CN115857181A - High-power solid beam and annular beam conversion device - Google Patents
High-power solid beam and annular beam conversion device Download PDFInfo
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- CN115857181A CN115857181A CN202211283645.1A CN202211283645A CN115857181A CN 115857181 A CN115857181 A CN 115857181A CN 202211283645 A CN202211283645 A CN 202211283645A CN 115857181 A CN115857181 A CN 115857181A
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Abstract
The invention provides a high-power solid beam and annular beam conversion device which comprises a high-power laser source and an annular beam conversion device which is arranged at the tail end of the high-power laser source and has a stray light processing function, wherein a wedge-shaped axicon lens group and a stray light stopping device are arranged in the annular beam conversion device. The wedge-shaped axicon lens group with the same wedge angle is designed, and the wedge-shaped axicon lens group is arranged in an inclined mode relative to the emergent direction of the laser source light beam, so that stray light generated by mirror reflection of the wedge-shaped axicon lens group is prevented from entering a laser source system, meanwhile, the stray light generated in the process is intercepted and absorbed by the stray light stopping device and the stray light absorbing device, the control on the stray light inside the annular light beam conversion device system is effectively realized while the output light beam is guaranteed to be the collimated annular light beam, and the mirror reflection stray light can be prevented from entering the high-power laser source system to cause damage to devices inside the laser source system.
Description
Technical Field
The invention relates to the technical field of laser beam shaping, in particular to a high-power solid beam and annular beam conversion device.
Background
In recent years, annular beams have certain application requirements in the high-power laser fields of industrial manufacturing, national defense safety and the like. With the increasing requirement of the output power of the laser system, when the conventional coaxial transmission mirror group annular beam shaping device is used for converting the solid beam into the annular beam, stray light generated by the reflection action of the transmission mirror surface is difficult to control, and part of strong stray light can enter the high-power laser source, so that the damage of devices in the high-power laser source is caused, and the like.
Accordingly, there is a need for an improved high power solid beam and annular beam conversion device to solve the above problems.
Disclosure of Invention
The invention aims to provide a high-power solid beam and annular beam conversion device.
In order to achieve the above object, the present invention provides a high power solid beam and annular beam converter, which includes a high power laser source, an annular beam converter disposed at the end of the high power laser source and having a stray light processing function;
the inner cavity of the annular light beam conversion device is provided with a wedge-shaped axicon lens group consisting of a wedge-shaped negative axicon and a wedge-shaped positive axicon and a plurality of stray light cut-off devices; the wedge-shaped axicon lens group is obliquely arranged with the light beam emergent direction of the high-power laser source.
Preferably, the wedge-shaped negative axicon is coaxially arranged with the wedge-shaped positive axicon, one side of the wedge-shaped negative axicon, which is close to the high-power laser source, is a first left end face, and the first left end face is a plane with a certain wedge angle.
Preferably, one side of the wedge-shaped negative axicon, which is far away from the high-power laser source, is a first right end face, and the first right end face is a concave conical surface.
Preferably, a second left end face is arranged on the wedge-shaped positive axicon and close to the wedge-shaped negative axicon, a second right end face is arranged on the wedge-shaped positive axicon and far away from the wedge-shaped negative axicon, the second left end face is a convex conical surface with the same size as the conical bottom angle of the first right end face, and the second right end face is a plane with the same size as the wedge angle of the first left end face.
Preferably, the first stray light cut-off device is arranged at the rear side of the wedge-shaped negative axicon; the second stray light stopping device is arranged on the inner wall of the light inlet of the annular light beam conversion device.
Preferably, a stray light absorbing device is formed on the inner wall of the annular light beam transformation device, the stray light absorbing device is an anti-stray light thread coated with anti-stray light paint, and the caliber of the wedge-shaped positive axicon is larger than that of the wedge-shaped negative axicon.
