CN219065805U

CN219065805U - Optical combination lens and LDA optical fiber coupling system

Info

Publication number: CN219065805U
Application number: CN202223150095.4U
Authority: CN
Inventors: 闫祥龙; 罗妮; 陈金珠
Original assignee: Huatian Huichuang Technology Xi'an Co ltd
Current assignee: Huatian Huichuang Technology Xi'an Co ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-05-23
Anticipated expiration: 2032-11-25

Abstract

The utility model discloses an optical combination lens and an LDA optical fiber coupling system, wherein the optical combination lens comprises base glass; the front center of the base glass is provided with a plurality of hexagonal lenses in an array manner, and the back center of the base glass is provided with an even aspheric surface. The LDA optical fiber coupling system comprises a semiconductor laser array, an optical fiber and an optical combination lens; the semiconductor laser array faces to the front center position of the optical combination lens, and the optical fiber faces to the back center position of the optical combination lens; the semiconductor laser array is formed by arranging a plurality of LD chip arrays, the number of the hexagonal lenses is the same as that of the LD chips, the size of the hexagonal lenses is larger than that of the LD chips, and the whole size of the hexagonal lens array is larger than that of the semiconductor laser array; the numerical aperture of the even aspheric surface is smaller than that of the optical fiber. The light of the semiconductor laser array can be efficiently coupled into the optical fiber.

Description

Optical combination lens and LDA optical fiber coupling system

Technical Field

The utility model belongs to the field of optical coupling, and relates to an optical combination lens and an LDA optical fiber coupling system.

Background

In recent years, with the rapid development of high-power solid-state lasers and fiber lasers, high-power semiconductor Lasers (LD) and arrays (LDA) thereof have been widely used in the fields of fiber communication, industrial processing, medical diagnosis, environmental monitoring, and national defense due to their advantages of small size, high efficiency, simple structure, easy modulation, easy integration, and the like. However, the large area array and large divergence angle of the high-power semiconductor laser array are the bottleneck of application, and in the current application process, the light rays of the semiconductor laser array cannot be directly coupled into the optical fiber, so that the application of the semiconductor laser array is limited.

Disclosure of Invention

The present utility model is directed to overcoming the drawbacks of the prior art described above, and providing an optical combiner lens and LDA fiber coupling system that can efficiently couple light from a semiconductor laser array into an optical fiber.

In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:

an optical combination lens comprising a base glass;

a plurality of hexagonal lenses are arranged in an array manner at the front center of the base glass, and the hexagonal lens array is square as a whole; the center of the back surface of the base glass is provided with an even aspheric surface.

Preferably, the number of hexagonal lenses is 16-37.

Preferably, the diameter of the even aspheric surface is 0.75-2.6mm, and the thickness is 0.14-2.1mm.

Preferably, the even aspherical diameter is 0.4-0.8mm larger than the side length of the hexagonal lens array.

Preferably, both the hexagonal lens and the even aspheric surface are made of UV glue with a refractive index of 1.515 and an abbe number of 54.

An LDA optical fiber coupling system comprises a semiconductor laser array, an optical fiber and an optical combination lens;

the semiconductor laser array faces to the front center position of the optical combination lens, and the optical fiber faces to the back center position of the optical combination lens; the semiconductor laser array is formed by arranging a plurality of LD chip arrays, the number of the hexagonal lenses is the same as that of the LD chips, the size of the hexagonal lenses is larger than that of the LD chips, and the whole size of the hexagonal lens array is larger than that of the semiconductor laser array; the numerical aperture of the even aspheric surface is smaller than that of the optical fiber.

Preferably, the hexagonal lens has a size greater than 90-420um of the LD chip size.

Preferably, the number of LD chips is 16-37, and the luminous surface is 3-8um; the numerical aperture of the fiber was 0.12 and the core diameter was 62.5um.

Preferably, the distance between the semiconductor laser array and the hexagonal lens is not more than 0.14mm, and the distance between the even aspheric surface and the end face of the optical fiber is not less than 1.32mm.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, glass is taken as a substrate, a plurality of hexagonal lenses are arranged in an array manner at the center of the front surface of the substrate glass, even-order aspheric surfaces are arranged at the center of the back surface of the substrate glass to form the optical combination lens, the hexagonal lens array can collimate light beams of the semiconductor laser array, then the light beams are focused through the even-order aspheric surface optical combination lens and finally enter the optical fiber, so that the light rays of the semiconductor laser array are effectively coupled into the optical fiber, and the optical fiber coupling requirement is met.

