Laser collimation and beam expansion optical system based on aberration gain
By adjusting the aberrations of the optical system through aberration gain, and using a single lens to achieve laser beam expansion adjustment, the problem of complexity in traditional multi-lens design is solved, and the convenience and system stability of laser beam expansion are improved.
Patent Information
- Application Number
- CN202422896690.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Traditional laser beam expander optical systems are complex to design, and the collaborative operation of multiple lens groups increases the difficulty of processing and assembly, resulting in high costs and unstable quality.
By employing an aberration gain-based method, laser beam expansion adjustment is achieved by adjusting the aberration of the optical system through the movement of a single lens, thus simplifying the design of the optical system.
It simplifies the design of the optical system, reduces costs and complexity, and improves the convenience of laser beam expansion and the stability of the system.
Smart Images
Figure CN223471200U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to laser technology field, concretely relates to a laser collimation beam expanding optical system based on aberration gain. BACKGROUND
[0002] Laser long-distance transmission technology as a hot spot direction in current laser application field, not only represents the frontier exploration of technology, also indicates the important trend of future science and technology development. Laser transmission mainly depends on precision optical system, and the light beam that laser transmits is collimated and expanded, thereby realizing effective transmission of laser in long distance. In practical application, the light beam size after laser expansion often needs to be flexibly adjusted according to specific transmission requirements, such as transmission distance, target spot size and the like.
[0003] In the traditional optical design process, in order to realize the accurate adjustment of the expansion target at different distances, the zooming mode is usually adopted. This mode needs multiple mirror groups to work cooperatively, and the adjustment of the expansion target at different distances is realized by changing the focal length of the lens in the mirror group. However, this multi-mirror group design not only increases the complexity of the optical system, but also makes the machining and assembly process more complicated, thereby adversely affecting the cost, quality and stability of the product. SUMMARY
[0004] In order to solve the problems in the prior art, the utility model provides a laser collimation beam expanding optical system based on aberration gain, which realizes the adjustment process of laser expansion by adjusting the aberration of the optical system, and the process can be realized by only a single lens, greatly simplifying the design and machining process of the optical system, improving the convenience of laser expansion, and reducing the cost and complexity of the product.
[0005] To achieve the above object, the technical scheme of the utility model is as follows: a laser collimation beam expanding optical system based on aberration gain, comprising a laser output head, a first beam expanding mirror group arranged in alignment with the laser output head, a reflecting mirror reflecting the output light beam of the first beam expanding mirror group, and a second beam expanding mirror group arranged in alignment with the reflecting mirror.
[0006] The first beam expanding mirror group comprises a first lens, a second lens and a third lens arranged in sequence and movably arranged.
[0007] The second beam expanding mirror group comprises a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence.
[0008] Further, the first beam expanding mirror group and the second beam expanding mirror group are arranged vertically and in "L" shape.
[0009] Further, the first lens has a concave side towards the laser output head and a convex side away from the laser output head, and the focal length of the first lens is positive.
[0010] The second lens has a convex side towards the laser output head and a concave side away from the laser output head, and the focal length of the second lens is negative.
[0011] The third lens has a convex side towards the laser output head and a convex side away from the laser output head, and the focal length of the third lens is positive.
[0012] The fifth lens has a plane side towards the mirror and a concave side away from the mirror, and the focal length of the fifth lens is negative.
[0013] The sixth lens has a concave side towards the mirror and a convex side away from the mirror, and the focal length of the sixth lens is positive.
[0014] The seventh lens has a concave side towards the mirror and a concave side away from the mirror, and the focal length of the seventh lens is negative.
[0015] The eighth lens has a convex side towards the mirror and a convex side away from the mirror, and the focal length of the eighth lens is positive.
[0016] Further, the distance between the laser output head and the first lens is 80-90 mm; the air gap between the first lens and the second lens is 4-6 mm; the air gap between the second lens and the initial position of the third lens is 13-15 mm; the air gap between the third lens and the mirror is 60-80 mm; the air gap between the mirror and the fifth lens is 60-80 mm; the air gap between the fifth lens and the sixth lens is 380-420 mm; the air gap between the sixth lens and the seventh lens is 4-6 mm; and the air gap between the seventh lens and the eighth lens is 50-65 mm.
