a and 20b.

  Therefore, regardless of the size of each component constituting the laser module, it is possible to collect a plurality of laser beams in a small range and increase the output of the laser module.

  As shown in FIG. 1, the reflecting element 50 has a shape obtained by extending a parallelogram in a direction perpendicular to the drawing sheet, and can be manufactured relatively easily. In addition, since the laser light is synthesized using total reflection, it is not necessary to apply special coating or the like to the total reflection surfaces 50a and 50b, and can be manufactured at low cost. Furthermore, since the reflection element 50 performs synthesis by utilizing total reflection on the total reflection surfaces 50a and 50b, the refractive index of the material is determined in consideration of the wavelength of the laser beam and the angle of the slope. For this reason, it is realizable with a comparatively cheap glass material.

  3A and 3B are respectively a cross-sectional view along the YZ direction and an XZ direction of the configuration in which the laser combining optical device 100 and the condenser lens 40 according to the first embodiment are combined. It is sectional drawing. FIG. 4 is a perspective view of a configuration in which the laser combining optical device 100 and the condenser lens 40 are combined. FIG. 5 is a diagram showing a configuration for condensing the laser beams of the multi-emitter LDs 20a and 20b without using the reflecting element 50.

  As is apparent from FIG. 5, when the reflecting element 50 is not used, the combined diameter DL is determined depending on the distance D1 between the light emitting points of the multi-emitters LD20a and 20b. Here, the combined diameter DL is the diameter of the laser light before entering the condenser lens 40. On the other hand, in the first embodiment (FIG. 3), the combined diameter DL can be reduced as compared with the configuration not using the reflecting element 50 (FIG. 5). By reducing the combined diameter DL, the diameter of the condenser lens 40 can be reduced.

<Effect>
The laser combining optical device 100 according to the first embodiment includes a plurality of multi-emitter laser diodes 20a and 20b, and a plurality of collimator lenses 30 disposed on the light emission surface side of the plurality of multi-emitter laser diodes 20a and 20b. And at least one reflection element 50 including two total reflection surfaces 50a and 50b. The laser light 222a emitted from one multi-emitter laser diode 20a is reflected on the two total reflection surfaces 50a and 50b of the reflection element 50. The light is sequentially reflected and shifted in a direction approaching the laser beam 222b emitted from another multi-emitter laser diode 20b.

  Therefore, the laser light 222a emitted from the multi-emitter LD 20a is shifted in parallel with the reflecting element 50 in a direction approaching the laser light 222b emitted from the multi-emitter LD 20b. For this reason, the distance D2 between the laser light 222b transmitted through the reflecting element 50 and the laser light 222a reflected by the reflecting element 50 is smaller than the distance D1 between the multi-emitters LD20a and 20b. Therefore, regardless of the size of each component constituting the laser module, it is possible to collect a plurality of laser beams in a small range and increase the output of the laser module. In addition, the above-described effects can be obtained with a simple configuration in which the reflective element 50 is added to the conventional configuration.

  Further, in the laser combining optical device 100 according to the first embodiment, the laser light 222a emitted from one multi-emitter laser diode 20a is sequentially reflected by the two total reflection surfaces 50a and 50b of the reflecting element 50, and another The laser beam is shifted in the direction approaching the laser beam 222b emitted from the multi-emitter laser diode 20b and not reflected by the reflecting element 50.

  Accordingly, in the first embodiment, the trajectory of one laser beam 222a is translated so as to be closer to the other laser beam 222b, so that a plurality of laser beams can be brought into a small range without changing the trajectory of the laser beam 222b. It is possible to collect.

  In the laser combining optical device 100 according to the first embodiment, the two total reflection surfaces 50a and 50b provided in the reflecting element 50 are parallel to each other.

  Accordingly, the laser beam 222a emitted from the multi-emitter LD 20a can be sequentially reflected by the two total reflection surfaces 50a and 50b of the reflection element 50 and shifted in parallel from the original trajectory.

