CN115857181B - 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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- CN115857181B CN115857181B CN202211283645.1A CN202211283645A CN115857181B CN 115857181 B CN115857181 B CN 115857181B CN 202211283645 A CN202211283645 A CN 202211283645A CN 115857181 B CN115857181 B CN 115857181B
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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, an annular beam conversion device arranged at the tail end of the high-power laser source and having a stray light treatment function, a wedge-shaped axicon group arranged in the annular beam conversion device, and a stray light cut-off device arranged in the annular beam conversion device. Through the wedge-shaped axicon group that has the same wedge angle to make the whole slope setting of relative laser source light beam exit direction of wedge-shaped axicon group, avoid the stray light that wedge-shaped axicon group specular reflection produced to get into the laser source system, simultaneously, utilize stray light stop device and stray light absorbing device to intercept and absorb the stray light that above-mentioned process produced, effectively realized the control to the inside stray light of annular beam conversion device system when guaranteeing that output beam is the accurate annular light beam, can hinder the specular reflection stray light to get into high-power laser source system and cause the inside device of laser source system to damage.
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, the annular light beam has certain application requirements in the fields of industrial manufacturing, national security and other high-power lasers. Along with the increasing requirement of the output power of a laser system, when a conventional coaxial transmission lens group annular beam shaping device is used for converting a solid beam into an annular beam, stray light generated by the reflection effect of a transmission lens surface is difficult to control, and part of strong stray light can enter the high-power laser source to cause the damage of internal devices of the high-power laser source and the like.
In view of the foregoing, there is a need for an improved high power solid beam and annular beam conversion device that solves the above-mentioned 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 conversion device, including a high-power laser source, an annular beam conversion device with stray light processing function disposed at the end of the high-power laser source;
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 and the light beam emergent direction of the high-power laser source are obliquely arranged.
Preferably, the wedge-shaped negative axicon and the wedge-shaped positive axicon are coaxially arranged, 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, a side, far away from the high-power laser source, of the wedge-shaped negative axicon is a first right end face, and the first right end face is a concave conical surface.
Preferably, the wedge-shaped positive axicon is close to the wedge-shaped negative axicon and is a second left end face, the wedge-shaped positive axicon is far away from the wedge-shaped negative axicon and is a second right end face, the second left end face is a convex conical face with the same cone base angle size as the first right end face, and the second right end face is a plane with the same wedge angle size as the first left end face.
Preferably, the first stray light blocking device is arranged at the rear side of the wedge-shaped negative axicon; the second stray light cut-off device is arranged at the inner wall of the light inlet of the annular light beam conversion device.
Preferably, the inner wall of the annular light beam conversion device forms a stray light absorbing device, the stray light absorbing device is a stray light eliminating thread coated with stray light eliminating paint, and the caliber of the wedge-shaped positive axicon is larger than that of the wedge-shaped negative axicon.
The invention further provides a using method of the high-power solid beam and annular beam conversion device, which comprises the following specific 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 blocking ratio under the action of the wedge-shaped negative axicon, and then the annular beam is converted into a collimated annular beam with a certain blocking ratio k and a constant beam emitting direction by utilizing the wedge-shaped positive axicon.
Preferably, the magnitude of the blocking ratio k is calculated from 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 blocking ratio k is as follows:
where n is the refractive index of the wedge axicon material and d is the aperture of the incident beam.
Preferably, the specific calculation method of the inclination angle θ of the axicon lens group relative to the beam emitting direction of the laser source is as follows:
sin (θ+β) =n sin β, where β is the axicon wedge angle.
The beneficial effects of the invention are as follows:
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 with a stray light treatment function, wherein the annular beam conversion device is arranged at the tail end of the high-power laser source, and a wedge axicon group consisting of a wedge negative axicon and a wedge positive axicon is arranged in the annular beam conversion device; by designing the wedge-shaped negative axicon and the wedge-shaped positive axicon, the wedge angles of the wedge-shaped negative axicon and the wedge-shaped positive axicon are the same, and the whole wedge-shaped axicon has a certain angle inclination relative to the beam emergent direction of the laser source, so that the collimated laser beam emitted by the high-power laser source can be converted into the collimated annular beam with a certain blocking ratio k by using the wedge-shaped negative axicon and the wedge-shaped positive axicon, and specular reflection stray light cannot return to the laser source system along the beam incident direction; the blocking ratio of the collimated annular 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 property of the beam is realized; by arranging the first stray light cut-off device, the second stray light cut-off device and the stray light absorption device at corresponding positions in the annular light beam conversion device, stray light generated by specular 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 a quasi-straight annular light beam, and the damage of internal devices of the laser source system caused by the fact that the specular reflection stray light enters the high-power laser source system is avoided.