Furthermore, the invention also provides a use method of the high-power solid light beam and annular light beam conversion device, which comprises the following specific steps: the collimated laser beams emitted from the high-power laser source enter the annular beam conversion device, then the collimated laser beams are converted into annular beams with continuously-increased obscuration ratios under the action of the wedge-shaped negative axicon, and then the wedge-shaped positive axicon is used for converting the annular beams into collimated annular beams with a certain obscuration ratio k and unchanged beam emergent directions.
Preferably, the magnitude of the obscuration ratio k is calculated by the distance L between the wedge-shaped negative axicon and the wedge-shaped positive axicon, the cone base angle α of the wedge-shaped axicon, and the refractive index n of the wedge-shaped axicon optical material.
Preferably, the specific calculation method of the obscuration ratio k is as follows:
Preferably, the specific calculation method of the inclination angle θ of the axicon lens group relative to the emergent direction of the laser light beam is as follows:
sin (theta + beta) = n sin beta, wherein beta is an axicon wedge angle.
The invention has the beneficial effects that:
the invention provides a high-power solid beam and annular beam conversion device, which comprises a high-power laser source and an annular beam conversion device which is arranged at the tail end of the high-power laser source and has a stray light processing function, wherein a wedge-shaped axicon lens group consisting of a wedge-shaped negative axicon and a wedge-shaped positive axicon is arranged inside the annular beam conversion device; the wedge-shaped negative axicon and the wedge-shaped positive axicon are designed to have the same wedge angle of the wedge-shaped axicon plane, and the wedge-shaped axicon lens group integrally inclines at a certain angle relative to the emergent direction of the laser beam of the laser source, so that the collimated laser beam emitted by the high-power laser source can be converted into a collimated annular beam with a certain obscuration ratio k by using the wedge-shaped negative axicon and the wedge-shaped positive axicon, and the mirror reflection stray light cannot return to the laser source system along the incident direction of the beam; the blocking ratio of the collimated annular light beam can be adjusted by adjusting the distance between the wedge-shaped negative axicon and the wedge-shaped positive axicon, so that the purpose of adjusting the properties of the light beam is realized; the first stray light stopping device, the second stray light stopping device and the stray light absorbing device are arranged at corresponding positions in the annular light beam conversion device, so that stray light generated by mirror reflection of the wedge-shaped negative axicon and the wedge-shaped positive axicon can be absorbed and intercepted, the control of the stray light in the annular light beam conversion device system is effectively realized while the output light beam is ensured to be a collimated annular light beam, and the damage of devices in the laser source system caused by the fact that the mirror reflection stray light enters the high-power laser source system is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a high power solid beam and annular beam conversion device according to the present invention;
fig. 2 is a light beam simulation diagram obtained when the high-power solid light beam and annular light beam conversion device of the present invention is applied in embodiment 1;
the reference numbers are as follows:
1. a high power laser source; 2. a wedge-shaped negative axicon; 3. a wedge-shaped right-axis pyramid; 4. a first stray light cut-off device; 5. a second stray light cut-off device; 6. stray light absorbing means.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that 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.
Referring to fig. 1, the present invention provides a high power solid beam and annular beam conversion device, including a high power laser source 1, an annular beam conversion device with a stray light processing function disposed at the end of the high power laser source 1, wherein a wedge-shaped axicon lens group composed of a wedge-shaped negative axicon 2 and a wedge-shaped positive axicon 3 is disposed in an inner cavity of the annular beam conversion device, the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 are coaxially disposed, and the wedge-shaped axicon lens group is inclined at a certain angle with the exit direction of a beam from the high power laser source 1; a plurality of stray light cut-off devices are arranged at specific positions in the annular light beam conversion device, each stray light cut-off device comprises a first stray light cut-off device 4 arranged at the rear side of the wedge-shaped negative axicon 2 and a second stray light cut-off device 5 arranged at the inner wall of the light inlet of the annular light beam conversion device, and the first stray light cut-off device 4 and the second stray light cut-off device 5 are both annular light baffles; furthermore, a stray light absorption device 6 is formed on the inner wall of the annular light beam conversion device, the stray light absorption device 6 is a stray light eliminating thread coated with stray light eliminating paint, and therefore the first stray light stopping device 4 and the second stray light stopping device 5 can be used for effectively stopping stray light, the stray light absorption device 6 is used for absorbing residual stray light, and the situation that stray light generated by mirror reflection enters the high-power laser source 1 to cause damage to devices in the laser source system is effectively avoided.