<Modification of Embodiment 1>
FIG. 6 is a diagram illustrating a modification of the laser combining optical device 100 according to the first embodiment. The reflecting element 50 provided in the laser combining optical device 100A illustrated in FIG. 6 is shorter in the Y-axis direction than the reflecting element 50 included in the laser combining optical device 100. Therefore, in FIG. 6, the laser beam 222 b emitted from the multi-emitter LD 20 b and passed through the collimator lens 30 to become substantially parallel light passes through a path where the reflecting element 50 does not exist.

  On the other hand, the laser beam 222a emitted from the multi-emitter LD 20a and having passed through the collimator lens 30 to become substantially parallel light is first totally reflected by the first total reflection surface 50a of the reflection element 50, as in the first embodiment. Then, the direction is changed toward the total reflection surface 50b. Next, the light is totally reflected by the total reflection surface 50b and emitted as laser light parallel to the laser light 222b.

  That is, the interval D2 between the laser beam 222b and the laser beam 222a reflected by the reflecting element 51 is smaller than the interval D1 between the multi-emitters LD20a and 20b.

  In this modification, the reflective element 50 can be made smaller, and therefore the reflective element 50 can be manufactured at a lower cost.

<Embodiment 2>
FIG. 7 is a diagram showing a configuration of the laser combining optical device 200 according to the second embodiment. In FIG. 7, the two collimator lenses 30 are configured integrally with the reflecting element 50. Each collimator lens 30 has either a shape having a lens function only in the fast axis direction (FIG. 2A) or a shape composed of a plurality of lenses corresponding to each light emitting point (FIG. 2B). In addition, the reflection element 50 can be integrated. Since other configurations are the same as those of the first embodiment (FIG. 1), description thereof is omitted.

<Effect>
In the laser combining optical device 200 according to the second embodiment, a plurality of collimator lenses 30 are integrated with the reflecting element 50.

Therefore, in the second embodiment, the plurality of collimator lenses 30 and the reflection element 50 are integrally formed, or the plurality of collimator lenses 30 and the reflection element 50 are directly joined without using a holding component. Yes. Therefore, the accuracy of the mutual angle error between the distance between the two collimator lenses 30, the tilt of the collimator lens 30, and the optical axis of the collimator lens 30 and the first and second total reflection surfaces 50a and 50b is improved. Is possible.

<Modification of Embodiment 2>
FIG. 8 is a diagram illustrating a modification of the laser combining optical device 200 according to the second embodiment. The laser combining optical device 200A shown in FIG. A plurality of collimator lenses 30 are formed integrally with the optical element 60. The optical element 60 and the reflective element 50 are directly joined or integrally formed.

  In FIG. 8, the laser beam 222 b emitted from the multi-emitter LD 20 b and passed through the collimator lens 30 formed in the optical element 60 and becomes substantially parallel light passes through a path where the reflecting element 50 does not exist.

  On the other hand, the laser beam 222a emitted from the multi-emitter LD 20a and having passed through the collimator lens 30 to become substantially parallel light is first totally reflected by the total reflection surface 50a of the reflection element 50, as in the second embodiment, and then totally reflected. The direction is changed toward the reflecting surface 50b. Next, the light is totally reflected by the total reflection surface 50b and emitted as laser light parallel to the laser light 222b.

  That is, the interval D2 between the laser beam 222b and the laser beam 222a reflected by the reflecting element 50 is smaller than the interval D1 between the multi-emitters LD20a and 20b.

<Effect>
In the laser combining optical device 200A according to the modification of the second embodiment, the plurality of collimator lenses 30 are integrally formed on a common member (that is, the optical element 60).

  Therefore, it is possible to improve the positional accuracy between the plurality of collimator lenses 30 by integrally forming the plurality of collimator lenses 30 on a common member.

<Embodiment 3>
FIG. 9 is a diagram illustrating a configuration of the laser combining optical device 300 according to the second embodiment. The laser combining optical device 300 includes first and second reflecting elements 51 and 52, first to fifth multi-emitters LD 21, 22, 23, 24 and 25, and five collimator lenses 30.

