CN114678774B - Laser array coupling system with light beam correction function - Google Patents
Laser array coupling system with light beam correction function Download PDFInfo
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- CN114678774B CN114678774B CN202210569260.5A CN202210569260A CN114678774B CN 114678774 B CN114678774 B CN 114678774B CN 202210569260 A CN202210569260 A CN 202210569260A CN 114678774 B CN114678774 B CN 114678774B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4075—Beam steering
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
Abstract
The invention discloses a laser array coupling system with beam correction, comprising: a laser light source for emitting an array of laser beams; the fast axis adjusting unit is used for reducing the space between the adjacent laser beams in the fast axis direction; the beam correction composite prism comprises two obtuse triangular prisms which are identical in structure and symmetrically arranged, and is used for increasing the width of a laser beam in the slow axis direction and reducing the distance between adjacent laser beams in the slow axis direction; the laser beam coupling device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling laser beams emitted from the back refraction surfaces of two obtuse triangular prisms to the single-core optical fiber. The invention can increase the width of the laser beam in the slow axis direction, and simultaneously reduce the distance between the laser beams in the fast axis direction and the slow axis direction, the laser beams emitted from the beam composite correction prism are compactly arranged, the residual divergence angle is eliminated, the laser beams are converged to obtain smaller spot size, and the laser beams can be coupled into the single-core optical fiber with smaller diameter. The invention has compact structure and high integration level.
Description
Technical Field
The invention relates to the technical field of semiconductor laser light sources, in particular to a laser array coupling system with light beam correction.
Background
The output light beam of the laser diode is in elliptical energy distribution and has astigmatism, a residual divergence angle still exists in the horizontal direction after the output light beam is generally collimated in the vertical direction, and after the output light beam is coupled to the optical fiber through the convergent lens, the size of a converged light spot is limited by the residual divergence angle, so that the coupled light spot is not easy to enter the thinner optical fiber, and the coupling efficiency and the optical power output by the optical fiber are influenced.
In order to increase the output optical power, it is generally necessary to perform optical fiber coupling using a plurality of laser diodes, the output beams of the laser diodes are spatially separated from each other due to physical size and mounting size limitations, and the condensing lens has physical aperture limitations, which limit the number of received beams and the spot size. Moreover, when the beam interval is too large, the numerical aperture of the converging beam is too large to be fully coupled into the optical fiber. Therefore, in order to obtain high-power coupling-out, higher requirements are placed on the laser diode arrangement, the optical element layout, the size and compactness of the system.
The technical scheme that TO-Can packaged semiconductor lasers are arranged in the horizontal direction and the vertical direction is provided in the prior art, the TO-Can packaged semiconductor lasers are complex in installation form and large in size, light emitted by the TO-Can packaged semiconductor lasers arranged in the horizontal direction and the vertical direction is not subjected TO beam correction, obvious residual divergence angles exist, the size of a light spot is too large when the light spot is coupled TO an optical fiber, and the light spot is difficult TO be completely coupled into a thinner optical fiber (such as a 100-um fiber core).
The prior art also provides a technical scheme that a plurality of TO-Can packaged semiconductor lasers are fixed on a heat sink in an annular arrangement mode, the arrangement mode causes that output light beams cannot fill the central part of the ring, the central part is not fully utilized, and space waste is caused. The light beam is coupled into the optical fiber, and when the optical fiber outputs, a far field presents a ring-shaped light spot with a darker central part, which influences the uniformity of the light spot.
Therefore, a new laser coupling system is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a laser array coupling system with light beam correction, which has a simple structure, eliminates a residual divergence angle, reduces a light spot size and solves the technical problem.
In order to solve the above problems, the present invention provides a laser array coupling system with beam correction, comprising:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the light beam correction composite prism comprises two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein the included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angle of each obtuse triangular prism is an obtuse angle, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms by the bottom surfaces of the two obtuse triangular prisms, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism so as to reduce the distance between adjacent laser beams in the slow axis direction;
the laser beam coupling device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling laser beams emitted from the back refraction surfaces of two obtuse triangular prisms to the single-core optical fiber.