Drawings
FIG. 1 is a schematic diagram of a high-power solid beam and annular beam conversion device according to the present invention;
FIG. 2 is a beam simulation diagram obtained when the high-power solid beam and annular beam transforming device of the present invention is applied in example 1;
the reference numerals are as follows:
1. a high power laser source; 2. wedge-shaped negative axicon; 3. wedge-shaped positive axicon; 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 due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further 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 invention 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 with stray light treatment function, wherein the annular beam conversion device is arranged at the tail end of the high-power laser source 1, a wedge-shaped axicon group consisting of a wedge-shaped negative axicon 2 and a wedge-shaped positive axicon 3 is arranged 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 arranged, and the wedge-shaped axicon group and the beam emergent direction from the high-power laser source 1 are inclined at a certain angle; a plurality of stray light cut-off devices are arranged at specific positions in the annular light beam conversion device, the stray light cut-off devices comprise a first stray light cut-off device 4 arranged at the rear side of the wedge-shaped negative axicon 2, a second stray light cut-off device 5 arranged at the inner wall of a light inlet of the annular light beam conversion device, the first stray light cut-off device 4 and the second stray light cut-off device 5 are annular light barrier, and those skilled in the art understand that in other embodiments, the position of the first stray light cut-off device 4 can be adjusted according to the need, and the invention is not limited thereto; further, the inner wall of the annular light beam conversion device forms a stray light absorbing device 6, and the stray light absorbing device 6 is a stray light eliminating thread coated with stray light eliminating paint, so that the stray light can be effectively cut off by the first stray light cut-off device 4 and the second stray light cut-off device 5, and the residual stray light is absorbed by the stray light absorbing device 6, so that the stray light generated by specular reflection is effectively prevented from entering the high-power laser source 1 to damage internal devices of the laser source system.
Specifically, the caliber of the wedge positive axicon 3 is larger than that of the wedge negative axicon 2, the first left end face of the wedge negative axicon 2 is close to the high-power laser source 1, the first left end face is a plane with a certain wedge angle beta 1, the wedge positive axicon 3 is close to the wedge negative axicon 2 and is a second left end face, the second left end face is a convex conical surface, the cone base angle alpha 2 of the second left end face is equal to alpha 1 in size, the wedge positive axicon 3 is far away from the wedge negative axicon 2 and is a second right end face, the second right end face is a plane with a certain wedge angle, the wedge angles beta 2 and beta 1 of the second right end face are equal in size, under the conditions, the collimated laser beam emitted by the high-power laser source 1 can be converted into an annular beam with a certain blocking ratio and continuously variable in size by the wedge negative axicon 2, and then the annular beam is converted into the collimated annular beam with a certain blocking ratio k and a constant beam emitting direction by the wedge positive axicon 3.
Further, the size of the blocking ratio k is determined by the distance L between the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3, the cone base angle alpha of the wedge-shaped axicon and the refractive index n of the wedge-shaped axicon optical material, 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 value of L can be adjusted through a mechanical structure, and the relation between the size k of the emergent annular light beam blocking ratio and the distance L between the positive axicon and the negative axicon and the cone base angle alpha of the wedge-shaped axicon satisfy the following relation:
wherein n is the refractive index of the wedge-shaped axicon material, and d is the caliber of the incident beam; furthermore, the relationship between the wedge angle beta of the wedge-shaped axicon and the inclination angle theta of the axicon lens group relative to the outgoing direction of the laser source beam 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 relation should be satisfied:
s is the distance from the left end face of the wedge-shaped negative axicon to the second stray light interception device.
When the wedge angle beta and the cone base angle alpha of the wedge-shaped axicon meet the above conditions, the emergent beam can be a collimated annular beam with a certain blocking ratio, and the stray light reflected by the transmission surfaces of the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 is absorbed and intercepted by the first stray light cut-off device 4, the second stray light cut-off device 5 and the stray light absorption device 6.
The invention is further illustrated by the following 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 treatment function, wherein a wedge-shaped negative axicon 2 and a wedge-shaped positive axicon 3 are arranged in the annular beam conversion device, and a wedge-shaped axicon group forms an included angle with 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 is a concave conical surface, a second left end face is close to the wedge-shaped negative axicon 2 on the wedge-shaped positive axicon 3, the second left end face is a convex conical surface with the same cone base angle as the first right end face, a second right end face is far away from the wedge-shaped negative axicon 2 on the wedge-shaped positive axicon 3, the second right end face is a plane with the same wedge angle as the first left end face, and the cone base angle alpha=7 degrees, and the wedge angle beta=8 degrees; specifically, the rear end of the wedge-shaped negative axicon 2 is provided with a first stray light cut-off device 4, the inner wall of the light inlet of the annular light beam conversion device is provided with a second stray light cut-off device 5, the inner wall of the annular light beam conversion device forms a stray light absorption device 6, and the stray light absorption device 6 is a stray light eliminating thread coated with stray light eliminating paint.
