Laser focusing spot measurement system based on different wavelengths
By using a laser focusing spot measurement system based on different wavelengths, and by decomposing the laser with a wedge prism and a CCD camera, the problems of damage and high cost of ordinary measurement cameras are solved, and efficient and low-cost measurement of multi-wavelength lasers is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ORIENTECH CO LTD
- Filing Date
- 2023-07-05
- Publication Date
- 2026-06-05
AI Technical Summary
In the existing technology, ordinary measuring cameras are difficult to perform laser focused spot analysis, and dedicated measuring cameras are expensive, which leads to difficulties in use and increased costs.
A laser focusing spot measurement system based on different wavelengths is adopted. By adjusting the optical path design, a wedge prism is used to decompose the laser into reflected and transmitted beams. A CCD camera and a tail light absorber are used to reduce the laser energy to a safe level. Multi-wavelength laser measurement is performed by combining two sets of analysis components.
It enables focused spot analysis of lasers with different optical paths and wavelengths, reduces measurement costs, ensures that laser energy does not damage the measurement camera, and simplifies energy adjustment operations.
Smart Images
Figure CN122149630A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a laser focusing spot measurement system based on different wavelengths, belonging to the field of laser technology. Background Technology
[0002] In laser applications, beam quality analysis is performed on the laser spot according to actual usage requirements, including laser energy distribution analysis and laser spot circularity analysis. Spot analysis within the optical path can be achieved using ordinary measuring cameras. However, for lasers with a focused focal point, spot analysis is challenging because the laser energy at the focal point is typically very high, easily damaging the measuring camera and making it difficult to perform measurements with ordinary cameras. Dedicated focal point measuring cameras are also very expensive, significantly increasing the cost of use. Summary of the Invention
[0003] This invention provides a laser focusing spot measurement system based on different wavelengths, aiming to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a laser focusing spot measurement system based on different wavelengths, which, by adjusting the optical path, helps to avoid damage to the measurement camera caused by the focused spot.
[0004] The technical solution of this invention relates to a laser focusing spot measurement system based on different wavelengths, comprising: The housing (100) has two independent and symmetrically arranged cavities (110), and the upper wall of the cavity (110) has an opening; An analysis component (200), disposed within the housing (100), is used for spot analysis; the analysis component (200) includes a collimating lens (210) and a wedge prism (230) for decomposing the laser into a reflected beam and a transmitted beam, as well as a measuring camera (240) for measuring the reflected beam and a tail light absorber (250) for absorbing the transmitted beam; the collimating lens (210) is disposed at the opening, and the wedge prism (230) is disposed between the collimating lens (210) and the measuring camera (240); The analysis component (200) includes two sets, which are symmetrically arranged on the housing (100); one of the analysis components (200) is provided with a focusing lens (220), which is disposed between the wedge prism (230) and the measuring camera (240).
[0005] Furthermore, the reflected beam forms a right angle with the incident laser beam, and the transmitted beam forms an obtuse angle with the incident laser beam.
[0006] Furthermore, the tail light absorber includes multiple conical absorbers, with one bottom edge of two adjacent conical absorbers overlapping.
[0007] Furthermore, the tail light absorber includes multiple conical absorbers, and multiple wedge prisms are provided. The multiple conical absorbers are arranged in an arc shape and surround the outer periphery of the multiple wedge prisms.
[0008] Furthermore, the conical absorber is a square pyramid.
[0009] Furthermore, the surface of the conical absorbent is coated with an absorbent material.
[0010] Furthermore, the ratio of the cavity length of the conical absorber to the bottom side length of the conical absorber is set between 3 and 5.
[0011] Furthermore, laser light that is not absorbed by one of the conical absorbers is reflected to the other conical absorbers.
[0012] Furthermore, the measuring camera is a CCD camera.
[0013] The beneficial effects of this invention are as follows.
[0014] This invention relates to a laser focusing spot measurement system based on different wavelengths, applicable to spot analysis of different optical paths, particularly suitable for high-power laser measurement and analysis of different wavelengths, while simultaneously reducing costs. Using a wedge prism to extract a small amount of laser light for focused spot measurement helps ensure that the laser energy entering the measurement camera meets the camera's damage threshold requirements, thus facilitating the device's measurement of different optical paths, especially focused laser measurements of different wavelengths. Furthermore, by vertically positioning the laser incident light path and horizontally positioning the wedge prism's reflected light path, the laser energy entering the measurement camera can be adjusted by changing the incident angle of the wedge prism and the distance from the laser focus to the collimating prism; this adjustment is convenient and easy to operate. Additionally, the system includes two sets of analysis components and a second analysis component, enabling the device to analyze multi-wavelength laser focusing spots. By improving the structure of the tail light absorber, the absorption efficiency of the refracted beam is increased, while also contributing to cost reduction. Attached Figure Description
[0015] Figure 1 This is a front structural schematic diagram of a laser focusing spot measurement system according to an embodiment of the present invention.
