CN112578572A

CN112578572A - Optical element and optical module

Info

Publication number: CN112578572A
Application number: CN202011447990.5A
Authority: CN
Inventors: 蔡磊
Original assignee: Focuslight Technologies Inc
Current assignee: Focuslight Technologies Inc
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-03-30

Abstract

The embodiment of the application provides an optical element and optical module, belong to optics technical field, optical element has the incident surface, the emergent surface and along two first plane of reflection that the main optical axis symmetry set up and two second plane of reflection that set up along the main optical axis symmetry in slow axis direction at fast axis direction, the light beam of light source outgoing is incited the main optical axis respectively through the incident surface to and behind two first plane of reflection and/or two second plane of reflection, through the emergent surface outgoing, in order to form the stack facula. The light beam emitted by the light source is respectively incident on the main optical axis and the two first reflecting surfaces or the two second reflecting surfaces or the two first reflecting surfaces and the two second reflecting surfaces through the incident surface and then is emitted through the exit surface, the light beam is divided into a plurality of parts and rearranged, the light beam distribution characteristic is changed, the light beam is homogenized, the light spot superposition is realized, the light source has no limitation requirement, the light spot change is carried out according to different light sources, the size is small, the structure is compact, and the cost is low; the light spot form is diversified, and the flexibility is high, adapts to different demands.

Description

Optical element and optical module

Technical Field

The application relates to the technical field of optics, in particular to an optical element and an optical module.

Background

In the prior art, no optical element can simultaneously realize the following 4 functions: (1) changing the beam profile; (2) cutting the beam and rearranging the beam; (3) overlapping light beams of different application scenes; (4) the beam is homogenized.

The prior art realizes the above functions by combining a plurality of optical elements, which results in non-concise optical structure design, installation and adjustment deviation, high economic cost and other disadvantages of system combination.

Disclosure of Invention

An object of the present application is to provide an optical element capable of changing a beam profile; cutting the beam and rearranging the beam; overlapping light beams of different application scenes; the beam is homogenized.

On the other hand, this application still provides an optical module.

The embodiment of the application is realized as follows:

an aspect of the embodiment of this application provides an optical element, optical element has incident surface, emergent surface and follows in the fast axis direction two first plane of reflection that optical element's the main optical axis symmetry set up with follow in the slow axis direction two second plane of reflection that optical element's the main optical axis symmetry set up, the emergent light beam of light source warp the incident surface is incited respectively main optical axis and two first plane of reflection and/or two behind the second plane of reflection, warp the emergent surface is emergent to form the stack facula.

Optionally, the first reflecting surface and the second reflecting surface comprise an arc surface, and the arc surface is close to the exit surface.

Optionally, the curved surface comprises any one of a paraboloid, a hyperboloid and an aspheric surface.

Optionally, the arc surface includes a plurality of sub arc surfaces connected in sequence, and the arc directions of adjacent sub arc surfaces are different.

Optionally, the sub-arc surface is a high-order ellipsoidal aspheric surface.

Optionally, the incident surface includes a first incident surface and a second incident surface that are connected to each other and symmetrically disposed along the main optical axis.

Optionally, a third incident surface is further connected between the first incident surface and the second incident surface.

Optionally, the arc surface, the sub-arc surface, and the third incident surface are respectively provided with a plurality of microstructures connected in sequence to adjust the direction of the incident beam.

Optionally, the microstructure includes any one of a concave surface, a convex surface, a serrated surface, and a bidirectional free-form surface.

Optionally, the optical element is an optical waveguide.

Another aspect of the embodiments of the present application provides an optical module, which includes a compression mirror and the above optical element, wherein the compression mirror is disposed between a light source and the optical element.

Optionally, the optical module further includes a laser light source.