Specifically, the aperture of the wedge-shaped positive axicon 3 is larger than the aperture of the wedge-shaped negative axicon 2, the first left end surface of the wedge-shaped negative axicon 2 is close to the high-power laser source 1, the first left end surface is a plane with a certain wedge angle β 1, the wedge-shaped positive axicon 3 close to the wedge-shaped negative axicon 2 is a second left end surface, the second left end surface is a convex conical surface, the cone base angle α 2 of the second left end surface is equal to the size of α 1, the wedge-shaped positive axicon 3 away from the wedge-shaped negative axicon 2 is a second right end surface, the second right end surface is a plane with a certain wedge angle, the wedge angle β 2 of the second right end surface is equal to the size of β 1, under the above conditions, the wedge-shaped negative axicon 2 can be used for converting the collimated laser beam emitted from the high-power laser source 1 into an annular beam with a continuously-increased blocking ratio, and then, the wedge-shaped positive axicon 3 can be used for converting the annular beam into an annular beam with a certain blocking ratio k and the collimation direction of the beam is unchanged.
Further, the size of the obscuration ratio k is determined by the distance L between the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3, the cone bottom angle α of the wedge-shaped axicon, and the refractive index n of the optical material of the wedge-shaped axicon, wherein the distance L between the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 is the length of the connecting line of the cone angle vertexes of the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3, the numerical value of L can be adjusted through a mechanical structure, and the relationship between the size k of the annular emergent beam obscuration ratio, the distance L between the positive axicon and the negative axicon, and the cone bottom angle α of the wedge-shaped axicon satisfies the following relational expression:
wherein n is the refractive index of the wedge-shaped axicon material, and d is the aperture of an incident beam; furthermore, the relationship between the wedge angle β of the wedge-shaped axicon and the inclination angle θ of the axicon lens group relative to the emergent direction of the laser beam of the laser source satisfies the following relationship:
sin(θ+β)＝n sinβ
in addition, in order to ensure that the stray light reflected by the wedge-shaped axicon lens group is intercepted or absorbed by a stray light cut-off device and a stray light absorption device in the system, the following relational expression is satisfied:
and S is the distance from the left end surface of the wedge-shaped negative axicon to the second stray light intercepting device.
When the wedge angle beta and the cone bottom angle alpha of the wedge-shaped axicon meet the conditions, the emergent light beam can be a collimated annular light beam with a certain blocking ratio, and the transmission surfaces of the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 reflect stray light to be absorbed and intercepted by the first stray light blocking device 4, the second stray light blocking device 5 and the stray light absorbing device 6.
The invention is further illustrated by the following specific examples:
example 1
The embodiment provides a high-power solid beam and annular beam conversion device, which comprises a high-power laser source 1 and an annular beam conversion device which is arranged at the tail end of the high-power laser source 1 and has a stray light processing function, wherein a wedge-shaped negative axicon 2 and a wedge-shaped positive axicon 3 are arranged inside the annular beam conversion device, and an included angle is formed between a wedge-shaped axicon group and the incident beam direction of the high-power laser source; specifically, a first left end face of the wedge-shaped negative axicon 2 is a plane with a certain wedge angle, a first right end face of the wedge-shaped negative axicon 2 is a concave conical surface, a second left end face of the wedge-shaped positive axicon 3, which is close to the wedge-shaped negative axicon 2, is a convex conical surface with the same size as the cone bottom angle of the first right end face, a second right end face of the wedge-shaped positive axicon 3, which is far away from the wedge-shaped negative axicon 2, is a plane with the same size as the wedge angle of the first left end face, the cone bottom angle α =7 °, and the wedge angle β =8 °; particularly, a first stray light cut-off device 4 is arranged at the rear end of the wedge-shaped negative axicon 2, a second stray light cut-off device 5 is arranged on the inner wall of a light inlet of the annular light beam conversion device, a stray light absorption device 6 is formed on the inner wall of the annular light beam conversion device, and the stray light absorption device 6 is an anti-stray light thread coated with anti-stray light paint.