[0017] Further, the mirror is a plane mirror.
[0018] Further, the laser output head outputs laser with a wavelength of 808±10 nm.
[0019] Further, the moving distance of the third lens is ≤5 mm.
[0020] Further, the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all spherical lenses.
[0021] Further, the spherical lenses are all glass spherical lenses.
[0022] Further, the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all made of K9 glass.
[0023] The utility model discloses the beneficial effect that reaches:
[0024] 1, the utility model discloses the adjustment process of laser beam expanding is realized through the mode of adjusting optical system aberration, compared with the traditional zoom mode, only through the movement of single lens (i.e. third lens) can realize the adjustment of laser beam expanding, greatly simplifies the design of beam expanding adjustment light path, and the far field beam divergence angle can be realized continuous regulation through aberration gain, and then realizes the continuous expansion of light beam, not only improves the convenience of laser beam expanding, but also reduces the cost and complexity of product.
[0025] 2, the utility model discloses the simplification of system structure, so that the adjustment of laser beam expanding becomes more convenient, and the user can realize the required beam expanding effect through simple operation.
[0026] 3, the utility model reduces the demand of multiple mirror groups working together, reduces the system stability problem caused by improper cooperation between mirror groups, and improves the overall reliability of the system. DRAWINGS
[0027] Fig. 1 It is the whole structure schematic diagram of the utility model;
[0028] Fig. 2 It is the far field center field light spot column chart when the third lens is located in the initial position P0 in the utility model;
[0029] Fig. 3 It is the far field center field light spot column chart when the third lens is located in the transmittance detection position P1 in the utility model, and |P0-P1|=5mm.
[0030] Marking in the drawing: 1, first lens;2, second lens;3, third lens;4, reflector;5, fifth lens;6, sixth lens;7, seventh lens;8, eighth lens;P, laser output head;P0, third lens initial position;P1, third lens transmittance detection position. CONCRETE IMPLEMENTATION
[0031] In order to better understand the purpose, structure and function of the utility model, the utility model is described in further detail below in combination with the drawings.
[0032] As Figs. 1 to 3As shown, an aberration gain-based laser collimation and beam expansion optical system includes a laser output head P, the laser output head P outputs a light beam direction aligned with a first beam expansion lens group, the first beam expansion lens group outputs a light beam direction aligned with a mirror 4, and the mirror 4 reflects a light beam direction aligned with a second beam expansion lens group. The mirror 4 vertically reflects the light beam emitted by the laser output head P, and the first beam expansion lens group and the second beam expansion lens group are vertically and "L"-shaped.
[0033] The laser output head P of the transmission laser light path outputs a laser wavelength of 808±10nm.
[0034] The first beam expansion lens group includes a first lens 1, a second lens 2, and a third lens 3 arranged in sequence, and the third lens 3 is movably arranged. The third lens 3 can move away from the second lens 2, and the maximum moving distance of the third lens 3 is 5mm. The third lens 3 can move from the third lens initial position P0 to the third lens transmittance detection position P1 away from the second lens 2, and |P0-P1|≤5mm. When the third lens 3 continuously changes within the position |P0-P1|≤5mm, the laser realizes continuous beam expansion. The side of the first lens 1 facing the laser output head P is concave, and the side away from the laser output head P is convex, and the focal length of the first lens 1 is positive. The side of the second lens 2 facing the laser output head P is convex, and the side away from the laser output head P is concave, and the focal length of the second lens 2 is negative. The side of the third lens 3 facing the laser output head P is convex, and the side away from the laser output head P is convex, and the focal length of the third lens 3 is positive.
[0035] The mirror 4 is a plane mirror 4, which changes the direction of the light beam output by the first beam expansion lens group and enters the second beam expansion lens group.