The beneficial effects of the embodiment of the application include:

the optical element provided by the embodiment of the application is provided with an incident surface and a reflecting surface, and also provided with two first reflecting surfaces which are symmetrical along a main optical axis in a fast axis direction and two second reflecting surfaces which are symmetrical along the main optical axis in a slow axis direction, wherein light beams emitted by a light source are respectively incident on the main optical axis and the two first reflecting surfaces through the incident surface, and total reflection is completed on the first reflecting surfaces; or the light enters the main optical axis and the two second reflecting surfaces, and the total reflection is finished on the second reflecting surfaces; or the light beam enters the main optical axis, the two first reflection surfaces and the two second reflection surfaces and then exits from the exit surface, and the light beam is divided into a plurality of parts, and each part forms a superposition light spot in a far field. Besides the main optical axis, the light beam is reflected only on the first reflecting surface or only on the second reflecting surface to form a linear light spot superposition in a far field, and the light beam is simultaneously reflected on the first reflecting surface and the second reflecting surface to form a surface light spot superposition in the far field. The embodiment of the application has the advantages that only one optical element is arranged, the optical element is provided with the first reflecting surface and the second reflecting surface, so that a light beam incident to the optical element is divided into a plurality of parts, the light beam is cut and rearranged, the distribution characteristic of the light beam is changed, the light beam is homogenized, light spot superposition can be realized, the light spot superposition can be applied to light beam superposition of different scenes, the light source has no limitation requirement, light spot change can be carried out according to different light sources, and the optical element is small in size, compact in structure and low in cost; moreover, the light spot has diversified forms and high flexibility, and can adapt to different requirements.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 2 is a diagram illustrating an energy distribution of a light spot formed by an optical module according to an embodiment of the present disclosure;

FIG. 3 is a second schematic view of an optical module according to an embodiment of the present disclosure;

FIG. 4 is a second distribution diagram of the energy of the light spot formed by the optical module according to the embodiment of the present disclosure;

FIG. 5 is a third schematic view illustrating an optical module according to an embodiment of the present disclosure;

FIG. 6 is a third distribution diagram of the energy of the light spot formed by the optical module according to the present embodiment;

FIG. 7 is a fourth schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 8 is a fourth distribution diagram of the energy of the light spot formed by the optical module according to the embodiment of the present disclosure;

FIG. 9 is a fifth exemplary diagram of an optical module according to an embodiment of the present disclosure;

FIG. 10 is a fifth diagram illustrating an energy distribution of a light spot formed by the optical module according to an embodiment of the present disclosure;

FIG. 11 is a sixth schematic structural view of an optical module according to an embodiment of the present application;

FIG. 12 is a seventh schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 13 is a sixth diagram illustrating a distribution of spot energies formed by the optical module according to an embodiment of the present disclosure;

FIG. 14 is a seventh distribution diagram of the energy of the light spot formed by the optical module according to the embodiment of the present disclosure;

FIG. 15 is an eighth schematic structural view of an optical module according to an embodiment of the present application;

FIG. 16 is an eighth distribution diagram of the energy of the light spot formed by the optical module according to the embodiment of the present disclosure;

FIG. 17 is a ninth schematic view of an optical module according to an embodiment of the present disclosure;

FIG. 18 is a ninth illustration showing an energy distribution diagram of a light spot formed by the optical module according to an embodiment of the disclosure;

FIG. 19 is a cross-sectional view of an optical module according to an embodiment of the present disclosure;

FIG. 20 is an eleventh schematic view of an optical module according to an embodiment of the present disclosure;

FIG. 21 is a twelfth schematic structural view of an optical module according to an embodiment of the present disclosure;

FIG. 22 is a thirteen schematic structural diagrams of an optical module according to an embodiment of the present application;

FIG. 23 is a fourteenth schematic structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 24 is a fifteen-shown schematic structural diagram of an optical module according to an embodiment of the present application.