As a further improvement of the present invention, the incident angle of the laser beam refracted to the bottom face of the obtuse triangular prism by the front refracting face of the obtuse triangular prism is larger than the total reflection angle of the obtuse triangular prism.
As a further improvement of the present invention, the beam correcting composite prism further comprises isosceles triangular prisms, and two waist surfaces of the isosceles triangular prisms are partially glued with the bottom surfaces of the two obtuse triangular prisms, respectively, so as to form air gaps between the waist surfaces of the isosceles triangular prisms and the bottom surfaces of the obtuse triangular prisms.
As a further improvement of the invention, the bottom surface of the obtuse triangular prism is plated with a total reflection film to form a total reflection surface.
As a further development of the invention, the fast axis adjustment unit comprises at least one mirror.
As a further development of the invention, the first group of laser diodes and the second group of laser diodes each comprise at least two laser diodes.
As a further improvement of the present invention, the condensing unit is a condensing lens.
As a further improvement of the invention, two waist surfaces of the isosceles triangular prism are plated with total reflection films to form total reflection surfaces.
The invention also provides a laser array coupling system with beam correction, which comprises:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the light beam correction composite prism comprises isosceles triangular prisms and two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein an included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angle of each obtuse triangular prism is an obtuse angle, two waist surfaces of each isosceles triangular prism are respectively glued with the bottom surfaces of the two obtuse triangular prisms, two waist surfaces of each isosceles triangular prism are plated with a total reflection film to form a total reflection surface, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to rear refraction surfaces of the two obtuse triangular prisms by the two waist surfaces of each isosceles triangular prism and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism, so that the distance between adjacent laser beams in the slow axis direction is reduced;
the laser beam coupling device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling laser beams emitted from the back refraction surfaces of two obtuse triangular prisms to the single-core optical fiber.
The invention also provides a laser array coupling system with beam correction, which comprises:
two laser array coupling subsystems with beam correction, the two laser array coupling subsystems with beam correction being orthogonally arranged, the laser array coupling subsystems with beam correction comprising:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the beam correction composite prism comprises two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein an included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angles of the obtuse triangular prisms are obtuse angles, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms by the bottom surfaces of the two obtuse triangular prisms, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism so as to reduce the distance between adjacent laser beams in the slow axis direction;
the laser array coupling subsystem with the beam correction function comprises a reflection unit and a polarization beam combination unit, wherein the polarization beam combination unit is arranged on a path of a laser beam emitted by one laser array coupling subsystem with the beam correction function, the reflection unit is used for reflecting the laser beam emitted by the other laser array coupling subsystem with the beam correction function to the polarization beam combination unit, and the polarization beam combination unit is used for combining two groups of laser beams emitted by the two laser array coupling subsystems with the beam correction function;
the laser device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling the combined laser beam to the single-core optical fiber.
As a further improvement of the present invention, the polarization beam combining unit is a polarization beam combining mirror.
The invention has the beneficial effects that:
the laser array coupling system with the beam correction can increase the width of the laser beam in the slow axis direction, reduce the distance between the laser beams in the fast axis direction and the slow axis direction, lead the laser beams emitted from the beam composite correction prism to be compactly arranged, eliminate the residual divergence angle, converge to obtain smaller spot size, and can be coupled into the single-core optical fiber with smaller diameter. The invention has compact structure and high integration level, reduces the complexity of system dimming, realizes the ordered arrangement of multiple beams and improves the power of the system.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is an isometric view of a laser array coupling system with beam correction according to a first embodiment of the invention;
FIG. 2 is a side view of a laser array coupling system with beam alignment according to one embodiment of the present invention;
FIG. 3 is a top view of a laser array coupling system with beam alignment according to one embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a collimated laser beam spot of a laser diode according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a light spot of a laser beam output from the beam correcting compound prism according to an embodiment of the present invention;
FIG. 6 is a distribution diagram of spots of laser beams focused on a single core optical fiber according to an embodiment of the present invention;
FIG. 7 is a side view of a laser array coupling system with beam alignment according to a second embodiment of the present invention;
FIG. 8 is a top view of a laser array coupling system with beam alignment according to a second embodiment of the present invention;
FIG. 9 is a side view of a laser array coupling system with beam correction according to a third embodiment of the present invention;
FIG. 10 is a top view of a laser array coupling system with beam alignment according to a third embodiment of the present invention;
FIG. 11 is an isometric view of a laser array coupling system with beam correction according to a fourth embodiment of the present invention;
FIG. 12 is a side view of a laser array coupling system with beam correction according to a fourth embodiment of the present invention;
FIG. 13 is a top view of a laser array coupling system with beam correction according to a fourth embodiment of the present invention;
FIG. 14 is a schematic diagram of a spot of a laser beam output from the polarization beam combination unit according to the fourth embodiment of the present invention;
fig. 15 is a distribution diagram of spots of laser beams condensed to a single core optical fiber in the fourth embodiment of the present invention.