When the high-power solid light beam and annular light beam conversion device is used for converting light beams, the following steps are carried out: the collimated laser beam emitted from the high-power laser source 1 enters an annular beam conversion device, then the collimated laser beam is converted into an annular beam with a continuously increased obscuration ratio under the action of a wedge-shaped negative axicon 2, and then the annular beam is converted into a collimated annular beam with a certain obscuration ratio k and a constant beam emergent direction by utilizing a wedge-shaped positive axicon 3;
the size of the obscuration ratio k is determined by the distance L between the cone angles of the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 and the cone bottom angle alpha of the wedge-shaped axicon, the distance L =344mm between the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3, and the relationship between the size of the obscuration ratio k of the emergent annular light beam and the distance L between the positive axicon and the negative axicon and the cone bottom angle alpha of the wedge-shaped axicon meets the following relational expression:
wherein n is the refractive index of the wedge-shaped axicon material, d is the caliber of an incident light beam, n =1.45, d =75mm;
furthermore, the relationship between the axicon wedge angle β and the inclination angle θ of the axicon lens group relative to the emergent direction of the laser light beam satisfies the following relationship:
sin(θ+β)＝n sinβ
the specific values of L, n, d, α, β are substituted into the obscuration ratio k =0.33 calculated by the above formula.
In summary, the high-power solid beam and annular beam conversion device provided by the invention comprises a high-power laser source and an annular beam conversion device which is arranged at the tail end of the high-power laser source and has a stray light processing function, wherein a wedge-shaped axicon lens group consisting of a wedge-shaped negative axicon and a wedge-shaped positive axicon and a stray light cut-off device arranged inside the annular beam conversion device are arranged inside the annular beam conversion device. By designing the wedge-shaped axicon lens group with the same wedge angle and enabling the wedge-shaped axicon lens group to be arranged obliquely relative to the emergent direction of the laser source light beam, the output light beam is ensured to be the collimation annular light beam, meanwhile, stray light generated by mirror reflection is prevented from entering a front-end laser source system, meanwhile, the stray light generated in the process is intercepted and absorbed by the stray light absorption device and the stray light stopping device, the control of the stray light in the annular light beam conversion device system is effectively realized while the collimation annular light beam is output, and the damage of internal devices of the laser source system due to the fact that the mirror reflection stray light enters the high-power laser source system is prevented. The high-power solid beam and annular beam conversion device provided by the invention has the advantages of simple structure, strong practicability, simplicity in operation and extremely high use value in the field of high-power lasers.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. The high-power solid beam and annular beam conversion device is characterized by comprising a high-power laser source and an annular beam conversion device which is arranged at the tail end of the high-power laser source and has a stray light processing function;
the inner cavity of the annular light beam conversion device is provided with a wedge-shaped axicon lens group consisting of a wedge-shaped negative axicon and a wedge-shaped positive axicon and a plurality of stray light cut-off devices; the wedge-shaped axicon lens group is obliquely arranged with the emergent direction of the light beam of the high-power laser source.
2. The high power solid-beam and ring-beam conversion device of claim 1, wherein the negative wedge-shaped axicon is coaxially disposed with the positive wedge-shaped axicon, and a side of the negative wedge-shaped axicon close to the high power laser source is a first left end face, and the first left end face is a plane with a certain wedge angle.
3. The high power solid beam to annular beam conversion device of claim 2, wherein a side of said wedge-shaped negative axicon remote from said high power laser source is a first right end face, and said first right end face is a concave conical surface.