Furthermore, the hexagonal lens and the even aspheric surface are both made of UV glue, can be manufactured by using a WLO process, is low in cost, and can be used for manufacturing hundreds of optical combination lenses on one wafer by one-time embossing, so that a foundation is laid for mass production.

Drawings

FIG. 1 is a three-dimensional perspective view of an optical combination lens of the present utility model;

FIG. 2 is a schematic side view of an optical combination lens of the present utility model;

FIG. 3 is a schematic front view of an optical lens assembly according to the present utility model;

FIG. 4 is a schematic view of the back of an optical combination lens of the present utility model;

FIG. 5 is a schematic diagram of an LDA fiber coupling system according to the present utility model;

fig. 6 is a schematic view of an LDA light source according to the present utility model.

Wherein: 1-hexagonal lenses; 2-base glass; 3-even aspherical; a 4-semiconductor laser array; 5-an optical combination lens; 6-optical fiber; 7-LD chip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model; all other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, an optical combination lens 5 according to the present utility model includes a base glass 2.

A plurality of hexagonal lenses 1 are arranged in an array manner in the center of the front face of the base glass 2, and the array of the hexagonal lenses 1 is square as a whole; the center of the back surface of the base glass 2 is provided with an even aspherical surface 3.

As shown in fig. 3, the front surface of the optical combination lens 5 is an array of hexagonal lenses 1, which has the function of collimating light beams corresponding to a light source, the whole array of hexagonal lenses 1 is square, and the number of hexagonal lenses 1 is 16-37.

As shown in FIG. 4, the diameter of the even aspherical surface 3 is 0.75-2.6mm and the thickness is 0.14-2.1mm, and the diameter of the even aspherical surface 3 is 0.4-0.8mm larger than the side length of the hexagonal lens 1 array according to the thickness of the base glass 2.

The optical combination lens 5 is complicated to manufacture by the conventional process, firstly, the size is small, the optical combination lens is not easy to manufacture, secondly, the hexagonal array and the aspheric surface are required to be independently manufactured, the manufacturing cost is relatively high, and the size is not small. According to the utility model, a WLO process is adopted, the hexagonal lens 1 and the even aspheric surface 3 are both made of UV glue, and are stamped on a glass substrate, so that the structure is simple, the cost is low, hundreds of optical combined lenses 5 can be stamped on one Wafer at a time, and a foundation is laid for mass production.

Refractive index of UV glue: n=1.515, and the dispersion coefficient vd=54.

Numerical aperture NA, which describes the size of the cone angle of the optical combination lens 5, in the optical field, which determines the light receiving power and spatial resolution of the optical combination lens 5, and the numerical aperture, which describes the size of the cone angle of the light entering and exiting the optical fiber 6, in the optical fiber 6, are introduced. Optical parameter product the beam quality is an important parameter describing the spatial characteristics of the laser beam, and it is more convenient to describe the beam quality of the LD by using the beam parameter product (beam parameter product, BPP) when the LD fiber 6 is coupled. BPP is defined as the product of the beam waist radius of the spot and the beam far field divergence half angle in millimeters by milliradians (mm mrad); in order to couple the light beam into the optical fiber 6, it is then necessary to: 1. the converging light spot is smaller than the diameter of the fiber core of the optical fiber 6. 2. The numerical aperture of the even aspherical surface 3 is smaller than that of the optical fiber 6. 3. The optical parameter product of the fast and slow axes is smaller than that of the optical fiber 6.

As shown in fig. 5, the LDA fiber 6 coupling system according to the present utility model comprises a semiconductor laser array 4, the above-mentioned optical combination lens 5 and the fiber 6.

The semiconductor laser array 4 is directed to the front center position of the optical combining lens 5, and the optical fiber 6 is directed to the rear center position of the optical combining lens 5.

As shown in fig. 6, the semiconductor laser array 4 adopts 16-37 LD chips 7 to arrange in an array, the whole can select LD chips 7 with different luminous surface sizes under the condition of meeting the requirement of coupling efficiency, and the coupling efficiency of the structure is 55% when the luminous surface is larger than 12 um; in this embodiment, the semiconductor laser array 4 adopts a 905nm band regular hexagonal lens 1 array light source, and total 19 LD chips 7 with 5um light emitting surfaces, and the divergence angles are all ±12°.

The numerical aperture of the optical fiber 6 was 0.12 and the core diameter was 62.5um.