Icon 11-compression mirror; 12-an optical element; 120-a first reflective surface; 121-microstructure; 122-minor arc surface; 123-a first entrance face; 124-a second incidence plane; 125-a third plane of incidence; 13-receiving surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Referring to fig. 1, the present embodiment provides an optical element 12, where the optical element 12 includes an incident surface, an exit surface, two first reflection surfaces 120 symmetrically disposed along a main optical axis of the optical element 12 in a fast axis direction, and two second reflection surfaces symmetrically disposed along the main optical axis of the optical element 12 in a slow axis direction, and light beams emitted from a light source respectively enter the main optical axis through the incident surface, and after passing through the two first reflection surfaces 120 and/or the two second reflection surfaces, exit through the exit surface, and are received by a receiving surface 13, so as to form a superimposed light spot.

The optical element 12 has an entrance face and an exit face, both perpendicular to the main optical axis, the optical element 12 having one or more side faces in a direction parallel to the main optical axis. Having multiple sides, for example, the optical element 12 may be an optical waveguide that is a tetrahedral structure. Having one side, the optical element 12 is a cylinder or cone with a circumferential side. The present embodiment is not particularly limited to this, and may be set according to actual needs.

However, whether the side surface is a circumferential surface or a multi-surface, the optical element 12 has two first reflection surfaces 120 in the fast axis direction, and the two first reflection surfaces 120 are symmetrically arranged along the main optical axis; the slow axis direction is provided with two second reflecting surfaces which are symmetrically arranged along the main optical axis.

After the light beam emitted from the light source enters the optical element 12 through the incident surface, there are three situations: first, total reflection is formed in the fast axis direction, the light beam is divided into three beams, one beam is emitted to the far field through the main optical axis, the two beams are respectively emitted after being incident to the two first reflecting surfaces 120, and the superimposed line light spot is formed in the far field. And secondly, total reflection is formed in the slow axis direction, the light beam is divided into three beams, one beam is emitted to a far field through the main optical axis, the two beams are respectively emitted after being incident into the two second reflecting surfaces, and a superposed line light spot is formed in the far field. And thirdly, total reflection is formed in the directions of the fast axis and the slow axis, at the moment, the light beams are respectively emitted to a far field through the main optical axis, emitted after passing through the two first reflecting surfaces 120, and further emitted through the two second reflecting surfaces, and a superposition surface light spot is formed in the far field, so that the light beam superposition device can be applied to light beam superposition of different scenes.

The light source is not particularly limited in this embodiment either, and the light source may be a linear light source or a surface light source. The light source is preferably a laser light source. In the following embodiments, a semiconductor laser light source is taken as an example for explanation.

The width of the entrance face is smaller or larger than the width of the exit face in a direction perpendicular to the main optical axis. As shown in fig. 1, the width of the incident surface of the optical element 12 is greater than that of the exit surface, i.e. the entrance end is a large end and the exit end is a small end; or the width of the incident surface of the optical element 12 shown in fig. 9 is smaller than that of the emergent surface, i.e. the entrance end is a small end and the exit end is a large end, so as to realize different superposed light spots.

A compression mirror 11 or a beam expander may also be provided between the light source and the optical element 12, and the size of the light spot is compressed by the compression mirror 11 or the beam expander.

In the optical element 12 provided in the embodiment of the present application, the optical element 12 has an incident surface and a reflection surface, and further has two first reflection surfaces 120 symmetrical along a main optical axis in a fast axis direction and two second reflection surfaces symmetrical along the main optical axis in a slow axis direction, light beams emitted from a light source respectively enter the main optical axis and the two first reflection surfaces 120 through the incident surfaces, and total reflection is completed on the first reflection surfaces 120; or the light enters the main optical axis and the two second reflecting surfaces, and the total reflection is finished on the second reflecting surfaces; or enters the incident main optical axis, the two first reflecting surfaces 120 and the two second reflecting surfaces and then exits through the exit surface, and the light beam is divided into a plurality of parts, each part forming a superimposed light spot in the far field. Besides the main optical axis, the light beam forms a linear light spot superposition in the far field only after being reflected by the first reflecting surface 120 or the second reflecting surface, and the light beam is simultaneously reflected by the first reflecting surface 120 and the second reflecting surface to form a surface light spot superposition in the far field. Only one optical element 12 is arranged, the optical element 12 is provided with a first reflecting surface 120 and a second reflecting surface, so that a light beam entering the optical element 12 is divided into a plurality of parts, the light beam is cut and rearranged, the distribution characteristic of the light beam is changed, the light beam is homogenized, light spot superposition can be realized, the light source has no limitation requirement, light spot change can be carried out according to different light sources, and the optical element 12 is small in size, compact in structure and low in cost; moreover, the light spot has diversified forms and high flexibility, and can adapt to different requirements.