  The configuration comprising the first and fourth multi-emitters LD 21 and 24, the two collimator lenses 30 and the first reflecting element 51 is the same as the combining optical device 100 in Embodiment 1 (FIG. 1) (ie, the multi-emitters LD 20a and 20b). The configuration is the same as the configuration including the two collimator lenses 30 and the reflective element 50.

  The configuration including the second and fifth multi-emitters LD 22 and 25, the two collimator lenses 30 and the second reflecting element 52 is a configuration in which the left and right sides of the combining optical device 100 in the first embodiment (FIG. 1) are reversed. Correspond.

  Further, as shown in FIG. 9, a third multi-emitter LD 23 is arranged between the fourth and fifth multi-emitters LD 24 and 25. That is, in the configuration of FIG. 9, the first and second reflecting elements 51 and 52 are arranged symmetrically with the third multi-emitter LD 23 in between.

  As shown in FIG. 9, the laser light 2221 emitted from the first multi-emitter LD passes through the collimator lens 30 and becomes substantially parallel light, and then the two total reflection surfaces 51a, 51a, The light is sequentially reflected by 51b and shifted toward the laser beam 2222 emitted from the second multi-emitter LD. The laser light 2224 emitted from the fourth multi-emitter LD 24 passes through the collimator lens 30 and becomes substantially parallel light, and then passes through the first reflecting element 51 without being reflected.

  Further, the laser light 2222 emitted from the second multi-emitter LD 22 passes through the collimator lens 30 and becomes substantially parallel light, and then is sequentially reflected by the two total reflection surfaces 52 a and 52 b of the second reflecting element 52. Thus, the laser beam 2221 emitted from the first multi-emitter LD 21 is shifted in the direction approaching. The laser light 2225 emitted from the fifth multi-emitter LD 25 passes through the collimator lens 30 and becomes substantially parallel light, and then passes through the second reflecting element 52 without being reflected.

  The laser light 2223 emitted from the third multi-emitter LD 23 passes through the collimator lens 30 and becomes substantially parallel light, and then is not reflected by the first and second reflecting elements 51 and 52 but is first reflected. It comes between the laser light 2221 of the first multi-emitter LD emitted from the element 51 and the laser light 2222 of the second multi-emitter LD emitted from the second reflecting element 52.

<Effect>
In the laser combining optical apparatus 300 according to the third embodiment, the at least one reflecting element is the first and second reflecting elements 51 and 52, and one of the plurality of multi-emitter laser diodes is the first reflecting element 51. The first multi-emitter laser diode 21 incident on the second multi-emitter laser diode 21 and another one of the plurality of multi-emitter laser diodes is the second multi-emitter laser diode 22 incident on the second reflecting element 52. The laser beam 2221 emitted from the emitter laser diode 21 is sequentially reflected by the two total reflection surfaces 51 a and 51 b of the first reflection element 51 and approaches the laser beam 2222 emitted from the second multi-emitter laser diode 22. The laser beam 2222 emitted from the second multi-emitter laser diode 22 is Two total reflection surfaces 52a of the reflecting element 52, is sequentially reflected by the 52 b, it shifts toward the laser beam 2221 emitted from the first multi-emitter laser diode 21.

  Therefore, it is possible to increase the density of the combined light by using two reflecting elements (first and second reflecting elements 51 and 52) and bringing the plurality of laser beams close to each other by the reflecting elements. .

  In the laser combining optical device 300 according to the third embodiment, the plurality of multi-emitter laser diodes includes the third multi-emitter laser diode 23, and the laser light 2223 emitted from the third multi-emitter laser diode 23 is Laser light 2221 of the first multi-emitter laser diode 21 that is not reflected by the first and second reflecting elements 51 and 52 and is emitted from the first reflecting element 51 and the second that is emitted from the second reflecting element 52. The laser light 2222 of the multi-emitter laser diode 22 comes between.

  Therefore, using two reflecting elements (first and second reflecting elements 51 and 52), a plurality of laser beams are brought close to each other by each reflecting element, and another laser beam (that is, the third multi-emitter LD). It is possible to further increase the density of the synthesized light by adding the laser beam 2223).

