A Novel Optical Lens for Focusing and Obtaining Bessel-Gaussian Beams with Long Focal Depth

A technology of optical lens and focusing spot, which is applied in the direction of optics, lens, optical components, etc., can solve the problem of extremely high precision of mechanical assembly, and achieve the effect of improving laser fine processing technology and wide applicability

Active Publication Date: 2017-06-20
SHANGHAI EMPOWER AUTOMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the difference in the peak power density of the spot within the focal depth range of the axicon lens is relatively obvious, and the requirements for mechanical assembly precision are extremely high, so it is difficult to be widely used in the industrial laser processing industry

Method used

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  • A Novel Optical Lens for Focusing and Obtaining Bessel-Gaussian Beams with Long Focal Depth
  • A Novel Optical Lens for Focusing and Obtaining Bessel-Gaussian Beams with Long Focal Depth
  • A Novel Optical Lens for Focusing and Obtaining Bessel-Gaussian Beams with Long Focal Depth

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Embodiment 1

[0033] The rings of the coaxial multi-ring Gaussian mirror are equally spaced, and the width of the rings 3 is T, which is conducive to improving the stability of the lens in different laser modes. Each ring 3 is a spherical ring, and the spherical radius is equal to R0 , another spherical radius is R1. The lens diameter depends on the incident spot size.

[0034] like Image 6 As shown, taking circular parallel or near-parallel light incidence as an example, D is the total diameter of the focused spot, and BFL1 and BFL2 correspond to the back focal length formed by spherical radius R1, lens thickness, and refractive index in the corresponding assembly mode. Wherein, the focus spot diameter D is proportional to the radius R1 of the spherical surface and the width T of the ring zone, and inversely proportional to the radius of the spherical surface of the ring zone 3, and the theoretical proportional coefficient is about 1. like Figure 8 It can be seen that the total diamet...

Embodiment 2

[0036] Since the lens can be assembled front and back, such as Figure 7 As shown, taking circular parallel or near-parallel light incidence as an example, D is the total diameter of the focused spot, and BFL1 and BFL2 correspond to the back focal length formed by spherical radius R1, lens thickness, and refractive index in the corresponding assembly mode. Wherein, the focus spot diameter D is proportional to the radius R1 of the spherical surface and the width T of the ring zone, and inversely proportional to the radius of the spherical surface of the ring zone 3, and the theoretical proportional coefficient is about 1. Depend on Figure 9 The total spot diameter of any cross-section in the focal depth section of the visible lens is D1, and D1 increases with the increase of the defocus distance, and the actual available high power density distribution spot diameter d is basically unchanged. In the focal depth range, there is little difference in the peak power density of the...

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Abstract

The invention discloses a novel optical lens acquiring long focal depth Bessel gauss light beams through focusing. The novel optical lens comprises a multi-zone curved surface and a focusing curved surface, wherein the multi-ring curved surface and the focusing curved surface are coaxially superposed, the multi-ring curved surface is provided with rings in a concentric-circle structure, surfaces of the rings are spherical surfaces or aspheric surfaces, ring-shaped optical axes are arranged among the adjacent rings, and the focusing curved surface is a spherical surface or an aspheric surface. The single lens is employed for focusing, so the Bessel gauss light beams are acquired, the energy distribution density at the center scope is quite high, quite-low focusing light beam segments are distributed at the edge, the power density scope is high, light spots are quite small, the focal depth is quite long, and light spot peak value power densities in the focal depth segment are similar. According to the novel optical lens, assembly precision requirements of the lens are common, the lens has relatively wide universality for laser beam modes, the fine laser processing technology can be improved and ameliorated, especially for the cutting technology of transparent materials.

Description

technical field [0001] The invention relates to the field of optical equipment, in particular to a novel optical lens for focusing and obtaining a long-focus deep Bessel Gaussian beam. Background technique [0002] Laser processing technology uses the characteristics of the interaction between laser and matter to carry out laser cutting, welding, surface treatment, drilling, micro-processing, etc., among which laser cutting, drilling, micro-processing and other processes have relatively high requirements for the characteristics of the focused laser beam . Under the same laser power, it is often necessary to have a small focal spot, a long depth of focus, and a high peak power density at the same time, in order to maximize the processing speed and quality. [0003] Nowadays, laser cutting occupies more than half of the laser processing technology market and has become the mainstream. Most laser cutting optical paths use lens combinations with better optical performance or ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00G02B3/10
CPCG02B3/00G02B3/10G02B2003/0093
Inventor 邵华江李思佳李思泉
Owner SHANGHAI EMPOWER AUTOMATION TECH CO LTD
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