4. The high power solid beam to ring beam conversion device of claim 3, wherein said wedge-shaped positive axicon is a second left end surface close to said wedge-shaped negative axicon, said wedge-shaped positive axicon is a second right end surface far from said wedge-shaped negative axicon, said second left end surface is a convex conical surface with the same size of the cone base angle of said first right end surface, and said second right end surface is a plane with the same size of the wedge angle of said first left end surface.
5. The high power solid-beam and annular-beam conversion device according to claim 1, wherein the first stray light cut-off device is disposed at the rear side of the wedge-shaped negative axicon; the second stray light stopping device is arranged on the inner wall of the light inlet of the annular light beam conversion device.
6. The high power solid beam and ring beam conversion device of claim 1, wherein the inner wall of said ring beam conversion device forms a stray light absorption device, said stray light absorption device is a stray light eliminating thread coated with an eliminating light paint, and the caliber of said wedge-shaped positive axicon is larger than that of said wedge-shaped negative axicon.
7. The use method of the high-power solid beam and annular beam conversion device according to any one of claims 1 to 6, characterized by comprising the following steps: the collimated laser beam emitted from the high-power laser source enters the annular beam conversion device, then the collimated laser beam is converted into an annular beam with a continuously-increased obscuration ratio under the action of the wedge-shaped negative axicon, and then the wedge-shaped positive axicon is used for converting the annular beam into a collimated annular beam with a certain obscuration ratio k and a constant beam emergent direction.
8. The method for using the high-power solid beam and ring beam transformation device according to claim 7, wherein the magnitude of the obscuration ratio k is calculated by the distance L between the wedge-shaped negative axicon and the wedge-shaped positive axicon, the base angle α of the wedge-shaped axicon, and the refractive index n of the wedge-shaped axicon optical material.
9. The method for using the high power solid beam to annular beam conversion device according to claim 8, wherein the specific method for calculating the obscuration ratio k is as follows:
10. The use method of the device for transforming the high-power solid beam and the annular beam according to claim 9, wherein the specific method for calculating the inclination angle θ of the axicon lens group relative to the emergent direction of the laser beam is as follows:
sin (θ + β) = nsin β, where β is the axicon wedge angle.
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| CN202211283645.1A CN115857181B (en) | 2022-10-20 | 2022-10-20 | High-power solid beam and annular beam conversion device |
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| CN202211283645.1A CN115857181B (en) | 2022-10-20 | 2022-10-20 | High-power solid beam and annular beam conversion device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1647855A (en) * | 2004-01-19 | 2005-08-03 | 中国石油化工股份有限公司 | Catalyst containing MCM-22 zeolite |
| US20060146384A1 (en) * | 2003-05-13 | 2006-07-06 | Carl Zeiss Smt Ag | Optical beam transformation system and illumination system comprising an optical beam transformation system |
| CN107247297A (en) * | 2017-06-22 | 2017-10-13 | 山东航天电子技术研究所 | A kind of built-up shaft pyramid device |
| CN107589547A (en) * | 2016-07-08 | 2018-01-16 | 中国科学院大连化学物理研究所 | A kind of converting means of solid light beam and annular beam |
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- 2022-10-20 CN CN202211283645.1A patent/CN115857181B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060146384A1 (en) * | 2003-05-13 | 2006-07-06 | Carl Zeiss Smt Ag | Optical beam transformation system and illumination system comprising an optical beam transformation system |
| CN1647855A (en) * | 2004-01-19 | 2005-08-03 | 中国石油化工股份有限公司 | Catalyst containing MCM-22 zeolite |
| CN107589547A (en) * | 2016-07-08 | 2018-01-16 | 中国科学院大连化学物理研究所 | A kind of converting means of solid light beam and annular beam |
| CN107247297A (en) * | 2017-06-22 | 2017-10-13 | 山东航天电子技术研究所 | A kind of built-up shaft pyramid device |
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