CN220188814U - Bessel beam generation device and flying light path cutting system - Google Patents
Bessel beam generation device and flying light path cutting system Download PDFInfo
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Abstract
The utility model belongs to the technical field of optical systems, and particularly relates to a Bessel beam generating device and a flight light path cutting system. The Bessel light beam generating device comprises a first conical lens, a second conical lens, a 4f system and a third conical lens which are sequentially arranged, wherein conical tops of the first conical lens and the second conical lens are arranged in opposite directions; the light beam between the second conical lens and the 4f system is a collimated light beam; the light beam between the 4f system and the third conical lens is a collimated light beam; therefore, the distance between the first conical lens and the 4f system and the distance between the 4f system and the third conical lens are adjustable, so that the whole length of the Bessel beam generating device or the optical system can be conveniently adjusted according to the requirements of different application scenes; the distance between the first conical lens and the second conical lens can be adjusted according to the requirements of an application scene, or the base angle of the third conical lens is changed, so that Bessel beams with different working distances can be obtained; the Bessel light beams with different focal depths and different focal spot sizes can be obtained by selecting the first conical lenses with different base angles.
Description
Technical Field
The utility model belongs to the technical field of optical systems, and particularly relates to a Bessel beam generating device and a flight light path cutting system.
Background
In 1987, J Durnin proposed the non-diffraction characteristic of a bessel beam for the first time, and the bessel beam was called a non-diffraction beam. The beam can be unchanged along with the increase of the distance, so that the width of the light ring is kept unchanged, almost no diffraction is generated in a short distance, and the beam can be restored after passing through an obstacle and is used for scientific research, measurement, calibration, precision machining, medical treatment, especially for a microscope, optical tweezers and laser surgery of eyes. Bessel beams are also widely used in materials processing, particularly in the laser micromachining field, such as glass cutting, due to their unique longitudinal focusing properties. The traditional optical structure has the characteristics of short working distance of the Baeler beam, fixed size of the beam focus, fixed system structure and the like.
However, laser micromachining is often required to process workpieces of different thicknesses and different materials. Different processed objects and different application scenes have different requirements on the length of the system structure of the generated Bessel light beam, so that an optical system structure with adjustable system structure length for generating the Bessel light beam is required to be designed.
Disclosure of Invention
The utility model aims to provide a Bessel beam generating device with adjustable length and a flying light path cutting system.
The utility model provides a Bessel beam generating device, comprising: the first cone lens, the second cone lens, the 4f system and the third cone lens are sequentially arranged; wherein the cone tops of the first cone lens and the second cone lens are arranged in opposite directions; the light beam between the second conical lens and the 4f system is a collimated light beam; the light beam between the 4f system and the third conical lens is a collimated light beam.
In an embodiment of the present utility model, base angles of the first and second conical lenses are the same.
In one embodiment of the present utility model, the second conical lens is located after the focal point of the first conical lens.
In one embodiment of the utility model, the 4f system includes a first plano-convex lens and a second plano-convex lens.
In an embodiment of the utility model, a base angle of the first conical lens and the second conical lens is 1-10 degrees.
In an embodiment of the utility model, a base angle of the third conical lens is 1 ° to 10 °.
In yet another aspect, the present utility model further provides a system for cutting a flight path, including: the bessel beam generating apparatus as described above.
The Bessel light beam generation device has the beneficial effects that the Bessel light beam generation device comprises a first conical lens, a second conical lens, a 4f system and a third conical lens which are sequentially arranged, and conical tops of the first conical lens and the second conical lens are arranged in opposite directions; the light beam between the second conical lens and the 4f system is a collimated light beam; the light beam between the 4f system and the third conical lens is a collimated light beam; therefore, the distance between the second conical lens and the 4f system and the distance between the 4f system and the third conical lens are adjustable, so that the whole length of the Bessel beam generating device or the optical system can be conveniently adjusted according to the requirements of different application scenes; in addition, the distance between the first conical lens and the second conical lens or the base angle of the third conical lens can be adjusted according to the requirements of application scenes so as to obtain Bessel beams with different working distances; in addition, the first conical lenses with different base angles can be selected to obtain Bessel beams with different focal depths and different focal spot sizes; different types of 4f systems can be selected according to different light spot size requirements.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a bessel beam generating apparatus according to a preferred embodiment of the present utility model.