<Modification of Embodiment 3>
FIG. 10 is a diagram illustrating a modification of the laser combining optical device 300 according to the third embodiment. The laser combining optical device 300A shown in FIG. 10 further includes a common member 70 with respect to the laser combining optical device 300 (FIG. 9). The common member 70 is a transparent member, for example, flat glass. The first and second reflecting elements 51 and 52 and the common member 70 are integrated. Here, being integrated means that it is directly joined or integrally formed.

<Effect>
In the laser combining optical device 300A according to the modification of the third embodiment, the first and second reflecting elements 51 and 52 are integrated via a common member (common member 70).

  Accordingly, by integrating the first and second reflecting elements 51 and 52 through, for example, flat glass as the common member 70, the mutual positional accuracy of the first and second reflecting elements 51 and 52 is improved. Can do. By improving the accuracy of the angles of the total reflection surfaces 51a and 51b of the first reflection element 51 and the angles of the total reflection surfaces 52a and 52b of the second reflection element 52, a plurality of laser beams 2221, 222, and 2223 are obtained. , 2224, 2225 are improved in parallelism. Therefore, since the diameter of the synthesized light becomes smaller, the density of the synthesized light can be further increased.

<Embodiment 4>
FIG. 11 is a diagram illustrating a configuration of the laser combining optical device 400 according to the fourth embodiment. The laser combining optical device 400 includes a reflecting element 50, first to third multi-emitters LD 21, 22 and 23, and three collimator lenses 30. The first to third multi-emitters LD 21, 22 and 23 are arranged in this order.

  As shown in FIG. 11, the laser light 2221 emitted from the first multi-emitter LD 21 and passed through the collimator lens 30 to become substantially parallel light does not pass through the reflecting element 50 and is synthesized as it is. The laser beam 2222 emitted from the second multi-emitter LD 22 and passed through the collimator lens 30 to become substantially parallel light passes through the reflecting element 50 without being reflected. The laser beam 2223 emitted from the third multi-emitter LD 23 and having passed through the collimator lens 30 to become substantially parallel light is first totally reflected by the total reflection surface 50a of the reflection element 50, and directed toward the total reflection surface 50b. Change direction. Next, the light is totally reflected by the total reflection surface 50 b and emitted as laser light parallel to the laser light 2221 and 222.

  That is, the laser light 2223 emitted from the third multi-emitter LD23 is reflected by the reflecting element 50 from the laser light 2221 emitted from the first multi-emitter LD21 and the laser light 2222 emitted from the second multi-emitter LD22. Shift to come between.

<Effect>
In the laser combining optical device 400 according to the fourth embodiment, the plurality of multi-emitter laser diodes are the first, second, and third multi-emitter laser diodes 21, 22, and 23, and the first, second, and third multi-emitter laser diodes. The multi-emitter laser diodes 21, 22, and 23 are arranged in this order, and the laser light 2223 emitted from the third multi-emitter laser diode 23 is sequentially reflected by the two total reflection surfaces 50 a and 50 b of the reflection element 50. Thus, the laser beam 2221 emitted from the first multi-emitter laser diode 21 and not reflected by the reflecting element 50 is placed between the laser beam 2222 emitted from the second multi-emitter laser diode 22 and not reflected by the reflecting element 50. Sneak away.

  Therefore, by guiding the laser beam 2223 between the two laser beams 2221 and 2222 by the reflecting element 50, it becomes possible to synthesize the three laser beams at a high density.

  In the laser combining optical device 400 according to the fourth embodiment, the distance between the first and second multi-emitter laser diodes 21 and 22 is different from the distance between the second and third multi-emitter laser diodes 22 and 23. .

