CN112260064A - Light beam shrinking device and method thereof - Google Patents
Light beam shrinking device and method thereof Download PDFInfo
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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
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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
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Abstract
The present disclosure provides a beam-shrinking apparatus, comprising: the laser comprises N single-tube semiconductor lasers, a laser beam generator and a laser beam generator, wherein the N single-tube semiconductor lasers are used for generating N laser beams, N-1 single-tube semiconductor lasers form a regular polygon array, and the other 1 single-tube semiconductor laser is positioned at the center of the regular polygon array; the N groups of collimating lenses respectively correspond to the N parallel laser beams, and each group of collimating lenses comprises a fast axis collimating lens and a slow axis collimating lens which are respectively used for collimating the laser beams on the fast axis and the slow axis to obtain the N parallel laser beams; the N-1 flat glass plates respectively correspond to the N-1 parallel laser beams in the regular polygonal array and are used for refracting the N-1 parallel laser beams so as to enable the N-1 parallel laser beams to converge towards the laser beam positioned at the central position. The present disclosure also provides a beam-shrinking method.
Description
Technical Field
The disclosure relates to the technical field of semiconductor lasers, in particular to a beam shrinking device and a method thereof.
Background
Compared with other lasers, the semiconductor laser has the advantages of small size, high electro-optic conversion efficiency, long service life, strong stability and the like, and nowadays, the optical fiber coupling semiconductor laser module is widely applied to optical fiber communication, laser medical treatment and pumping solid lasers, and is called as a fourth-generation light source particularly in the field of industrial processing. In the field of material processing, since the processing of nonferrous metal materials by near-infrared laser is difficult, blue-green semiconductor laser with short wavelength becomes an effective means for solving these technical difficulties due to the high absorption rate of the material. For example, the copper-based material has an absorption of 450nm blue light 5 to 10 times or more of that of 1 μm laser (solid-state, semiconductor laser), but the output power of a blue semiconductor laser is low compared with that of a semiconductor laser in the near-infrared band, and thus the copper-based material does not meet the requirement of industrial processing.
Increasing the output power by combining is one of the effective solutions. At present, a common spatial beam combination method combines a plurality of semiconductor Laser (LD) emitting units into a rectangular array emitting unit for optical fiber coupling, and has the advantages of simple structure, easy elimination of dark space between units, and the disadvantages of mismatch between the rectangular array and the circular optical fiber end surface, and beam combination space waste around the rectangle. The plane closest packing structure can effectively utilize space, further improve the number of beam combination units and improve output power, and the difficulty lies in eliminating dark areas among the light emitting units under the condition of not changing the emission angle of light beams.
Disclosure of Invention
In order TO solve the above problems in the prior art, the present disclosure provides a beam reduction apparatus and a method thereof, which can eliminate a light-emitting dark area between TO single tubes and improve beam quality of a combined beam under the condition of maintaining a beam divergence angle unchanged.
The present disclosure provides a beam-condensing apparatus, including:
the laser comprises N single-tube semiconductor lasers, a laser beam generator and a laser beam generator, wherein the N single-tube semiconductor lasers are used for generating N laser beams, N-1 single-tube semiconductor lasers form a regular polygon array, the other 1 single-tube semiconductor laser is located at the center of the regular polygon array, and N is an integer greater than or equal to 3; the N groups of collimating lenses respectively correspond to the N parallel laser beams, and each group of collimating lenses comprises a fast axis collimating lens and a slow axis collimating lens which are respectively used for collimating the laser beams on the fast axis and the slow axis to obtain the N parallel laser beams; the N-1 flat glass plates respectively correspond to the N-1 parallel laser beams in the regular polygonal array and are used for refracting the N-1 parallel laser beams so as to enable the N-1 parallel laser beams to converge towards the laser beam positioned at the central position.
Furthermore, the N laser beams are firstly collimated on the fast axis of the laser beams through the fast axis collimating mirror and then collimated on the slow axis of the laser beams through the slow axis collimating mirror, so that divergence angles of the laser beams in the directions of the fast axis and the slow axis are reduced, uniformity of the laser beams is improved, and the N parallel laser beams are obtained.
Further, N is equal to 7, a regular polygonal array formed by six single-tube semiconductor lasers is a regular hexagonal array, and the other 1 single-tube semiconductor laser is located at the center of the regular polygonal array and forms plane closest packing distribution.