[0036] The second beam expansion lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8 arranged in sequence. The side of the fifth lens 5 facing the mirror 4 is a plane, and the side away from the mirror 4 is concave, and the focal length of the fifth lens 5 is negative. The side of the sixth lens 6 facing the mirror 4 is concave, and the side away from the mirror 4 is convex, and the focal length of the sixth lens 6 is positive. The side of the seventh lens 7 facing the mirror 4 is concave, and the side away from the mirror 4 is concave, and the focal length of the seventh lens 7 is negative. The side of the eighth lens 8 facing the mirror 4 is convex, and the side away from the mirror 4 is convex, and the focal length of the eighth lens 8 is positive.
[0037] The first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are all spherical lenses, and the spherical lenses are all glass spherical lenses. The material of the glass spherical lens is K9 glass, so as to simplify the material selection process.
[0038] An aberration gain-based laser collimation and beam expansion optical system satisfies the following relationship:
[0039] The distance between the laser output head P and the first lens 1 is 80mm-90mm; the air interval between the first lens 1 and the second lens 2 is 4mm-6mm; the air interval between the second lens 2 and the third lens initial position P0 is 13mm-15mm; the air interval between the third lens 3 and the mirror 4 is 60mm-80mm; the air interval between the mirror 4 and the fifth lens 5 is 60mm-80mm; the air interval between the fifth lens 5 and the sixth lens 6 is 380mm-420mm; the air interval between the sixth lens 6 and the seventh lens 7 is 4mm-6mm; and the air interval between the seventh lens 7 and the eighth lens 8 is 50mm-65mm.
[0040] In the utility model, each spherical lens adopts concave and convex surface structure and positive and negative focal length combination, and the optical system focal power is reasonably distributed to reasonably realize the function of the laser collimation and beam expansion optical system based on aberration gain.
[0041] As shown in the drawings, Fig. 1 In the embodiment, the third lens 3 moves from the third lens initial position P0 to the third lens transmittance detection position P1 away from the second lens 2, and |P0-P1|=5mm.
[0042] In the embodiment, the third lens 3 moves to meet the above range, and the adjustment process of laser beam expansion is realized.
[0043] As shown in the drawings, Fig. 2 When the third lens 3 is located at the third lens initial position P0, the far field central field spot column diagram is less than the Airy spot size.
[0044] As shown in the drawings, Fig. 3 When the third lens 3 moves to the third lens transmittance detection position P1, |P0-P1|=5mm, the far field central field spot column diagram, and the spot radius can reach 170μm.
[0045] The laser collimation and beam expansion optical system based on aberration gain satisfies the following relationship:
[0046] The distance between the laser output head P and the first lens 1 is 80mm-90mm; the air interval between the first lens 1 and the second lens 2 is 4mm-6mm; the air interval between the second lens 2 and the third lens initial position P0 is 13mm-15mm; the air interval between the third lens 3 and the mirror 4 is 60mm-80mm; the air interval between the mirror 4 and the fifth lens 5 is 60mm-80mm; the air interval between the fifth lens 5 and the sixth lens 6 is 380mm-420mm; the air interval between the sixth lens 6 and the seventh lens 7 is 4mm-6mm; and the air interval between the seventh lens 7 and the eighth lens 8 is 50mm-65mm.
[0047] In the embodiment, the lens combination structure meeting the above lens relations can easily realize collimation and beam expansion of the laser beam and realize reasonable distribution of optical power, better corrects aberrations such as spherical aberration and coma, and improves the beam collimation effect of the optical system.
[0048] As shown in Fig. 1 , the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all spherical lenses.
[0049] In the embodiment, the path of the off-axis light is reasonably controlled by optimizing the lens curvature, and the loss of the edge light is reduced.
[0050] As shown in Fig. 1 , in the embodiment, the spherical lenses are all glass spherical lenses.
[0051] In the embodiment, the spherical lenses are all made of K9 glass to simplify the selection process of the material.
[0052] In the embodiment, the transmission laser emission light path has a focal length of 365mm, as shown in Fig. 1 , the specific parameters of each lens are shown in the following table:
[0053] Serial number Focal length / mm Distance / mm Material Laser output head P / 86.5 / Lens 1 214.6 5 K9 Lens 2 908 14 K9 Lens 3 195 67 K9 Mirror 44 / 65 / Lens 5 220 400 K9 Lens 6 853.5 5 K9 Lens 7 1021 57 K9 Lens 8 825 / K9
[0054] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and range of the utility model.In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and range of the utility model.Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the range protected by the utility model.