Specifically, the first and second

reflective surfaces

120 and 120 include curved surfaces. That is, the first reflecting surface 120 and the second reflecting surface may be composed of a plane surface close to the incident surface and an arc surface close to the exit surface, and the plane surface and the arc surface are connected.

Illustratively, as shown in fig. 1, the first reflective surface 120 is a full arc surface, in fig. 3, the first reflective surface 120 is formed by connecting a plane and an arc surface, and the microstructure 121 is disposed on the arc surface.

The arc surface enables the light beams emitted by the two first reflecting surfaces 120 or the two second reflecting surfaces and the light beams emitted by the main optical axis to form a certain included angle, or overlap or not, so that strong light spots in an angle space, angle space flat-top light spots or angle space segmented light spots are formed.

Wherein, the cambered surface comprises any one of a paraboloid, a hyperboloid and an aspheric surface.

Further, the arc surface may be a single arc surface, and the arc surface may also be an arc surface formed by a plurality of sub-arc surfaces 122. The arc surface includes a plurality of sub-arc surfaces 122 connected in sequence, and the arc directions of adjacent sub-arc surfaces 122 are different. The sub-arc surface 122 is a high-order ellipsoidal aspheric surface.

The incident surface may be a plane or a conical surface, and includes a first incident surface 123 and a second incident surface 124 that are connected to each other and symmetrically disposed along the main optical axis. The conical surface can be convex to the light source direction and can also be convex to the far field direction.

A third incident surface 125 is connected between the first incident surface 123 and the second incident surface 124, and divides the incident surface into three surfaces. In the main optical axis direction, the central axis of the third incident surface 125 coincides with the main optical axis, and the third incident surface 125 may be a plane.

A plurality of microstructures 121 connected in sequence are respectively arranged on the arc surface, the sub-arc surface 122 and the third incident surface 125, and the arrangement directions of the adjacent microstructures 121 are the same. Microstructure 121 accomplishes the homogenization or fine-tuning of the reflected beam.

The microstructure 121 includes any one of a concave surface, a convex surface, a serrated surface, and a bidirectional free-form surface. The arrangement directions of adjacent microstructures 121 are the same, for example, when the microstructures 121 are convex surfaces, a plurality of convex surfaces connected in sequence all protrude in the same direction.

In fig. 3, microstructures 121 are disposed on both the arc surface and the third incident surface 125, the microstructures 121 are convex surfaces, the convex surface on the first reflecting surface 120 is convex in a direction away from the main optical axis, and the convex surface on the third incident surface 125 is convex toward the light source.

In summary, in the optical element 12 provided in the embodiment of the present disclosure, after the light beam enters the optical element 12, the light beam is cut into several parts, one part of the light beam enters the first reflective surface 120 and/or the second reflective surface, and another part of the light beam enters the central cavity (via the main optical axis) formed by the reflective surfaces, and the light beams of the parts are superimposed in the far field to form a superimposed light spot. The optical element 12 is capable of cutting and rearranging a light beam, changing the beam distribution characteristics, and homogenizing the light beam. The first reflecting surface 120 and the second reflecting surface have various surface types to diversify the form of the light spot. The optical element 12 has low cost, small size and compact structure; the flexibility is high, and the device can adapt to different requirements; the light spot forms are diversified, and the like.