Furthermore, the N single-tube semiconductor lasers are all TO packaged single-tube semiconductor lasers, and the optical axis distance between any two single-tube semiconductor lasers is 12-20 mm.
Further, N-1 plate glasses are in the shape of a hexahedron, and two end faces for laser beam injection and emission are parallel.
Further, the distance D by which the N-1 parallel laser beams converge toward the laser beam at the center position satisfies the following condition:
wherein L is the distance between the two parallel end faces, n is the refractive index of the flat glass, and theta is the included angle between the laser beam and the two parallel end faces.
Furthermore, the N-1 flat glass plates are made of materials which are highly transparent to the wavelength of 400-500 nm and are made of quartz materials or k9 glass materials.
Furthermore, the distance L between two parallel end faces in the N-1 flat glass sheets ranges from 5mm to 50mm, and the included angle theta between the laser beam and the two parallel end faces ranges from 30 degrees to 60 degrees.
Furthermore, the light beam shrinking device further comprises a copper block clamp, wherein the N single-tube semiconductor lasers are arranged in the copper block clamp, and the contact surfaces of the N single-tube semiconductor lasers and the N single-tube semiconductor lasers are coated with heat-conducting silicone grease for heat dissipation of the N single-tube semiconductor lasers.
Furthermore, the distance between the N single-tube semiconductor lasers and the corresponding N fast-axis collimating lenses is 1-2 mm, the distance between the N fast-axis collimating lenses and the corresponding N slow-axis collimating lenses is 20-40 mm, and the distance between the N slow-axis collimating lenses and the corresponding plate glass is 40-100 mm.
The present disclosure also provides a beam-shrinking method, including:
s1, generating N laser beams, wherein N-1 laser beams form a regular polygon array, the other 1 laser beam is positioned at the center of the regular polygon array, and N is an integer greater than or equal to 3;
s2, aligning the N laser beams on the fast axis and the slow axis respectively to obtain N parallel laser beams;
s3, respectively refracting the N-1 parallel laser beams to make the N-1 parallel laser beams converge to the laser beam at the central position.
The disclosure provides a beam-shrinking device and a method thereof based on a beam-shrinking technology of a semiconductor laser, which can eliminate a light-emitting dark space between TO single tubes and improve the beam quality of a combined beam under the condition of keeping a beam divergence angle unchanged. And under the structure that regular polygon array is regular hexagon array, the device has small volume and high density relative to optical axis because the laser unit accords with the most dense arrangement mode, and the arrangement mode has more central symmetry compared with the common array arrangement, and can reduce the aberration of focusing light spots after being focused by a lens, and compared with other regular polygon array areas, the regular hexagon array structure can achieve the most closely arranged light spot array diagram by combining light beams, thereby further improving the duty ratio and output power of the light beams in unit area.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
fig. 1 schematically shows a structure of a beam reducing apparatus according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a block diagram of a flat glass enclosure according to an embodiment of the present disclosure;
FIG. 3 schematically illustrates a single sheet glass structure according to an embodiment of the disclosure.
Fig. 4 schematically illustrates a diagram of an array of spots before entering a sheet of glass according to an embodiment of the present disclosure.
Fig. 5 schematically illustrates a diagram of an array of spots after refraction into a flat glass according to an embodiment of the disclosure.
Description of reference numerals:
1-single tube semiconductor laser, 2-copper block clamp, 3-fast axis collimating mirror, 4-slow axis collimating mirror, and 5-plate glass.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
An embodiment of the present disclosure provides a beam-shrinking apparatus, including:
the laser device comprises N single-tube semiconductor lasers 1 and a laser processing module, wherein the N single-tube semiconductor lasers 1 are used for generating N laser beams, N-1 single-tube semiconductor lasers 1 form a regular polygon array, the other 1 single-tube semiconductor lasers 1 are located at the center of the regular polygon array, and N is an integer greater than or equal to 3;
the N groups of collimating lenses respectively correspond to the N parallel laser beams, and each group of collimating lenses comprises a fast axis collimating lens 3 and a slow axis collimating lens 4 which are respectively used for collimating the laser beams on the fast axis and the slow axis to obtain the N parallel laser beams;
and the N-1 flat glass plates 5 respectively correspond to the N-1 parallel laser beams in the regular polygonal array and are used for refracting the N-1 parallel laser beams so as to converge the N-1 parallel laser beams to the laser beam at the central position.
