CN111522188B - Laser light source device and laser projection equipment - Google Patents
Laser light source device and laser projection equipment Download PDFInfo
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- CN111522188B CN111522188B CN201910104916.4A CN201910104916A CN111522188B CN 111522188 B CN111522188 B CN 111522188B CN 201910104916 A CN201910104916 A CN 201910104916A CN 111522188 B CN111522188 B CN 111522188B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
Abstract
The invention discloses a laser light source device and a laser projection device, comprising: at least three groups of laser arrays, light combining reflectors and polarization light combining reflectors; wherein, the polarization beam combiner and the beam combiner are used for combining the laser beams. In the laser light source device, the scale of a single laser array does not need to be enlarged, and the light energy of the light source is improved by adopting a mode that a plurality of groups of laser arrays are incident to the light-combining reflector and the polarization light-combining reflector to combine laser beams of each group of laser arrays. The size of the combined laser beam is similar to that of the laser beam of the single group of laser arrays, and the power of the laser beam is obviously improved. Therefore, the purposes of increasing the laser emitting power and keeping the smaller laser beam size are achieved, the redesign of elements after the change of the laser array light path is not needed, and the design cost is saved.
Description
Technical Field
The invention relates to the field of projection display, in particular to a laser light source device and laser projection equipment.
Background
The laser has the advantages of high brightness, strong monochromaticity, wide color gamut and the like, is applied to the field of projection display, and has higher and higher requirements on output energy along with the increasing of the projection size of the laser display, so that higher requirements are put forward on a laser light source device.
The laser light source usually employs a laser array composed of a plurality of lasers, and when higher laser light energy is required, the number of laser arrays needs to be increased. However, when the number of lasers in the laser array increases, if the design of the light combining optical path is not reasonable, the size of the laser spot emitted by the final laser array will increase. Then the parameters such as the clear aperture of each element located behind the optical path of the laser array need to be redesigned, resulting in an increase in the size of the optical lens. For example, if the number of coupled lasers in the laser source device is increased from 4 to 6, the size of the emergent spot of the laser source device is increased by 50%. The aperture of the lens and other elements behind the laser light path needs to be increased by at least 50%, and the thickness of the lens is also increased, which undoubtedly increases the design cost and difficulty of the laser light source device.
Disclosure of Invention
The invention provides a laser light source device and laser projection equipment, which improve the emergent power of laser on the premise of keeping the spot size of the emergent laser.
In a first aspect, the present invention provides a laser light source device, at least comprising: the laser system comprises a first laser array group, a second laser array group, a third laser array group, a light combining reflector and a polarization light combining mirror; the light combining reflector is positioned on the light emergent side of the polarization light combining reflector;
emergent light of the first laser array group, the second laser array group and the third laser array group comprises a plurality of laser beams;
the polarization light combining mirror comprises: a transmission surface and a reflection surface which are arranged oppositely; each laser beam emitted by the first laser array group is incident to the transmission surface, and each laser beam emitted by the second laser array group is incident to the reflection surface; the polarization direction of each laser beam emitted by the first laser array group is vertical to that of each laser beam emitted by the second laser array group;
the light combining mirror includes: a transmission part and a reflection part which are alternately arranged; each laser beam emitted by the third laser array group is incident to each reflecting part respectively;
the polarization light-combining mirror is used for combining the laser beams incident from the transmission surface and the reflection surface and respectively incident to the transmission parts of the light-combining mirror;
and the light combining reflector is used for combining the laser beams incident from the transmission parts and the reflection parts and emitting the combined laser beams in a set direction.
In an implementation manner, in the laser light source device provided by the present invention, the light emitting surface of the first laser array group is perpendicular to the light emitting surface of the second laser array group, and the light emitting surface of the second laser array group is parallel to the light emitting surface of the third laser array group;
the second laser array group rotates by 90 degrees relative to the third laser array group by taking a normal perpendicular to a light-emitting surface of the third laser array group as an axis; and the third laser array group rotates by 90 degrees relative to the first laser array group by taking the intersection line of the light-emitting surface of the first laser array group and the light-emitting surface of the third laser array group as an axis.
In an implementable manner, in the laser light source device provided by the present invention, each of the lasers in the first laser array group, the second laser array group, and the third laser array group is a semiconductor laser;
the shapes of the polarization light-combining mirror and the light-combining mirror are both rectangular; each reflection part and each transmission part are strip-shaped areas which are alternately arranged in parallel along the slow axis direction of the emergent laser beams of the first laser array group;
the fast axis directions of the emergent laser beams of the first laser array group and the third laser array group are parallel to the extending direction of the strip-shaped area;
the fast axis direction of the emergent laser beams of the second laser array group is perpendicular to the extending direction of the strip-shaped area.
In a second aspect, the present invention provides another laser light source device, including at least: the fourth laser array group, the fifth laser array group, the sixth laser array group, the light combining mirror and the polarization light combining mirror; wherein the content of the first and second substances,
the polarization light-combining mirror is positioned on the light-emitting side of the light-combining mirror;
emergent light of the fourth laser array group, the fifth laser array group and the sixth laser array group comprises a plurality of laser beams;
the light combining mirror includes: a transmission part and a reflection part which are alternately arranged; each laser beam emitted by the fourth laser array group is incident to each transmission part; each laser beam emitted by the fifth laser array group is incident to each reflecting part respectively;
the polarization light combining mirror comprises: a transmission surface and a reflection surface which are arranged oppositely; each laser beam emitted by the sixth laser array group enters the reflecting surface of the polarization beam combiner;
the light-combining reflector is used for combining the laser beams incident from the transmission parts and the reflection parts and then incident to the transmission surface of the polarization light-combining reflector;
and the polarization beam combiner is used for combining the laser beams incident from the transmission surface and the reflection surface and emitting the combined laser beams in a set direction.
In an implementation manner, in the laser light source device provided by the present invention, the light emitting surface of the fourth laser array group is perpendicular to the light emitting surface of the fifth laser array group, and the light emitting surface of the fifth laser array group is parallel to the light emitting surface of the sixth laser array group;
the fifth laser array group rotates by 90 degrees relative to the fourth laser array group by taking the intersection line of the light-emitting surface of the fourth laser array group and the light-emitting surface of the fifth laser array group as an axis; and the six laser array groups rotate 90 degrees relative to the fifth laser array group by taking a normal perpendicular to the light-emitting surface of the fifth laser array group as an axis.
