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Method for improving aberration characteristic of self-focusing lens

A self-focusing lens, a new method of technology, applied in the direction of lens, optics, instrument, etc.

Inactive Publication Date: 2006-06-21
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the use of annealing heat treatment method to improve the refractive index distribution of the self-focusing lens

Method used

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  • Method for improving aberration characteristic of self-focusing lens
  • Method for improving aberration characteristic of self-focusing lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: see figure 1 , the refractive index distribution of the self-focusing lens glass fiber sample 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 was negative spherical aberration, barrel distortion, and the refractive index of the edge The distribution is higher than the ideal refractive index distribution.

[0020] The method of annealing in a heat treatment furnace is adopted; first, the self-focusing lens glass filament taken out of the ion exchange furnace is put into the heat treatment furnace, and the temperature is raised at a rate of 150 ° C per hour, and the temperature is raised to 320 ° C in 2 hours. The temperature is raised at a rate of 40°C per hour, and the temperature is raised to 530°C in 5 hours and 10 minutes. After constant temperature for 1 hour, the furnace temperature is lowered from 530°C to 300...

Embodiment 2

[0021] Example 2: see figure 1 and figure 2 , the refractive index distribution of the self-focusing lens glass fiber 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 was negative spherical aberration, barrel distortion, and the edge The refractive index profile is higher than the ideal refractive index profile. In order to improve the refractive index distribution at the edge, it is necessary to reduce the refractive index at the edge of the glass filament of the self-focusing lens to make it closer to the ideal refractive index distribution.

[0022] The annealing treatment is carried out in ion exchange. The process is: after the self-focusing lens glass filament is taken out of the molten salt, it is placed in an empty crucible in the exchange furnace, and then kept at an ion exchange temperature of 530°C for 2 hour...

Embodiment 3

[0023] Embodiment 3: Annealing treatment is performed on the self-focusing lens glass fiber sample NO 02, and the process conditions are the same as those in Embodiment 1. The refractive index distribution was measured by thin-section interferometry, and the refractive index distribution and aberration characteristics of the processed self-focusing lens glass fiber sample NO 02 were measured. The measurement results showed that the barrel distortion was reduced from 0.160 to 0.049, and the longitudinal spherical aberration From the original 0.210 to 0.175 (see Table 1), the refractive index distribution and aberration characteristics at the edge of the self-focusing lens are obviously improved.

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Abstract

The invention discloses a new improvement method of self-focal lens optical aberration character, which comprises the following steps: measuring the refractive index distribution of self-focal lens glass yarn through film interferometric method to obtain different position of the refractive index value and refractive index distribution curve from the center to edge; comparing the obtained curve with the ideal refractive index distribution curve to affirm the biased degree; proceeding the annealing disposal in the heat treatment stove or ion exchanging stove; proceeding the second annealing disposal or adapting second ion exchanging disposal if the optical aberration character is not ideal.

Description

technical field [0001] The invention relates to micro optics, optical fiber communication and optical information processing, in particular to a new method for improving the aberration characteristics of the 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 2501p / mm), small exit spot (can be less than 1μm), good aberration performance, etc., and has good collimation, convergence, beam expansion, 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 made...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/00
Inventor 刘德森郎贤礼蒋小平刘晓东周自刚
Owner SOUTHWEST UNIVERSITY
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