Preferably, the N laser beams are firstly collimated on the fast axis of the N fast axis collimating lenses respectively and then collimated on the slow axis of the N slow axis collimating lenses, so that divergence angles of the laser beams in the directions of the fast axis and the slow axis are reduced, uniformity of the laser beams is improved, the N parallel laser beams are obtained, and further optical coupling efficiency in an optical fiber coupling process is improved. The fast axis collimating lenses 3 are all aspheric cylindrical lenses, and the slow axis collimating lenses 4 are all cylindrical lenses.
The rod mirror or convex cylindrical mirror or convex polygonal prism, etc., and the slow axis collimating mirror 4 is a spherical mirror or aspherical mirror or cylindrical mirror, etc.
Preferably, N is equal to 7, the regular polygonal array formed by six single-tube semiconductor lasers 1 is a regular hexagonal array, and the other 1 single-tube semiconductor lasers 1 are located at the center position of the regular polygonal array and form plane closest packing distribution. The laser beams under the regular hexagonal array are refracted by the plate glass 5, the duty ratio of the beams in a unit area can be maximized, compared with other regular polygonal arrays, the light emitting dark areas among the beams are further reduced, the light spot array diagram formed by combining the beams can reach the light spot array diagram which is arranged most closely, and the light output power is further improved.
Preferably, the N single-tube semiconductor lasers 1 are TO-packaged single-tube semiconductor lasers 1, and the optical axis distance between any two of the single-tube semiconductor lasers 1 is 12-20 mm. Compared with single-tube semiconductor lasers packaged in other modes, the TO-packaged single-tube semiconductor laser 1 is smaller in size, larger in output laser beam spot and more suitable for the beam-condensing device; the laser beams within the optical axis distance range are refracted by the flat glass 5, and then the N-1 parallel laser beams positioned at the vertexes of the regular polygon are converged to the laser beam positioned at the central position, so that a better convergence effect is achieved; if the optical axis distance is too large, the distance required by radial movement is also large, so that the requirements on the structure and the length of the plate glass 5 are high, the difficulty of the preparation process is increased, and consumables are wasted.
Preferably, the N-1 plate glasses 5 have a hexahedral shape in which both end surfaces into and out of which the laser beams are incident and emitted are parallel. The two end faces are parallel to each other, so that light enters from one end face, is refracted, and then exits from the opposite end face parallel to the end face, the parallel laser beams after secondary refraction are still parallel laser beams, only radial distance deviation occurs, and the direction of the laser beams is not changed.
In addition, the distance D for converging the N-1 parallel laser beams to the laser beam at the central position meets the following condition:
wherein L is the distance between the two parallel end faces, n is the refractive index of the flat glass, and theta is the included angle between the laser beam and the two parallel end faces.
Preferably, the N-1 flat glasses 5 are made of a material which is highly transparent to wavelengths of 400-500 nm, and are made of a quartz material or a k9 glass material.
Preferably, the distance L between the two parallel end surfaces ranges from 5mm to 50mm, and the included angle theta between the laser beam and the two parallel end surfaces ranges from 30 degrees to 60 degrees. When the length L of the parallel end face of the plate glass 5 is 5-50mm and the included angle theta between the parallel end face of the plate glass and the horizontal plane is 30-60 degrees, the parallel laser beams collimated by the N groups of collimating mirrors are refracted by the plate glass 5 to ensure that the parallel laser beams are refracted out from the opposite side of the parallel end face, but the laser beams are not refracted out through other faces of the plate glass 5 under the conditions that the length is small or long or the angle is unreasonable, so that the refracted laser beams cannot be kept parallel to each other.
Preferably, the beam-condensing device further comprises a copper block clamp 2, the N single-tube semiconductor lasers 1 are arranged in the copper block clamp 2, and the contact surfaces of the copper block clamp 2 and the N single-tube semiconductor lasers 1 are coated with heat-conducting silicone grease for dissipating heat of the N single-tube semiconductor lasers 1.
Preferably, in order to achieve a better beam-shrinking effect, the distance between the N single-tube semiconductor lasers 1 and the corresponding N fast-axis collimating mirrors 3 is 1-2 mm, the distance between the N fast-axis collimating mirrors 3 and the corresponding N slow-axis collimating mirrors 4 is 20-40 mm, and the distance between the N slow-axis collimating mirrors 4 and the corresponding flat glass 5 is 40-100 mm.
