A wide spectrum holographic beam shaping system
By using dispersive optical elements and lenses in the laser processing system to combine beam splitting holograms, beam splitting and beam splitting of beams of different wavelengths is achieved, solving the problem of degradation in sub-beam spot quality caused by wavelength coverage and improving laser processing performance.
Patent Information
- Application Number
- CN202310402237.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-17
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2043-04-17
AI Technical Summary
In laser processing, when the wavelength of the incident laser light covers a certain wavelength range, the quality of the sub-beam spot decreases, resulting in the laser processing performance being affected.
A wide-spectrum holographic beam shaping system is adopted, including dispersion optical elements, lenses and beam splitting holograms. The beams of different wavelengths are deflected to different regions through the dispersion elements. The corresponding regions of the beam splitting hologram are customized to divide the beam, and The wavelength beam-blowing is performed by the second dispersion optical element to ensure that each sub-beam contains all incident wavelengths and has a consistent travel direction.
It effectively avoids the beam quality reduction caused by the concentration of all wavelength beams in the same area in the traditional system, forming a high-quality broad-spectrum holographic beam, and improving laser processing performance.
Smart Images
Figure CN117850055B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of laser processing, in particular to a wide-spectrum holographic beam shaping system. Background Art
[0002] In applications such as laser processing, holograms are often used to split a laser beam into multiple sub-beams. Figure 1 Generally, it is sensitive to wavelength, that is, different beam deflection angles are introduced for beams of different wavelengths. This type of beam splitting hologram achieves beam splitting by modulating the spatial phase of the incident light wavefront. For example, if the phase modulation amount for a 1064nm beam is 2pi, then the phase modulation amount for a 1100nm beam will be less than 2pi. Therefore, in the design process of a beam splitting hologram, it is necessary to compensate and adjust the wavelength of the incident beam.
[0003] When the wavelength of the incident laser covers a certain wavelength range, it will cause Figure 1 The degradation of the sub-beam spot quality shown has a negative impact on the performance of the laser processing. Summary of the invention
[0004] The purpose of the present invention is to provide a wide-spectrum holographic beam shaping system to solve the problem that when the wavelength of the incident laser covers a certain wavelength range, the quality of the sub-beam spot will be reduced, which will have a negative impact on the performance of laser processing.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A wide-spectrum holographic beam shaping system comprises a dispersive optical element 1, a lens 1, a beam splitting hologram, a lens 2 and a dispersive optical element 2, wherein the dispersive element 1 and the beam splitting hologram are respectively placed on the front and rear focal planes of the lens 1, and the beam splitting hologram and the dispersive optical element 2 are respectively placed on the front and rear focal planes of the lens 2.
[0007] The dispersive optical element 1 deflects light beams of different wavelengths to different angles along the dispersion plane (yz plane), and the lens 1 further collimates light beams of different wavelengths and makes them incident on different regions of the beam splitting hologram.
[0008] The corresponding different wavelength hologram areas on the splitting hologram split the wavelength light beam in the splitting plane (xz plane), and the design of the hologram in this area is customized for the corresponding wavelength; specifically, the laser beam is split into multiple laser beams according to the energy ratio requirements.
[0009] The specific positions of the hologram regions with different wavelengths corresponding to the beam splitting hologram are calculated based on the dispersion angles of the dispersive optical element 1 for different wavelengths and the focal length of the lens 1 .
[0010] The light beam continues to pass through the optical system, passes through the dispersive optical element 2, and forms a wavelength beam on the dispersion plane. At this time, the beam splitting plane spot does not change. Finally, each sub-beam contains all the incident wavelengths, and the traveling direction of each wavelength remains consistent, and there is no dispersion phenomenon.