In an implementable manner, in the laser light source device provided by the present invention, each of the lasers in the fourth laser array group, the fifth laser array group, and the sixth laser array group is a semiconductor laser;
the shapes of the polarization light-combining mirror and the light-combining mirror are both rectangular; each reflection part and each transmission part are strip-shaped areas which are alternately arranged in parallel along the slow axis direction of the emergent laser beams of the fourth laser array group;
the fast axis directions of the emergent laser beams of the fourth laser array group and the fifth laser array group are both parallel to the extending direction of the strip-shaped area;
and the fast axis direction of the emergent laser beams of the sixth laser array group is vertical to the extending direction of the strip-shaped area.
In a third aspect, the present invention provides a laser projection apparatus, including any one of the above laser light source devices, an optical modulation device located in a light emitting direction of the laser light source device, and a projection lens located on a light emitting side of the optical modulation device.
In an implementable manner, in the above laser projection apparatus provided by the present invention, each laser array group in the laser light source device includes: two groups of laser arrays arranged side by side;
the laser array includes: lasers arranged in two rows and four columns.
In a practical manner, in the above laser projection apparatus provided by the present invention, the total number of the polarization beam combiner and the beam combiner included in the laser light source device is at least 1 less than the number of the laser arrays.
In an implementable manner, in the above laser projection apparatus provided by the present invention, a width of the reflection portion in the light-combining mirror satisfies the following relationship:
d＞b＞L/cosθ；
the width of the reflecting part is b, the distance between two adjacent lasers in the laser array is d, the width of a slow axis of an emergent laser beam is L, and the included angle between the reflecting part and a light-emitting surface of the laser array group, which is incident to the reflecting part, is theta.
The invention has the following beneficial effects:
the invention provides a laser light source device and a laser projection device, comprising: at least three groups of laser arrays, light combining reflectors and polarization light combining reflectors; wherein, the polarization beam combiner and the beam combiner are used for combining the laser beams. In the laser light source device, the scale of a single laser array does not need to be enlarged, and the light energy of the light source is improved by adopting a mode that a plurality of groups of laser arrays are incident to the light-combining reflector and the polarization light-combining reflector to combine laser beams of each group of laser arrays. The size of the combined laser beam is similar to that of the laser beam of the single group of laser arrays, and the power of the laser beam is obviously improved. Therefore, the purposes of increasing the laser emitting power and keeping the smaller laser beam size are achieved, the redesign of elements after the change of the laser array light path is not needed, and the design cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser light source device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a light combining reflector according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a laser light source device according to an embodiment of the present invention;
fig. 4 is a second schematic structural diagram of a light combining reflector according to an embodiment of the present invention;
fig. 5 is a third schematic structural diagram of a laser light source device according to an embodiment of the present invention;
FIG. 6 is a fourth schematic view of a laser light source device according to an embodiment of the present invention;
FIG. 7 is a fifth schematic view illustrating a laser source device according to an embodiment of the present invention;
FIG. 8 is a sixth schematic view illustrating a laser source device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The laser light source device and the laser projection apparatus provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In a first aspect of the embodiment of the present invention, a laser light source device is provided, as shown in fig. 1, the laser light source device provided in the embodiment of the present invention at least includes: a first laser array group 111, a second laser array group 112, a third laser array group 113, a light combining mirror 121, and a polarization light combining mirror 122. The light combining reflector 121 is located on the light emitting side of the polarization light combining reflector 122.
In a specific implementation, each laser in the first laser array group 111, the second laser array group 112, and the third laser array group 113 may emit a laser beam, and thus the emitted light of the three laser array groups includes a plurality of laser beams.
In the embodiment of the present invention, as shown in fig. 1, the lower surface of the polarization beam combiner 122 is used as the transmission surface, and the upper surface of the polarization beam combiner 122 is used as the reflection surface. Each laser beam emitted from the first laser array group 111 enters the transmission surface of the polarization beam combiner 122; each laser beam emitted from the second laser array group 112 enters the reflection surface of the polarization beam combiner 122; the polarization direction of each laser beam emitted from the first laser array group 111 is perpendicular to the polarization direction of each laser beam emitted from the second laser array group 112.
Further, as shown in fig. 2, the light combining mirror 121 includes: the transmissive portions 1211 and the reflective portions 1212 are alternately arranged. The laser beams emitted from the third laser array group 113 enter the reflection portions 1212, respectively.
In the laser light source device according to the embodiment of the present invention, the polarization beam combiner 122 is configured to combine the laser beams incident on the transmission surface and the reflection surface, and to respectively enter the transmission portions 1211 of the beam combiner 121. And a light-combining mirror 121 for combining the laser beams incident on the transmission units 1211 and the reflection units 1212 and emitting the combined laser beams in a predetermined direction. The set direction is the light emitting direction of the laser light source device.
Specifically, the polarization beam combiner 122 may include a transparent substrate, and at least two dielectric layers alternately coated on the transparent substrate. The material and thickness of each dielectric layer are selected according to the brewster's theorem, the installation directions of each laser array group are reasonably set, each laser beam emitted by the first laser array group 111 with the polarization direction parallel to the incident plane is transmitted when entering the polarization beam combiner 122, each laser beam emitted by the second laser array group 112 with the polarization direction perpendicular to the incident plane is reflected when entering the polarization beam combiner 122, and therefore the laser beams emitted by the two groups of laser arrays with the polarization directions perpendicular to each other are combined and then emitted to the beam combiner.
Further, when the light combining mirror 121 is manufactured, the reflective portion and the transmissive portion may be divided on the transparent substrate. And the reflecting film is plated at the position corresponding to the reflecting part, and the antireflection film is plated or not plated at the position corresponding to the transmitting part to keep a transparent state. In the embodiment of the present invention, the reflecting portion of the light combining mirror 121 simultaneously has a polarization selection function, and the reflecting film in the reflecting portion 1211 may include at least two kinds of dielectric layers stacked, and the refractive index and the thickness of the dielectric layers are set such that the reflecting portion can reflect the incident light with the polarization direction parallel to the incident plane and transmit the incident light with the polarization direction perpendicular to the incident plane. The transmission unit 1211 does not have a polarization selection function, and transmits either incident light having a polarization direction parallel to the incident surface or incident light having a polarization direction perpendicular to the incident surface.