As shown in fig. 1 to 3, the beam-condensing apparatus in some embodiments of the present disclosure includes 7 single-tube semiconductor lasers 1 arranged in a copper block holder 2, which constitutes a regular hexagon and a planar closest-packed structure at the center (seven points in total). 7 single-tube semiconductor lasers 1 for generating 7 laser beams; the 7 laser beams are collimated on the fast axis and the slow axis respectively through a fast axis collimating mirror 3 and a slow axis collimating mirror 4 to obtain 7 laser beams which are parallel to each other; the 7 parallel laser beams are refracted through the six plate glasses 5 so that the six parallel laser beams positioned at the vertices of the regular hexagonal array are converged toward the laser beam positioned at the center.
In order to achieve a better heat dissipation effect, red copper is preferably selected as the material of the copper block clamp 2.
In some embodiments of the present disclosure, two parallel end surfaces of six plate glasses 5 for laser beam injection and exit are isosceles trapezoids, the six plate glasses 5 are connected by ultraviolet glue, and they mutually enclose a hollow regular hexagonal prism, six peripheral beams at the vertex of the regular hexagon respectively pass through the six plate glasses 5 and all translate radially to a central beam, and a beam at the center of the regular hexagon passes through the hollow part of the regular hexagonal prism. Wherein, through experimental verification, the method is based on
The calculation of the formula 1 can obtain that the plate glass 5 is made of k9 glass, the refractive index n of the plate glass is 1.516, and when the distance D of the parallel laser beam needing to be translated in the radial direction is 5mm, if the included angle between the laser beam and the two parallel end faces in the plate glass 5 is 45 degrees, the required length of the plate glass 5 is 21.17 mm; if the included angle between the laser beam and the two parallel end faces in the plate glass 5 is 60 degrees, the length of the plate glass 5 is 29.24 mm; when the distance D by which the parallel laser beam is to be radially translated is 10mm, the length of the plate glass 5 is required to be 24.34mm if the angle between the laser beam and the two parallel end faces of the plate glass 5 is 45 °. The flat glass 5 under the structure can make the parallel laser beams reach the plane closest packing structure after radial translation.
Fig. 4 is a diagram showing an array of laser beam spots before entering the flat glass 5 in some embodiments of the present disclosure, where there is a large gap between the spots due to a mechanical structure, and the duty ratio of the beam per unit area is small.
Fig. 5 is a laser beam spot array diagram after entering the flat glass 5 and moving radially in some embodiments of the present disclosure, a gap between spots is obviously reduced, a duty ratio of a light beam in a unit area is increased, and a spot structure is a planar closest packing structure with an optimal effect.
The method and the device have the advantages that the peripheral light beams are translated towards the central light beam, gaps among light spots are eliminated or reduced, the diameter of the combined light beam is reduced under the condition that the divergence angle of the combined light beam is kept unchanged, the light beam quality is improved, and higher coupling efficiency can be provided for further processing, such as optical fiber coupling.
Those skilled in the art will understand that the embodiment of the flat glass 5 shown in fig. 2 and fig. 3 does not limit the specific structure of the flat glass 5, and in other embodiments, the flat glass 5 may also be other structures such as parallel flat glass, or different arrangement of the flat glass with the same structure, all falling within the scope of the present disclosure.
In addition, the structural size of the flat glass 5 in some embodiments of the present disclosure is not limited to the above-mentioned values to achieve the planar closest packing structure with the best light spot structure effect, and the dimensional values calculated by formula 1 in the above range can achieve this effect.
The present disclosure also provides a beam-shrinking method, including:
s1, generating N laser beams, wherein N-1 laser beams form a regular polygon array, the other 1 laser beam is positioned at the center of the regular polygon array, and N is an integer greater than or equal to 3;
s2, aligning the N laser beams on the fast axis and the slow axis respectively to obtain N parallel laser beams;
s3, respectively refracting the N-1 parallel laser beams to make the N-1 parallel laser beams converge to the laser beam at the central position.
Preferably, the step S1 uses N single-tube semiconductor lasers 1 to form a regular polygon array, and generates N laser beams, where N-1 laser beams are located at the vertices of the regular polygon array, and the other 1 laser beam is located at the center of the regular polygon array.