[0011] If the beam splitting hologram is a reflective device, the dispersion element 1 and the dispersion element 2 can share a dispersion element.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] The present invention distributes light beams of different wavelengths to different areas of the hologram through the dispersion element 1, and the hologram pattern of the corresponding area is optimized accordingly for the wavelength, and then the dispersion element 2 is used to combine the wavelengths to form a high-quality wide-spectrum holographic light beam control, thereby avoiding the problem that light beams of all wavelengths in the traditional system are incident on the same area of the hologram, causing a decrease in beam quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 For the traditional holographic beam shaping system, the incident beam directly hits the beam splitting hologram;
[0015] Figure 2 It is the framework of the wide-spectrum holographic beam shaping system of the present invention. DETAILED DESCRIPTION
[0016] In order to clarify the technical problems, technical solutions, implementation processes and performance demonstrations, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are for explanation only. The present invention is not intended to limit the present invention. Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings do not have to be drawn to scale unless otherwise specified.
[0017] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0018] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present disclosure.
[0019] Example 1
[0020] like Figure 2 As shown, a wide-spectrum holographic beam shaping system comprises a dispersive optical element 1, a lens 1, a beam splitting hologram, a lens 2 and a dispersive optical element 2, wherein the dispersive element 1 and the beam splitting hologram are respectively placed on the front and rear focal planes of the lens 1, and the beam splitting hologram and the dispersive optical element 2 are respectively placed on the front and rear focal planes of the lens 2.
[0021] The dispersive optical element 1 deflects light beams of different wavelengths to different angles along the dispersion plane (yz plane), and the lens 1 further collimates light beams of different wavelengths and makes them incident on different regions of the beam splitting hologram.
[0022] The corresponding different wavelength hologram areas on the splitting hologram split the wavelength light beam in the splitting plane (xz plane), and the design of the hologram in this area is customized for the corresponding wavelength; specifically, the laser beam is split into multiple laser beams according to the energy ratio requirements.
[0023] The specific positions of the hologram regions with different wavelengths corresponding to the beam splitting hologram are calculated based on the dispersion angles of the dispersive optical element 1 for different wavelengths and the focal length of the lens 1 .
[0024] The light beam continues to pass through the optical system, passes through the dispersive optical element 2, and forms a wavelength beam on the dispersion plane. At this time, the beam splitting plane spot does not change. Finally, each sub-beam contains all the incident wavelengths, and the traveling direction of each wavelength remains consistent, and there is no dispersion phenomenon.
[0025] As a possible implementation, if the beam splitting hologram is a reflective device, the dispersion element 1 and the dispersion element 2 may share a dispersion element.
[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A broadband holographic beam shaping system, characterized in that: The invention is composed of a dispersive optical element 1, a lens 1, a beam splitting hologram, a lens 2 and a dispersive optical element 2, wherein the dispersive optical element 1 and the beam splitting hologram are respectively placed on the front and rear focal planes of the lens 1, and the beam splitting hologram and the dispersive optical element 2 are respectively placed on the front and rear focal planes of the lens 2; the dispersive optical element 1 deflects light beams of different wavelengths to different angles along the dispersive plane, and the dispersive plane is a yz plane; the lens 1 further collimates light beams of different wavelengths and makes them incident on different areas of the beam splitting hologram; the beam splitting hologram The corresponding hologram areas of different wavelengths on the hologram split the wavelength light beam on the beam splitting plane, the beam splitting plane is the xz plane, and the design of the hologram area is customized for the corresponding wavelength; the beam splitting hologram splits the laser beam into multiple laser beams according to the energy ratio requirement; the light beam continues to pass through the optical system, passes through the dispersive optical element 2, and forms a wavelength combined beam on the dispersion plane. At this time, the light spot on the beam splitting plane does not change, and finally each sub-beam contains all the incident wavelengths, and the traveling direction of each wavelength remains consistent, and there is no dispersion phenomenon.
2. A wide spectrum holographic beam shaping system according to claim 1, characterized in that: The specific positions of the hologram regions with different wavelengths corresponding to the beam splitting hologram are calculated based on the dispersion angles of the dispersive optical element 1 for different wavelengths and the focal length of the lens 1 .
3. The broadband holographic beam shaping system according to claim 1, characterized in that: If the beam splitting hologram is a reflective device, the dispersive optical element 1 and the dispersive optical element 2 can share a dispersive element.