In the embodiment of the present invention, the transmission portion 1211 and the reflection portion 1212 of the light combining mirror 121 may be arranged with a suitable distance, so that the component of each combined laser beam of the polarization light combining mirror, the polarization direction of which is parallel to the incident surface, may completely pass through the transmission portion 1211 of the light combining mirror 121, and the component of which the polarization direction is perpendicular to the incident surface may be simultaneously incident to the transmission portion 1211 and the reflection portion 1212 of the light combining mirror 121; the laser beams emitted from the third laser array group 113 may be incident on the reflection portion 1212. Therefore, the laser beams of the three groups of laser arrays can be combined by adopting the polarization light combination mirror 122 and the light combination mirror 121 to improve the output power of the laser.
In practical implementation, the arrangement direction of the laser array group determines the polarization direction of the laser emitted by the laser array group. In the embodiment of the present invention, the polarization direction of the laser beam emitted from the first laser array group 111 and the polarization direction of the laser beam emitted from the third laser array group 113 are both parallel to the incident surface when entering the polarization beam combiner or the beam combiner, and the polarization direction of the laser beam emitted from the second laser array group 112 is perpendicular to the incident surface when entering the polarization beam combiner. Therefore, as shown in fig. 1, the light emitting surface of the first laser array group 111 may be perpendicular to the light emitting surface of the second laser array group 112, and the light emitting surface of the second laser array group 112 may be parallel to the light emitting surface of the third laser array group 113. The second laser array group 112 may be placed in a manner of rotating by 90 degrees with respect to the third laser array group 113 by taking a normal perpendicular to the light emitting surface of the third laser array group as an axis; the third laser array group 113 may be disposed by rotating by 90 degrees with respect to the first laser array group 111 by taking an intersection line of the light-emitting surface of the first laser array group and the light-emitting surface of the third laser array group as an axis. Each laser in the first laser array group 111, the second laser array group 112, and the third laser array group 113 may be a semiconductor laser; the semiconductor laser outputs a light beam with a fast axis and a slow axis, the divergence angle of the laser light in the slow axis direction is about +/-10 degrees, and the divergence angle of the laser light in the fast axis direction is about +/-30 degrees. After laser beams emitted by the laser are collimated, the size of the light spot in the fast axis direction is larger than that of the light spot in the slow axis direction, the light spot is rectangular or elliptical, the long side/long axis direction of the light spot is the fast axis direction, and the short side/short axis direction of the light spot is the slow axis direction.
In order to match the shape of the laser spot, the polarization beam combiner 122 and the beam combiner 121 provided in the embodiment of the present invention may be both rectangular; and the reflection portions 1212 and the transmission portions 1211 of the light-combining mirror 121 may be disposed as stripe-shaped regions alternately arranged in parallel in the slow axis direction of the outgoing laser beams parallel to the first laser array group 111.
In order to reduce the overall size of the laser array, the lasers are generally arranged along the slow axis direction, and in order to allow the laser beams of the first laser array group 111 to completely pass through the transmission portion 1211 of the light combining mirror 121 after passing through the polarization light combining mirror 122, the fast axis direction of the outgoing laser beams of the first laser array group 111 may be set parallel to the extending direction of the stripe-shaped transmission portion and the stripe-shaped reflection portion, the fast axis direction of the outgoing laser beams of the second laser array group 112 may be set perpendicular to the extending direction of the stripe-shaped transmission portion and the stripe-shaped reflection portion, and the fast axis direction of the outgoing laser beams of the third laser array group 113 may be set parallel to the extending direction of the stripe-shaped transmission portion and the stripe-shaped reflection portion.
The laser beam emitted by the semiconductor laser has a unique polarization direction, and the polarization direction can be parallel to the short axis direction of the light spot and can also be parallel to the long axis direction of the light spot. The polarization direction of the laser beam emitted by the semiconductor laser is parallel to the minor axis direction of the spot. When the same semiconductor laser is used to emit laser beams with perpendicular polarization directions, the laser arrangement direction can be rotated, for example, in a three-dimensional coordinate system, when the light emitting surface of the first laser array group 111 is in the plane formed by the x-y axes, the light emitting surfaces of the second laser array group 112 and the third laser array group 113 are in the plane formed by the y-z axes, and the laser incident surface is parallel to the plane formed by the x-z axes. The fast axis direction of the laser beam emitted by the first laser array group 111 is parallel to the y axis, and the slow axis direction is parallel to the x axis, then the fast axis direction of the laser beam emitted by the second laser array group 112 is parallel to the z axis, and the slow axis direction is parallel to the y axis, and the fast axis direction of the laser beam emitted by the third laser array group 113 is parallel to the y axis, and the slow axis direction is parallel to the z axis. The polarization directions of the outgoing laser beams of the first laser array group 111 and the third laser array group 113 are both parallel to the plane formed by the x-z axes, and the polarization direction of the outgoing laser beam of the second laser array group 112 is perpendicular to the plane formed by the x-z axes. In this case, the short side directions of the light combining mirror 121 and the polarization light combining mirror 122 may be parallel to the y-axis, and the stripe-shaped reflection part and the transmission part in the light combining mirror 121 may be arranged in the long side direction. The fast axes of the laser spots of the first laser array group 111 and the third laser array group 113 are parallel to the extending directions of the strip-shaped transmission part and the reflection part of the light combining reflector 121, so that the arrangement directions of the reflection part and the transmission part in the light combining reflector 121 are matched with the arrangement direction of the lasers in the laser array group, and the emitting efficiency of the laser beams is improved.
By rotating the arrangement direction of the semiconductor lasers, the outgoing laser beams of the first laser array group 111 and the outgoing laser beams of the second laser array group 112 are combined into a first combined laser beam under the action of the polarization beam combiner 122, and the cross section of the first combined laser beam perpendicular to the propagation direction is in a crossed cross shape or a cross shape. The laser beam emitted from the first laser array group 111 needs to be incident on the transmission portion of the light-combining mirror 121. The laser beam emitted from the third laser array group 113 needs to be aligned with the reflection portion of the light combining mirror 121, so that the emitted laser beams of the first laser array group 111, the second laser array group 112, and the third laser array group 113 can be combined by the light combining mirror and the polarization light combining mirror.