[0016] Figure 2 This is a top view structural diagram of a laser focusing spot measurement system according to an embodiment of the present invention.
[0017] Figure 3 This is a schematic diagram of the optical path principle of a laser focusing spot measurement system according to an embodiment of the present invention.
[0018] Figure 4 This is a schematic diagram of the tail light absorber of a laser focusing spot measurement system according to an embodiment of the present invention.
[0019] Figure 5 This is a schematic diagram of the optical path principle of the wedge prism in the laser focusing spot measurement system according to an embodiment of the present invention.
[0020] Figure 6 This is a schematic diagram of the structure of multiple wedge prisms and multiple conical absorbers according to an embodiment of the present invention.
[0021] Figure label: Detailed Implementation
[0022] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0023] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," "right," "top," and "bottom" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.
[0024] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and not for limiting the invention. The term "and / or" as used herein includes any combination of one or more of the associated listed items.
[0025] It should be understood that although terms such as "component," "third," etc. may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from one another. For example, an element may also be referred to as an element without departing from the scope of this disclosure, and similarly, an element may also be referred to as an element.
[0026] See Figures 1 to 6The present invention discloses a laser focusing spot measurement system based on different wavelengths, comprising a housing 100 and an analysis component 200, wherein the housing 100 has an opening. The analysis component 200 is disposed within the housing 100 and is used for spot analysis. The analysis component 200 includes a collimating lens 210, a wedge prism 230 for decomposing the laser into a reflected beam and a transmitted beam, a measuring camera 240 for measuring the reflected beam, and a tail light absorber 250 for absorbing the transmitted beam. The laser focus 300 is disposed at the opening. The collimating lens 210 is disposed at the opening, and the wedge prism 230 is disposed between the collimating lens 210 and the measuring camera 240. One of the analysis components 200 is provided with a focusing lens 220, which is disposed between the wedge prism 230 and the measuring camera 240.
[0027] The laser focusing spot measurement system of this invention can be applied to spot analysis of different optical paths, and is particularly suitable for the measurement and analysis of high-power laser focusing spots of different wavelengths, while also reducing costs. The laser focusing spot measurement system uses a wedge prism 230 to extract a small amount of laser light for focused spot measurement, which helps ensure that the laser energy entering the measurement camera 240 meets the camera's damage threshold requirements. This facilitates the device's measurement of different optical paths, especially focused laser measurements of different wavelengths. Furthermore, by setting the incident laser path vertically and the reflected laser path of the wedge prism 230 horizontally, the laser energy entering the measurement camera 240 can be adjusted by changing the incident angle of the wedge prism 230 and the distance from the laser focus 300 to the collimating prism. This adjustment is convenient and easy to operate. Additionally, two sets of analysis components 200 are provided to meet the device's needs for analyzing multi-wavelength laser focusing spots. Specifically, one of the analysis components 200 of the present invention is not provided with a focusing lens 220 and can be used to measure violet laser and green laser, while the other analysis component 200 provided with a focusing lens 220 can be used to measure carbon dioxide laser spot.
[0028] In one embodiment, see Figures 1 to 3 In this embodiment of the invention, two analysis components 200 are provided, symmetrically arranged on the housing 100, thereby enabling the device to analyze multi-wavelength laser focused spots. See also Figure 2The housing 100 is provided with two independent and symmetrically arranged cavities 110, and the upper wall of the cavity 110 is provided with an opening. The analysis component 200 includes a mirror housing, a collimating lens 210, a focusing lens 220, and a wedge prism 230 for resolving the laser into a reflected beam and a transmitted beam, as well as a measuring camera 240 for measuring the reflected beam and a tail light absorber 250 for absorbing the transmitted beam. The mirror housing is inserted through the opening and has an entrance port that serves as the laser focus 300. The collimating lens 210 is located below the entrance port. The wedge prism 230 is obliquely disposed within the mirror housing and between the collimating lens 210 and the focusing lens 220. The focusing lens 220 and the measuring camera 240 are both disposed within the cavity 110. The centerline of the focusing lens 220 and the centerline of the lens of the measuring camera 240 are on the same horizontal line. The tail light absorber 250 is located on the side of the wedge prism 230 facing away from the entrance port. The reflectivities of the two wedge prisms 230 are not equal.