In the figure:
the laser output beam 01, the first axicon 02, the second axicon 03, the first plano-convex lens 04, the second plano-convex lens 05, the third axicon 06, the first distance 07, the second distance 08, the annular beam 09, the depth of focus 10, and the working distance 11.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. 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.
In order to meet the requirements of laser micromachining for machining objects with different thicknesses and materials and different application scenes, an embodiment of the present utility model provides a bessel beam generating device, which includes: the first cone lens, the second cone lens, the 4f system and the third cone lens are sequentially arranged; wherein the cone tops of the first cone lens and the second cone lens are arranged in opposite directions; the light beam between the second conical lens and the 4f system is a collimated light beam; the light beam between the 4f system and the third conical lens is a collimated light beam; therefore, the distance between the second conical lens and the 4f system and the distance between the 4f system and the third conical lens are adjustable, so that the whole length of the Bessel beam generating device or the optical system can be conveniently adjusted according to the requirements of different application scenes.
Referring to fig. 1, fig. 1 is a schematic view of a bessel beam generating apparatus according to a preferred embodiment of the present utility model.
In an embodiment, the bessel beam generating apparatus includes: a first axicon 02, a second axicon 03, a 4f system, and a third axicon 06 disposed in order from the object side to the image side; wherein the cone tops of the first cone lens 02 and the second cone lens 03 are arranged in opposite directions; the light beam between the second conical lens 03 and the 4f system is a collimated light beam; the beam between the 4f system and the third cone lens 06 is a collimated beam.
Specifically, the output beam 01 of the laser passes through the first conical lens 02 to generate a Bessel beam; after divergence, the light is collimated by a conical lens 03, and the collimated light spot is an annular light beam 09; the annular beam 09 is image-magnified or demagnified by a 4f system, which may include a first plano-convex lens 04 and a second plano-convex lens 05; the annular light spot after the image formation amplification or reduction by the first plano-convex lens 04 and the second plano-convex lens 05 is focused by the third cone lens 06 to form a new Bessel beam.
In this embodiment, the light beam between the second conical lens 03 and the 4f system is a collimated light beam, and the light beam between the 4f system and the third conical lens 06 is a collimated light beam, so that the first distance 07 and the second distance 08 can be adjusted according to the needs of the actual application scene, thereby adjusting the length of the whole light path, being very convenient to adjust, and being applicable to multiple application scenes.
In this embodiment, it is preferable that the base angles of the first and second microlenses 02 and 03 are the same.
Specifically, the second conical lens 03 is located behind the focal point of the first conical lens 02; the same base angle of the first and second axicon lenses 02, 03 can quite conveniently form a collimated annular beam 09; and, adjust the distance of second conical lens 03 to first conical lens 02, or change the base angle of third conical lens 06 in order to obtain the bezier light beam of different working distances 11, it is convenient to adjust.
In this embodiment, it is preferable to select the first plano-convex lens 04 and the second plano-convex lens 05 with different focal length combinations or the first conic lens 02 with different base angle angles according to the requirement, so as to change the spot size of the bessel beam after focusing the third conic lens 06, thereby being suitable for different application scenarios.
In some application scenes, the Bessel light beams with different focal depths 10 can be obtained by selecting the first conical lenses 02 with different base angles, and the adjustment is convenient.
In this embodiment, preferably, the base angles of the first and second conical lenses 02 and 03 are 1 ° to 10 °; alternatively, 1 °, 2 °, 3 °,4 °, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °.
In this embodiment, preferably, the base angle of the third conic lens 06 is 1 ° to 10 °; alternatively, 1 °, 2 °, 3 °,4 °, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °.
In an embodiment, the present utility model further provides a flight path cutting system, including: the bessel beam generating apparatus as described above.
In this embodiment, the bessel beam generating apparatus may arrange a corresponding lens distance according to a specific requirement of the flying optical path cutting system, and the adjustment is convenient and flexible.