Description of the labeling:
11. a laser diode; 21. a first reflector; 22. a second reflector; 23. a third reflector; 24. a parallelogram reflecting prism; 3. a beam correction compound prism; 31. an obtuse triangular prism; 32. an isosceles prism; 4. a convergence unit; 5. a single core optical fiber; 6. a reflection unit; 7. and a polarization beam combination unit.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example one
As shown in fig. 1 to 3, the present embodiment discloses a laser array coupling system with beam correction, which includes a laser light source, a fast axis adjusting unit, a beam correction compound prism 3, a converging unit 4, and a single core optical fiber 5.
The laser light source is used for emitting a laser beam array and comprises a first group of laser diodes and a second group of laser diodes; wherein the first set of laser diodes and the second set of laser diodes each comprise at least two laser diodes 11. Referring to fig. 3, in the present embodiment, the first group of laser diodes and the second group of laser diodes each include two laser diodes 11, the upper two laser diodes 11 constituting the first group of laser diodes, and the lower two laser diodes 11 constituting the second group of laser diodes.
Referring to fig. 4, the collimated beam output from the laser diode 11 has different spot sizes in the horizontal and vertical directions within the beam transmission section, and is collimated in the long spot size (fast axis) direction and has a residual divergence angle in the short spot size (slow axis) direction. The fast axis direction of the laser beam output by the laser diode 11 is the Z axis, and the slow axis direction is the X axis.
The fast axis adjusting unit is used for reducing the space between the adjacent laser beams in the fast axis direction. In the present embodiment, the transmission directions of the laser beams emitted from the four laser diodes 11 are all the Y direction, the fast axis adjusting unit includes the first reflecting mirror 21 and the second reflecting mirror 22, the first reflecting mirror 21 is used for reflecting the laser beams emitted from the two laser diodes 11 (left side) adjacent to the X direction to the beam correction recombination prism 3, the second reflecting mirror 22 is used for reflecting the laser beams emitted from the two laser diodes 11 (right side) adjacent to the X direction to the beam correction recombination prism 3, referring to fig. 3, the interval of the laser beams reflected from the first reflecting mirror 21 and the second reflecting mirror 22 in the fast axis direction becomes smaller, and the fast axis of the laser beams becomes the Y axis from the Z axis, and the X axis does not change.
The beam correction composite prism 3 comprises two obtuse triangular prisms 31 which are identical in structure and symmetrically arranged, the included angle formed by the bottom surfaces of the two obtuse triangular prisms 31 is an acute angle, the vertex angle of the obtuse triangular prism 31 is an obtuse angle, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms 31, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms 31 by the front refraction surfaces of the two obtuse triangular prisms 31, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms 31 by the bottom surfaces of the two obtuse triangular prisms 31, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms 31; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms 31, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms 31, so that the width of the laser beams in the slow axis direction is increased; the obtuse triangular prism 31 has a length of a front refracting surface greater than that of a rear refracting surface to reduce a space between adjacent laser beams in a slow axis direction.