Claims
1. An aberration gain-based laser collimation beam expansion optical system, characterized in that: comprising a laser output head (P), a first beam expansion lens group arranged in alignment with the laser output head (P), a reflecting mirror (4) reflecting the output beam of the first beam expansion lens group, and a second beam expansion lens group arranged in alignment with the reflecting mirror (4); the first beam expansion lens group comprises a first lens (1), a second lens (2) and a third lens (3) arranged in sequence, and the third lens (3) is movably arranged; the second beam expansion lens group comprises a fifth lens (5), a sixth lens (6), a seventh lens (7) and an eighth lens (8) arranged in sequence. The first beam expansion lens group and the second beam expansion lens group are arranged vertically and in an "L" shape.
2. The laser collimating beam expanding optical system based on aberration gain according to claim 1, wherein:
3. The aberration gain-based laser collimation beam expansion optical system according to claim 1, characterized in that: the first lens (1) is concave on the side facing the laser output head (P) and convex on the side facing away from the laser output head (P), and the focal length of the first lens (1) is positive; the second lens (2) is convex on the side facing the laser output head (P) and concave on the side facing away from the laser output head (P), and the focal length of the second lens (2) is negative; the third lens (3) is convex on the side facing the laser output head (P) and convex on the side facing away from the laser output head (P), and the focal length of the third lens (3) is positive; the fifth lens (5) is flat on the side facing the reflecting mirror (4) and concave on the side facing away from the reflecting mirror (4), and the focal length of the fifth lens (5) is negative; the sixth lens (6) is concave on the side facing the reflecting mirror (4) and convex on the side facing away from the reflecting mirror (4), and the focal length of the sixth lens (6) is positive; the seventh lens (7) is concave on the side facing the reflecting mirror (4) and concave on the side facing away from the reflecting mirror (4), and the focal length of the seventh lens (7) is negative; the eighth lens (8) is convex on the side facing the reflecting mirror (4) and convex on the side facing away from the reflecting mirror (4), and the focal length of the eighth lens (8) is positive. The distance between the laser output head (P) and the first lens (1) is 80-90 mm; the air gap between the first lens (1) and the second lens (2) is 4-6 mm; the air gap between the second lens (2) and the initial position (P0) of the third lens is 13-15 mm; the air gap between the third lens (3) and the reflecting mirror (4) is 60-80 mm; the air gap between the reflecting mirror (4) and the fifth lens (5) is 60-80 mm; the air gap between the fifth lens (5) and the sixth lens (6) is 380-420 mm; the air gap between the sixth lens (6) and the seventh lens (7) is 4-6 mm; the air gap between the seventh lens (7) and the eighth lens (8) is 50-65 mm. The reflecting mirror (4) is a plane mirror (4).
4. The laser collimation beam expanding optical system based on aberration gain according to claim 3, characterized in that: 5. The laser collimation beam expanding optical system based on aberration gain according to claim 1, wherein: 6. The laser collimation beam expanding optical system based on aberration gain according to claim 1, wherein: The laser output head (P) outputs laser wavelength 808nm±10nm.
7. The laser collimation beam expanding optical system based on aberration gain according to claim 1, wherein: The moving distance of the third lens (3) is less than or equal to 5mm.
8. The laser collimation beam expanding optical system based on aberration gain according to claim 1, wherein: The first lens (1), the second lens (2), the third lens (3), the fifth lens (5), the sixth lens (6), the seventh lens (7) and the eighth lens (8) are all spherical lenses.
9. The laser collimation beam expanding optical system based on aberration gain according to claim 8, wherein: The spherical lenses are all glass spherical lenses.
10. The laser collimation beam expanding optical system based on aberration gain according to claim 9, wherein: The first lens (1), the second lens (2), the third lens (3), the fifth lens (5), the sixth lens (6), the seventh lens (7) and the eighth lens (8) are all made of K9 glass.