Preferably, in the step S2, N laser beams first pass through N fast axis collimating mirrors 3 to be collimated on the fast axis thereof, and then pass through N slow axis collimating mirrors 4 to be collimated on the slow axis thereof, so that divergence angles of the laser beams in the directions of the fast axis and the slow axis thereof are reduced, uniformity of the laser beams is improved, the N parallel laser beams are obtained, and further, optical coupling efficiency in the optical fiber coupling process is improved. The fast axis collimating lenses 3 are aspheric cylindrical lenses, and the slow axis collimating lenses 4 are cylindrical lenses.
Preferably, the N-1 parallel laser beams in S3 are refracted through N-1 flat glass 5 or cylindrical glass 5 or hexagonal prism glass 5 or other shaped glass, so that the N-1 parallel laser beams converge toward the laser beam at the central position. The glass in other shapes such as the plate glass 5, the cylindrical glass 5, the hexagonal prism glass 5 and the like is a quartz material or a k9 glass material, two end faces for laser beam incidence and emission are parallel, the parallel action of the two end faces is to enable light to be incident from one end face to be refracted, then the light is emitted from the opposite end face parallel to the end face, the parallel laser beam after secondary refraction is still a parallel laser beam, only radial distance deviation occurs, and the direction of the laser beam is not changed.
Preferably, the beam-shrinking method further comprises:
s4, irradiating the laser beam refracted by the flat glass 5 or the cylindrical glass 5 or the prismatic glass 5 on quartz flat glass or k9 glass, and observing a light spot array diagram of the laser beam by using a CCD camera; when the light spot array diagram shows that the distance between each light spot is larger, the refractive index N of the flat glass 5 or the cylindrical glass 5 or the hexagonal prism type glass 5, the distance L between the two parallel end surfaces and the included angle theta between the parallel laser beams and the two parallel end surfaces are changed according to the formula 1, so that the N-1 parallel laser beams are radially translated towards the laser beams at the central position to output the light spot array diagram with the most densely arranged planes.
Preferably, the N single-tube semiconductor lasers 1 are disposed in a copper block holder 2, and a contact surface of the copper block holder 2 and the N single-tube semiconductor lasers 1 is coated with a thermal grease for dissipating heat of the N single-tube semiconductor lasers 1.
Preferably, in order to achieve a better beam-shrinking effect, the distance between the N single-tube semiconductor lasers 1 and the N corresponding fast-axis collimating mirrors 3 is 1-2 mm, the distance between the N fast-axis collimating mirrors 3 and the N corresponding slow-axis collimating mirrors 4 is 20-40 mm, and the distance between the N slow-axis collimating mirrors 4 and the corresponding flat glass is 40-100 mm.
As shown in fig. 1 TO 3, in some embodiments of the present disclosure, N is equal TO 7, 7 TO packaged single-tube semiconductor lasers 1 are used TO form a regular hexagonal array, another 1 TO packaged single-tube semiconductor laser 1 is located at a central position of the regular polygonal array and forms a plane closest packing distribution, the 7 single-tube semiconductor lasers 1 output 7 laser beams, 6 laser beams form the regular polygonal array, another 1 laser beam is located at a central position of the regular polygonal array, and an optical axis distance between any two TO packaged single-tube semiconductor lasers 1 is 12 TO 20 mm. 7 laser beams generated by the 7 TO-packaged single-tube semiconductor lasers 1 are sequentially and respectively collimated by the 7 fast axis collimating lenses 3 and the 7 slow axis collimating lenses 4 TO obtain 7 parallel laser beams. Then, 6 parallel laser beams of the 7 parallel laser beams are refracted through the 6 flat glasses 5, so that the six parallel laser beams positioned at the vertices of the regular hexagonal array are converged toward the laser beam positioned at the center.