In a second aspect of the embodiment of the present invention, another laser light source apparatus is provided, as shown in fig. 3, the laser light source apparatus provided in the embodiment of the present invention at least includes: a fourth laser array group 114, a fifth laser array group 115, a sixth laser array group 116, a light combining mirror 121, and a polarization light combining mirror 122; the polarization beam combiner 122 is located on the light-emitting side of the beam combiner 121.
In a specific implementation, each laser in the fourth laser array group 114, the fifth laser array group 115, and the sixth laser array group 116 may emit a laser beam, and thus the emitted light of the three laser array groups includes a plurality of laser beams.
As shown in fig. 4, the light combining mirror 121 includes: the transmissive portions 1213 and the reflective portions 1214 are alternately arranged. The laser beams emitted from the fourth laser array group 114 are incident on the transmissive portions 1213, and the laser beams emitted from the fifth laser array group 115 are incident on the reflective portions 1214.
Further, the polarization beam combiner 122 includes a transmission surface and a reflection surface opposite to each other, and in the embodiment of the present invention, as shown in fig. 3, a lower surface of the polarization beam combiner 122 serves as the transmission surface, and an upper surface of the polarization beam combiner 122 serves as the reflection surface. Each laser beam emitted from the sixth laser array group 116 enters the reflection surface of the polarization beam combiner 122; the polarization direction of each laser beam emitted from the sixth laser array group 116 is perpendicular to the polarization direction of each laser beam emitted from the fourth laser array group 114 and the fifth laser array group 115.
In the laser light source device according to the embodiment of the present invention, the light combining mirror 121 is configured to combine the laser beams incident on the transmission portions 1213 and the reflection portions 1214 and to enter the laser beams on the transmission surface of the polarization light combining mirror 122. And a polarization beam combiner 122 for combining the laser beams incident on the transmission surface and the reflection surface and emitting the combined laser beams in a predetermined direction. The set direction is the light emitting direction of the laser light source device.
Specifically, the light combining mirror 121 can be manufactured by dividing a reflection portion and a transmission portion on a transparent substrate. And plating a reflection increasing film at the position corresponding to the second reflection part, and plating a transmission increasing film or not at the position corresponding to the transmission part to keep a transparent state. The reflecting film and the antireflection film can adopt a thin film interference principle, and a medium thin film with proper refractive index and thickness is arranged according to the incident angle of the fifth laser array group 115 incident to the reflecting part and the wavelength of laser emitted by the fifth laser array group, and is used for generating a reflection increasing effect on the incident laser beam of the fifth laser array group 115; and setting a medium film with proper refractive index and thickness according to the incident angle of the fourth laser array group 114 to the transmission part and the wavelength of the laser emitted by the fourth laser array group, and using the medium film to perform an antireflection action on the incident laser beam of the fourth laser array group 114. Thus, the light combining mirror 121 can combine the laser beams having the emission polarization directions of the fourth laser array group 114 and the fifth laser array group 115 parallel to the incident surface and emit the combined laser beams to the transmission surface of the polarization light combining mirror 122.
In the embodiment of the present invention, the transmission unit 1213 and the reflection unit 1214 provided in the light combining mirror 121 do not have a polarization selection function, and only the light incident on the transmission unit is transmitted and the light incident on the reflection unit is reflected. Accordingly, each laser beam emitted from the fourth laser array group 114 needs to be incident on the transmission portion 1213 of the light combining reflector 121, and each laser beam emitted from the fifth laser array group 115 needs to be incident on the reflection portion 1214 of the light combining reflector 121, so that the light combining reflector 121 can combine the laser beams emitted from the fourth laser array group 114 and the fifth laser array group 115 and then emit the combined laser beams to the transmission surface of the polarization light combining reflector 122. further, the polarization light combining reflector 122 may include a transparent substrate, and at least two dielectric layers alternately coated on the transparent substrate. The material and thickness of each dielectric layer are selected according to the brewster's theorem, the installation direction of each laser array group is reasonably set, the combined laser beams of the fourth laser array group 114 and the fifth laser array group 115 with the polarization direction parallel to the incident surface are made to be a lens when entering the polarization beam combiner 122, and the laser beams emitted from the sixth laser array group 116 with the polarization direction perpendicular to the incident surface are made to be reflected when entering the polarization beam combiner 122, so that the laser beams with the polarization directions perpendicular to each other are combined.
In the embodiment of the present invention, the transmission portions 1213 and the reflection portions 1214 of the light combining mirror 121 may be arranged with a suitable pitch, so that each laser beam emitted from the fourth laser array group 114 is incident on each transmission portion 1213 of the light combining mirror 121, and each laser beam emitted from the fifth laser array group 115 is incident on each reflection portion 1214 of the light combining mirror 121.
In practical implementation, the arrangement direction of the laser array group determines the polarization direction of the laser emitted by the laser array group. In the embodiment of the present invention, the polarization direction of the laser beam emitted from the fourth laser array group 114 and the polarization direction of the laser beam emitted from the fifth laser array group 115 are both parallel to the incident plane when the incident combined light is reflected, and the polarization direction of the laser beam emitted from the sixth laser array group 116 is perpendicular to the incident plane when the incident combined light is reflected. Therefore, as shown in fig. 3, the light emitting surface of the fourth laser array group 114 may be perpendicular to the light emitting surface of the fifth laser array group 115, and the light emitting surface of the fifth laser array group 115 may be parallel to the light emitting surface of the sixth laser array group 116. The fifth laser array group 115 may be disposed by rotating by 90 degrees with respect to the fourth laser array group 114 by taking an intersection line of the light-emitting surface of the fourth laser array group 114 and the light-emitting surface of the fifth laser array group 115 as an axis; the six laser array groups 116 may be disposed to be rotated by 90 degrees with respect to the fifth laser array group 115 with a normal line perpendicular to the light exit surface of the fifth laser array group 115 as an axis.
In a specific implementation, each laser in the fourth laser array group 114, the fifth laser array group 115, and the sixth laser array group 116 may be a semiconductor laser; the outgoing laser beams of each of the above laser arrays have a fast axis and a slow axis.