The following takes the incident of the light beam on the first reflecting surface 120 as an example, and some examples are listed to specifically describe the present embodiment:

example one

As shown in fig. 1, the optical element includes a semiconductor laser light source, a compression mirror 11 or a beam expander, and an optical element 12 (optical waveguide) having a concave arc-shaped first reflecting surface 120, and the exit end is a small end (the two first reflecting surfaces 120 are reverse paraboloids or hyperboloids, and the surface shape is corrected to be an aspherical surface by a high-order coefficient).

The semiconductor laser emits a laser beam, the laser beam is emitted into the side arc-shaped optical waveguide through the slow axis compression mirror 11 (only the size of a light spot is compressed), the middle light beam is directly emitted to a far field through the optical waveguide (through the main optical axis), and the light beams at two sides are emitted after being totally reflected or reflected by the arc surface of the first reflection surface 120 to form light spot energy distribution shown in fig. 2. The cambered surface is a high-order term aspheric surface of a reverse paraboloid or a hyperboloid or both basic surface types. The outgoing light beams at the two sides form a certain included angle with the light beam at the middle part, or are overlapped or not overlapped. Strong light spots in angular space, angular space flat-top light spots and angular space segmented light spots are formed. The first reflecting surface 120 has a micro-structure 121 shown in fig. 3 on the arc, and the micro-structure 121 performs homogenization or fine-dividing direction adjustment on the reflected light beam to form the light spot energy distribution shown in fig. 4. The microstructure 121 includes a concave surface, a convex surface, a serrated surface, a bidirectional free-form surface, and the like.

Example two

The difference between the present embodiment and the first embodiment is that the first reflecting surface 120 is a convex arc shape as shown in fig. 5, the surface shape of the first reflecting surface 120 is a forward parabolic or hyperbolic surface, and the surface shape is modified into an aspheric surface by high-order coefficients, so as to form the spot energy distribution as shown in fig. 6. The first reflecting surface 120 has a microstructure 121 shown in fig. 7 on an arc shape, and the microstructure 121 is a concave surface concave to the main optical axis, so as to form the spot energy distribution shown in fig. 8.

EXAMPLE III

The difference between this embodiment and the first embodiment is that the first reflecting surface 120 is a convex arc shape as shown in fig. 9, the outlet end is a large end, the surface shape of the first reflecting surface 120 is an inverse paraboloid or hyperboloid, and the surface shape is modified into an aspheric surface by high order coefficients, so as to form the spot energy distribution as shown in fig. 10. The first reflecting surface 120 has a microstructure 121 shown in fig. 11 on an arc shape, and the microstructure 121 is a concave surface concave to the main optical axis.

Example four

The difference between the present embodiment and the first embodiment is that the first reflecting surface 120 is a convex arc shape as shown in fig. 12, the outlet end is a large end, the surface shape of the first reflecting surface 120 is a forward paraboloid or a hyperboloid, and the surface shape is modified into an aspheric surface by high order coefficients, so as to form the spot energy density distribution as shown in fig. 13. The first reflecting surface 120 has a convex arc shape with microstructures 121 as shown in fig. 14, and the microstructures 121 protrude in a direction away from the main optical axis to form the spot energy distribution as shown in fig. 14.

EXAMPLE five

In this embodiment, different from the first embodiment, the first reflective surface 120 is a convex arc shape as shown in fig. 15, the outlet end is a small end, and the two sides are high-order ellipsoid aspheric surfaces, so as to form the spot energy distribution as shown in fig. 16.

Alternatively, the first reflecting surface 120 has a convex arc shape as shown in fig. 17, the exit end is a large end, and both sides are high-order ellipsoidal aspheric surfaces, thereby forming the spot energy distribution shown in fig. 18.

EXAMPLE six

The difference between this embodiment and the first embodiment is that, as shown in fig. 19, the optical waveguide is prism-shaped at the front end (incident surface), the first reflecting surface 120 is concave arc-shaped, the exit end is a large end, and the first reflecting surface 120 is a high-order ellipsoid aspheric surface.

