Research of laser speckle suppression method based on fiber vibration

WANG Jing; HE Fengtao; CAO Jinfeng; ZHU Yuhan; ZUO Bo

doi:10.7510/jgjs.issn.1001-3806.2015.05.017

In order to eliminate the speckle in laser microscopic imaging system, effect of optical fiber vibration on microscopic speckle images was studied by comparing the speckle dark ratio. In this experiment, with laser at 532nm wavelength as light source of the microscopic system, with the optical fiber vibration to eliminate the image speckle and a CCD image sensor acquisition system to collect the microscopic images of the sample surface, images dark ratios were analyzed at different vibration voltages. The results show that with the increase of the vibration voltage, the speckle dark ratio of the images will reduce gradually. When the voltage is 2.6V, the image speckle dark ratio can reach 5.64%, speckle contrast is 4.17% close to human eye resolution of 4%. This method can achieve good speckle elimination effect.

Research of laser speckle suppression method based on fiber vibration

Corresponding author: HE Fengtao, hefengtao@xupt.edu.cn;

1. School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710061, China

Received Date: 2014-08-01

Accepted Date: 2014-09-09

Available Online: 2015-09-25

Abstract: In order to eliminate the speckle in laser microscopic imaging system, effect of optical fiber vibration on microscopic speckle images was studied by comparing the speckle dark ratio. In this experiment, with laser at 532nm wavelength as light source of the microscopic system, with the optical fiber vibration to eliminate the image speckle and a CCD image sensor acquisition system to collect the microscopic images of the sample surface, images dark ratios were analyzed at different vibration voltages. The results show that with the increase of the vibration voltage, the speckle dark ratio of the images will reduce gradually. When the voltage is 2.6V, the image speckle dark ratio can reach 5.64%, speckle contrast is 4.17% close to human eye resolution of 4%. This method can achieve good speckle elimination effect.

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Reference (15)

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Research of laser speckle suppression method based on fiber vibration

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