Effect of amplitude freedom on imaging of diffractive optical elements

MENG Nini; QIAN Xiaofan; LIU Bin; LI Xinying; ZHANG Yaping

doi:10.7510/jgjs.issn.1001-3806.2019.06.023

LASER TECHNOLOGY > 2019 > 43(6): 855-862. > DOI: 10.7510/jgjs.issn.1001-3806.2019.06.023

MENG Nini, QIAN Xiaofan, LIU Bin, LI Xinying, ZHANG Yaping. Effect of amplitude freedom on imaging of diffractive optical elements[J]. LASER TECHNOLOGY, 2019, 43(6): 855-862. DOI: 10.7510/jgjs.issn.1001-3806.2019.06.023

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Effect of amplitude freedom on imaging of diffractive optical elements

Laser Institute, Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China

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Received Date: December 13, 2018
Revised Date: April 27, 2019
Published Date: November 24, 2019

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Abstract

In order to improve the uniformity of intensity distribution of the reconstructed images and improve the imaging quality in the design of the diffractive optical elements, the design algorithm is optimized by adding a mixed amplitude degree of freedom to the target image due to the fact that there must be leakage in the light field propagation process, and the effectiveness of the method was verified by designing a Fourier transform type diffractive optical element. The simulation results show that, compared without amplitude degree of freedom, the reconstructed image's intensity uniformity of the elements designed by this method is reduced from about 14% to less than 1%, and the mean square error is reduced from about 10% to less than 0.1%, and the method is applicable to both Gerchberg & Saxton(GS) algorithm and simulated annealing algorithm.
- diffraction,
- diffractive optical element,
- amplitude degree of freedom,
- uniformity

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