[0029] See Figure 1 and Figure 2 The upper wall of the housing 100 has an opening, through which the mirror housing of the analysis component 200 passes and is fixed to the upper side of the housing 100. The lower side of the mirror housing is located within the cavity 110 of the housing 100, and the upper side of the mirror housing protrudes from the housing 100 through the opening, serving as the entrance for the laser focus 300. A wedge prism 230 is disposed within the mirror housing and is tilted to reflect the laser. The mirror housing has an exit port located within the cavity 110 of the housing 100, with its centerline horizontal. The focusing lens 220 and the measuring camera 240 are both disposed within the cavity 110 of the housing 100, with the centerlines of the exit port, the focusing lens 220, and the lens centerline of the measuring camera 240 all aligned on the same horizontal line. Specifically, the incident laser beam enters the inner cavity of the mirror housing vertically through the entrance port and reaches the wedge prism 230. The wedge prism 230 splits the laser beam into a reflected beam and a transmitted beam. The reflected beam exits horizontally from the exit port of the mirror housing and, after passing through the focusing lens 220, reaches the measuring camera 240. Simultaneously, the transmitted beam reaches the tail light absorber 250 and is absorbed. Furthermore, the reflected beam is at a right angle to the incident laser beam, and the transmitted beam is at an obtuse angle to the incident laser beam, thereby simplifying the optical path design. The magnitude of the laser energy entering the measuring camera 240 can be adjusted by adjusting the reflectivity of the wedge prism 230 and / or the distance from the entrance port to the collimating lens 210.
[0030] In one application example, see Figure 5 Without considering the influence of polarization, and assuming the laser to be measured is approximated as natural light for energy analysis, the reflectivity of the wedge prism 230 in this embodiment of the invention is obtained according to the following formula: In the formula, k represents the reflectivity of the wedge prism 230; a1 represents the incident angle of the wedge prism 230; and a2 represents the reflection angle of the wedge prism 230.
[0031] In one application embodiment, one analysis component 200 is used for focused spot analysis of ultraviolet and green lasers. When used for ultraviolet and green laser measurements, the reflectivity of the wedge prism 230 corresponding to the analysis component 200 is set to less than 1.5%. The other analysis component 200 is used for focused spot analysis of carbon dioxide lasers. When used for carbon dioxide laser measurements, the reflectivity of the wedge prism 230 corresponding to the analysis component 200 is less than 1%. This multi-wavelength laser focused spot analysis system of the present invention has two sets of analysis components 200, respectively used for focused spot analysis of ultraviolet and green lasers and carbon dioxide lasers, enabling the measurement and analysis of high-power lasers of different wavelengths.
[0032] In one application embodiment, the distance from the entrance port to the collimating lens 210 is approximately 14.5 mm. Preferably, when the analysis component 200 is used for focused spot analysis of ultraviolet lasers and green lasers, the distance from its entrance port to the collimating lens 210 is set to 14.5415 mm, while when the analysis component 200 is used for focused spot analysis of carbon dioxide lasers, the distance from its entrance port to the collimating lens 210 is set to 14.5542 mm.
[0033] In one embodiment, see Figure 4 The tail light absorber 250 includes a plurality of tapered absorbers 251, which are arranged according to the reflected light path of the tail light absorber 250. See also Figure 3 The conical absorber 251 is a square pyramid, with one base edge of two adjacent conical absorbers 251 coinciding. The surface of the conical absorber 251 is coated with an absorbing material. Thus, when the transmitted light beam from the wedge prism 230 reaches one of the conical absorbers 251, part of the laser is absorbed, while the unabsorbed laser is reflected and reaches other conical absorbers 251, where it is further absorbed. This helps prevent the laser from harming the human body. Furthermore, in this embodiment, the ratio of the cavity length L to the base edge length d of the conical absorber 251 is set between 3 and 5, thereby achieving a better absorption effect. The tail light absorber 250 of this embodiment, based on absorption solely through the coating material, improves the structure of the conical absorber 251, allowing the laser beam to be reflected and repeatedly absorbed multiple times, thereby improving the laser absorption efficiency and reducing the device cost.