The shapes of the polarization beam combiner 122 and the beam combiner 121 can be both rectangular according to the shape of the laser spot; and the respective reflection portions 1213 and the respective transmission portions 1214 in the light combining mirror 121 may be provided as stripe-shaped areas alternately arranged in parallel in the slow axis direction of the outgoing laser beams parallel to the fourth laser array group 114.
The fast axis directions of the outgoing laser beams of the fourth laser array group 114 and the fifth laser array group 115 may be parallel to the extending directions of the strip-shaped transmission part and the strip-shaped reflection part, and the fast axis direction of the outgoing laser beam of the sixth laser array group 116 may be perpendicular to the extending directions of the strip-shaped transmission part and the strip-shaped reflection part.
The laser beam emitted by the semiconductor laser generally has a unique polarization direction, and the polarization direction can be parallel to the short axis direction of the light spot or the long axis direction of the light spot. The polarization direction of the laser beam emitted by the semiconductor laser is parallel to the minor axis direction of the spot. When the same semiconductor laser is used to emit laser beams with perpendicular polarization directions, the laser arrangement direction can be rotated, for example, in a three-dimensional coordinate system, when the light emitting surface of the fourth laser array group 114 is in the plane formed by the x-y axes, the light emitting surfaces of the fifth laser array group 115 and the sixth laser array group 116 are in the plane formed by the y-z axes, and the laser incident surface is parallel to the plane formed by the x-z axes. The fast axis direction of the laser beam emitted by the fourth laser array group 114 is parallel to the y axis, and the slow axis direction is parallel to the x axis, so that the fast axis direction of the laser beam emitted by the fifth laser array group 115 is parallel to the y axis, the slow axis direction is parallel to the z axis, and the fast axis direction of the laser beam emitted by the sixth laser array group 116 is parallel to the z axis, and the slow axis direction is parallel to the y axis. The polarization directions of the outgoing laser beams of the fourth laser array group 114 and the fifth laser array group 115 are both parallel to the plane formed by the x-z axes, and the polarization direction of the outgoing laser beam of the sixth laser array group 116 is perpendicular to the plane formed by the x-z axes. In this case, the short-side directions of the light combining mirror 121 and the polarization light combining mirror 122 may be parallel to the y-axis, and the stripe-shaped reflection part and the transmission part of the light combining mirror 121 may be arranged in the long-side direction. The fast axes of the laser spots of the fourth laser array group 114 and the fifth laser array group 115 are parallel to the extending directions of the strip-shaped transmission part and the reflection part of the light combining reflector 121, so that the arrangement directions of the reflection part and the transmission part in the light combining reflector 121 are matched with the arrangement direction of the lasers in the laser array group, and the emitting efficiency of the laser beams is improved.
By rotating the arrangement direction of the semiconductor lasers, the outgoing laser beams of the fourth laser array group 114 and the outgoing laser beams of the fifth laser array group 115 can be combined into a second combined laser beam through the action of the light combining mirror 121, and the cross section of the second combined laser beam perpendicular to the propagation direction is rectangular. The laser beams emitted from the fourth laser array group 114 need to be incident on the transmission portions 1213 of the light-combining mirror 121, and the laser beams emitted from the fifth laser array group 115 need to be incident on the reflection portions 1214 of the light-combining mirror 121. The polarization direction of the laser beams combined by the light combining mirror 121 is parallel to the incident surface, the polarization direction of the outgoing laser beams of the sixth laser array group 116 is perpendicular to the incident surface, and the polarization light combining mirror 122 combines the laser beams having the polarization direction parallel to the incident surface and the polarization direction perpendicular to the incident surface.
In practical application, the laser beam emitted by the semiconductor laser has a width of about 2.5mm along the fast axis direction and a width of about 1mm along the slow axis direction. The lasers in each group of laser arrays may be arranged along the slow axis of the laser spot. For example, a bank packaging method using 2 × 4 laser beams is used. When two groups of 2 × 4 lasers are used to form the above laser array groups, respectively, an array of 6 2 × 4 lasers is combined to form a beam. The exit laser spot size for each set of laser arrays was approximately 40mm x 40 mm. The spot size of the laser beam of each group of laser arrays combined by the structure is basically unchanged and is about 40mm multiplied by 40 mm. Because a certain inclination angle exists between the light combining reflector 121, the polarization light combining reflector 122 and the exit surface of the laser array group, and the installation size needs to be reserved for the lens, when the light combining reflector 121 and the polarization light combining reflector 122 are installed in an inclined 45-degree angle mode, the size of the light combining reflector 121 is about 57mm × 42mm, wherein 3 transmission parts are arranged among 4 reflection parts, the size of each area is about 8mm × 42mm, and edges with 0.5mm are reserved on the other two sides and used for being fixed with the structural part; the size of the polarization combiner 122 is about 69mm x 50 mm. The combined laser power was about 228W.
Therefore, by adopting the structures of the two laser light source devices provided by the embodiment of the invention, the scale of a single laser array does not need to be enlarged, and the light energy of the light source is improved by adopting a mode of using more than three groups of laser beams of the laser array through a polarization light-combining mirror and a light-combining reflector. The size of the combined laser beam is similar to that of the laser beam of the single group of laser arrays, and the power of the laser beam is obviously improved. Therefore, the purpose of increasing the laser emergent power is achieved, the redesign of elements after the change of the light path of the laser array is not needed, and the design cost is saved.
In addition to the above embodiment in which the laser light source device includes three laser arrays, in practical applications, more laser arrays may be added to enhance the laser output power. Taking the structure shown in fig. 5 as an example, on the basis of the structure of the laser light source device shown in fig. 3, a laser array group 117 is added between the fifth laser array group 115 and the sixth laser array group 116, and the placement direction of the laser array group 117 may be the same as the placement direction of the fifth laser array group 115; meanwhile, a light-combining mirror 121' is added to receive each laser beam emitted from the seventh laser array group 117.