The semiconductor laser emits laser beams, the laser beams enter the front end edge-shaped and first reflecting surface 120 concave arc-shaped optical waveguide, are refracted inwards or outwards through the front end edge surface of the optical waveguide, then enter the optical waveguide, are reflected or totally reflected on the concave arc-shaped surface of the first reflecting surface 120 and then are emitted, and overlapped medium-intensity light spots are formed in a far field.

The cambered surface is a 120-surface type first reflecting surface which is a high-order ellipsoid aspheric surface. The outgoing light beams at the two sides form a certain included angle with the light beam at the middle part, or are overlapped or not overlapped. Forming a strong spot in angular space, an angular space flat-topped spot, or an angular space segmented spot. As shown in fig. 20, the first reflective surface 120 is provided with a convex microstructure 121.

As shown in fig. 21, the incident surface further includes a third incident surface 125, and in fig. 22, the microstructure 121 is disposed on the third incident surface 125.

In fig. 23, the first incident surface 123 and the second incident surface 124 form a conical surface protruding toward the far field, and the first reflecting surface 120 is provided with the microstructure 121 shown in fig. 24.

When the light source is incident on the main optical axis, the first reflecting surface 120 and the second reflecting surface, the superposition of surface light spots is formed, the energy distribution of the light spots is the same as that of the embodiment, and the details are not repeated here.

The embodiment of the present application further provides an optical module, which includes a compression mirror 11 and the optical element 12, where the compression mirror 11 is disposed between the light source and the optical element 12. The optical module further comprises a laser light source.

The optical module can be applied to the fields of medical cosmetology, laser radar, industrial processing and the like.

The optical module includes the same structure and advantageous effects as the optical element 12 in the foregoing embodiment. The structure and advantages of the optical element 12 have been described in detail in the foregoing embodiments, and are not described in detail herein.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical element is characterized in that the optical element is provided with an incident surface, an emergent surface, two first reflecting surfaces and two second reflecting surfaces, the two first reflecting surfaces are symmetrically arranged along a main optical axis of the optical element in a fast axis direction, the two second reflecting surfaces are symmetrically arranged along the main optical axis of the optical element in a slow axis direction, and light beams emitted by a light source are respectively incident on the main optical axis through the incident surface and the two first reflecting surfaces and/or the two second reflecting surfaces and then are emitted through the emergent surface to form a superposed light spot.

2. An optical element as recited in claim 1, wherein said first and second reflective surfaces comprise curved surfaces, said curved surfaces being proximate said exit surface.

3. The optical element of claim 2, wherein the curved surface comprises any one of a paraboloid, a hyperboloid, and an aspheric surface.

4. The optical element according to claim 2, wherein the arc surface comprises a plurality of sub-arc surfaces connected in sequence, and the arc directions of the adjacent sub-arc surfaces are different.

5. The optical element of claim 4, wherein the subsurface is a higher order ellipsoidal aspheric surface.

6. An optical element according to claim 4, wherein the entrance face comprises a first entrance face and a second entrance face connected to each other and symmetrically arranged along the main optical axis.

7. The optical element according to claim 6, wherein a third incident surface is further connected between the first incident surface and the second incident surface.

8. The optical element according to claim 7, wherein the arc surface, the sub-arc surface and the third incident surface are respectively provided with a plurality of microstructures sequentially connected to adjust the direction of the incident light beam.

9. The optical element of claim 8, the microstructures comprising any one of a concave surface, a convex surface, a serrated surface, and a bidirectional free-form surface.

10. An optical component in accordance with claim 1, wherein the optical component is an optical waveguide.

11. An optical module comprising a compression mirror and an optical element according to any one of claims 1 to 10, the compression mirror being disposed between a light source and the optical element.

12. The optical module of claim 11 further comprising a laser light source.