The front surface of the optical combination lens 5 is provided with a hexagonal lens 1 array which corresponds to a light source and plays a role in collimating light beams, the number of the hexagonal lenses 1 is the same as that of the LD chips 7, the hexagonal lens 1 array corresponds to the LD light emitting surfaces one by one, the single hexagonal lens 1 is slightly larger than the LD chips 7, the size of the hexagonal lens 1 is larger than the size 90-420um of the LD chips 7 according to the difference of object distance ranges, the LD chips 7 have a certain light emitting angle, the hexagonal lens 1 array is square in whole and larger than the whole circumscribed circle of the semiconductor laser array 4 in whole in order to facilitate processing design.

The numerical aperture of the even aspheric surface 3 is smaller than that of the optical fiber 6, and the preferred even aspheric surface 3 in this embodiment has a diameter of 1.2mm and a thickness of 0.6mm, and the diameter of the even aspheric surface 3 is larger than the side length of the hexagonal lens 1 array because the light beam cannot be completely collimated by the hexagonal lens 1 array or has a certain divergence angle.

The distance between the semiconductor laser array 4 and the hexagonal lens 1 is not more than 0.14mm, and the distance between the even aspherical surface 3 and the end face of the optical fiber 6 is not less than 1.32mm. The preferred distance between the semiconductor laser array 4 and the hexagonal lens 1 in this embodiment is 0.14mm, the distance between the even aspherical surface 3 and the end face of the optical fiber 6 is 1.32mm, and the overall thickness of the optical combination lens 5 is 0.6mm.

The hexagonal lens 1 array collimates the light beam of the semiconductor laser array 4, and then the collimated light beam is focused by the even aspheric 3 optical combination lens 5 and finally enters the optical fiber 6, wherein in the embodiment, the light spot is 60um less than the fiber core diameter 62.5um, the light emitting light parameter product of the semiconductor laser array 4 after calculation optimization is 3.61mm/mrad, and the parameter product of the optical fiber 6 is 3.75mm/mrad; the divergence angle of the light spots is 6.8 degrees, the receiving angle of the optical fiber 6 is 6.9 degrees, and the coupling requirement of the optical fiber 6 is met.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the patent should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant not be considered to be a part of the disclosed subject matter.

Claims

1. An optical combination lens, characterized by comprising a base glass (2);

a plurality of hexagonal lenses (1) are arranged in an array manner on the front center of the base glass (2), and the array of the hexagonal lenses (1) is square as a whole; the center of the back of the base glass (2) is provided with an even aspheric surface (3).

2. Optical combination lens according to claim 1, characterized in that the number of hexagonal lenses (1) is 16-37.

3. An optical combination lens according to claim 1, characterized in that the even aspherical surface (3) has a diameter of 0.75-2.6mm and a thickness of 0.14-2.1mm.

4. An optical combination lens according to claim 1, characterized in that the even aspherical surface (3) diameter is 0.4-0.8mm larger than the side length of the hexagonal lens (1) array.

5. Optical combination lens according to claim 1, characterized in that the hexagonal lens (1) and the even aspherical surface (3) are made of UV glue with a refractive index of 1.515 and an abbe number of 54.

6. An LDA fiber coupling system comprising a semiconductor laser array (4), an optical fiber (6) and an optical combination lens (5) according to any of claims 1-5;

the semiconductor laser array (4) faces to the front center position of the optical combination lens (5), and the optical fiber (6) faces to the back center position of the optical combination lens (5); the semiconductor laser array (4) is formed by arranging a plurality of LD chips (7) in an array manner, the number of the hexagonal lenses (1) is the same as that of the LD chips (7), the size of the hexagonal lenses (1) is larger than that of the LD chips (7), and the overall size of the hexagonal lenses (1) is larger than that of the semiconductor laser array (4); the numerical aperture of the even aspherical surface (3) is smaller than that of the optical fiber (6).

7. The LDA fiber coupling system of claim 6, wherein the hexagonal lens (1) has a size greater than 90-420um of the LD chip (7).

8. The LDA fiber coupling system of claim 6, wherein the even aspheric (3) diameter is 0.4-0.8mm greater than the side length of the hexagonal lens (1) array.

9. The LDA fiber coupling system according to claim 6, wherein the number of LD chips (7) is 16-37, and the light emitting surface is 3-8um; the numerical aperture of the optical fiber (6) was 0.12 and the core diameter was 62.5um.

10. The LDA fiber coupling system according to claim 6, wherein the distance between the semiconductor laser array (4) and the hexagonal lens (1) is 0.14mm or less, and the distance between the even-order aspheric surface (3) and the end face of the optical fiber (6) is 1.32mm or more.