Alternatively, the incident angle of the laser beam refracted to the bottom surface of the obtuse triangular prism 31 by the front refracting surface of the obtuse triangular prism 31 is larger than the total reflection angle of the obtuse triangular prism 31. So that total reflection occurs at the bottom surface of the obtuse triangular prism 31. Further, the beam correction composite prism 3 further includes an isosceles triple prism 32, and two waist surfaces of the isosceles triple prism 32 are partially glued with the bottom surfaces of the two obtuse triple prisms 31 respectively to form an air gap between the waist surface of the isosceles triple prism 32 and the bottom surface of the obtuse triple prism 31, and the air gap is used for realizing total reflection of the laser beam on the bottom surface of the obtuse triple prism 31, and simultaneously, realizes integral installation of the two obtuse triple prisms 31 and the isosceles triple prism 32.
Alternatively, the bottom surfaces of the two obtuse triangular prisms 31 are coated with a total reflection film to form total reflection surfaces. At this time, total reflection can be achieved regardless of the incident angle of the laser beam refracted from the front refracting surface of the obtuse triangular prism 31 to the bottom surface of the obtuse triangular prism 31. Further, the beam correction composite prism 3 further includes an isosceles prism 32, and two waist surfaces of the isosceles prism 32 are respectively glued with the bottom surfaces of the two obtuse prisms 31, so that the two obtuse prisms 31 and the isosceles prism 32 are integrally mounted.
In another embodiment, the beam correcting composite prism 3 includes an isosceles triangular prism 32, two waist surfaces of the isosceles triangular prism 32 are completely glued to the bottom surfaces of the two obtuse triangular prisms 31, respectively, and the waist surfaces of the isosceles triangular prism 32 are coated with a total reflection film to form total reflection surfaces. The laser beams refracted to the bottom surfaces of the two obtuse triangular prisms 31 by the front refraction surfaces of the two obtuse triangular prisms 31 are totally reflected to the rear refraction surfaces of the two obtuse triangular prisms 31 by the two waist surfaces of the isosceles triangular prisms 32, respectively. At this time, it is not necessary to coat the bottom surface of the obtuse triangular prism 31 with a total reflection film, and total reflection can be achieved regardless of the incident angle of the laser beam refracted to the bottom surface of the obtuse triangular prism 31 by the front refracting surface of the obtuse triangular prism 31.
As shown in fig. 5, in order to obtain the spot of the laser beam output from the beam correction recombination prism 3, it can be seen that the width of the laser beam in the slow axis direction is increased, and the residual divergence angle is reduced. Further, the width of the laser beam in the slow axis direction may be increased to be close to the fast axis to further eliminate the residual divergence angle.
The condensing unit 4 serves to couple the laser beams exiting from the rear refracting surfaces of the two obtuse triangular prisms 31 to the single-core optical fiber 5. Alternatively, the converging unit 4 is a converging lens. The spot distribution of the laser beam condensed on the single core optical fiber 5 is shown in fig. 6. The visible spot size is very small and can be coupled into a single core fiber 5.
Example two
As shown in fig. 7-8, the difference between the laser array coupling system with beam correction in this embodiment and the first embodiment is that the transmission direction of the laser beams emitted by two laser diodes 11 (above) adjacent to each other in the X direction is the Z direction, the transmission direction of the laser beams emitted by two laser diodes 11 (below) adjacent to each other in the X direction is the Y direction, the fast axis adjusting unit 2 in this embodiment includes a third reflecting mirror 23, the third reflecting mirror 23 is used for reflecting the laser beams emitted by two laser diodes 11 (below) adjacent to each other in the X direction to the beam correction composite prism 3, and the laser beams emitted by two laser diodes 11 (above) adjacent to each other in the X direction are directly incident to the beam correction composite prism 3, and referring to fig. 7, the distance between the adjacent laser beams in the fast axis direction is also reduced.
EXAMPLE III
As shown in fig. 9-10, the difference between the laser array coupling system with beam correction in this embodiment and the first embodiment is that the transmission directions of the laser beams emitted by the four laser diodes are all the Z direction, the fast axis adjusting unit 2 in this embodiment includes a parallelogram reflecting prism 24, the third reflecting mirror 23 is used for reflecting the laser beams emitted by the two laser diodes 11 (below) adjacent to each other in the X direction twice, and then the laser beams are incident to the beam correction composite prism 3, and the laser beams emitted by the two laser diodes 11 (above) adjacent to each other in the X direction are directly incident to the beam correction composite prism 3, and referring to fig. 9, the distance between the adjacent laser beams in the fast axis direction is also reduced.