[0034] In one application embodiment, the absorption rate of the tail light absorber 250 of this embodiment is obtained according to the following formula: In the formula, h represents the absorptivity of the tail light absorber 250, ε represents the absorptivity of the coated absorbing material, S represents the aperture area of the tail light absorber 250, S1 represents the inner surface area of the tail light absorber 250, and S2 represents the main surface area of the tail light absorber 250 at the same depth as the cavity along the aperture normal direction.
[0035] In one application example, see Figure 6 In this embodiment of the invention, multiple wedge prisms 230 are provided, and multiple conical absorbers 251 are arranged in an arc shape and surround the outer periphery of the multiple wedge prisms 230. See also Figure 4 The reflecting and transmitting surfaces of the wedge prism 230 are respectively disposed on opposite sides of the wedge prism 230, with the reflecting surface of one wedge prism 230 facing the other wedge prism 230, while its transmitting surface faces the conical absorber 251 disposed on the outer periphery. The arc-shaped absorber wall formed by the multiple wedge prisms 230 surrounds the outer periphery of the multiple wedge prisms 230, thereby helping to prevent the transmitted beam from causing harm to the body.
[0036] Furthermore, in this embodiment of the invention, multiple wedge prisms 230 are provided. After the laser is reflected by multiple wedge prisms 230, it can be emitted from a direction parallel to the incident laser or from a direction perpendicular to the incident laser. Furthermore, the distance between adjacent wedge prisms 230 is reasonably set so that the laser emitted from the rear surface of the previous wedge prism 230 will not enter the block wedge prism 230, thereby helping to ensure that the test beam is not contaminated by other stray light.
[0037] In one embodiment, the measuring camera 240 is a CCD camera. After the laser is reflected by the wedge prism 230 and focused by the focusing lens 220, it reaches the CCD surface of the lens focal plane. The size of the light spot is obtained by CCD measurement, thereby enabling the acquisition of the light spot size in the visible to near-infrared band.
[0038] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure, as long as they achieve the same technical effects, should be included within the scope of protection of this disclosure and fall under the protection scope of the present invention. Within the protection scope of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.
Claims
1. A laser focusing spot measurement system based on different wavelengths, characterized in that, include: The housing (100) has two independent and symmetrically arranged cavities (110), and the upper wall of the cavity (110) has an opening; An analysis component (200), disposed within the housing (100), is used for spot analysis; the analysis component (200) includes a collimating lens (210) and a wedge prism (230) for decomposing the laser into a reflected beam and a transmitted beam, as well as a measuring camera (240) for measuring the reflected beam and a tail light absorber (250) for absorbing the transmitted beam; the collimating lens (210) is disposed at the opening, and the wedge prism (230) is disposed between the collimating lens (210) and the measuring camera (240); The analysis component (200) comprises two sets, which are symmetrically arranged on the housing (100). One of the analysis components (200) allows for the measurement of violet laser and green laser. The other analysis component (200) is provided with a focusing lens (220) and allows for the measurement of carbon dioxide laser spot. The focusing lens (220) is disposed between the wedge prism (230) and the measuring camera (240).
2. The laser focusing spot measurement system based on different wavelengths according to claim 1, characterized in that, The reflected beam forms a right angle with the incident laser beam, and the transmitted beam forms an obtuse angle with the incident laser beam.
3. The laser focusing spot measurement system based on different wavelengths according to claim 1, characterized in that, The tail light absorber (250) includes a plurality of conical absorbers (251), with one bottom edge of two adjacent conical absorbers (251) overlapping.
4. The laser focusing spot measurement system based on different wavelengths according to claim 3, characterized in that, The wedge prism (230) is provided in multiple forms, and the multiple conical absorbers (251) are arranged in an arc shape and surround the outer periphery of the multiple wedge prisms (230).
5. The laser focusing spot measurement system based on different wavelengths according to claim 3, characterized in that, The conical absorber (251) is a square pyramid.
6. The laser focusing spot measurement system based on different wavelengths according to claim 5, characterized in that, The surface of the conical absorber (251) is coated with an absorbent material.
7. The laser focusing spot measurement system based on different wavelengths according to claim 5, characterized in that, The ratio of the cavity length of the conical absorber (251) to the bottom side length of the conical absorber (251) is set between 3 and 5.
8. The laser focusing spot measurement system based on different wavelengths according to claim 7, characterized in that, Laser light that is not absorbed by one of the conical absorbers (251) is reflected to the other conical absorbers (251).
9. The laser focusing spot measurement system based on different wavelengths according to claim 1, characterized in that, The measuring camera (240) is a CCD camera.