In some embodiments of the present disclosure, the calculation can be performed according to formula 1, and experiments prove that when the distance L between the two parallel end surfaces is 5-50mm, and the included angle θ between the laser beam and the two parallel end surfaces is 30-60 °, the laser beam with the radial distance D in the range of 4-13 mm can be radially translated to achieve the best effect of converging the laser beam toward the central position, that is, the best beam-converging effect is achieved, thereby reducing the process preparation requirements of the glass for refracting the laser beam. When the length L of the parallel end face of the plate glass 5 is 5-50mm and the included angle theta between the parallel end face of the plate glass and the horizontal plane is 30-60 degrees, the parallel laser beams collimated by the N groups of collimating mirrors are refracted by the plate glass 5 to ensure that the parallel laser beams are refracted out from the opposite side of the parallel end face, but the laser beams are not refracted out through other faces of the plate glass 5 under the conditions that the length is small or long or the angle is unreasonable, so that the refracted laser beams cannot be kept parallel to each other.
Fig. 5 shows a laser beam spot array diagram after entering the flat glass 5 and moving radially according to some embodiments of the present disclosure, where gaps between spots are obviously reduced, duty ratio of light beams in a unit area is increased, and a spot structure is a planar closest packing structure with the best effect.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the disclosure can be made to the extent not expressly recited in the disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
While the disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.
Claims (10)
1. A beam-reducing apparatus, comprising:
the laser comprises N single-tube semiconductor lasers (1) and a laser beam generator, wherein the N-1 single-tube semiconductor lasers (1) form a regular polygon array, the other 1 single-tube semiconductor lasers (1) are located at the center of the regular polygon array, and N is an integer greater than or equal to 3;
the N groups of collimating lenses respectively correspond to the N parallel laser beams, and each group of collimating lenses comprises a fast axis collimating lens (3) and a slow axis collimating lens (4) which are respectively used for collimating the laser beams on the fast axis and the slow axis to obtain the N parallel laser beams;
and the N-1 flat glass (5) respectively corresponds to the N-1 parallel laser beams in the regular polygon array and is used for refracting the N-1 parallel laser beams so as to converge the N-1 parallel laser beams to the laser beam at the central position.
2. The beam reduction device according to claim 1, wherein N is equal to 7, and the regular polygon array is a regular hexagon array.
3. The beam-condensing device according TO claim 1, wherein said N single-tube semiconductor lasers are TO-packaged single-tube semiconductor lasers, and the optical axis distance between any two of them is 12-20 mm.
4. A beam-reducing device according to claim 1, wherein said N-1 plate glasses (5) have a hexahedral shape with two end faces for laser beam incidence and emission being parallel.
5. The beam reduction device according to claim 4, wherein the distance D for converging the N-1 parallel laser beams to the laser beam at the central position satisfies the following condition:
wherein L is the distance between the two parallel end faces, n is the refractive index of the flat glass (5), and theta is the included angle between the laser beam and the two parallel end faces.
6. The beam-shrinking apparatus according to claim 1 or 4, wherein said N-1 flat glasses (5) are made of a material highly transparent to wavelengths of 400-500 nm, and are made of quartz material or k9 glass material.
7. The beam-condensing device of claim 6, wherein the distance L between said two parallel end faces ranges from 5mm to 50mm, and the angle θ between said laser beam and said two parallel end faces ranges from 30 ° to 60 °.
8. The beam reduction apparatus according to claim 1, further comprising:
copper billet anchor clamps (2), N single tube semiconductor laser (1) set up in copper billet anchor clamps (2), its with N single tube semiconductor laser's contact surface scribbles heat conduction silicone grease, be used for right N single tube semiconductor laser's heat dissipation.
9. The beam-shrinking apparatus according to claim 1, wherein the distance between the N single-tube semiconductor lasers (1) and the corresponding N fast-axis collimating mirrors (3) is 1-2 mm, the distance between the N fast-axis collimating mirrors (3) and the corresponding N slow-axis collimating mirrors (4) is 20-40 mm, and the distance between the N slow-axis collimating mirrors (4) and the corresponding flat glass (5) is 40-100 mm.
10. A method of beam-shrinking comprising:
s1, generating N laser beams, wherein N-1 laser beams form a regular polygon array, the other 1 laser beam is positioned at the center of the regular polygon array, and N is an integer greater than or equal to 3;
s2, collimating the N laser beams on the fast axis and the slow axis respectively to obtain N parallel laser beams;
and S3, respectively refracting the N-1 parallel laser beams to make the N-1 parallel laser beams converge towards the laser beam at the central position.
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| US20050063435A1 (en) * | 2003-07-10 | 2005-03-24 | Hirofumi Imai | Semiconductor laser device and solid-state laser device using same |
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