Specifically, the laser beams emitted from the fourth laser array group 114 are incident on the respective transmission portions of the light combining mirror 121 and transmitted, and the laser beams emitted from the fifth laser array group 115 are incident on the respective reflection portions of the light combining mirror 121 and reflected, so that the laser beams emitted from the fourth laser array group 114 and the fifth laser array group 115 are combined by the light combining mirror 121 and emitted to the respective transmission portions of the light combining mirror 121'; the transmission part of the light combining mirror 121 ' transmits the combined laser beam of the fourth laser array group 114 and the fifth laser array group 115, and each laser beam emitted from the added laser array group 117 enters each reflection part of the light combining mirror 121 ' and is reflected, so that the light combining mirror 121 ' combines the laser beams of the fourth laser array group 114, the fifth laser array group 115, and the added laser array group 117 and then emits the combined laser beam to the polarization light combining mirror 122, and the polarization direction of the combined laser beam is parallel to the incident surface. The polarization beam combiner 122 transmits the laser beams with the polarization direction parallel to the incident surface after receiving the laser beams, reflects the laser beams after receiving the laser beams emitted by the sixth laser array group 116 with the polarization direction perpendicular to the incident surface, and finally combines the emitted laser beams of the four groups of laser arrays.
The polarization directions of the laser beams emitted from the fourth laser array group 114, the fifth laser array group 115 and the added laser array group 117 are all parallel to the incident surface, so the extending directions of the strip-shaped reflecting parts of the light combining mirrors 121 and 121' can be all parallel to the fast axes of the lasers in the fourth laser array group 114, the fifth laser array group 115 and the added laser array group 117, so that the light combining mirrors can fully receive the incident laser beams and emit the combined laser beams in the transmission direction. However, since the transmission portion of the light combining mirror 121 'needs to transmit the combined laser beams of the fourth laser array group 114 and the fifth laser array group 115, the width of the transmission portion of the light combining mirror 121' needs to be larger than the width of the transmission portion of the light combining mirror 121, and accordingly, if the width of the transmission portion of the light combining mirror 121 'is increased, the pitch of the reflection portion is increased accordingly, and therefore, the pitch of each laser in the laser array group 117 needs to be adaptively adjusted so that the outgoing light of each laser in the laser array group 117 can be incident on each reflection portion of the light combining mirror 121'.
In addition, more groups of laser arrays can be added on the basis of the structure of the laser light source device shown in fig. 1 to enhance the laser emergent power. For example, a group of laser array groups with a third polarization direction may be added on the side of the third laser array group 113 away from the second laser array group 112, and accordingly, a light combining mirror may be added to reflect the outgoing laser beams of the added group of laser arrays. If the emission intensity of the laser needs to be further enhanced and more groups of laser arrays are added, appropriate light-combining mirrors are required to be arranged corresponding to the laser arrays according to the arrangement positions of the laser arrays and the polarization directions of the emitted laser beams, which are not listed.
In practical implementation, the light combining mirror 121 and the polarization light combining mirror 122 in the laser light source device can combine the outgoing laser beams of at least three groups of laser arrays, and one group of laser arrays at least includes one laser array, so that the total number of the light combining mirror 121 and the polarization light combining mirror 122 in the laser light source device provided by the embodiment of the present invention is at least 1 less than the number of the laser arrays.
Furthermore, the laser arrays emit laser beams simultaneously after the lasers are arranged in an array, and a certain distance needs to be kept between the lasers in order to avoid crosstalk of the emitted laser beams between adjacent lasers. When the light-combining mirror 121 is used to reflect the laser beams emitted from the laser array, the width of the reflecting portion needs to be set according to the width and the interval of the laser beams emitted from the lasers. The width of the reflecting portion in the light combining reflector may satisfy the following relationship:
d＞b＞L/cosθ；
wherein, b is the width of the reflection part, d is the distance between two adjacent lasers in the laser array, L is the width of the slow axis of the outgoing laser beam, and theta is the included angle between the reflection part and the light-emitting surface of the laser array group which enters the reflection part.
When the relation is satisfied, when the laser beams emitted by the laser array group are incident to the reflecting parts of the light-combining reflecting mirror, the reflecting parts can completely receive the laser beams and completely reflect the received laser beams.
In the structures shown in fig. 1 and 3 in the embodiment of the present invention, an included angle between the reflection portion of the light combining mirror and the light emitting surface of the laser array group incident to the reflection portion is 45 degrees, and at this time, the width of the reflection portion may be set according to the following rule:
therefore, when the laser beams emitted by the laser array group are respectively incident to the reflecting parts of the light-combining reflecting mirror, the reflecting parts can completely receive the laser beams and completely reflect the received laser beams.
Further, in the embodiment of the present invention, as shown in fig. 6 and 7, the laser light source device further includes: the light source beam-reducing assembly 13, the light source beam-reducing assembly 13 may be a transmissive beam-reducing assembly or a reflective beam-reducing assembly. When the light source beam reduction assembly is a transmissive assembly, as shown in fig. 6, the light source beam reduction assembly 13 includes: the positive transmission lens 131 and the negative lens 132 are sequentially disposed along the light exiting direction of the light combining lens group 12, and the image space focal point of the positive lens 131 coincides with the object space focal point or the image space focal point of the negative lens 132. The positive transmission 131 and the negative lens 132 in fig. 7 form a telescope system, which can reduce the size of the incident parallel laser beam, the reduced laser beam is more suitable for the requirement of elements in the subsequent optical path, and the reduced laser beam has higher energy density.
When the light source beam reduction assembly is a reflective type assembly, as shown in fig. 7, the light source beam reduction assembly 13 includes: the concave reflector 133 and the convex reflector 134 are positioned on the light-emitting side of the light combining set 12, and the focal point of the concave reflector 133 coincides with the focal point of the convex reflector 134. The emergent light of the light combining set 12 firstly enters the concave reflecting mirror 133, is reflected by the concave reflecting mirror 133 and is converged and emitted to the convex reflecting mirror 134; and then is condensed and collimated out after being reflected by the convex reflector 134. As shown in fig. 8, when the reflective beam-reducing unit is used, not only the laser beam can be reduced, but also the propagation direction of the laser beam can be changed, so that when the size of the whole machine in a certain direction is to be reduced, the reflective light source beam-reducing unit can be preferably used.
In a specific implementation, the type of the light source beam-reducing assembly may be selected according to actual needs, and is not limited herein.