When the high-power solid beam and annular beam conversion device is used for converting the beam, 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 blocking ratio under the action of the wedge-shaped negative axicon 2, and then the annular beam is converted into a collimated annular beam with a certain blocking ratio k and a constant beam emitting direction by utilizing the wedge-shaped positive axicon 3;
the size of the blocking ratio k is determined by the distance L between the cone angle vertexes of the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3 and the cone base angle alpha of the wedge-shaped axicon, the distance L=344 mm between the wedge-shaped negative axicon 2 and the wedge-shaped positive axicon 3, and the relation between the size k of the emergent annular light beam blocking ratio k, the distance L between the positive axicon and the negative axicon and the cone base angle alpha of the wedge-shaped axicon meets the following relation:
wherein n is the refractive index of the wedge-shaped axicon material, d is the caliber of the incident beam, n=1.45, d=75 mm;
furthermore, the relation between the wedge angle beta of the axicon and the inclination angle theta of the axicon mirror group relative to the outgoing direction of the laser source beam satisfies the following relation:
sin(θ+β)＝n sinβ
the specific values of L, n, d, α, β are taken into the above formula to calculate the mask ratio k=0.33.
In summary, the high-power solid beam and annular beam conversion device provided by the invention comprises a high-power laser source, an annular beam conversion device with a stray light processing function, which is arranged at the tail end of the high-power laser source, wherein the annular beam conversion device is internally provided with a wedge-shaped axicon group consisting of a wedge-shaped negative axicon and a wedge-shaped positive axicon, and a stray light stopping device which is arranged in the annular beam conversion device. Through the wedge-shaped axicon group that has the same wedge angle to make the whole slope setting of relative laser source light beam exit direction of wedge-shaped axicon group, avoid the stray light that specular reflection produced to get into front end laser source system when guaranteeing that output beam is collimation annular light beam, simultaneously, utilize stray light absorbing device and stray light stop device to intercept and absorb the stray light that above-mentioned process produced, effectively realized the control of the interior stray light of annular light beam conversion device system when outputting collimation annular light beam, hinder the specular reflection stray light to get into high-power laser source system and cause laser source system internal device damage. The high-power solid beam and annular beam conversion device provided by the invention has the advantages of simple structure, strong practicability and simplicity in operation, and has extremely high use value in the field of high-power lasers.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (1)
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 treatment 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 and the light beam emergent direction of the high-power laser source are obliquely arranged; the wedge-shaped negative axicon and the wedge-shaped positive axicon are coaxially arranged, one side, close to the high-power laser source, of the wedge-shaped negative axicon is a first left end face, and the first left end face is a plane with a certain wedge angle; 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;
the wedge-shaped positive axicon is close to the wedge-shaped negative axicon and is a second left end face, the wedge-shaped positive axicon is far away from the wedge-shaped negative axicon and is a second right end face, the second left end face is a convex conical face with the same cone base angle as the first right end face, and the second right end face is a plane with the same wedge angle as the first left end face;
the first stray light cut-off device is arranged at the rear side of the wedge-shaped negative axicon; the second stray light cut-off device is arranged at the inner wall of the light inlet of the annular light beam conversion device; the inner wall of the annular light beam conversion device forms a stray light absorbing device, the stray light absorbing device is a stray light eliminating thread coated with stray light eliminating paint, and the caliber of the wedge-shaped positive axicon is larger than that of the wedge-shaped negative axicon;
the using method of the high-power solid beam and annular beam conversion device is as follows: 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 blocking ratio under the action of the wedge-shaped negative axicon, and then the annular beam is converted into a collimated annular beam with a certain blocking ratio k and a constant beam emitting direction by utilizing the wedge-shaped positive axicon;
the size of the blocking ratio k is calculated by the distance L between the wedge-shaped negative axicon and the wedge-shaped positive axicon, the cone base angle alpha of the wedge-shaped axicon and the refractive index n of the wedge-shaped axicon optical material;
the specific calculation method of the blocking ratio k is as follows:
wherein n is the refractive index of the wedge-shaped axicon material, and d is the caliber of the incident beam;
the specific calculation method of the inclination angle theta of the axicon lens group relative to the outgoing direction of the laser source beam is as follows:
sin (θ+β) =nsinβ, where β is the axicon wedge angle.
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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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