Example four
As shown in fig. 11-13, the laser array coupling system with beam calibration in this embodiment includes:
two laser array coupling subsystems with beam correction, the two laser array coupling subsystems with beam correction are orthogonally arranged, and the laser array coupling subsystem with beam correction comprises:
the laser light source is used for emitting a laser beam array and comprises a first group of laser diodes and a second group of laser diodes;
the fast axis adjusting unit is used for reducing the space between the adjacent laser beams in the fast axis direction;
the beam correction composite prism 3 comprises two obtuse triangular prisms 31 which are identical in structure and symmetrically arranged, the included angle formed by the bottom surfaces of the two obtuse triangular prisms 31 is an acute angle, the vertex angle of the obtuse triangular prism 31 is an obtuse angle, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms 31, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms 31 by the front refraction surfaces of the two obtuse triangular prisms 31, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms 31 by the bottom surfaces of the two obtuse triangular prisms 31, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms 31; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms 31, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms 31, so that the width of the laser beams in the slow axis direction is increased; the obtuse triangular prism 31 has a length of a front refracting surface greater than that of a rear refracting surface to reduce a space between adjacent laser beams in a slow axis direction.
In this embodiment, the laser light source, the fast axis adjusting unit and the beam correcting compound prism 3 are the same as the first embodiment, wherein one laser array coupling subsystem with beam correction is equivalent to another laser array coupling subsystem with beam correction rotated by 90 degrees along Z, that is, the laser beam emitted from one beam correcting compound prism 3 is equivalent to the laser beam emitted from the other beam correcting compound prism 3 rotated by 90 degrees along Z direction, so that the polarization characteristics of two groups of laser beams emitted from the two beam correcting compound prisms 3 have 90 degree difference. Further, the laser light source, the fast axis adjusting unit and the beam correcting compound prism 3 can also be selected from the second embodiment or the third embodiment.
The laser beam path adjusting device comprises a reflection unit 6 and a polarization beam combination unit 7, wherein the polarization beam combination unit 7 is arranged on a path of a laser beam emitted by one laser array coupling subsystem with beam correction, the reflection unit 6 is used for reflecting the laser beam emitted by the other laser array coupling subsystem with beam correction to the polarization beam combination unit 7, and the polarization beam combination unit 7 is used for combining two groups of laser beams emitted by the two laser array coupling subsystems with beam correction; optionally, the polarization beam combining unit 7 is a polarization beam combining mirror. The spot of the laser beam output from the polarization beam combining unit 7 is shown in fig. 14. It can be seen that the width of the laser beam in the slow axis direction is increased, reducing the residual divergence angle.
A convergence unit 4 and a single core optical fiber 5, the convergence unit 4 being for coupling the combined laser beams to the single core optical fiber 5. Referring to fig. 15, the spot size of the laser beam condensed on the single core optical fiber is very small and can be coupled into the single core optical fiber 5.
The laser array coupling system with the beam correction can increase the width of the laser beam in the slow axis direction, reduce the distance between the laser beams in the fast axis direction and the slow axis direction, lead the laser beams emitted from the beam composite correction prism to be compactly arranged, eliminate the residual divergence angle, converge to obtain smaller spot size, and can be coupled into the single-core optical fiber with smaller diameter. The invention has compact structure and high integration level, reduces the complexity of system dimming, realizes the ordered arrangement of multiple beams and improves the power of the system.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A laser array coupling system with beam correction, comprising:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the light beam correction composite prism comprises two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein the included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angle of each obtuse triangular prism is an obtuse angle, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms by the bottom surfaces of the two obtuse triangular prisms, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism so as to reduce the distance between adjacent laser beams in the slow axis direction;
the laser beam coupling device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling laser beams emitted from the back refraction surfaces of two obtuse triangular prisms to the single-core optical fiber.
2. The beam-corrected laser array coupling system of claim 1, wherein the incident angle of the laser beam refracted from the front refracting surface of the obtuse triangular prism to the bottom surface of the obtuse triangular prism is greater than the total reflection angle of the obtuse triangular prism.