Further, as shown in fig. 8, the laser light source device according to the embodiment of the present invention further includes: the light source beam-shrinking device comprises a diffusion sheet 14 positioned in the light-emitting direction of the light source beam-shrinking component 13, a dichroic mirror 15, a reflective fluorescent wheel 16 positioned on the reflection light path of the dichroic mirror 15, a light path steering component 17, a color filter wheel 18 positioned on the side, away from the reflective fluorescent wheel 16, of the dichroic mirror 15, and a light-homogenizing component 19.
The common blue laser array is taken as an example for explanation, after laser beams emitted by the blue laser array are shrunk, the laser beams are homogenized through the diffusion sheet 14, the uneven energy distribution of laser spots is prevented, the phenomenon that the fluorescent wheel is burnt due to the fact that the local light energy of the laser beams is large, the fluorescent conversion efficiency is reduced is avoided, and the effect of reducing laser speckles can be achieved. The dichroic mirror 15 is capable of reflecting blue light and transmitting fluorescent light. The blue laser light is reflected by the dichroic mirror 15, and is converged by the lens to be irradiated onto the reflective fluorescent wheel 16. In the embodiment of the present invention, the reflective fluorescent wheel 16 can be used, and is divided into two regions, i.e., a reflective phosphor region and a laser transmission portion. The laser periodically impinges on both areas as the reflective fluorescent wheel 16 rotates. The phosphor region generates fluorescence by irradiation of the laser, and the phosphor region has a back plate capable of reflecting light, so that the excited fluorescence is reflected by the back plate. Since the emission of the fluorescence is non-directional and has a large angle, the fluorescence needs to be collimated by a lens, and the fluorescence reflected by the back plate is collimated by the lens and then incident on the dichroic mirror 15 again to be transmitted. When the blue laser light is emitted to the laser light transmitting portion on the reflective fluorescent wheel 16, the laser light is transmitted through the fluorescent wheel, is emitted from the rear surface thereof, is reflected once by a blue light circuit (generally including elements such as lenses, mirrors, and diffusion sheets) constituted by the optical path turning element 17, and is re-incident on the dichroic mirror 15 and reflected. The blue light is reflected by the dichroic mirror 15, combined with the fluorescent light (red fluorescent light and green fluorescent light), converged by a lens group, and reaches the light uniformizing section 19 after passing through the color filter wheel 18. The color filter wheel 18 can provide tricolor light meeting the requirement according to the requirement of color purity. Which rotates synchronously with the reflective phosphor wheel 16 and has a corresponding color zone. A blue light transmission part of the color filter wheel 18 through which blue light passes when the fluorescent wheel outputs blue laser light according to the rotation timing of the reflective fluorescent wheel 16; when the fluorescent wheel generates red fluorescent light, the color filter wheel 18 rotates to the red color filter area for color filtering, and similarly, the green fluorescent light passes through the corresponding green color filter area, so that three primary colors are obtained through the color filter wheel 18. The tricolor light is homogenized by the light homogenizing part 19 and then emitted to the following light path. In practical applications, the light homogenizing member 19 may be a light bar, a light pipe, or the like, and is not limited herein.
Based on the same inventive concept, a third aspect of the embodiments of the present invention provides a laser projection apparatus, which includes any one of the above laser light source devices. The laser projection equipment can realize laser projection by utilizing the tricolor light generated by the laser light source device. In practical applications, the laser projection apparatus, as shown in fig. 9, includes, in addition to the laser light source device described above: a light valve modulation component 200 positioned at the light-emitting side of the laser light source device, and a projection lens 300 positioned at the light-emitting side of the light valve modulation component 200. The laser light source device can output light rays with different colors to the light valve modulation component 200 in a time sequence manner, and the light valve modulation component 200 modulates the incident light rays with different colors in a time sequence manner, so that an image reflected to the projection lens 300 to be imaged meets the requirement.
In an implementation, the laser projection apparatus may be a Digital Light Processing (DLP) projection system, and the Light valve modulation component 200 may be a Digital Micromirror Device (DMD). The digital processing of the image signal makes the laser light source emit light of different colors in time sequence to be projected on the DMD chip, the DMD chip modulates and reflects the light according to the digital signal, and finally the light is imaged on the projection screen through the projection lens.
The embodiment of the invention provides a laser light source device and a laser projection device, comprising: at least three groups of laser arrays, light combining reflectors and polarization light combining reflectors; wherein, the polarization beam combiner and the beam combiner are used for combining the laser beams. In the laser light source device, the scale of a single laser array does not need to be enlarged, and the light energy of the light source is improved by adopting a mode that a plurality of groups of laser arrays are incident to the light-combining reflector and the polarization light-combining reflector to combine laser beams of each group of laser arrays. The size of the combined laser beam is similar to that of the laser beam of the single group of laser arrays, and the power of the laser beam is obviously improved. Therefore, the purposes of increasing the laser emitting power and keeping the smaller laser beam size are achieved, the redesign of elements after the change of the laser array light path is not needed, and the design cost is saved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A laser light source device, comprising at least: the laser system comprises a first laser array group, a second laser array group, a third laser array group, a light combining reflector and a polarization light combining reflector; wherein the content of the first and second substances,
the light-combining reflector is positioned on the light-emitting side of the polarization light-combining reflector;
emergent light of the first laser array group, the second laser array group and the third laser array group comprises a plurality of laser beams;
the polarization light combining mirror comprises: a transmission surface and a reflection surface which are arranged oppositely; each laser beam emitted by the first laser array group is incident to the transmission surface, and each laser beam emitted by the second laser array group is incident to the reflection surface; the polarization direction of each laser beam emitted by the first laser array group is vertical to that of each laser beam emitted by the second laser array group;
the light combining mirror includes: a transmission part and a reflection part which are alternately arranged; each laser beam emitted by the third laser array group is incident to each reflecting part respectively; the reflecting part is used for reflecting each laser beam with the polarization direction parallel to the incident surface and transmitting each laser beam with the polarization direction vertical to the incident surface; the polarization direction of the laser beam emitted by the third laser array group is parallel to the incident surface of the light-combining reflector, and the polarization direction of the laser beam emitted by the second laser array group is vertical to the incident surface when the laser beam enters the light-combining reflector;
the polarization beam combiner is used for combining the laser beams incident from the transmission surface and the reflection surface and respectively incident to the transmission parts of the beam combiner;
the light-combining reflector is used for combining the laser beams incident from the transmission parts and the reflection parts and emitting the combined laser beams in a set direction;
each laser array group in the laser light source device comprises: two groups of laser arrays arranged side by side; the laser array includes: lasers arranged in two rows and four columns.