  For example, if the characteristics (output, wavelength, conversion efficiency, etc.) of the first, second, and third multi-emitters LD 21, 22, and 23 are different from each other, different heat dissipation structures may be required. At this time, it is necessary to adopt different shapes for the peripheral holding structure of each multi-emitter LD, the heat dissipating component, and the like. In the fourth embodiment, since the length of the reflecting element 50 in the Y-axis direction can be freely changed, the distance between the first and second multi-emitters LD21 and 22 and the second and third multi-emitters LD22 and 23 It is possible to vary the interval of. Therefore, the first, second, and third multi-emitters LD21, 22, and 23 can be arranged at a desired interval according to the characteristics of each multi-emitter LD.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  100, 100A, 200, 200A, 300, 400 Laser synthesizing optical device, 11 electrodes, 20, 20a, 20b multi-emitter laser diode, 21 first multi-emitter laser diode, 22 second multi-emitter laser diode, 23 third Multi-emitter laser diode, 24 fourth multi-emitter laser diode, 25 fifth multi-emitter laser diode, 30 collimator lens, 31 light emitting point, 40 condenser lens, 50 reflective element, 51 first reflective element, 52 first 2 reflective elements, 50a, 50b, 51a, 51b, 52a, 52b Total reflection surface, 32, 222a, 222b, 2221, 2222, 2223, 2224, 2225 Laser light.

Claims (9)

A plurality of multi-emitter laser diodes;
A plurality of collimator lenses arranged on the light exit surface side of each of the plurality of multi-emitter laser diodes;
At least one reflective element comprising two total reflection surfaces;
With
Laser light emitted from one multi-emitter laser diode is sequentially reflected by the two total reflection surfaces of the reflective element, and is emitted from another multi-emitter laser diode and transmitted without reflecting the reflective element. Shift in the direction approaching the laser beam,
Laser synthesis optical device. The plurality of collimator lenses are directly fixed to the reflective element;
The laser synthesis optical apparatus according to claim 1 . The plurality of collimator lenses are integrally formed on a common member.
The laser synthesizing optical apparatus according to claim 1 or 2 . The at least one reflective element is a first and second reflective element;
Wherein the plurality of multi-emitter laser diode, the first and the first and fourth multi-emitter laser diode to be incident on the reflective element, the second and fifth multi-emitter laser diode to be incident on the second reflecting element Including
Laser light emitted from the fourth multi-emitter laser diode is transmitted without reflecting the first reflective element,
Laser light emitted from the fifth multi-emitter laser diode passes through the second reflective element without being reflected,
Laser light emitted from the first multi-emitter laser diode is sequentially reflected by the two total reflection surfaces of the first reflective element and emitted from the second and fourth multi-emitter laser diodes. Shifted in the direction approaching
Laser light emitted from the second multi-emitter laser diode is sequentially reflected by the two total reflection surfaces of the second reflective element, and emitted from the first and fifth multi-emitter laser diodes. Shift in the direction of approaching,
The laser synthesis optical apparatus according to claim 1. The plurality of multi-emitter laser diodes include a third multi-emitter laser diode;
The third laser beam emitted from the multi-emitter laser diode, the laser beam detecting means is not reflected by the first and second reflective elements, the first said emitted from the reflective element of the first multi-emitter laser diode And the laser beam of the second multi-emitter laser diode emitted from the second reflecting element,
The laser combining optical device according to claim 4 . The first and second reflective elements are integrated via a common member;
The laser synthesizing optical device according to claim 4 or 5 . The plurality of multi-emitter laser diodes are first, second and third multi-emitter laser diodes;
The first, second and third multi-emitter laser diodes are arranged in this order;
Laser light emitted from the third multi-emitter laser diode is sequentially reflected by the two total reflection surfaces of the reflective element, and is emitted from the first multi-emitter laser diode and is not reflected by the reflective element. And the laser beam emitted from the second multi-emitter laser diode and not reflected by the reflecting element,
The laser synthesis optical apparatus according to claim 1. An interval between the first and second multi-emitter laser diodes is different from an interval between the second and third multi-emitter laser diodes;
The laser combining optical device according to claim 7 . The two total reflection surfaces of the reflection element are parallel to each other;
The laser combining optical device according to any one of claims 1 to 8 .