3. The beam-correcting laser array coupling system of claim 2, wherein the beam correcting compound prism further comprises an isosceles triangular prism, the two waist faces of the isosceles triangular prism being partially glued to the bottom faces of the two obtuse triangular prisms, respectively, to form an air gap between the waist faces of the isosceles triangular prism and the bottom faces of the obtuse triangular prisms.
4. The beam-corrected laser array coupling system according to claim 1, wherein the bottom surface of the obtuse triangular prism is coated with a total reflection film to form a total reflection surface.
5. The beam-corrected laser array coupling system of claim 1, wherein the fast axis adjustment unit comprises at least one mirror.
6. The beam-corrected laser array coupling system of claim 1, wherein the first and second sets of laser diodes each comprise at least two laser diodes.
7. The beam-corrected laser array coupling system of claim 1, wherein the condensing unit is a condensing lens.
8. A laser array coupling system with beam correction, comprising:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the light beam correction composite prism comprises isosceles triangular prisms and two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein an included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angle of each obtuse triangular prism is an obtuse angle, two waist surfaces of each isosceles triangular prism are respectively glued with the bottom surfaces of the two obtuse triangular prisms, two waist surfaces of each isosceles triangular prism are plated with a total reflection film to form a total reflection surface, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to rear refraction surfaces of the two obtuse triangular prisms by the two waist surfaces of each isosceles triangular prism and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism so as to reduce the distance between adjacent laser beams in the slow axis direction;
the laser beam coupling device comprises a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling laser beams emitted from the back refraction surfaces of two obtuse triangular prisms to the single-core optical fiber.
9. A laser array coupling system with beam correction, comprising:
two laser array coupling subsystems with beam correction, the two laser array coupling subsystems with beam correction being orthogonally arranged, the laser array coupling subsystems with beam correction comprising:
a laser light source for emitting an array of laser beams, the laser light source comprising a first set of laser diodes and a second set of laser diodes;
a fast axis adjusting unit for reducing a distance between adjacent laser beams in a fast axis direction;
the light beam correction composite prism comprises two obtuse triangular prisms which are identical in structure and symmetrically arranged, wherein the included angle formed by the bottom surfaces of the two obtuse triangular prisms is an acute angle, the vertex angle of each obtuse triangular prism is an obtuse angle, laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively incident to the front refraction surfaces of the two obtuse triangular prisms, are respectively refracted to the bottom surfaces of the two obtuse triangular prisms by the front refraction surfaces of the two obtuse triangular prisms, are respectively totally reflected to the rear refraction surfaces of the two obtuse triangular prisms by the bottom surfaces of the two obtuse triangular prisms, and are respectively emergent from the rear refraction surfaces of the two obtuse triangular prisms; the laser beams emitted from the rear refraction surface are parallel to the laser beams incident from the front refraction surface, the fast axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively vertical to the main sections of the two obtuse triangular prisms, and the slow axes of the laser beams emitted by the first group of laser diodes and the second group of laser diodes are respectively parallel to the main sections of the two obtuse triangular prisms, so that the width of the laser beams in the slow axis direction is increased; the length of the front refraction surface of the obtuse triangular prism is larger than that of the rear refraction surface of the obtuse triangular prism so as to reduce the distance between adjacent laser beams in the slow axis direction;
the laser array coupling subsystem with the beam correction function comprises a reflection unit and a polarization beam combination unit, wherein the polarization beam combination unit is arranged on a path of a laser beam emitted by one laser array coupling subsystem with the beam correction function, the reflection unit is used for reflecting the laser beam emitted by the other laser array coupling subsystem with the beam correction function to the polarization beam combination unit, and the polarization beam combination unit is used for combining two groups of laser beams emitted by the two laser array coupling subsystems with the beam correction function;
the laser beam combiner comprises a converging unit and a single-core optical fiber, wherein the converging unit is used for coupling the combined laser beam to the single-core optical fiber.
10. The beam-corrected laser array coupling system of claim 9, wherein the polarization beam combining unit is a polarization beam combining mirror.
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