2. The laser light source device according to claim 1, wherein a light emitting surface of the first laser array group is perpendicular to a light emitting surface of the second laser array group, and the light emitting surface of the second laser array group is parallel to the light emitting surface of the third laser array group;
the second laser array group rotates by 90 degrees relative to the third laser array group by taking a normal perpendicular to a light-emitting surface of the third laser array group as an axis; and the third laser array group rotates by 90 degrees relative to the first laser array group by taking the intersection line of the light-emitting surface of the first laser array group and the light-emitting surface of the third laser array group as an axis.
3. The laser light source device according to claim 2, wherein each of the lasers in the first laser array group, the second laser array group, and the third laser array group is a semiconductor laser;
the shapes of the polarization light combination mirror and the light combination mirror are rectangular; each reflection part and each transmission part are strip-shaped areas which are alternately arranged in parallel along the slow axis direction of the emergent laser beams of the first laser array group;
the fast axis directions of the emergent laser beams of the first laser array group and the third laser array group are parallel to the extending direction of the strip-shaped area;
the fast axis direction of the emergent laser beams of the second laser array group is perpendicular to the extending direction of the strip-shaped area.
4. A laser light source device, comprising at least: the fourth laser array group, the fifth laser array group, the sixth laser array group, the light combining mirror and the polarization light combining mirror; wherein the content of the first and second substances,
the polarization light-combining mirror is positioned on the light-emitting side of the light-combining mirror;
emergent light of the fourth laser array group, the fifth laser array group and the sixth laser array group comprises a plurality of laser beams;
the light combining reflector includes: the transmission part and the reflection part are alternately arranged; each laser beam emitted by the fourth laser array group is incident to each transmission part; each laser beam emitted by the fifth laser array group is incident to each reflecting part respectively;
the polarization light combining mirror comprises: a transmission surface and a reflection surface which are arranged oppositely; each laser beam emitted by the sixth laser array group enters the reflecting surface of the polarization beam combiner; the polarization direction of each laser beam emitted by the sixth laser array group is perpendicular to the polarization direction of each laser beam emitted by the fourth laser array group and the polarization direction of each laser beam emitted by the fifth laser array group;
the light-combining mirror is used for combining the laser beams incident from the transmission parts and the reflection parts and then incident on the transmission surface of the polarization light-combining mirror;
the polarization light-combining mirror is used for combining the laser beams incident from the transmission surface and the reflection surface and emitting the laser beams to a set direction;
a light emitting surface of the fourth laser array group is perpendicular to a light emitting surface of the fifth laser array group, and the light emitting surface of the fifth laser array group is parallel to the light emitting surface of the sixth laser array group;
the fifth laser array group rotates by 90 degrees relative to the fourth laser array group by taking the intersection line of the light-emitting surface of the fourth laser array group and the light-emitting surface of the fifth laser array group as an axis; the six laser array groups rotate 90 degrees relative to a fifth laser array group by taking a normal perpendicular to a light-emitting surface of the fifth laser array group as an axis;
each laser array group in the laser light source device comprises: two groups of laser arrays arranged side by side; the laser array includes: lasers arranged in two rows and four columns.
5. The laser light source device according to claim 4, wherein each of the lasers in the fourth laser array group, the fifth laser array group, and the sixth laser array group is a semiconductor laser;
the shapes of the polarization light-combining mirror and the light-combining mirror are both rectangular; each reflection part and each transmission part are strip-shaped areas which are alternately arranged in parallel along the slow axis direction of the emergent laser beams of the fourth laser array group;
the fast axis directions of the emergent laser beams of the fourth laser array group and the fifth laser array group are both parallel to the extending direction of the strip-shaped area;
and the fast axis direction of the emergent laser beams of the sixth laser array group is vertical to the extending direction of the strip-shaped area.
6. A laser projection apparatus comprising the laser light source device according to any one of claims 1 to 3; or, the laser projection device comprises the laser light source device according to any one of claims 4 to 5, a light valve modulation component located in the light exit direction of the laser light source device, and a projection lens located on the light exit side of the light valve modulation component.
7. The laser projection device of claim 6, wherein the total number of polarization beam combiner and beam combiner included in the laser source arrangement is at least 1 less than the number of laser arrays.
8. The laser projection device of claim 7, wherein the width of the reflecting portion in the light combining mirror satisfies the following relationship:
wherein the content of the first and second substances,bis the width of the reflection part and is,dthe spacing between two adjacent lasers in the laser array,Lthe width of the slow axis of the outgoing laser beam,θthe included angle between the reflection part and the light-emitting surface of the laser array group which is incident to the reflection part is set.
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| CN113050354B (en) * | 2021-03-05 | 2023-09-15 | 青岛海信激光显示股份有限公司 | Light source assembly and projection device |
| CN116097165A (en) * | 2020-08-13 | 2023-05-09 | 索尼集团公司 | Light source device and projection display device |
| CN114077138A (en) * | 2020-08-21 | 2022-02-22 | 深圳光峰科技股份有限公司 | Light source system |
| CN114721161B (en) * | 2021-01-05 | 2024-04-05 | 台达电子工业股份有限公司 | Laser spot eliminating device and operation method thereof |
| CN113314954A (en) * | 2021-05-20 | 2021-08-27 | 西安炬光科技股份有限公司 | Laser module |
| CN113552761A (en) * | 2021-07-26 | 2021-10-26 | 电子科技大学 | Reflective laser light combining system |
| CN114063379A (en) * | 2021-11-22 | 2022-02-18 | 四川长虹电器股份有限公司 | Light source device and projection system |
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| US10203593B2 (en) * | 2017-01-27 | 2019-02-12 | Panasonic Intellectual Property Management Co., Ltd. | Light source device having a retardation plate and projection display apparatus including the light source |
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| CN103207509A (en) * | 2012-01-12 | 2013-07-17 | 三菱电机株式会社 | Light Source Device And Projecting Display Device |
| CN203217229U (en) * | 2013-03-01 | 2013-09-25 | 深圳市绎立锐光科技开发有限公司 | Light-emitting device and projection system |
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