It should be noted that, a big feature of the flight light path is that the length of the light path will change at any time, the designed optical system is not sensitive to the system light path, otherwise the final processing effect will be affected; the distance between the second conical lens and the 4f system and the distance between the 4f system and the third conical lens are adjustable, and can be well applied to a flying light path system.
In an application scene, referring to fig. 1, a laser outputs a light beam 01 with a wavelength of 532nm, a light beam M2 is less than 1.2, and a light spot radius r after beam expansion is 4mm; the beam of the laser output beam 01 after beam expansion passes through a first conical lens 02 to generate a Bessel beam, the base angle of the conical lens is 3 degrees, the focal depth of the generated Bessel beam is 120mm, and the diameter of a light spot is 18um; the first conical lens 02 generates Bessel beam to diverge and then collimate the Bessel beam through the second conical lens 03, and the collimated light spot is an annular beam 09; the annular light beam 09 is subjected to imaging shrinkage through a first plano-convex lens 04 and a second plano-convex lens 05, the focal length of the first plano-convex lens 04 is F90, and the focal length of the second plano-convex lens 05 is F30; the first distance 07 between the second conical lens 03 and the first plano-convex lens 04 is adjustable; the annular light spot after imaging and shrinking through the first plano-convex lens 04 and the second plano-convex lens 05 is focused through the third conical lens 06 to form a Bessel light beam with a new working distance of 50cm, a focal depth of 10mm and a light spot size of 5um, and the base angle of the third conical lens 06 is 6 degrees; the distance between the second plano-convex lens 05 and the third conical lens 06 can be freely adjusted through a mechanical structure, and the second distance 08 depends on the specific application scene; changing the first plano-convex lens 04 and the second plano-convex lens 05 or changing the conic lens 02 can change the spot size of the bessel beam after focusing by the third conic lens 06; changing the distance from the second conical lens 03 to the first conical lens 02 and the base angle of the third conical lens 06 can obtain Bessel beams with different working distances 11; the first conical lenses 02 with different base angle sizes can be used for obtaining Bessel beams with different focal depths 10.
The components (components not illustrating the specific structure) selected in the present utility model are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods.
In describing embodiments of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (7)
1. A bessel beam-generating apparatus, comprising:
the first conical lens (02), the second conical lens (03), the 4f system and the third conical lens (06) are sequentially arranged; wherein the method comprises the steps of
The cone tops of the first cone lens (02) and the second cone lens (03) are arranged in opposite directions;
the light beam between the second conical lens (03) and the 4f system is a collimated light beam;
the light beam between the 4f system and the third conical lens (06) is a collimated light beam.
2. The bessel beam-generating apparatus according to claim 1, wherein,
the base angles of the first conical lens (02) and the second conical lens (03) are the same.
3. The bessel beam-generating apparatus according to claim 1, wherein,
the second conical lens (03) is located behind the focal point of the first conical lens (02).
4. The bessel beam-generating apparatus according to claim 1, wherein,
the 4f system comprises a first plano-convex lens (04) and a second plano-convex lens (05).
5. The bessel beam-generating apparatus according to claim 1, wherein,
the base angles of the first conical lens (02) and the second conical lens (03) are 1-10 degrees.
6. The bessel beam-generating apparatus according to claim 1, wherein,
the base angle of the third conical lens (06) is 1-10 degrees.
7. A flying light path cutting system, comprising:
a bessel beam-generating apparatus according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321697005.5U CN220188814U (en) | 2023-06-30 | 2023-06-30 | Bessel beam generation device and flying light path cutting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321697005.5U CN220188814U (en) | 2023-06-30 | 2023-06-30 | Bessel beam generation device and flying light path cutting system |
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| Publication Number | Publication Date |
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| CN220188814U true CN220188814U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321697005.5U Active CN220188814U (en) | 2023-06-30 | 2023-06-30 | Bessel beam generation device and flying light path cutting system |
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| Country | Link |
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| CN (1) | CN220188814U (en) |
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- 2023-06-30 CN CN202321697005.5U patent/CN220188814U/en active Active
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