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Method for improving refractive index distribution of self-focusing lens

A technology of refractive index distribution and self-focusing lens, which is applied in the field of improving the refractive index distribution of self-focusing lens, and can solve the problems of large aberration of self-focusing lens, large exit spot size, and affecting the quality of self-focusing lens.

Inactive Publication Date: 2007-10-03
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In both cases, the aberration of the self-focusing lens is large, the size of the exit spot is also large, and the spot is very irregular, which seriously affects the quality of the self-focusing lens and its application in the optical system.

Method used

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  • Method for improving refractive index distribution of self-focusing lens
  • Method for improving refractive index distribution of self-focusing lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Referring to Figure 1, the refractive index distribution of the self-focusing lens sample NO 01 after the first ion exchange was measured by thin-section interferometry, and the distortion and spherical aberration of the sample were measured. The measurement result shows that the sample is negative spherical aberration and barrel-shaped Distortion, the refractive index distribution of its edge is higher than the ideal refractive index distribution. In order to improve the refractive index distribution at the edge, the purpose of the second ion exchange treatment is to reduce the refractive index at the edge of the self-focusing lens to make it closer to the ideal refractive index distribution. Therefore, in the secondary ion exchange, the molten salt used is a mixed salt of 3% NaNO3 and 97% KNO3, and the ion exchange temperature is 530°C±0.5°C. In order to only correct the refractive index distribution at the edge of the lens, the secondary ion exchange The t...

Embodiment 2

[0021] Example 2: Except that the secondary ion exchange time was changed to 25 minutes, the others were the same as in Example 1. For the self-focusing lens sample NO 02 after the secondary ion exchange, the refractive index distribution and aberration characteristics were measured, and the measurement The results show that the barrel distortion is reduced from the original 0.160 to 0.073, and the longitudinal spherical aberration is reduced from the original 0.210 to 0.190, which obviously improves the refractive index distribution and aberration characteristics of the edge of the self-focusing lens.

Embodiment 3

[0022] Example 3: The refractive index distribution of the self-focusing lens sample NO 01 after the first ion exchange was measured by thin-section interferometry, and the distortion and spherical aberration of the sample were measured. The measurement results showed that the sample had negative spherical aberration, barrel distortion, and its edge The refractive index profile of the part is higher than the ideal refractive index profile. In order to improve the refractive index distribution at the edge, the purpose of the second ion exchange treatment is to reduce the refractive index at the edge of the self-focusing lens to make it closer to the ideal refractive index distribution. Therefore, in the secondary ion exchange, the molten salt used is 2% NaNO 3 with 98% KNO 3 The mixed salt, the ion exchange temperature is 530°C±0.5°C, in order to only correct the refractive index distribution at the edge of the lens, the secondary ion exchange time is 30 minutes. For the two ...

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Abstract

The invention discloses a new improvement method of self-focal lens refractive index distribution, which comprises the following steps: cutting the once ion exchanging glass yarn into transverse film sample; measuring the sample on the sand-sensitive interferometer through film interferometric method to obtain the refractive index value and refractive index distribution curve; adapting the mixing salt of 3%-6% NaNO3 and 97%-94%KNO3 as fused salt of second ion exchanging when the measured curve is higher than the ideal refractive index distribution curve, negative-ball difference and barrel distortion; utilizing mixing salt of 3%-6%Tl2SO4 and 97%-94%KNO3 as fused salt of second ion exchanging when the measured curve is lower than the ideal refractive index distribution curve, positive-ball difference and pillow distortion; controlling the ion exchanging temperature at 530+ / -0.5 deg.c and the time within 20-30 min; proceeding heat treatment after second ion exchanging. The invention can change the refractive index distribution to approach the ideal refractive index distribution, which improves the optical aberration and self-focal lens quality.

Description

technical field [0001] The invention relates to micro optics, optical fiber communication and optical information processing, in particular to a method for improving the refractive index distribution of a self-focusing lens. Background technique [0002] The self-focusing lens, that is, the radially variable refractive index lens, is a very important micro-optical basic element in the field of optical information. It has a small diameter (can be less than 1mm), a short focal length (the focus can be located on the end surface), and a large numerical aperture ( Can be greater than 0.6), high imaging resolution (can be greater than 250lp / mm), small exit spot (can be less than 1μm), good aberration performance, etc., and has good collimation, convergence, beam expansion, and Transformation and multiple imaging capabilities are widely used in optical fiber communication, optical fiber sensing, optical information processing and other fields. Self-focusing lenses are usually mad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00
Inventor 刘德森郎贤礼周自刚蒋小平刘晓东
Owner SOUTHWEST UNIV
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