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A method of making an aspheric surface

A technology of aspheric surface and aspheric lens, applied in the direction of manufacturing tools, instruments, laser welding equipment, etc., can solve problems such as high risk, complicated processing technology, and high degree of difficulty

Active Publication Date: 2019-04-09
FUZHOU PHOTOP QPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing technology is complicated, the degree of difficulty is high, and the risk of chemical corrosion and hydrogen-oxygen flame high-temperature repair is high, and it is not easy to operate
[0003] Especially, for the cylindrical surface with large LD divergence angle, such as θ = ±45°, it is difficult to achieve the ideal collimation effect

Method used

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  • A method of making an aspheric surface
  • A method of making an aspheric surface
  • A method of making an aspheric surface

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 1 As shown, a method for making an aspheric surface uses a femtosecond laser 2 to irradiate an optical flat sheet 1 with femtosecond laser, and adjusts the energy density or beam waist diameter, irradiation trajectory and running speed of the femtosecond laser to make The refractive index distribution of the optical flat sheet changes, and the △n*H (optical path) changes in different regions are realized through the thickness H of the optical flat sheet and the femtosecond laser irradiation, so that the effect of the optical flat sheet 1 combined with the ordinary lens reaches Such as image 3 The aspheric effect of the aspheric lens in the prior art is shown, wherein the femtosecond laser irradiation trajectory of the optical flat plate 1 located on the end face of the same side is concentric along the central position of the irradiated end face and gradually progresses toward the edge of the irradiated end face Continuous femtosecond laser irradiation,...

Embodiment 2

[0022] Such as Figure 4 As shown, in this embodiment, the method for producing an aspheric surface in Example 1 is applied to the production of a three-piece structure composite aspheric lens, which includes a first lens 1 and an optical flat plate 2 arranged in sequence along the propagation direction of the optical path. and the second lens 3, the optical flat sheet 2 is irradiated with femtosecond laser by a femtosecond laser, so that the refractive index distribution of the optical flat sheet 2 is changed, so that the first lens 1, the optical flat sheet 2 and the second lens 3 are formed The three-piece composite lens achieves the effect of an aspheric lens.

Embodiment 3

[0024] Such as Figure 5 As shown, in this embodiment, the method for producing an aspheric surface in Example 1 is applied to the production of an aspheric cylindrical lens, which includes a first lens 1, an optical flat plate 2 and a second lens arranged in sequence along the propagation direction of the optical path 3. Femtosecond laser irradiation is performed on the optical flat sheet 2 by a femtosecond laser, so that the refractive index distribution of the optical flat sheet 2 is changed, and it is made into a long strip-shaped cylindrical surface compensation sheet, which changes the traditional cylindrical surface that is difficult to obtain ideal, The defects of the collimated optical effect make the first lens 1, the optical flat plate 2 and the second lens 3 constitute an aspheric cylindrical lens, which is used for cylindrical compensation with a large divergence angle of LD, that is, θ=±45°, which can be Get the desired effect.

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Abstract

The invention discloses a method for manufacturing an aspheric surface. The method comprises the following steps: optical plain glass is irradiated by using femtosecond laser; the refractive index distribution of the glass is changed by adjusting the energy density, the irradiation track, the running speed and other conditions of the laser; refractive index changes of different areas are achievedby adjusting the thickness of an optical plain film and the action time and action track of the femtosecond laser, so that a composite lens achieves the aspheric effect, meanwhile, the optical plain film glass cannot be damaged, follow-up processing of relevant methods such as chemistry or physics is not needed, and simplicity, convenience and rapidness are achieved.

Description

technical field [0001] The invention relates to the technical field of making optical elements, in particular to a method for making an aspheric surface. Background technique [0002] In the prior art, aspherical surfaces are generally produced by using traditional processing methods or precision lathes, which is not only difficult, but also has low production efficiency and product yield. At present, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, He Fei, Cheng Ya, Lin Jintian, Xu Zhizhan and others proposed a "method for preparing micro-optical components on quartz glass substrates using femtosecond laser", which uses femtosecond laser irradiation The three-step method of chemical corrosion and hydrogen-oxygen flame polishing can realize the processing of any surface shape such as aspheric, flat, and standard spherical surfaces; hydrogen-oxygen flame polishing produces only water, which is environmentally friendly and fast in polishing speed, ...

Claims

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Application Information

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IPC IPC(8): B23K26/00G02B3/02
CPCG02B3/02B23K26/00
Inventor 吴砺林磊张建英
Owner FUZHOU PHOTOP QPTICS CO LTD
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